Dr Yanju Liu

Dr Yanju Liu

Research Fellow

Global Centre for Environmental Remediation

Career Summary

Biography

In 2009, I graduated from Wuhan University of Technology with a Master degree on mineral processing and engineering and Bachelor degree on environmental science with 3 years research experience on hydrometallurgy of low grade phosphate ore from a reuse and recycling perspective.

After joining the University of South Australia in 2009 as PhD student, I was working on the utilization of another industrial waste – red mud for its valorisation as an adsorbent for pollutants removal. The main focus of my research is valorisation of red mud on its utilization as adsorbent and extraction of valuable metals by pyrometallurgy and hydrometallurgy processes since working in University of South Australia in 2013. I am also working on investigating the bioavailability of priority contaminants in contaminated soil, such as Pb, PAHs and incorporating bioavailability in risk assessment process.

After joining in University of Newcastle in 2015, the research project on valorisation of red mud will continue as well as further investigation on bioavailability, interaction with nanoparticles, fate and behaviour of priority and emerging environmental contaminations will be conducted.

Research Expertise
Dr Liu is an early career researcher with a background in environmental science and remediation.

Qualifications

  • PhD, University of South Australia

Keywords

  • Environmental contaminations
  • Nanoparticles
  • Red mud utilization
  • Risk assessment

Fields of Research

Code Description Percentage
039901 Environmental Chemistry (incl. Atmospheric Chemistry) 30
050299 Environmental Science and Management not elsewhere classified 20
050304 Soil Chemistry (excl. Carbon Sequestration Science) 50

Professional Experience

UON Appointment

Title Organisation / Department
Research Fellow University of Newcastle
Global Centre for Environmental Remediation
Australia
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Journal article (32 outputs)

Year Citation Altmetrics Link
2018 Wang Z, Tan X, Lu G, Liu Y, Naidu R, He W, 'Soil properties influence kinetics of soil acid phosphatase in response to arsenic toxicity', Ecotoxicology and Environmental Safety, 147 266-274 (2018)

© 2017 Elsevier Inc. Soil phosphatase, which plays an important role in phosphorus cycling, is strongly inhibited by Arsenic (As). However, the inhibition mechanism in kinetics i... [more]

© 2017 Elsevier Inc. Soil phosphatase, which plays an important role in phosphorus cycling, is strongly inhibited by Arsenic (As). However, the inhibition mechanism in kinetics is not adequately investigated. In this study, we investigated the kinetic characteristics of soil acid phosphatase (ACP) in 14 soils with varied properties, and also explored how kinetic properties of soil ACP changed with different spiked As concentrations. The results showed that the Michaelis constant (K m ) and maximum reaction velocity (V max ) values of soil ACP ranged from 1.18 to 3.77 mM and 0.025¿0.133 mM h -1 in uncontaminated soils. The kinetic parameters of soil ACP in different soils changed differently with As contamination. The K m remained unchanged and V max decreased with increase of As concentration in most acid and neutral soils, indicating a noncompetitive inhibition mechanism. However, in alkaline soils, the K m increased linearly and V max decreased with increase of As concentration, indicating a mixed inhibition mechanism that include competitive and noncompetitive. The competitive inhibition constant (K ic ) and noncompetitive inhibition constant (K iu ) varied among soils and ranged from 0.38 to 3.65 mM and 0.84¿7.43 mM respectively. The inhibitory effect of A s on soil ACP was mostly affected by soil organic matter and cation exchange capacity. Those factors influenced the combination of As with enzyme, which resulted in a difference of As toxicity to soil ACP. Catalytic efficiency (V max /K m ) of soil ACP was a sensitive kinetic parameter to assess the ecological risks of soil As contamination.

DOI 10.1016/j.ecoenv.2017.08.050
Co-authors Ravi Naidu
2017 Tan X, Liu Y, Yan K, Wang Z, Lu G, He Y, He W, 'Differences in the response of soil dehydrogenase activity to Cd contamination are determined by the different substrates used for its determination', CHEMOSPHERE, 169 324-332 (2017) [C1]
DOI 10.1016/j.chemosphere.2016.11.076
Citations Scopus - 4Web of Science - 3
2017 Yan K, Dong Z, Wijayawardena MAA, Liu Y, Naidu R, Semple K, 'Measurement of soil lead bioavailability and influence of soil types and properties: A review', CHEMOSPHERE, 184 27-42 (2017) [C1]
DOI 10.1016/j.chemosphere.2017.05.143
Co-authors Ravi Naidu, Ayanka Wijayawardena, Morrow Dong
2017 Dong Z, Bahar MM, Jit J, Kennedy B, Priestly B, Ng J, et al., 'Issues raised by the reference doses for perfluorooctane sulfonate and perfluorooctanoic acid', ENVIRONMENT INTERNATIONAL, 105 86-94 (2017) [C1]
DOI 10.1016/j.envint.2017.05.006
Co-authors Luchun Duan, Ravi Naidu, Mezbaul Bahar, Morrow Dong, Dane Lamb
2017 Liu Y, Bello O, Rahman MM, Dong Z, Islam S, Naidu R, 'Investigating the relationship between lead speciation and bioaccessibility of mining impacted soils and dusts', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 24 17056-17067 (2017) [C1]
DOI 10.1007/s11356-017-9250-8
Co-authors Mahmud Rahman, Morrow Dong, Ravi Naidu
2017 Qi F, Yan Y, Lamb D, Naidu R, Bolan NS, Liu Y, et al., 'Thermal stability of biochar and its effects on cadmium sorption capacity.', Bioresour Technol, (2017)
DOI 10.1016/j.biortech.2017.07.033
Co-authors Nanthi Bolan, Scott Donne, Dane Lamb, Ravi Naidu
2016 Naidu R, Arias V, Liu Y, Jit J, 'Emerging contaminants in the environment: Risk-based analysis for better management', Chemosphere, 154 350-357 (2016) [C1]
DOI 10.1016/j.chemosphere.2016.03.068
Citations Scopus - 15Web of Science - 12
Co-authors Ravi Naidu, Victor Arias
2016 Dong Z, Yan K, Liu Y, Naidu R, Duan L, Wijayawardena A, et al., 'A meta-analysis to correlate lead bioavailability and bioaccessibility and predict lead bioavailability', Environment International, 92-93 139-145 (2016) [C1]
DOI 10.1016/j.envint.2016.04.009
Citations Scopus - 1Web of Science - 1
Co-authors Ravi Naidu, Ayanka Wijayawardena, Mahmud Rahman, Luchun Duan, Morrow Dong
2016 Dong Z, Liu CX, Liu Y, Yan K, Semple KT, Naidu R, 'Using publicly available data, a physiologically-based pharmacokinetic model and Bayesian simulation to improve arsenic non-cancer dose-response', Environment International, 92-93 239-246 (2016) [C1]

© 2016 Elsevier Ltd. Publicly available data can potentially examine the relationship between environmental exposure and public health, however, it has not yet been widely applie... [more]

© 2016 Elsevier Ltd. Publicly available data can potentially examine the relationship between environmental exposure and public health, however, it has not yet been widely applied. Arsenic is of environmental concern, and previous studies mathematically parameterized exposure duration to create a link between duration of exposure and increase in risk. However, since the dose metric emerging from exposure duration is not a linear or explicit variable, it is difficult to address the effects of exposure duration simply by using mathematical functions. To relate cumulative dose metric to public health requires a lifetime physiologically-based pharmacokinetic (PBPK) model, yet this model is not available at a population level. In this study, the data from the U.S. total diet study (TDS, 2006-2011) was employed to assess exposure: daily dietary intakes for total arsenic (tAs) and inorganic arsenic (iAs) were estimated to be 0.15 and 0.028 µg/kg/day, respectively. Meanwhile, using National Health and Nutrition Examination Survey (NHANES, 2011-2012) data, the fraction of urinary As(III) levels (geometric mean: 0.31 µg/L) in tAs (geometric mean: 7.75 µg/L) was firstly reported to be approximately 4%. Together with Bayesian technique, the assessed exposure and urinary As(III) concentration were input to successfully optimize a lifetime population PBPK model. Finally, this optimized PBPK model was used to derive an oral reference dose (Rfd) of 0.8 µg/kg/day for iAs exposure. Our study also suggests the previous approach (by using mathematical functions to account for exposure duration) may result in a conservative Rfd estimation.

DOI 10.1016/j.envint.2016.03.035
Co-authors Ravi Naidu, Morrow Dong
2016 Bello O, Naidu R, Rahman MM, Liu Y, Dong Z, 'Lead concentration in the blood of the general population living near a lead-zinc mine site, Nigeria: Exposure pathways', Science of the Total Environment, 542 908-914 (2016) [C1]

© 2015. Lead (Pb) poisoning in children is a major public health catastrophe worldwide. This report summarises both exposure pathways and blood Pb levels in children below 7. yea... [more]

© 2015. Lead (Pb) poisoning in children is a major public health catastrophe worldwide. This report summarises both exposure pathways and blood Pb levels in children below 7. years of age and adults (above 18. years) from the Adudu community living near a lead-zinc mine in Nasawara, Nigeria. The average and median blood Pb levels in children and adults were 2.1 and 1.3 µg/dL, 3.1 and 1.8 µg/dL, respectively. However, Pb in 14% of adults' blood exceeded 5. µg/dL, which is the recommended threshold blood Pb concentration in adults as established by the Centers for Disease Control and Prevention (CDC). Furthermore 68% of adults' blood exceeded blood Pb action level of 2 µg/dL. For children, 11.4% and 31% of the blood samples exceeded 5 µg/dL and 2 µg/dL, respectively, while no safe blood Pb level in children has been recommended. In Nasawara, a significant difference (p < 0.05) was observed between the various age groups in chi ldren with 2-4 years old having the highest levels and 6. year old children having the lowest Pb levels. Although this study did not detect elevated levels of Pb in children's blood in regions such as Zamfara, Nigeria and Kabwe, Zambia, a high percentage of samples exceeded 2 µg/dL. Soils, floor dusts, water and crops also reveal that Pb contamination in the study area could potentially be the major cause of blood Pb in the community exposed to mining. This study also observed a significant correlation between water Pb levels of adults and blood Pb levels, suggesting that water is the major exposure pathway. This analysis highlights the need to properly manage mining activities so that the health of communities living in the vicinity of a Pb-Zn mine is not compromised.

DOI 10.1016/j.scitotenv.2015.10.143
Citations Scopus - 4Web of Science - 4
Co-authors Mahmud Rahman, Morrow Dong, Ravi Naidu
2016 Rusmin R, Sarkar B, Biswas B, Churchman J, Liu Y, Naidu R, 'Structural, electrokinetic and surface properties of activated palygorskite for environmental application', Applied Clay Science, 134 95-102 (2016) [C1]

© 2016 Elsevier B.V. Unlike smectite, the surface characteristics of palygorskite remain underexplored for its potential application in environmental remediation. In this study, ... [more]

© 2016 Elsevier B.V. Unlike smectite, the surface characteristics of palygorskite remain underexplored for its potential application in environmental remediation. In this study, palygorskite from Western Australia was activated through thermal (300 °C for 4 h), acid (4 M HCl for 2 h at 70 °C) and acid-thermal (acid treatment followed by heating at 300 °C for 4 h) treatments, and the structural and physico-chemical characteristics were examined against the raw clay mineral. The influence of activation was systematically investigated using X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR) spectroscopy, N 2 adsorption-desorption measurements and solid state 27 Al Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) spectroscopy. The XRD patterns indicated preservation of the crystalline structure of palygorskite following all the treatments. These findings were supported by the Al (IV) and Al (VI) coordination peaks (chemical shift ~ 55 and 2.9 ppm, respectively) which were unaltered in the 27 Al MAS NMR spectra of the samples. The acid-thermal activated palygorskite exhibited the highest specific surface area (152.7 m 2 g - 1 ) and pore volume (0.2137 cm 3 g - 1 ) which respectively were 3-fold and 69% greater than the raw palygorskite. The potentiometric titration analyses highlighted the possible role of Al derivatives towards development of the surface charge of the activated palygorskites. Electrokinetic studies described the stability of the activated products (zeta potential values ranging from - 5 mV to - 32 mV) at different electrolyte (NaNO 3 ) concentrations. Combined acid-thermal activated palygorskite displayed a stronger specific adsorption of multivalent cations, and held a direct relevance to environmental remediation. Findings of this study will assist in the development of palygorskite-based adsorbents for heavy metal contaminants remediation.

DOI 10.1016/j.clay.2016.07.012
Citations Scopus - 5Web of Science - 4
Co-authors Ravi Naidu
2016 Nuruzzaman M, Rahman MM, Liu Y, Naidu R, 'Nanoencapsulation, Nano-guard for Pesticides: A New Window for Safe Application', JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 64 1447-1483 (2016) [C1]
DOI 10.1021/acs.jafc.5b05214
Citations Scopus - 23Web of Science - 22
Co-authors Ravi Naidu, Mahmud Rahman
2016 Liu Y, Naidu R, Ming H, Dharmarajan R, Du J, 'Effects of thermal treatments on the characterisation and utilisation of red mud with sawdust additive', Waste Management and Research, 34 518-526 (2016) [C1]
DOI 10.1177/0734242X16634197
Co-authors Raja Dharmarajan, Ravi Naidu, Jianhua Du
2016 Yan K, Dong Z, Liu Y, Naidu R, 'Quantifying statistical relationships between commonly used in vitro models for estimating lead bioaccessibility', Environmental Science and Pollution Research, 23 6873-6882 (2016) [C1]

© 2015, Springer-Verlag Berlin Heidelberg. Bioaccessibility to assess potential risks resulting from exposure to Pb-contaminated soils is commonly estimated using various in vitr... [more]

© 2015, Springer-Verlag Berlin Heidelberg. Bioaccessibility to assess potential risks resulting from exposure to Pb-contaminated soils is commonly estimated using various in vitro methods. However, existing in vitro methods yield different results depending on the composition of the extractant as well as the contaminated soils. For this reason, the relationships between the five commonly used in vitro methods, the Relative Bioavailability Leaching Procedure (RBALP), the unified BioAccessibility Research Group Europe (BARGE) method (UBM), the Solubility Bioaccessibility Research Consortium assay (SBRC), a Physiologically Based Extraction Test (PBET), and the in vitro Digestion Model (RIVM) were quantified statistically using 10 soils from long-term Pb-contaminated mining and smelter sites located in Western Australia and South Australia. For all 10 soils, the measured Pb bioaccessibility regarding all in vitro methods varied from 1.9 to 106¿% for gastric phase, which is higher than that for intestinal phase: 0.2 ~ 78.6¿%. The variations in Pb bioaccessibility depend on the in vitro models being used, suggesting that the method chosen for bioaccessibility assessment must be validated against in vivo studies prior to use for predicting risk. Regression studies between RBALP and SRBC, RBALP and RIVM (0.06) (0.06¿g of soil in each tube, S:L ratios for gastric phase and intestinal phase are 1:375 and 1:958, respectively) showed that Pb bioaccessibility based on the three methods were comparable. Meanwhile, the slopes between RBALP and UBM, RBALP and RIVM (0.6) (0.6¿g soil in each tube, S:L ratios for gastric phase and intestinal phase are 1:37.5 and 1:96, respectively) were 1.21 and 1.02, respectively. The findings presented in this study could help standardize in vitro bioaccessibility measurements and provide a scientific basis for further relating Pb bioavailability and soil properties.

DOI 10.1007/s11356-015-5947-8
Citations Scopus - 1
Co-authors Morrow Dong, Ravi Naidu
2016 Duan L, Naidu R, Liu Y, Dong Z, Mallavarapu M, Herde P, et al., 'Comparison of oral bioavailability of benzo[a]pyrene in soils using rat and swine and the implications for human health risk assessment', Environment International, 94 95-102 (2016) [C1]

© 2016 Elsevier Ltd. Background: There are many uncertainties concerning variations in benzo[a]pyrene (B[a] P) soil guidelines protecting human health based on carcinogenic data ... [more]

© 2016 Elsevier Ltd. Background: There are many uncertainties concerning variations in benzo[a]pyrene (B[a] P) soil guidelines protecting human health based on carcinogenic data obtained in animal studies. Although swine is recognised as being much more representative of the human child in terms of body size, gut physiology and genetic profile the rat/mice model is commonly used in practice. Objectives: We compare B[a]P bioavailability using a rat model to that estimated in a swine model, to investigate the correlation between these two animal models. This may help reduce uncertainty in applying bioavailability to human health risk assessment. Methods: Twelve spiked soil samples and a spiked silica sand (reference material) were dosed to rats in parallel with a swine study. B[a] P bioavailability was estimated by the area under the plasma B[a]P concentration-time curve (AUC) and faecal excretion as well in the rats. Direct comparison between the two animal models was made for: firstly, relative bioavailability (RB) using AUC assay; and secondly, the two assays in the rat model. Results: Both AUC and faecal excretion assays showed linear dose-response for the reference material. However, absolute bioavailability was significantly higher when using faecal excretion assay (p < 0.001). In aged soils faecal excretion estimated based on solvent extraction was not accurate due to the form of non-extractable fraction through ageing. A significant correlation existed between the two models using RB for soil samples (RB rat = 0.26RB swine + 17.3, R 2 = 0.70, p < 0.001), despite the regression slope coefficient revealing that the rat model would underestimate RB by about one quarter compared to using swine. Conclusions: In the comparison employed in this study, an interspecies difference of four in RB using AUC assay was identified between the rat and swine models regarding pharmacokinetic differences, which supported the body weight scaling method recommended by US EPA. Future research should focus on the carcinogenic competency (pharmacodynamics) used in experiment animals and humans.

DOI 10.1016/j.envint.2016.04.041
Citations Scopus - 3Web of Science - 2
Co-authors Luchun Duan, Morrow Dong, Ravi Naidu, Megh Mallavarapu
2016 Ming H, Naidu R, Sarkar B, Lamb DT, Liu Y, Megharaj M, Sparks D, 'Competitive sorption of cadmium and zinc in contrasting soils', Geoderma, 268 60-68 (2016) [C1]

© 2016 Elsevier B.V. The sorption behavior of cadmium (Cd(II)) and zinc (Zn(II)) on two virgin soils with different pH levels was studied using single metal and competitive dual ... [more]

© 2016 Elsevier B.V. The sorption behavior of cadmium (Cd(II)) and zinc (Zn(II)) on two virgin soils with different pH levels was studied using single metal and competitive dual metal systems. In the single metal system, Zn exhibited a greater affinity for the alkaline soil, as indicated by the Langmuir constant (K L = 8.85 L/kg) compared with Cd (K L = 1.79 L/kg). However, much less sorption of both Zn (K L = 0.19 L/kg) and Cd (K L = 0.07 L/kg) was observed in the acidic soil. The competitive sorption data were modeled using two-metal Freundlich and Langmuir functions. The competition for metal sorption occurred in the alkaline soil only at a higher concentration of the competing metals, whereas the effect was significant even at lower concentrations in the acidic soil. The cumulative amount of both metals sorbed in the soil was similar to that of single metal systems in the studied concentration range, demonstrating that the number of sites available for sorption remained constant irrespective of the competition. This study indicated that Cd might be more mobile in a mixed-metal system than in a single-metal scenario and thus poses a serious ecotoxicological threat. This study is important for assessing the risks and developing management strategies for multiple heavy metal contaminated soils.

DOI 10.1016/j.geoderma.2016.01.021
Citations Scopus - 8Web of Science - 4
Co-authors Ravi Naidu, Dane Lamb, Megh Mallavarapu
2015 Duan L, Naidu R, Liu Y, Palanisami T, Dong Z, Mallavarapu M, Semple KT, 'Effect of ageing on benzo[a]pyrene extractability in contrasting soils', JOURNAL OF HAZARDOUS MATERIALS, 296 175-184 (2015)
DOI 10.1016/j.jhazmat.2015.04.050
Citations Scopus - 11Web of Science - 8
Co-authors Luchun Duan, Thava Palanisami, Megh Mallavarapu, Ravi Naidu, Morrow Dong
2015 Rusmin R, Sarkar B, Liu Y, McClure S, Naidu R, 'Structural evolution of chitosan-palygorskite composites and removal of aqueous lead by composite beads', Applied Surface Science, 353 363-375 (2015)
DOI 10.1016/j.apsusc.2015.06.124
Citations Scopus - 11Web of Science - 11
Co-authors Ravi Naidu
2015 Dong Z, Liu Y, Duan L, Bekele D, Naidu R, 'Uncertainties in human health risk assessment of environmental contaminants: A review and perspective', Environment International, 85 120-132 (2015) [C1]

© 2015 Elsevier Ltd. Addressing uncertainties in human health risk assessment is a critical issue when evaluating the effects of contaminants on public health. A range of uncerta... [more]

© 2015 Elsevier Ltd. Addressing uncertainties in human health risk assessment is a critical issue when evaluating the effects of contaminants on public health. A range of uncertainties exist through the source-to-outcome continuum, including exposure assessment, hazard and risk characterisation. While various strategies have been applied to characterising uncertainty, classical approaches largely rely on how to maximise the available resources. Expert judgement, defaults and tools for characterising quantitative uncertainty attempt to fill the gap between data and regulation requirements. The experiences of researching 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) illustrated uncertainty sources and how to maximise available information to determine uncertainties, and thereby provide an 'adequate' protection to contaminant exposure. As regulatory requirements and recurring issues increase, the assessment of complex scenarios involving a large number of chemicals requires more sophisticated tools. Recent advances in exposure and toxicology science provide a large data set for environmental contaminants and public health. In particular, biomonitoring information, in vitro data streams and computational toxicology are the crucial factors in the NexGen risk assessment, as well as uncertainties minimisation. Although in this review we cannot yet predict how the exposure science and modern toxicology will develop in the long-term, current techniques from emerging science can be integrated to improve decision-making.

DOI 10.1016/j.envint.2015.09.008
Citations Scopus - 9Web of Science - 9
Co-authors Ravi Naidu, Luchun Duan, Dawit Bekele, Morrow Dong
2014 Duan L, Palanisami T, Liu Y, Dong Z, Mallavarapu M, Kuchel T, et al., 'Effects of ageing and soil properties on the oral bioavailability of benzo[a]pyrene using a swine model', Environment International, 70 192-202 (2014)
DOI 10.1016/j.envint.2014.05.017
Citations Scopus - 24Web of Science - 20
Co-authors Ravi Naidu, Morrow Dong, Thava Palanisami, Luchun Duan, Megh Mallavarapu
2014 Liu Y, Naidu R, 'Hidden values in bauxite residue (red mud): Recovery of metals', WASTE MANAGEMENT, 34 2662-2673 (2014)
DOI 10.1016/j.wasman.2014.09.003
Citations Scopus - 37Web of Science - 40
Co-authors Ravi Naidu
2013 Liu Y, Naidu R, Ming H, 'Surface electrochemical properties of red mud (bauxite residue): Zeta potential and surface charge density', JOURNAL OF COLLOID AND INTERFACE SCIENCE, 394 451-457 (2013) [C1]
DOI 10.1016/j.jcis.2012.11.052
Citations Scopus - 16Web of Science - 16
Co-authors Ravi Naidu
2011 Liu Y, Naidu R, Ming H, 'Red mud as an amendment for pollutants in solid and liquid phases', GEODERMA, 163 1-12 (2011)
DOI 10.1016/j.geoderma.2011.04.002
Citations Scopus - 75Web of Science - 70
Co-authors Ravi Naidu
2010 Liu YJ, Gong WQ, Zeng SJ, Liu J, Pi KW, Li YB, Hu F, 'Study of domestication of acidithiobacillus and effects on leaching of low grade phosphate ore', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 32 5-8 (2010)

Strains of Acidithiobacillus ferrooxidans (Atf) and Acidithiobacillus thiooxidans (Att) were isolated and purified from water samples collected from a hot spring in Guangxi provin... [more]

Strains of Acidithiobacillus ferrooxidans (Atf) and Acidithiobacillus thiooxidans (Att) were isolated and purified from water samples collected from a hot spring in Guangxi province. The purified Atf and Att were used in the leaching of a low grade phosphate ore. The results were compared with those obtained with Atf and Att after domestication. The results indicated that: 1) The activity of those domesticated Acidithiobacillus was enhanced, as the average pH value of Att was lower than the original ones and an obvious reduction of pH of the Atf which was domesticated by low grade phosphate ore with the concentration of 5~10 g/L was observed; 2) The domesticated Acidithiobacillus were easily adapted to the lixivium of phosphate ore with rapid decrease of pH value and high leaching rate at the 30th day of bioleaching. Particularly, the leaching rate was enhanced by up to 11%, with Att domesticated with both culture media with or without phosphate. The Atf domesticated with 2~8 g/L phosphate ore in culture media with phosphate increased the leaching rate by 28% at most. Meanwhile, the leaching rate of Atf domesticated with 10~15 g/L phosphate ore in culture media without phosphate was amolst 2 times of the original ones.

DOI 10.3963/j.issn.1671-4431.2010.03.002
2009 Zeng SJ, Gong WQ, Liu YJ, Liu J, Pi KW, Li YB, Hu F, 'Research on effects of ways of stirring on bacterial leaching of phosphate', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 31 (2009)

Difference ways of stirring, i.e. no-stirring, shaking, magnetic stirring and mechanical stirring, were employed in the bioleaching of phosphate in the ore. The leaching effects w... [more]

Difference ways of stirring, i.e. no-stirring, shaking, magnetic stirring and mechanical stirring, were employed in the bioleaching of phosphate in the ore. The leaching effects with different ways of stirring were analyzed and compared, revealing the factors responsible for the leaching of phosphorus element. The experimental results indicated that the leaching effects with magnetic stirring and mechanical stirring were obviously better than those with no-stirring and shaking and the leaching time was reduced significantly. The qualitative analysis using scanning electron microscope and energy dispersive spectroscopy showed that jarosite was one of the products of bacterial leaching and the major factor influencing the leaching effects.

DOI 10.3963/j.issn.1671-4431.2009.19.019
Citations Scopus - 1
2009 Liu YJ, Gong WQ, Zeng SJ, Liu J, Pi KW, Li YB, et al., 'Research on cultivation of acidithiobacillus strains by microwave mutagenesis for bioleaching of low-grade phosphate ore', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 31 16-19 (2009)

Microwave mutagenesis is an effective physical method to cultivate high quality microbial strains. In this article, continuous and discontinuous microwave mutagenesis methods are ... [more]

Microwave mutagenesis is an effective physical method to cultivate high quality microbial strains. In this article, continuous and discontinuous microwave mutagenesis methods are used to cultivate acidithiobacillus (At t and At f) strains. As a result, the optimized mutagenesis conditions for different acidithiobacillus strains are worked out. The effects of recycling the bacteria after bioleaching upon the activity of the bacteria and bioleaching rate of phosphate ore are investigated. The results indicate that both the bacteria activity and bioleaching rate of phosphate ore are enhanced significantly.

DOI 10.3963/j.issn.1671-4431.2009.24.005
Citations Scopus - 1
2008 Wang EW, Gong WQ, Shen QS, Liu J, Liu YJ, Zeng SJ, 'Effects of physical mutagenesis on leaching phosphorus with acidithiobacillus ferrooxidans', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 30 44-47 (2008)

Strains of acidithiobacillus ferrooxidans were separated and purified from water samples collected from a hot spring in Guangxi province. The purified At f was used in the leachin... [more]

Strains of acidithiobacillus ferrooxidans were separated and purified from water samples collected from a hot spring in Guangxi province. The purified At f was used in the leaching of a low grade phosphate ore. The results were compared with those obtained with At f after physical mutagenesis. The results indicated that: 1) the rate of phosphorus leached with purified At f was higher than that with unpurified At f, with the fifth purification being the best. 2) The oxidation activity and rate of phosphorus leached with At f after UV mutagenesis increased initially and then decreased as a function of mutagenesis time with an optimum occurred at 5 min. 3) The time for complete oxidation of Fe 2+ with At f, after ultrasonic mutagenesis was at lease 65 h shorter than that with At f, before ultrasonic mutagenesis and the rate of phosphorus leached increased by up to about 35%. 4) With low temperature mutagenesis the optimal results were obtained with At f after 1 h low temperature mutagenesis.

Citations Scopus - 1
2008 Shen QS, Gong WQ, Wang EW, Liu J, Liu YJ, Zeng SJ, 'Bioleaching of low-grade phosphate ore with microwave-mutated acidithiobacillus thiooxidans', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 30 29-32 (2008)

A strain of Acidithiobacillus thiooxidans (At t) isolated from a sulfur-containing hot spring in Guangxi was used to leach low-grade phosphate ore after being purified and cultiva... [more]

A strain of Acidithiobacillus thiooxidans (At t) isolated from a sulfur-containing hot spring in Guangxi was used to leach low-grade phosphate ore after being purified and cultivated. Then microwave mutagenesis study was carried out with the strain. The isolated and purified strain of At t had the capability of leaching low-grade phosphate ore, but the leaching-rate was low. Microwave could cause mutation of At t effectively and change its growth activity and acid-producing capacity. Strains treated for different mutagenesis time showed different bioleaching ability. The leaching-rate of the strain mutagenized with microwave for 10 s was the highest and reached 32.74% after bioleaching for 20 d, which increased almost 42% than that of the original At t strain.

Citations Scopus - 1
2007 Gong W, Zhang X, Yuan H, Liu Y, Bian X, Chen W, Liu J, 'Experimental Study on Bacterial Leaching of Low-Grade Phosphate Gangue', Journal of Shanghai Second Polytechnic University, 24 125-130 (2007)
2007 Gong WQ, Chen W, Zhang XZ, Bian X, Liu YJ, Liu J, et al., 'Isolation and cultivation of acidithiobacillus ferrooxidans and its effects on bioleaching of phosphate ore', Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering, 7 584-588 (2007)

A strain of Acidithiobacillus ferrooxidans that can be used effectively in the leaching of low grade phosphate ore was isolated from acid mine drainage from a coal mine in Anhui P... [more]

A strain of Acidithiobacillus ferrooxidans that can be used effectively in the leaching of low grade phosphate ore was isolated from acid mine drainage from a coal mine in Anhui Province in China. Its characteristics of morphology and growth were studied. Through the investigation of the effects of different solid culture medium components on the isolation and purification of Acidthiobacillus ferrooxidans, the optimum isolation conditions were determined as: the concentration of Fe 2+ in 9 K solid culture medium was 4.5 g/L. A double-layer plate, with heterotrophic microbe Rhodotorula sp. spreading onto the bottom layer and chemoautotrophic bacterium At.f spreading onto the upper layer, was used. The influential factors including culture media, energy source materials and the addition of surfactant on the leaching of phosphate ore with the cultivated At. f were studied. Through preliminary experiments, up to 48% of phosphate in the ore was leached out using the isolated At. f strain.

Citations Scopus - 5
2007 Gong WQ, Bian X, Chen W, Zhang XZ, Liu YJ, Liu J, et al., 'Cultivation characteristics of acidithiobacillus thiooxidans and bioleaching of low-grade phosphate ore with it', Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology, 29 53-57 (2007)

A strain of Acidithiobacillus thiooxidans (At. t) that can be used effectively in the leaching of low-grade phosphate ore was isolated from acid mine drainage from a coal mine in ... [more]

A strain of Acidithiobacillus thiooxidans (At. t) that can be used effectively in the leaching of low-grade phosphate ore was isolated from acid mine drainage from a coal mine in Anhui. Its characteristics of morphology and cultivation were studied. Through the investigation of the effect of different solid culture medium components on the isolation and purification of Acidthiobacillus thiooxidans, the optimum isolation conditions were determined by using a double-layer plate with chemoautotrophic bacterium At. t spread onto the upper Starkey solid culture medium layer, and heterotrophic microbe Rhodotorula sp. spread onto the bottom agar layer, resulting in significantly increased density and reduced forming time of the bacterial colony. The influence of factors including culture media and the addition of surfactant on the leaching of phosphate ore with the cultivated At. t was studied. Through preliminary experiments, up to 48.41% of phosphate in the ore was leached out by using the isolated At. t strain.

Citations Scopus - 3
2007 Gong WQ, Zhang XZ, Liu YJ, Chen W, Bian X, Liu J, et al., 'Influence of surfactants on leaching of phosphate ore with Acidithiobacillus thiooxidans', Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology), 38 60-64 (2007)

During the leaching of phosphate ore with sulfuric acid produced by the oxidation of reductive sulfur with Acidithiobacillus, different types of Tween surfactants were used to pro... [more]

During the leaching of phosphate ore with sulfuric acid produced by the oxidation of reductive sulfur with Acidithiobacillus, different types of Tween surfactants were used to promote the interaction between the bacteria and the ore and to increase the rate of phosphate leached. The effects of the surfactants on the phosphate ore leaching with Acidithiobacillus thiooxidans were evaluated by measuring the pH value of solution, the density of bacteria cell in solution and the rate of phosphate leached. The results show that Tween 20, 60 and 80 all can improve the leaching of the ore and the optimal dosages are 10, 10 and 100 g/m 3 , respectively. The effect of Tween 60 is the best with about 15% increase of the rate of phosphate leached with a dosage of 10 g/cm 3 .

Citations Scopus - 4
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Conference (1 outputs)

Year Citation Altmetrics Link
2007 Liu Y, Gong W, Jun L, Zeng S, 'The development of domestication and selective cultivation in the field of leaching phosphate microorganisms', 2007 National Chemical Science Annual Conference (2007)
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Grants and Funding

Summary

Number of grants 9
Total funding $1,227,805

Click on a grant title below to expand the full details for that specific grant.


20173 grants / $949,718

A fully integrated risk assessment system$860,918

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Yanju Liu, Doctor Luchun Duan, Doctor Ayanka Wijayawardena, Doctor Morrow Dong, Professor Ravi Naidu
Scheme Research Project
Role Lead
Funding Start 2017
Funding Finish 2018
GNo G1700897
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

Finucane Island and Nelson Point vapour modelling and site assessment$61,200

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Dawit Bekele, Professor Ravi Naidu, Doctor Yanju Liu, Doctor Mezbaul Bahar
Scheme Research Project
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1700831
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

Remediation Action Plan for OFTG, Nelson Point$27,600

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Mezbaul Bahar, Doctor Dawit Bekele, Doctor Yanju Liu, Dr Sreenivasulu Chadalavada, Dr Prashant Srivastava
Scheme Research Project
Role Investigator
Funding Start 2017
Funding Finish 2017
GNo G1700832
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

20165 grants / $270,587

Human Health Risk Assessment from Old Railway Sleepers - Port Hedland and Newman Mainline, WA$158,300

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Dawit Bekele, Professor Ravi Naidu, Doctor Morrow Dong, Doctor Yanju Liu, Doctor Jianhua Du, Doctor Mezbaul Bahar, Dr Prashant Srivastava
Scheme Research Project
Role Investigator
Funding Start 2016
Funding Finish 2016
GNo G1600616
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

Clean Up Toxic Metals From CCA Treated Timber$87,727

Funding body: CRC CARE Pty Ltd

Funding body CRC CARE Pty Ltd
Project Team Doctor Yanju Liu, Doctor Jianhua Du, Professor Ravi Naidu
Scheme Research Project
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1501554
Type Of Funding CRC - Cooperative Research Centre
Category 4CRC
UON Y

2016 International Visitor from Chinese Academy of Sciences, Beijing China$9,560

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Yanju Liu, Associate Professor Feng Xiao
Scheme International Research Visiting Fellowship
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1501005
Type Of Funding Internal
Category INTE
UON Y

The fractionation of PFOS/PFOA in different sizes of soil particles$7,500

Funding body: Faculty of Science and Information Technology, The University of Newcastle | Australia

Funding body Faculty of Science and Information Technology, The University of Newcastle | Australia
Project Team

Yanju Liu

Scheme New Staff Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Internal
Category INTE
UON N

Differentiate sorption behaviour of PFOA/PFOS on different soil components$7,500

Funding body: Faculty of Science and Information Technology, The University of Newcastle | Australia

Funding body Faculty of Science and Information Technology, The University of Newcastle | Australia
Project Team

Yanju Liu, Ravi Naidu, Cheng Fang, Luchun Duan

Scheme Faculty Small Grant Scheme
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Internal
Category INTE
UON N

20151 grants / $7,500

Survey of emerging contaminants in the Lake Macquarie $7,500

Funding body: Lake Macquarie City Council

Funding body Lake Macquarie City Council
Project Team Doctor Yanju Liu, Professor Ravi Naidu
Scheme Lake Macquarie Environmental Research Grant
Role Lead
Funding Start 2015
Funding Finish 2015
GNo G1600174
Type Of Funding Other Public Sector - Local
Category 2OPL
UON Y
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Research Supervision

Number of supervisions

Completed0
Current1

Total current UON EFTSL

PhD0.25

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2015 PhD Nanoencapsulated Pesticide: Insights Of Pesticide Loading To Enhance The Sustainability Of Nanocarriers PhD (Environment Remediation), Faculty of Science, The University of Newcastle Co-Supervisor
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Dr Yanju Liu

Position

Research Fellow
Global Centre for Environmental Remediation
Global Centre for Environmental Remediation
Faculty of Science

Contact Details

Email yanju.liu@newcastle.edu.au
Phone (02) 4913 8738

Office

Room ATC Building
Building Advanced Technology Centre.
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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