Dr Abinandan Sudharsanam

In the present study, we present a holistic approach to emphasize the importance of process conditions of In-situ transesterification to evaluate madhuca biodiesel sustainability. The current study proposes the utilization of Plackett¿Burman design followed by central composite design to maximize the biodiesel yield, exegy analysis and kinetics of biodiesel. The LCA analysis and energy spent on different techniques used in biodiesel synthesis were also studied. Screening of variables using Plackett¿Burman design was carried out to identify maximum oil yield following central composite design and exergy analysis. Plackett¿Burman screening design revealed seed weight, hexane volume, sulfuric acid, and temperature were the important variables (P < 0.05) influencing biodiesel yield. Gas chromatography analysis showed the dominance of oleic acid 36.95%, stearic acid 26.115%, linoleic acid 20.05%, and strong methylene peaks attributing to fatty acid methyl esters followed by FT-IR analysis. In addition, kinetic model with varying temperature on biodiesel production fitted first order equation at an R2 value of 98% with an activation energy of 19.16¿kJ¿mol-1. Thus, to compare influence of process variables on biodiesel yield following In-situ transesterification, based on experimental yield and material consumption, central composite design (CCD) and exergy analysis were used. The results from the analysis showed that both CCD and exergy analysis revealed 92¿95% biodiesel yield with significant change in process variables. The ANOVA results showed that all the variables in CCD model were significant with R2 97.37%, R-squared adjusted 94.55%, R-squared predicted value as 82.82%. Energy spent in biodiesel synthesis from seed to biodiesel for mechanical extraction (55.656¿kJ), solvent extraction (48.312¿kJ) and 19.8¿kJ for in-situ process (19.8¿kJ).The less energy spent for in-situ transesterification due to direct synthesis of biodiesel from seeds. Finally, life cycle assessment (LCA) was performed for these variables from CCD and exergy of madhuca biodiesel and compared with mechanical and solvent extraction presenting a holistic approach.

Priming of dwarf pea seeds with microalgal strains significantly enhanced plant growth Rhizosphere health also improved upon priming of seeds with microalgal strains Microalgae boost soil health, C/N content, EPS, IAA, and DHA in soils Plant growth and rhizosphere health improvements due to priming are soil-specific Microalgae play a key role as primary colonizers of soil, enhancing plant growth and improving soil health. Seed priming is a widely used method to improve seedling performance, counteract soil-related stresses, and boost plant productivity. Here we investigated the impact of priming dwarf pea seeds with live cells or disrupted cell mass of two microalgae, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, on plant growth response and rhizosphere health. Plant growth metrics, rhizosphere health parameters, and nutrient status indicators were investigated 21 days after sowing in two different soils (designated as A and B) with varying pH. Results revealed that priming significantly improved the biochemistry of rhizosphere in soil B (pH 8), with over 30% increases in leaf count and fresh weight compared to soil A (pH 6). While flowering rates remained low, priming with strain MAS1 significantly enhanced chlorophyll (20%), indole-3-acetic acid (61%), and dehydrogenase activity (50%). Furthermore, strain MAS1 boosted nutrient availability in the rhizosphere, with a 30%¿60% increase in carbon and nitrogen levels, promoting exopolysaccharide release. Our findings thus demonstrate the potential of seed priming with microalgae in modulating rhizosphere health, thereby enhancing plant growth and productivity.

Innovative approaches in sustainable wastewater management are vital in addressing climate change. This study introduces a novel assessment of solar-integrated ecotechnologies, focusing on the constructed wetland (CW) and microalgae-based systems, viz., high-rate algal pond (HRAP) and photobioreactor (PBR), for the treatment of winery wastewater. Utilizing Emergy analysis and life cycle assessment (LCA), we comprehensively compared these technologies in terms of environmental impact, resource recovery efficiency, and circular economy integration. Our Emergy analysis of the HRAP revealed a substantial reliance on renewable inputs (94%) and its lower nonrenewable resource consumption compared to the CW system. The Emergy sustainability index initially indicated a preference for the CW system (42.93 sej year-1; sej = solar emjoule), but deeper analysis showed greater sustainability in the HRAP (341 sej year-1) and PBR (118 sej year-1). LCA results further revealed that PBR systems had a significant land-use footprint, impacting other environmental indices such as photochemical ozone formation and freshwater eutrophication. Additionally, the HRAP and PBR demonstrated a marked reduction in greenhouse gas emissions (-24800 and -23700 kg of CO2-eq, respectively) compared to the CW system (320 kg of CO2-eq). Life cycle cost analysis underscored the economic viability of these systems, with Scenario 3 (PBR) emerging as the most economically sustainable, exhibiting the highest internal rate of return (IRR) at 21.11% and a positive net present value after 20 years. Conversely, Scenario 1 (CW system), with its significant initial investment of AU$741220, showed no IRR due to the absence of revenue generation. Importantly, our study introduces circularity index scores as a novel element, revealing that the HRAP and PBR effectively incorporate circularity measures across various impact categories. These measures had moderate impacts, as indicated by scores close to but not exceeding 0.10, whereas the CW system showed no significant improvement, highlighting the need for more robust circularity strategies. Overall, our integrated framework provides a holistic view of the environmental impact and economic aspects, emphasizing the potential of solar-integrated microalgal systems in promoting circular (bio)economy practices and sustainable environmental management in the viticulture sector.

Wine industry faces significant sustainability challenges in the wake of climate change. Life cycle assessments for carbon footprint in wineries suggest that the conventional farming exhibits higher values of 0.06¿3.0 kg CO2-eq bottle¿1 of 750 mL wine as compared to mixed and organic farming. Life cycle assessment findings highlight that most studies often overlooked the resources in farming practices, biogenic emissions, and wastewaters in the overall reduction of winery carbon footprint. We demonstrate that the adoption of eco-innovations such as constructed wetlands and Phycosol utilize the overlooked resource loop and significantly reduce the winery carbon footprint. Empirical data analysis suggests that the use of these eco-innovative models results in 25¿30% reduction of CO2 emissions bottle¿1 of 750 mL wine besides embracing Sustainable Development Goal 9, and effectively synergizing with Sustainable Development Goals 6 and 12, thus emphasizing their critical role in ensuring the sustainability of wine production.

The escalating challenges of resource scarcity and environmental degradation in agroecosystems necessitate innovative strategies for sustainable nutrient management. This review explores the integration of circular economy principles into nutrient recovery frameworks, emphasizing eco-innovative technologies that promote sustainability and resilience in agricultural practices. By examining various on-farm circularity practices and their efficacy in nutrient recovery, we highlight the potential of nature-inspired solutions such as constructed wetlands and algae-based systems to reduce environmental impacts and enhance nutrient use efficiency. The findings advocate for a paradigm shift towards advanced nutrient management strategies that leverage eco-innovation to reduce greenhouse gas emissions, optimize resource use, and align with global sustainability goals. The adoption of these strategies can significantly contribute to the sustainable transformation of the agricultural sector.

Residual microalgal biomass, a byproduct of various microalgae-based processes, represents an abundant and underutilized resource with significant potential for sustainable energy production, environmental applications, and bioproduct development. The cascading approach seeks to maximize resource efficiency and minimize waste by utilizing residual microalgal biomass in a stepwise manner to produce multiple value-added products. This review presents the current research status of residual microalgal biomass applications, focusing on energy, environmental, and bioproduct sectors. It highlights the challenges and complexities associated with cascading utilization of residual microalgal biomass and proposes strategies for managing uncertainty, optimizing the process and introduces a model exemplifying the practical application of this approach. The review aims to provide a comprehensive understanding of the potential of residual microalgal biomass as a valuable resource and to encourage further research in this field to promote a sustainable and circular bioeconomy.

Microalgae possess traits that make them thrive under extreme environmental conditions, and this fascinating adaptability recognizes them as novel candidates for wastewater treatment and bioresource management. In this study, we assessed two extremophilic (acid-tolerant) microalgal strains, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, for their ability to thrive in high-alkaline environments as existing in winery wastewater. These strains showed a rapid growth rate (1.10-1.30 d-1), a substantial increase in chlorophyll, and efficient removal of carbon (70-80%) as well as nitrogen and phosphate (80-90%) during mixotrophic cultivation in highly alkaline winery wastewater. Metabolic analysis unveiled the interplay among CO2 fixation, nitrogen assimilation, amino acid metabolism, and other key pathways, highlighting the ability of the microalgal strains to change their metabolic processes in response to extreme-pH conditions. Especially noteworthy is the elevated expression of organic acids in strain MAS1, suggesting their vital role in nutrient uptake in the alkaline environment. Harnessing these extremophilic traits negates the need for wastewater pretreatment and reduces both energy and chemical footprints, aligning with several UN Sustainable Development Goals. Our study thus presents new insights into the extremophilic nature of microalgal strains for remediation, biomass production, and broader biotechnological applications, paving the way for sustainable industrial innovations.

This research work investigated the techno-economic process design for cellulose hydrogel synthesis from corncob biomass and their swelling and kinetic behaviors analysis In this process, raw corncob (RCC) was fractionated by alkali treatment process to obtain corn cellulose fibers (CCF) and then copolymerization with gelatin to produced cellulose hydrogel composite (CHC). Their swelling efficiency of CHC was investigated in NaCl, CaCl2 and CO(NH2)2 solution by gravimetric method. The swelling capacity of CHC decreases with increasing salt concentration due to poor mass transfer diffusion. The dehydration kinetics of hydrogel were investigated at 30, 40 and 50¿°C temperature to find the diffusion mechanism of the process. The techno-economic analysis was to estimate the operating cost to be 9,671,000¿$/yr and annual revenue could be 12,230,000¿$/yr for the hydrogel production process. These superior properties of hydrogel can promote the possible utilization of water retention and fertilizer releasing agent in the agricultural process.

In the current study, the use of microwave-assisted sodium hydroxide medium (MWSH) for pre-treatment and saccharification of rice straw to obtain sugar syrup for the production of 5-hydroxymethyl furfural (5-HMF) was investigated. The optimization of the MWSH pre-treatment was carried out using central composite methodology, resulting in a maximum reducing sugar yield of 350 mg/g of treated rice straw (TRS) and a glucose yield of 255 mg/g of TRS under the conditions of a microwave power of 681 W, a NaOH concentration of 0.54 M, and a pre-treatment time of 3 min. Additionally, the microwave assisted transformation of sugar syrup with titanium magnetic silica nanoparticle as catalyst, producing 41.1 % yield of 5-HMF from the sugar syrup after 30 min microwave irradiation at 120 °C with catalyst loading of 2.0:200 (w/v)). The structural characterization of the lignin was analysed using 1H NMR techniques, and the surface carbon (C1s spectra) and oxygen (O1s spectra) composition changes of the rice straw during pre-treatment were analysed using X-ray photoelectron spectroscopy. The rice straw based bio-refinery process which contains MWSH pretreatment followed by dehydration of sugars achieved high efficiency of 5-HMF production.

Lignocellulosic biomass resource has been widely used as a natural resource for the synthesis of biofuels and bio-based products through pre-treatment, saccharification and fermentation processes. In this review, we delve into the environmental implications of bioethanol production from the widely utilized lignocellulosic biomass resource. The focus of our study is the critical stage of pre-treatment in the synthesis process, which also includes saccharification and fermentation. By collecting scientific data from the available literature, we conducted a comprehensive life cycle analysis. Our findings revealed substantial differences in the environmental burdens associated with diverse pre-treatment methods used for lignocellulosic biomass. These results highlight the importance of selecting environmentally benign pre-treatment techniques to promote the sustainability of bioethanol production. Future research directions are suggested, emphasizing the optimization of pre-treatment processes to further mitigate their environmental impact.

Sustainability evaluation of wastewater treatment helps to reduce greenhouse gas emis-sions, as it emphasizes the development of green technologies and optimum resource use rather than the end-of-pipe treatment. The conventional approaches for treating acid mine drainages (AMDs) are efficient; however, they need enormous amounts of energy, making them less sustainable and causing greater environmental concern. We recently demonstrated the potential of immobilized acid-adapted microalgal technology for AMD remediation. Here, this novel approach has been evaluated following emergy and carbon footprint analysis for its sustainability in AMD treat-ment. Our results showed that imported energy inputs contributed significantly (>90%) to the overall emergy and were much lower than in passive and active treatment systems. The microalgal treatment required 2¿15 times more renewable inputs than the other two treatment systems. Addition-ally, the emergy indices indicated higher environmental loading ratio and lower per cent renewa-bility, suggesting the need for adequate renewable inputs in the immobilized microalgal system. The emergy yield ratio for biodiesel production from the microalgal biomass after AMD treatment was >1.0, which indicates a better emergy return on total emergy spent. Based on greenhouse gas emissions, carbon footprint analysis (CFA), was performed using default emission factors, in ac-cordance with the IPCC standards and the National Greenhouse Energy Reporting (NGER) program of Australia. Interestingly, CFA of acid-adapted microalgal technology revealed significant greenhouse gas emissions due to usage of various construction materials as per IPCC, while SCOPE 2 emissions from purchased electricity were evident as per NGER. Our findings indicate that the immobilized microalgal technology is highly sustainable in AMD treatment, and its potential could be realized further by including solar energy into the overall treatment system.

Acid soils are the degraded (nutrient-poor) soils that generally lack microbial abundance required to promote plant growth. An insight into the microbial diversity in highly acidic soils is crucial from both ecological and environmental standpoints. Previously, we showed that inoculation of acid soils with acid-tolerant microalgae (algalization) significantly improved soil physicochemical and biological characteristics. In the present novel study involving a laboratory microcosm, high-throughput 16S rRNA amplicon sequencing analysis was performed to investigate the bacterial diversity in acid soils algalized with Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3 after 90 days of incubation. Our results on pooled DNA demonstrate that algalization of two acid soils (soil A and B) significantly increased several bacterial genera, and this observation is consistent with Shannon and Chao1 diversity indices. Actinobacteria, Acidobacteria, Firmicutes, and Proteobacteria were the most prevalent phyla enriched in all of the algalized treatments. Interestingly, nonalgalized acid soils favored only Firmicutes and Actinobacteria, but algalization significantly enriched Proteobacteria, Acidobacteria, and Actinobacteria. Canonical correspondence analysis revealed a positive effect of pH in soil A and both pH and organic carbon in soil B on enrichment. Furthermore, soil bacteria of ecological significance that belong to rhizobacteria and diazotrophs, such as Acetobacter, Azospirillum, Bradyrhizobium, Gluconacetobacter, Nitrobacter, Burkholderia, Comamonas, Herbaspirillum, Enterobacter, Nitrosococcus, Brevibacillus, Enterococcus, Frankia, and Anabaena, were greatly enriched in algalized treatments. Thus, we demonstrate here for the first time that algalization of acid soils significantly improves soil health through enrichment of bacteria that are largely implicated in promoting soil health and plant growth

Acclimatory phenotypic response is a common phenomenon in microalgae, particularly during heavy metal stress. It is not clear so far whether acclimating to one abiotic stressor can alleviate the stress imposed by another abiotic factor. The intent of the present study was to demonstrate the implication of acidic pH in effecting phenotypic changes that facilitate microalgal tolerance to biologically excess concentrations of heavy metals. Two microalgal strains, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, were exposed to biologically excess concentrations of Cu (0.50 and 1.0 mg L¿1), Fe (5 and 10 mg L¿1), Mn (5 and 10 mg L¿1) and Zn (2, 5 and 10 mg L¿1) supplemented to the culture medium at pH 3.5 and 6.7. Chlorophyll autofluorescence and biochemical fingerprinting using FTIR-spectroscopy were used to assess the microalgal strains for phenotypic changes that mediate tolerance to metals. Both the strains responded to acidic pH by effecting differential changes in biochemicals such as carbohydrates, proteins, and lipids. Both the microalgal strains, when acclimated to low pH of 3.5, exhibited an increase in protein (< 2-fold) and lipid (> 1.5-fold). Strain MAS1 grown at pH 3.5 showed a reduction (1.5-fold) in carbohydrates while strain MAS3 exhibited a 17-fold increase in carbohydrates as compared to their growth at pH 6.7. However, lower levels of biologically excess concentrations of the selected transition metals at pH 6.7 unveiled positive or no effect on physiology and biochemistry in microalgal strains, whereas growth with higher metal concentrations at this pH resulted in decreased chlorophyll content. Although the bioavailability of free-metal ions is higher at pH 3.5, as revealed by Visual MINTEQ model, no adverse effect was observed on chlorophyll content in cells grown at pH 3.5 than at pH 6.7. Furthermore, increasing concentrations of Fe, Mn and Zn significantly upregulated the carbohydrate metabolism, but not protein and lipid synthesis, in both strains at pH 3.5 as compared to their growth at pH 6.7. Overall, the impact of pH 3.5 on growth response suggested that acclimation of microalgal strains to acidic pH alleviates metal toxicity by triggering physiological and biochemical changes in microalgae for their survival.

Physiological changes that drive the microalgal-bacterial consortia are poorly understood so far. In the present novel study, we initially assessed five morphologically distinct microalgae for their ability in establishing consortia in Bold's basal medium with a bacterial strain, Variovorax paradoxus IS1, all isolated from wastewaters. Tetradesmus obliquus IS2 and Coelastrella sp. IS3 were further selected for gaining insights into physiological changes, including those of metabolomes in consortia involving V. paradoxus IS1. The distinct parameters investigated were pigments (chlorophyll a, b, and carotenoids), reactive oxygen species (ROS), lipids and metabolites that are implicated in major metabolic pathways. There was a significant increase (>1.2-fold) in pigments, viz., chlorophyll a, b and carotenoids, decrease in ROS and an enhanced lipid yield (>2-fold) in consortia than in individual cultures. In addition, the differential regulation of cellular metabolites such as sugars, amino acids, organic acids and phytohormones was distinct among the two microalgal-bacterial consortia. Our results thus indicate that the selected microalgal strains, T. obliquus IS2 and Coelastrella sp. IS3, developed efficient consortia with V. paradoxus IS1 by effecting the required physiological changes, including metabolomics. Such microalgal-bacterial consortia could largely be used in wastewater treatment and for production of value-added metabolites.

Phenotypic plasticity or genetic adaptation in an organism provides phenotypic changes when exposed to the extreme environmental conditions. The resultant physiological and metabolic changes greatly enhance the organism's potential for its survival in such harsh environments. In the present novel approach, we tested the hypothesis whether acid-adapted microalgae, initially isolated from non-acidophilic environments, can survive and grow in acid-mine-drainage (AMD) samples. Two acid-adapted microalgal strains, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, were tested individually or in combination (co-culture) for phenotypic changes during their growth in samples collected from AMD. The acid-adapted microalgae in AMD exhibited a two-fold increase in growth when compared with those grown at pH 3.5 in BBM up to 48 h and then declined. Furthermore, oxidative stress triggered several alterations such as increased cell size, granularity, and enhanced lipid accumulation in AMD-grown microalgae. Especially, the apparent limitation of phosphate in AMD inhibited the uptake of copper and iron in the cultures. Interestingly, growth of the acid-adapted microalgae in AMD downregulated amino acid metabolic pathways as a survival mechanism. This study demonstrates for the first time that acid-adapted microalgae can survive under extreme environmental conditions as exist in AMD by effecting significant phenotypic changes.

In this study, the effect of different modes of cultivation viz., photoautotrophic (AT), heterotrophic (HT) and photomixotrophic (MT), on the growth and biochemical responses of Chlorella sp. isolated from local ponds. The performance of microalgal growth was quantified using nonlinear growth models such as Gompertz, logistic, Baranyi-Roberts, Morgan under different cultivation conditions. The results revealed that microalgae could grow better in MT than in other cultivation modes with a major increase in biochemical responses for carbohydrates, which showed higher accumulation under HT. The maximum biomass concentration was 1.24 g L-1 (MT), 1.16 g L-1 (HT), 0.76 g L-1 (AT) with maximum specific growth rates of 0.0083 h-1 (HT), 0.0078 h-1 (MT) and 0.0055 h-1 (AT) respectively. The biomass concentration was higher in the order of MT>HT>AT for which MT yielded 8.8 fold higher biomass, compared with the initial biomass concentration, at the end of experiments (16 days). Concomitant increases in biochemical responses were observed in the three cultivation conditions. Protein and lipid accumulation in the MT mode was higher (1.2 fold) compared with the initial protein yield as well as the other cultivation modes. However, the carbohydrate yield was higher (1.12 fold) in the heterotrophic mode than in other cultivation conditions.

Biomass-derived adsorbents have been intensively studied due to their competence in reducing pollutants with conventional methods. Flowers are used as source in medicine, cosmetics and even as adsorbents for pollutant abatement. In this study, the microparticles from Chrysanthemum indicum were used as adsorbent for reducing the Congo red dye concentration from synthetic solution. Batch trials were evaluated to understand the influence of factors and optimization was carried out using central composite design. Maximum reduction (84.1%) achieved under the optimized settings of pH (1.0), adsorbent dose (300¿ppm), stirring speed (150¿rpm), and contact time (75¿min) at initial dye concentration (150¿ppm at 30¿°C). Microparticle size ensured with surface morphology of the adsorbent using electron microscopy and functional groups was studied using infrared spectroscopy techniques, respectively. Regression coefficient (R 2 ) value was obtained as 0.956 which indicates that the predicted values were in good agreement with their corresponding experimental values for the Congo red dye adsorption. Based on the investigation, it is inferred that the Chrysanthemum indicum flower has the potential for Congo red dye reduction from aqueous solution.

In this study, batch experiments were carried out to study the adsorption of Malachite green dye from aqueous solution by Mangifera indica (mango) seed kernel powder. The mango seed kernel powder was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Effect of various parameters including pH, contact time, adsorbent dosage, initial dye concentration and temperature on adsorption capacity of the adsorbent was observed and the optimized condition for maximum dye removal was identified. Maximum percentage removal of 96% was achieved with an adsorption capacity of 22.8¿mg/g at pH 6 with an initial concentration of 100¿mg/l. The equilibrium data were examined to fit the Langmuir and Freundlich isotherm models. Thermodynamic parameters for the adsorption process were also calculated.

At low temperature, the presence of oleaginous compound with fatty acids bound to crystallize and cause operability problems with compression engines. In this present investigation, seven different fatty acid methyl esters (FAMEs) biodiesel from vegetable oils (such as sunflower, coconut, jatropha, rice bran, palm, neem and mahua) were prepared by transesterification and were analyzed by gas chromatography (GC). Winterization of these synthesized biodiesel were carried out to find their usability at low temperatures (0 °C¿20 °C) and the crystals formed were separated. Further, the differential scanning colorimetry (DSC) was employed to identify the onset of melting point of the biodiesel from vegetable oils. The results showed that crystal formation was observed for various biodiesel except sunflower oil that recorded no crystal formation with minimum temperature of 0 °C. These findings suggest that biodiesel synthesized from sunflower can be used as such at low temperatures compared to the other synthesized biodiesel from vegetable oil.

Bicarbonate species in the aqueous phase is the primary source for CO2 for the growth of microalgae. The potential of carbon dioxide (CO2) fixation by Chlorella pyrenoidosa in enriched bicarbonate medium was evaluated. In the present study, effects of parameters such as pH, sodium bicarbonate concentration and inoculum size were assessed for the removal of CO2 by C. pyrenoidosa under mixotrophic condition. Central composite design tool from response surface methodology was used to validate statistical methods in order to study the influence of these parameters. The obtained results reveal that the maximum removal of CO2 was attained at pH 8 with sodium bicarbonate concentration of 3.33¿g/l, and inoculum size of 30¿%. The experimental results were statistically significant with R2 value of 0.9527 and 0.960 for CO2 removal and accumulation of chlorophyll content, respectively. Among the various interactions, interactive effects between the parameters pH and inoculum size was statistically significant (P¿<¿0.05) for CO2 removal and chlorophyll accumulation. Based on the studies, the application of C. pyrenoidosa as a potential source for carbon dioxide removal at alkaline pH from bicarbonate source is highlighted.

The aim of this study was to identify the potential for cultivation of Chlorella pyrenoidosa and Scenedesmus abundans in raw and autoclaved domestic wastewater (sewage) for nutrient removal, in a batch process. The growth was observed by measuring chlorophyll content. The inoculum size of 10% and 20% was used and the growth of microalgae and nutrient removal was monitored on daily basis. The maximum removal of ammonium nitrogen, phosphate and nitrates by Chlorella pyrenoidosa in raw samples was observed as 99%, 96% and 80%, respectively, whereas the maximum removal of ammonium nitrogen, phosphate and nitrates by Scenedesmus abundans in raw samples was observed as 98%, 95% and 83%, respectively. The maximum chlorophyll content was observed as 11.33 mg/l and 7.23 mg/l for C. pyrenoidosa and S. abundans, respectively, in raw samples. The experimental results reveal that both the microalgae are capable to grow and remove the nutrients from domestic wastewater.

Over groundwater exploitation owing to population, urbanization and industrialization make the groundwater unfavorable for living beings. This study deals with the assessment of groundwater quality in Gudiyattam and Vaniyambadi blocks of Vellore district, Tamil Nadu, India where groundwater is the major source of drinking due to deficiency in surface water. The significant physicochemical parameters such as pH, conductivity, total dissolved solids, chlorides, total alkalinity, calcium hardness, magnesium hardness and sulphate were assessed. Correlation matrix, box plot, multivariate statistical tools such as cluster analysis and principal component analysis were applied to groundwater quality analysis. The groundwater samples were assessed for its applicability in irrigation and drinking purposes and geographic information system techniques are used for mapping consequence. The parameters analyzed were compared with Bureau of Indian Standards (BIS) and WHO standards. Box plot analysis revealed that total dissolved solids and electrical conductivity was strongly correlated. Correlation analysis exhibits strong correlation (R2>0.7) between total dissolved solids and electrical conductivity, anions such as Ca2+ and Mg2+ for both the study areas.

Bicarbonate source for cultivation of microalgae is an alternate method mainly to avoid CO2 loss. The main aim of the work is to assess the bio-fixation ability of CO2 from ammonium bicarbonate by Chlorella pyrenoidosa under mixotrophic condition. Furthermore, statistical optimization has been carried out to study the influence of pH, concentration and inoculum size and identify best conditions for CO2 removal. The results revealed that maximum removal of CO2 was obtained at pH 6.0; with ammonium bicarbonate concentration, 6.66 g L-1 and inoculum size, 36.81%. The obtained results were statistically analyzed and the results were obtained with regression co-efficient R2 value of 0.94 for CO2 removal and 0.86 for corresponding chlorophyll content. From the study, it can be concluded that microalgae could able to grow in ammonium bicarbonate source which indicates that microalgae could assimilate ammonium and CO2 in to their cells even at high concentration. Bicarbonate captured CO2 proves to be a significant method for cultivation of microalgae supports commercial production.