Microalgae based wastewater treatment: a shifting paradigm for the developing nations

Moondra, Nandini; Jariwala, Namrata; Christian, R. A.

doi:10.1080/15226514.2020.1857333

Cited by 13 publications

(7 citation statements)

References 47 publications

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“…Unlike toxic heavy metals, Ca and Mg are essential for the growth and development of microalgae and cyanobacteria, since both influence the photosynthetic enzymatic activities as well as other enzymes regulating different cell activities [51,52]. Moreover, the increase in the pH of the water also helps to remove the TDS as well as hardness ions [53,54]. A similar association of increase in pH and decrease in EC and TDS is also observed in our study.…”

Section: Discussionsupporting

confidence: 87%

Comparative Evaluation of Chlorella vulgaris and Anabaena variabilis for Phycoremediation of Polluted River Water: Spotlighting Heavy Metals Detoxification

Ahammed

Baten

Ali

et al. 2023

Biology

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This study investigated the phycoremediation abilities of Chlorella vulgaris (microalga) and Anabaena variabilis (cyanobacterium) for the detoxification of polluted river water. Lab-scale phycoremediation experiments were conducted for 20 days at 30 °C using the microalgal and cyanobacterial strains and water samples collected from the Dhaleswari river in Bangladesh. The physicochemical properties such as electrical conductivity (EC), total dissolved solids (TDS), biological oxygen demand (BOD), hardness ions, and heavy metals of the collected water samples indicated that the river water is highly polluted. The results of the phycoremediation experiments demonstrated that both microalgal and cyanobacterial species significantly reduced the pollutant load and heavy metal concentrations of the river water. The pH of the river water was significantly raised from 6.97 to 8.07 and 8.28 by C. vulgaris and A. variabilis, respectively. A. variabilis demonstrated higher efficacy than C. vulgaris in reducing the EC, TDS, and BOD of the polluted river water and was more effective at reducing the pollutant load of SO42− and Zn. In regard to hardness ions and heavy metal detoxification, C. vulgaris performed better at removing Ca2+, Mg2+, Cr, and Mn. These findings indicate that both microalgae and cyanobacteria have great potential to remove various pollutants, especially heavy metals, from the polluted river water as part of a low-cost, easily controllable, environmentally friendly remediation strategy. Nevertheless, the composition of polluted water should be assessed prior to the designing of microalgae- or cyanobacteria-based remediation technology, since the pollutant removal efficiency is found to be species dependent.

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Section: Discussionsupporting

confidence: 87%

Comparative Evaluation of Chlorella vulgaris and Anabaena variabilis for Phycoremediation of Polluted River Water: Spotlighting Heavy Metals Detoxification

Ahammed

Baten

Ali

et al. 2023

Biology

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“…The observed algal culture pH rose sharply within the first 2 days of the study and relatively stabilised between 9 and 9.5 days (Fig. 1); this is consistent with the pH variations in a similar study conducted by Moondra et al 37 The observed pH gives an indication that growth from photosynthesis is occurring as a result of CO 2 and nutrient consumption from the culture. 38,39 This could partly be explained by the fact that nitrate-nitrogen consumption produces excess OH − ions responsible for the pH rise, as postulated by Wang and Curtis.…”

Section: Growth Kinetics Nutrient Removal and Co 2 Sequestrationsupporting

confidence: 89%

Evaluation of green microalgal strains for simultaneous municipal wastewater treatment and heavy metal bioremediation

Ahiahonu,

Anku,

Roopnarain

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDMicroalga‐assisted wastewater treatment systems have gained attention for their efficiency in removing nutrients, chemical oxygen demand, toxic heavy metals and other dissolved compounds, while also producing valuable biomass and demonstrating high CO2 biofixation potential. The current research focuses on investigating the municipal wastewater phycoremediation and heavy metal biosorption ability of three indigenous freshwater microalgal strains: Tetradesmus reginae, Tetradesmus obliquus and Chlorella sorokiniana.RESULTSThe research findings indicate that the microalgal strains T. reginae, T. obliquus and C. sorokiniana exhibited notable performance in biomass accumulation. Specifically, the biomass accumulations were 2.215 ± 0.002, 1.143 ± 0.006 and 0.856 ± 0.021 g L−1, respectively, with initial culture biomasses ranging from 0.5 to 0.6 g L−1. These strains significantly reduced toxic heavy metals (As, 46.86–60.12%; Cd, 52.96–83.18%; Cr, 73.49–82.18%; and Pb, 95.38–96.25%), nutrients (NH4+ & NO3− 100% and PO43− 78–86.41%) as well as chemical oxygen demand (46.02–67.35%), and biosequestered CO2 (0.8–0.18 gCO2 L−1 d−1) during the growth period. Among the strains, T. reginae emerged as the top performer. The Fourier transform infrared spectra of the strain's biomass confirmed the presence of specific functional groups, such as CH, NH, OH and CN, which play a crucial role in ionising and reacting with toxic metal ions and protons in the wastewater.CONCLUSIONThis study has shown that the isolated wild microalgal strains have promising phycoremediation and heavy metal adsorption characteristics. Moreover, they exhibit promising rates of CO2 biosequestration. These findings underscore the potential of microalga‐assisted wastewater treatment systems for efficient and eco‐friendly wastewater remediation, as well as biomass generation and CO2 mitigation. © 2024 Society of Chemical Industry (SCI).

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“…Microalgae are increasingly being used in municipal sewage and industrial heavy metal treatments. The microalga treatment of these types of sewage can avoid secondary pollution and aid recycling, improving the efficiency of sewage treatment, and reducing its cost [ 36 ]. At the same time, microalgae utilize different biological mechanisms when treating different types of sewage.…”

Section: Discussionmentioning

confidence: 99%

Integrated Omics Approach to Discover Differences in the Metabolism of a New Tibetan Desmodesmus sp. in Two Types of Sewage Treatments

Wang

Chen

Zhang³

et al. 2023

Metabolites

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Microalgae are now widely applied in municipal (YH_3) and industrial sewage (YH_4) treatments. Through integrated omics analysis, we studied the similarities and differences at the molecular level between the two different types of sewage treatment processes. The most significantly enriched gene ontology (GO) terms in both types of sewage treatments were the ribosome, photosynthesis, and proteasome pathways. The results show that the pathways of differentially expressed genes (DEGs) and differentially accumulated metabolites (DAMs) were enriched for photosynthesis, glyoxylate and dicarboxylate metabolism, and carbon fixation in photosynthetic organisms. Considering YH_3 vs. YH_4, the metabolism of citrate, sedoheptulose-7P, and succinate was significantly upregulated. In addition, the results showed that the pathways of DEGs and DAMs were enriched in terms of amino acid metabolism and carotenoid biosynthesis in YH_4 vs. YH_3. The metabolism of S-Adenosyl-L-homocysteine was significantly downregulated, 2-oxobutanoate was significantly upregulated and downregulated, and the metabolism of abscisic acid glucose ester (ABA-GE) was also significantly upregulated. Overall, the results of this paper will help to improve the basic knowledge of the molecular response of microalgae to sewage treatments, and help design a response strategy based on microalgae for complex, mixed sewage treatments.

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Microalgae based wastewater treatment: a shifting paradigm for the developing nations

Cited by 13 publications

References 47 publications

Comparative Evaluation of Chlorella vulgaris and Anabaena variabilis for Phycoremediation of Polluted River Water: Spotlighting Heavy Metals Detoxification

Comparative Evaluation of Chlorella vulgaris and Anabaena variabilis for Phycoremediation of Polluted River Water: Spotlighting Heavy Metals Detoxification

Evaluation of green microalgal strains for simultaneous municipal wastewater treatment and heavy metal bioremediation

Integrated Omics Approach to Discover Differences in the Metabolism of a New Tibetan Desmodesmus sp. in Two Types of Sewage Treatments

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