Photosynthetic transients in Chlorella sorokiniana during phycoremediation of dairy wastewater under distinct light intensities

Kiran, Boda Ravi; Mohan, S. Venkata

doi:10.1016/j.biortech.2021.125593

Cited by 32 publications

(12 citation statements)

References 46 publications

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“…[ 39,40 ] The transients are O‐J defined as photochemical phase which signifies the reduction of QA to QA − , while J‐I and I‐P are thermal phases that intricate with the plastoquinone pool reduction and PSI electron acceptor, respectively. [ 41,39 ] The further elucidation was interpreted by considering the relative fluorescence between the phase O (50 µs) and K (300 µs) = V OK ; O (50 µs) and J (2 ms) = V OJ ; O (30 µs) and I (300 µs) = V OI ; I (30 ms) and P (500 ms) = V IP , and their corresponding kinetics differences were ΔV OK , ΔV OJ , ΔV OI and ΔV IP . O‐J phase revealed the K‐band, where the results clearly showed that EF/CC‐MA and EF/C‐MA depicted a positive K‐band, whereas EF/AV‐MA evidenced a negative K‐band, as shown in Figure a,b.…”

Section: Resultsmentioning

confidence: 99%

Cascading Integration of Electrofermentation and Photosynthesis—Low‐Carbon Biorefinery in Closed Loop Approach

Sravan,

Hemalatha,

Mohan

2023

Advanced Sustainable Systems

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Single‐chambered electrofermentation (EF) bioreactors are operated using spent wash to evaluate the effect of applied voltage (EF/AV; −0.6 V) against closed‐circuit (EF/CC; 100 Ω) and control (EF/C; no voltage/resistance) operations using deoiled microalgae biomass‐derived biochar electrodes (anode) on increasing acidogenesis rate/efficiency. Higher total volatile fatty acids (VFA) production (mg L−1) is observed in EF/AV (2866), depicting 31% and 57% increments than EF/CC (1984) and EF/C (1224), respectively. The VFA profiles (C2–C4) in EF/AV are higher with acetic/butyric/propionic acids (1922/704/240 mg L−1) and biogas co‐generation [H2 (22%) and CH4 (3%)] than EF/CC and EF/C. The applied voltage (EF/AV) helps in electron flux regulation for increasing substrates conversion and VFA generation. Residual VFA‐rich effluents from EF process is utilized as substrate to mixotrophic microalgae cultivation (nutrient‐ and stress‐phase) that resulted in biomass production with simultaneous wastewater treatment. EF/AV depicted higher biomass growth (0.72 g L−1; 4th day) and substrate removal (63%) than other operations. Integrations of electrofermentation with photosynthetic processes operated with the residual resources in effluents towards product valorization and wastewater polishing, accounts for low‐carbon economy.

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Section: Resultsmentioning

confidence: 99%

Cascading Integration of Electrofermentation and Photosynthesis—Low‐Carbon Biorefinery in Closed Loop Approach

Sravan,

Hemalatha,

Mohan

2023

Advanced Sustainable Systems

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“…In a previous study, Ravi Kiran and Venkata Mohan 37 used Chlorella sorokiniana cultures in synthetic DWW with initial concentrations of COD, NO 3 ‐N and PO 3 ‐P equal to 2000 mg L −1 , 70 mg L −1 and 108 mg L −1 , respectively. The authors reported that the lipid content of biomass at the end of the growth period ranged between 9.3% and 10.6% according to the applied light intensity.…”

Section: Resultsmentioning

confidence: 99%

Treatment of different dairy wastewater with Chlorella sorokiniana: removal of pollutants and biomass characterization

Iliopoulou

Zkeri

Panara

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: There is a continuous need for the development of novel processes for the sustainable management of dairy wastewater. The use of microalgae for wastewater decontamination and production of valuable biomass seems a promising alternative; however, limited information currently exists on the chemical characteristics of the biomass cultivated in effluents from the dairy industry. In this paper, experiments were carried out with the microalga Chlorella sorokiniana and different types of dairy effluents (raw dairy wastewater, anaerobically treated dairy wastewater, cheese whey). The collected biomass was characterized for the existence of proteins, starch, lipids, lutein, ⊎-carotene, polyphenolic compounds and amino acids.RESULTS: The removal of chemical oxygen demand and NH 4 -N was higher than 91% and 80%, respectively, for all types of dairy effluents, while the removal of total phosphorus ranged between 20% and 84%. The protein, starch and lipid contents of the microalgal biomass ranged between 28.6% and 52.8%, 10.5% and 13.3%, and 36.8% and 40.2%, respectively. The concentration of lutein increased after treatment, reaching values up to 508 mg kg −1 , whereas amino acid concentrations were decreased due to nitrogen inefficiency. The biomass cultivated in anaerobically treated dairy wastewater was characterized by the higher total phenolic content; tyrosol concentration reached 20.2 mg kg −1 . CONCLUSION: Chlorella sorokiniana can efficiently remove the major pollutants from effluents of dairy industry, while the produced biomass is a source of proteins, carbohydrates and lipids. Additionally, it contains important amounts of pigments, phenolic compounds and amino acids. Further research is required for the conditions that achieve optimal biochemical characteristics of the produced biomass.

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“…These strains were selected for screening based on their high growth rate, high phycoremediation, and biofuel potential in various effluents as reported in recent publications. 23–25…”

Section: Methodsmentioning

confidence: 99%

“…These strains were selected for screening based on their high growth rate, high phycoremediation, and biofuel potential in various effluents as reported in recent publications. [23][24][25] All the microalgal strains were cultured and maintained in BG11 media (Cat. No.…”

Section: Microalgal Culturesmentioning

confidence: 99%

Photosynthetic bioconversion of hydroponic effluent into biochemical-rich biomass for microalgal biorefineries

Tiwari,

Prajapati

2023

Environ. Sci.: Water Res. Technol.

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Photosynthetic transients in Chlorella sorokiniana during phycoremediation of dairy wastewater under distinct light intensities

Cited by 32 publications

References 46 publications

Cascading Integration of Electrofermentation and Photosynthesis—Low‐Carbon Biorefinery in Closed Loop Approach

Cascading Integration of Electrofermentation and Photosynthesis—Low‐Carbon Biorefinery in Closed Loop Approach

Treatment of different dairy wastewater with Chlorella sorokiniana: removal of pollutants and biomass characterization

Photosynthetic bioconversion of hydroponic effluent into biochemical-rich biomass for microalgal biorefineries

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