Microalgae: A green eco-friendly agents for bioremediation of tannery wastewater with simultaneous production of value-added products

Devi, Anuradha; Verma, Meenakshi; Saratale, Ganesh Dattatraya; Saratale, Ganesh Dattatraya; Ferreira, Laura; Mulla, Sikandar I.; Bharagava, Ram Naresh

doi:10.1016/j.chemosphere.2023.139192

Cited by 35 publications

(3 citation statements)

References 124 publications

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“…Simultaneously, carbon dioxide (CO 2 ) generated by the bio-oxidation of organic matter serves as the carbon source for algal growth. The harvested biomass can be converted to value-added products such as biofuel, bioplastic, and biofertilizer (Arora et al 2021, Devi et al 2023). However, biomass harvesting hindered the largescale application of algae-based systems due to the poor settling ability of algae (Liu and Hong 2021).…”

Section: Introductionmentioning

confidence: 99%

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Zhang,

El-Sayed,

Zhang

et al. 2024

Preprint

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Algal-bacterial granules have been drawing attention in wastewater treatment due to their rapid settling ability and efficient nutrient removal performance. This study evaluated the impact of air flow rates on nitrogen removal and the formation of algal-bacterial granules in domestic wastewater treatment. The highest nitrogen removal efficiency was achieved by operating with two separate feedings and the addition of an external carbon source. The higher air flow rate resulted in a higher nitrification rate and produced smaller and more compact granules on average. However, increasing the air flow rate did not necessarily increase extracellular polymeric substances (EPS) production. Computational Fluid Dynamics (CFD) simulations revealed that mechanical mixing was the primary source of shear force. Increasing the air flow rate from 0.2 LPM to 0.5 LPM only yielded a 12% increment in the volume-averaged strain rate. Further analysis of microbial communities showed that changes in bioreactor operation, especially sodium acetate addition and aerations, shifted the microbial community composition. The sodium acetate addition led to the increase of microbial diversity and the relative abundance of denitrifiers such as Thauera, while the aeration caused the increasing relative abundances of nitrogen-related genera (such as Nitrospira) and the decreasing relative abundances of cyanobacteria and Chlorella in the long-term operation of the photobioreactors. Moreover, the decrease in total abundance of grazers and pathogens along with the operation, including Chytridiomycetes, Sessilida, and Operculariidae, might result from the shear force and the decrease of prokaryotic species, such as Chlorella spp..

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Section: Introductionmentioning

confidence: 99%

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Zhang,

El-Sayed,

Zhang

et al. 2024

Preprint

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“…Microalgalbased remediation has unique advantages over other remediation methods, making it a more effective and sustainable technology. 11 Wastewater treatment using microalgal-bacterial cocultures have been reported to improve nutrient removal efficiency through their synergistic interactions (Figure 1a and 1b). 12 Microalgae can assimilate inorganic N, reducing it to very low environmental concentrations (<0.5 mg/L), while bacteria can remove N through anaerobic ammonia oxidation, assimilation, denitrification, and nitrification.…”

Section: Introductionmentioning

confidence: 99%

“…Microalgae are rapidly reproducing photosynthetic microorganisms, made up of more than 3,000 species. Microalgal-based remediation has unique advantages over other remediation methods, making it a more effective and sustainable technology . Wastewater treatment using microalgal-bacterial cocultures have been reported to improve nutrient removal efficiency through their synergistic interactions (Figure a and b) .…”

Section: Introductionmentioning

confidence: 99%

Microalgae Shed Light on Interconnected Nitrogen Transformation in Microalgal-Bacterial Consortia

Li,

Zhang,

Bai

et al. 2024

ACS EST Water

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Nitrogen is a component of many fundamental biomolecules and also participates in environmental redox chemistry. Nitrogen pollution is a serious environmental problem. Biological nitrogen removal is one of the most significant issues in wastewater treatment. Microbial-driven nitrogen transformations are carried out through metabolic pathways. Wastewater treatment systems using microalgal-bacterial cocultures can improve nutrient removal efficiency through interspecies synergistic interactions. However, relevant studies on the nitrogen metabolism and microbial characteristics of microalgal-bacterial systems have not been systematically reviewed and discussed. This Review comprehensively analyzes nitrogen contaminants in various biological nitrogen removal microalgal-bacterial composite systems and summarizes the microbial characteristics and nitrogen-metabolizing enzymes present. Nitrogen metabolism regulation methods involving quorum sensing and genetic regulation are described, and methods of enhancing microbial nitrogen removal through microbial community interactions, enhancing enzyme activity, and promoting electron transfer are introduced in detail. This Review provides a perspective on the improvement and optimization of microalgalbacterial wastewater treatment technology through analyzing the nitrogen metabolism and increasing process performance.

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Sustainable Algal Industrial Wastewater Treatment

Devi,

Saran,

Saratale

et al. 2024

Microbes Based Approaches for the Management of Hazardous Contaminants

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Microalgae: A green eco-friendly agents for bioremediation of tannery wastewater with simultaneous production of value-added products

Cited by 35 publications

References 124 publications

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Microalgae Shed Light on Interconnected Nitrogen Transformation in Microalgal-Bacterial Consortia

Sustainable Algal Industrial Wastewater Treatment

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