Insight into the rapid biogranulation for suspended single-cell microalgae harvesting in wastewater treatment systems: Focus on the role of extracellular polymeric substances

Wang, Qian; Shen, Qingyue; Wang, Jixiang; Zhao, Jiamin; Zhang, Zhenya; Lei, Zhongfang; Yuan, Tian; Shimizu, Kazuya; Liu, Yu; Lee, Dong Hoon

doi:10.1016/j.cej.2021.132631

Cited by 8 publications

(4 citation statements)

References 67 publications

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“…The EPS production increase in the first days of operation is linked to the granulation process and to the biomass higher settleability. Moreover, as pointed out in previous studies, a higher relative hydrophobicity is linked to a higher PN/PS ratio, which in turn is considered a triggering factor for granulation (Wang et al, 2022). Indeed, a PN/PS ratio sharp increase occurred from day-0 to -22, pointing this period as the beginning of the granulation process (Fig.…”

Section: Discussionsupporting

confidence: 63%

“…However, the separation of the biomass from the treated effluent represents a bottleneck in such systems. Microalgae cells' small size (3-30 μm), low density, and negative surface charges, greatly contribute to their poor settling characteristics (Wang et al, 2022). Granulation of microalgae biomass represents an attractive solution to overcome separation and harvesting issues.…”

Section: Introductionmentioning

confidence: 99%

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Bioremediation of coastal aquaculture effluents spiked with florfenicol using microalgae-based granular sludge – a promising solution for recirculating aquaculture systems

et al. 2023

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Section: Discussionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Bioremediation of coastal aquaculture effluents spiked with florfenicol using microalgae-based granular sludge – a promising solution for recirculating aquaculture systems

et al. 2023

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“…Similarly, polysaccharides were responsible for cell capture and aggregation during the rapid biogranulation of the microalgae Ankistrodesmus falcatus var. acicularis [36]. The polysaccharide derived from T. subcordiformis should be further investigated via extraction and analyses to determine its influence on the sedimentation properties.…”

Section: Resultsmentioning

confidence: 99%

Application of Extracellular Polymeric Substances during Cultivation of Microalgae Biomass

Rusanowska,

Zieliński,

Dudek

et al. 2023

Applied Sciences

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Extracellular polymeric substances (EPS) produced by microorganisms contain polymers that are used for the bioflocculation of microalgae; however, these polymers are also organic compounds that might be used as carbon sources. The study analyzed two strategies for the introduction of EPS for Tetraselmis subcordiformis, Chlorella sp., and Arthrospira platensis biomass harvesting. In the first variant, EPS in the dose of 100 mg TOC/g were added to the photobioreactor every other day from the beginning of the cultivation, while in the second variant, EPS in the two doses of 100 mg TOC/g and 300 mg TOC/g were only added at the end of cultivation. In the first variant, the results proved that microalgae/cyanobacteria can use the EPS as external carbon sources. The cultures were characterized by a faster increase in biomass concentration, which contained less chlorophyll. However, the EPS content did not change. In the second variant, the addition of EPS did not affect the EPS content and the sedimentation of the Chlorella sp. biomass. The biomass of T. subcordiformis was characterized by a much better sedimentation coefficient. The greatest differences were observed in the A. platensis culture: the biomass concentration increased from 1.2 ± 0.2 g/L to 1.9 ± 0.2 g/L, EPS content increased by 16%, and sedimentation efficiency increased to 72%.

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“…As the algae photosynthesize, they release oxygen into the water, which improves its quality and supports aerobic conditions. Once the algae have absorbed nutrients and pollutants, they can be separated from the treated wastewater using sedimentation, filtration, or other methods [126,127]. The clean water can then be discharged or subjected to further treatment if needed.…”

Section: Prospective Of Algae In Biocon Co 2 Processmentioning

confidence: 99%

A Review of the Recent Advancement of Bioconversion of Carbon Dioxide to Added Value Products: A State of the Art

2023

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Excessive dependence on fossil fuels increases GHG emissions and carbon levels in the atmosphere, leading to climatic changes. This phenomenon can be reversed by capturing the carbon via “carbon capture and storage” (CCS) or “carbon capture and utilize” (CCU) technologies. In CCS methods, the captured carbon is stored in natural sinks (e.g., oceans), whereas, in CCU methods, the carbon is converted into useful products. Among CCU methods, the biological conversion of CO2 (BioConCO2) into value-added chemicals has gained great attention. This review focuses on providing an overview of the recent advances in CO2 utilization technology with a focus on the BioConCO2. The theoretical background and technical drivers, challenges, and setbacks of upscaling and commercialization of BioConCO2 are critically discussed with implications for future improvements. The BioConCO2 is increasingly attracting the attention of researchers and industrialists for its capacity to operate under low CO2 concentrations and in the presence of impurities (common conditions in industrial flue gases)—among other numerous advantages. While upscaling algae-based BioConCO2 has operational and financial challenges, bioconversion via bacteria and genetically engineered cyanobacterial seems promising due to their efficiency and flexibility.

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Insight into the rapid biogranulation for suspended single-cell microalgae harvesting in wastewater treatment systems: Focus on the role of extracellular polymeric substances

Cited by 8 publications

References 67 publications

Bioremediation of coastal aquaculture effluents spiked with florfenicol using microalgae-based granular sludge – a promising solution for recirculating aquaculture systems

Bioremediation of coastal aquaculture effluents spiked with florfenicol using microalgae-based granular sludge – a promising solution for recirculating aquaculture systems

Application of Extracellular Polymeric Substances during Cultivation of Microalgae Biomass

A Review of the Recent Advancement of Bioconversion of Carbon Dioxide to Added Value Products: A State of the Art

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