Microalgal–Bacterial Flocs and Extracellular Polymeric Substances: Two Essential and Valuable Products of Integrated Algal Pond Systems

Jimoh, Taobat A.; Keshinro, M. Olajide; Cowan, A. Keith

doi:10.1007/s11270-019-4148-3

Cited by 28 publications

(8 citation statements)

References 149 publications

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“…However, there was a great difference between our study, where two algal species were inoculated and then colonised the entire wastewater volume, and the previous studies where a consortium of different wild algal species and bacteria was colonising the wastewater. It is possible that a well‐established algae‐bacteria consortium is easier to flocculate than single strain cultures, as co‐cultivated microalgae and bacteria tend to produce naturally occurring small flocs (Jimoh et al, 2019; Nguyen et al, 2019). These pre‐existing flocs might contribute to the flocculation using tannins and other polymeric substances, even in a wastewater culture.…”

Section: Discussionmentioning

confidence: 99%

The use of natural organic flocculants for harvesting microalgae grown in municipal wastewater at different culture densities

Niemi

Gentili

2021

Physiologia Plantarum

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Harvesting microalgae from liquid culture is a difficult issue to solve and is most commonly done through settling. However, settling is a slow process on its own and generally needs to be induced chemically or by introducing stress to the culture. Polymeric, cationic substances, such as cationised starch and chitosan, are often used for flocculation and settling. These large, positively charged molecules form large clusters with suspended particles in the liquid medium. In the present study, three natural organic flocculants (cationic starch, chitosan and acacia tannin S5T) were tested to harvest microalgal cultures grown in wastewater. Two microalgal species, one strain of Chlorella vulgaris and one strain of Scenedesmus obliquus, were cultured in municipal wastewater for different lengths of time, and settled using either cationic starch, chitosan or acacia tannin S5T. Results indicated that S5T worked with approximately the same efficiency in the two assayed species, although it requires a relatively high dosage to function (about 300 mg L −1 ), while the other two flocculants varied from species to species.

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Section: Discussionmentioning

confidence: 99%

The use of natural organic flocculants for harvesting microalgae grown in municipal wastewater at different culture densities

Niemi

Gentili

2021

Physiologia Plantarum

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“…Based on a previous study, we tried to select floc-forming bacteria, which are expected to form floc with microalgae, among strains derived from wastewater (Jimoh et al, 2019;Petrini et al, 2020). C. flocculans KCTC 62943 was isolated from a livestock wastewater treatment plant wastewater sample (52-109, Gyebaek-ro 499beon-gil, Chaeun-myeon, Nonsan-si, Chungcheongnam-do, 36 • 10 ′ 36.6 ′′ N, 127 • 03 ′ 10.4 ′′ E; Kim et al, 2019.…”

Section: Collection and Screening Of Floc-forming Bacterial Strainsmentioning

confidence: 99%

“…However, no flocs formed in the EC condition, where E. coli and C. sorokiniana were cultured together, or in the pure culture of C. sorokiniana (N condition). Based on previous studies, the cause of the formation of floc composed of microalgae and bacteria was expected to be from bacteria-derived materials, including EPS, and it was suggested that the difference in the material produced by each bacteria would be involved in the formation and characteristic of floc (Jimoh et al, 2019).…”

Section: Flocculation and Sedimentation Of Bacterial And Algal Flocsmentioning

confidence: 99%

Effects of Co-culture on Improved Productivity and Bioresource for Microalgal Biomass Using the Floc-Forming Bacteria Melaminivora Jejuensis

Kim

Yun

Kim

et al. 2020

Front. Bioeng. Biotechnol.

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Bacterial and algal floc formation was induced by inoculating three species of wastewater-derived bacteria (Melaminivora jejuensis, Comamonas flocculans, and Escherichia coli) into algal cultures (Chlorella sorokiniana). Bacterial and algal flocs formed in algal cultures inoculated with M. jejuensis and C. flocculans, and these flocs showed higher sedimentation rates than pure algal culture. The floc formed by M. jejuensis (4988.46 ± 2589.81 μm) was 10-fold larger than the floc formed by C. flocculans (488.60 ± 226.22 μm), with a three-fold higher sedimentation rate (M. jejuensis, 91.08 ± 2.32% and C. flocculans, 32.55 ± 6.33%). Biomass and lipid productivity were improved with M. jejuensis inoculation [biomass, 102.25 ± 0.35 mg/(L·day) and 57.80 ± 0.20 mg/(L·day)] compared with the productivity obtained under pure algal culture conditions [biomass, 78.00 ± 3.89 mg/(L·day) and lipids, 42.26 ± 2.11 mg/(L·day)]. Furthermore, the fatty acid composition of the biomass produced under pure algal culture conditions was mainly composed of C16:0 (43.67%) and C18:2 (45.99%), whereas the fatty acid composition of the biomass produced by M. jejuensis was mainly C16:0 (31.80%), C16:1 (24.45%), C18:1 (20.23%), and C18:2 (16.11%). These results suggest the possibility of developing an efficient method for harvesting microalgae using M. jejuensis and provide information on how to improve biomass productivity using floc-forming bacteria.

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“…Microbial interactions during anaerobic fermentation, bacterial oxidation and photosynthetic oxygenation produces effluent that can be reclaimed and reused and which is of the standard in South Africa for either discharge or irrigation established by the Department of Water and Sanitation (Mambo et al, 2014a). In addition, mixed liquor suspended solids generated in the high rate algal oxidation ponds (HRAOP) in the form of microalgal‐bacterial flocs (MaB‐flocs) is a valuable resource and of biotechnological importance (Jimoh & Cowan, 2017; Jimoh et al, 2019). Once harvested, this biomass can be valorised into products such as biofuels, animal feeds and fertilisers (Coppens et al, 2016; Van Den Hende et al, 2014; Wieczorek et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Advanced oxidation as tertiary treatment for recovery of effluent from an integrated algal pond system

Jimoh

Laubscher

Askew³

et al. 2021

Water & Environment J

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In contemporary water‐scarce regions and with increasing pressure on the built environment, access to quality water within the peri‐urban space is of concern. It has been argued that integrated algal pond systems (IAPS) are ideally suited as these systems offer value recovery and water for irrigation. Advanced oxidation (AO) was evaluated as tertiary treatment for inclusion into the IAPS process. Chemical oxygen demand (COD), total suspended solids (TSS) and ammonium‐N in effluent from an IAPS treating municipal sewage were monitored after exposure to AO. All measured parameters were reduced but reduction in COD occurred only after long‐term exposure or high dosage. COD, TSS and ammonium‐N concentrations were reduced by 2%, 30% and 28%, respectively, within 24 h. Addition of an AO unit to the IAPS process can upgrade water quality to a level satisfactory for recovery to irrigation or for discharge without any substantial increase in process footprint.

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Microalgal–Bacterial Flocs and Extracellular Polymeric Substances: Two Essential and Valuable Products of Integrated Algal Pond Systems

Cited by 28 publications

References 149 publications

The use of natural organic flocculants for harvesting microalgae grown in municipal wastewater at different culture densities

The use of natural organic flocculants for harvesting microalgae grown in municipal wastewater at different culture densities

Effects of Co-culture on Improved Productivity and Bioresource for Microalgal Biomass Using the Floc-Forming Bacteria Melaminivora Jejuensis

Advanced oxidation as tertiary treatment for recovery of effluent from an integrated algal pond system

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