Flocculation properties of eight microalgae induced by aluminum chloride, chitosan, amphoteric polyacrylamide, and alkaline: Life-cycle assessment for screening species and harvesting methods

Wang, Quan; Oshita, Kazuyuki; Takaoka, Masaki

doi:10.1016/j.algal.2021.102226

Cited by 26 publications

(7 citation statements)

References 49 publications

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“…Maximum harvesting efficiencies of 96.5%, 96.3%, 95.9%, 94.8%, and 91.7% were achieved using 25 mg L −1 AlCl 3 , 50 mg L −1 FeCl 3 , 0.8 g L −1 CGS, 16 mL L −1 MDFE and 12 mL L −1 MO, respectively. The results obtained in this study were similar to those achieved by Wang et al , 55 with 97% harvesting efficiency of Coccomyxa sp. and Chlorella vulgaris using 30 mg L −1 AlCl 3 .…”

Section: Resultssupporting

confidence: 92%

“…Furthermore, the coagulation efficiency of different coagulants can be affected by microalgae species, cell sizes, cell surface features, cell densities, zeta potentials, and cell stability. 55,58,59 It has been reported that 30 mg L −1 AlCl 3 harvested 97% of both Coccomyxa sp. K.J.…”

Section: Resultsmentioning

confidence: 99%

“…and Chlorella vulgaris ; however, 1000 mg L −1 AlCl 3 was required to achieve the same harvesting efficiency (%) for Chlamydomonas reinhardtii . 55…”

Section: Resultsmentioning

confidence: 99%

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Establishing the nexus between the coagulant for microalgae harvesting and the biomass nutrient assemblage

et al. 2023

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

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Establishing the nexus between the coagulant for microalgae harvesting and the biomass nutrient assemblage

et al. 2023

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“…The thickened, emissions-sparged culture achieved 60% biomass recovery and 4.5% ± 1.5% solids in the settled bulk. In studies of bioflocculation or chemical flocculation and sedimentation, 34% to 99% and 67% to 99% biomass recovery was achieved, respectively, and 0.5% to 3% solids was typical. ,− However, autoflocculation avoids chemical or biological inputs, which can contaminate the product, contaminate media which could otherwise be recycled, necessitate production of synthetic materials, and increase production cost . An additional advantage of the results of this study was that flocculation was facilitated during cultivation, which avoids an added harvest period for the flocculation action of a biological or chemical flocculating agent.…”

Section: Results and Discussionmentioning

confidence: 87%

Sustainably Cultivating and Harvesting Microalgae through Sedimentation and Forward Osmosis Using Wastes

2021

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Cost-effective nutrient sources and dewatering are major obstacles to sustainable, scaled-up cultivation of microalgae. Employing waste resources as sources of nutrients offsets costs for nutrient supplies while adding value through simultaneous waste treatment. Forward osmosis (FO), using simulated reverse osmosis brine, is a low-energy membrane technology that can be employed to efficiently harvest microalgae from a dilute solution. In this study, Scenedesmus obliquus, a green microalga, was cultivated with a fertilizer plant wastewater formula and simulated coal-fired power plant flue gas and then separated through either FO, with reverse osmosis reject model water as the draw solution, or sedimentation. Microalgal batches grown with simulated wastewater removed NH 4 + within 2 days and reached nitrogen and phosphorus limitation simultaneously on Day 5. Sparging with the flue gas caused S. obliquus to produce significantly greater quantities of extracellular polymeric substances (30.7 ± 1.8 μg mL −1 ), which caused flocculation and enhanced settling to an advantageous extent. Five-hour FO trials showed no statistically significant difference (p = 0.65) between water fluxes for cultures grown with simulated flue gas and CO 2 -supplemented air (3.0 ± 0.1 and 3.0 ± 0.3 LMH, respectively). Reverse salt fluxes were low for all conditions and, remarkably, the rate of reverse salt flux was −1.9 ± 0.6 gMH when the FO feed was culture grown with simulated flue gas. In this work, S. obliquus was cultivated and harvested with potential waste resources.

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“…Nevertheless, technology gaps of the flocculation process still exist in these reported techniques. Inorganic flocculants (ferric and aluminium sulfate) bring contaminations to the algae biomass and flocculated medium (Papazi et al, 2010;Wang et al, 2021). In contrast, organic flocculants demonstrate a high recovery efficiency of freshwater microalgae and leave few pollutants to the algae biomass, but only a part of them are efficient for marine microalgae harvest (Bilanovic et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

A Novel Salt-Bridge Electroflocculation Technology for Harvesting Microalgae

Hou

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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Microalgae biomass, as a promising alternative feedstock, can be refined into biodiesel, pharmaceutical, and food productions. However, the harvesting process for quality biomass still remains a main bottleneck due to its high energy demand. In this study, a novel technique integrating alkali-induced flocculation and electrolysis, named salt-bridge electroflocculation (SBEF) with non-sacrificial carbon electrodes is developed to promote recovery efficiency and cost savings. The results show that the energy consumption decreased to 1.50 Wh/g biomass with a high harvesting efficiency of 90.4% under 300 mA in 45 min. The mean particle size of algae flocs increased 3.85-fold from 2.75 to 10.59 µm, which was convenient to the follow-up processing. Another major advantage of this method is that the salt-bridge firmly prevented cells being destroyed by the anode’s oxidation and did not bring any external contaminants to algal biomass and flocculated medium, which conquered the technical defects in electro-flocculation. The proposed SBEF technology could be used as a low cost process for efficient microalgae harvest with high quality biomass.

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Flocculation properties of eight microalgae induced by aluminum chloride, chitosan, amphoteric polyacrylamide, and alkaline: Life-cycle assessment for screening species and harvesting methods

Cited by 26 publications

References 49 publications

Establishing the nexus between the coagulant for microalgae harvesting and the biomass nutrient assemblage

Establishing the nexus between the coagulant for microalgae harvesting and the biomass nutrient assemblage

Sustainably Cultivating and Harvesting Microalgae through Sedimentation and Forward Osmosis Using Wastes

A Novel Salt-Bridge Electroflocculation Technology for Harvesting Microalgae

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