Harvesting Porphyridium purpureum using polyacrylamide polymers and alkaline bases and their impact on biomass quality

Vu, Hang P.; Nguyen, Dinh Duc; Vu, Minh T.; Labeeuw, Leen; Emmerton, Benjamin; Commault, Audrey S.; Ralph, Peter J.; Mahlia, T.M.I.; Nghiem, Long D.

doi:10.1016/j.scitotenv.2020.142412

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…While for polymers of higher molecular weight, the bridging mechanism occurred along the polymer chain. Vu et al [58] observed a similar mechanism, evaluating polyacrylamidebased flocculants in the flocculation of the red microalgae Porphyridium purpureum.…”

Section: Chemical Coagulation/flocculationmentioning

confidence: 72%

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A comparative analysis of algal biomass densification methods aimed at the biofuel production

Santos¹,

Bassin²,

Cammarota³

2023

World J. Adv. Eng. Technol. Sci.

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The reduced size of the cells (< 30 µm in diameter) and the low cell concentration of microalgae and cyanobacteria cultures (0.5 g/L on average) greatly hinder the densification of the biomass, a crucial step to becoming biofuel production from algal biomass economically viable. To identify the best densification method, about 90 studies applied to 60 different microalgae and cyanobacteria were compiled through an extensive literature survey, classified into eight methods of algal biomass densification, and analyzed regarding the harvesting efficiency, energy consumption, and costs. Low-cost methods (spontaneous settling, autoflocculation, and bioflocculation) can achieve high densification only with specific species and conditions. On the contrary, many species only achieve high densification using high-cost methods (centrifugation, membrane filtration, electrocoagulation). Based on the analyzed data, researchers should focus on selecting species that combine the desired characteristics for the downstream processes with their potential for biofuel production.

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Section: Chemical Coagulation/flocculationmentioning

confidence: 72%

“…Precipitation occurs mainly at pH values between 9.5 and 11. It is a low-cost method, as it does not use large volumes of chemical coagulants and does not require complex equipment [58,81].…”

Section: Autoflocculationmentioning

confidence: 99%

A comparative analysis of algal biomass densification methods aimed at the biofuel production

Santos¹,

Bassin²,

Cammarota³

2023

World J. Adv. Eng. Technol. Sci.

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“…Treated water using plant-based coagulant also showed no/minimum harm to aquatic environment. Vu et al [53] utilize recycled aquaculture water treated by chitosan which showed no negative effect to the cultured species. With this insight, water recycling and sludge conversion into fertilizer are the benefits of this bio-coagulant method.…”

Section: Analysis Of Benefitmentioning

confidence: 99%

Performance of Chemical-Based vs Bio-Based Coagulants in Treating Aquaculture Wastewater and Cost-benefit Analysis

Kurniawan¹,

Ahmad²,

Imron³

et al. 2022

Pol. J. Environ. Stud.

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Aquaculture sector plays important role for the economic development in Malaysia, but environmental concerns are arising due to the pollution caused by the discharge of untreated wastewater. Coagulation-flocculation-sedimentation is currently the best practice of aquaculture wastewater treatment. This research aims to compare the performance of chemical-based (alum) and bio-based (neem leaves) coagulants in treating aquaculture effluent while also studying the economic feasibility. Alum showed higher removal efficiencies of total suspended solid (99.7%), turbidity (98.8%), and color (97.3%), while neem coagulant showed a lower dosage needed to achieve the optimum performance. The total cost included capital and operational costs, while total benefit included the potential of water reuse and reclaimed valuable products from sludge. The net profit reveals negative values for both scenarios, while cost-benefit ratio showed 0 and 0.06 values for alum and neem coagulants, respectively. These values indicated that both scenarios are not feasible to gain economical profit, while the utilization of neem coagulant present benefit for water reuse and sludge utilization. A deeper analysis using Social Return on Investment (SROI) method is suggested to include the non-traditional calculation in cost-benefit analysis such as social and environmental values of the scenarios.

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“…bauxite slag, 16 kaolin, 17 chromium(III) oxide, 18 microalgae, 19 and Porphyridium purpurem. 20 Additionally, it also possesses high capability for sludge dewatering treatment to effectively reduce bound water and optimize the fluidity. 21 In general, the flocculation performance of PAM is strongly dependent on the chain length of the polymer.…”

Section: Introductionmentioning

confidence: 99%

“…PAM as a flocculant has achieved efficient solid–liquid separation for various high turbid wastewater, e.g. bauxite slag, kaolin, chromium(III) oxide, microalgae, and Porphyridium purpurem . Additionally, it also possesses high capability for sludge dewatering treatment to effectively reduce bound water and optimize the fluidity .…”

Section: Introductionmentioning

confidence: 99%

Green Photocatalytic Route To Synthesize Cross-Linked Polyacrylamide Flocculant for Flocculation of High Turbid Wastewater

Shi,

Zhou,

Liu

et al. 2024

Ind. Eng. Chem. Res.

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As one of the most important flocculants, polyacrylamide (PAM)-based materials show enhanced capability to purify highly turbid wastewater by prolonging the length of molecular chains and modifying functional groups, which, however, generally involves complex synthetic procedures and expensive functional guests. In this study, exfoliated g-C 3 N 4 colloids (CNCs) were used as sunlight-driven photocatalysts to trigger the radical polymerization of acrylamide (AM) without adding any initiator. More importantly, the CNCs also acted as a cross-linker to prolong the PAM chain, thus promoting the flocculation of turbid water. The CNCs content in the CNCs/ PAM hybrid (CNPAM), hybrid dosage, and pH value were optimized. We further studied the effects of stirring speed and time as well as sedimentation time on the flocculation behavior. Under optimal conditions, the CNPAM flocculant could effectively flocculate kaolin suspension with a transmittance of >93%. The fractal dimension analysis indicated floc size increased with the enhancement of the CNC content in the CNPAM flocculant. It was testified that the flocculant had good universality for high turbid water in different concentrations and with the presence of various inorganic salts. This study demonstrates the photocatalysis of CNCs is a green, time-saving, and economical route to prepare crossing-linked CNPAM skeleton and that CNCs are promising efficient flocculants for the purification of high turbid wastewater.

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Harvesting Porphyridium purpureum using polyacrylamide polymers and alkaline bases and their impact on biomass quality

Cited by 15 publications

References 33 publications

A comparative analysis of algal biomass densification methods aimed at the biofuel production

A comparative analysis of algal biomass densification methods aimed at the biofuel production

Performance of Chemical-Based vs Bio-Based Coagulants in Treating Aquaculture Wastewater and Cost-benefit Analysis

Green Photocatalytic Route To Synthesize Cross-Linked Polyacrylamide Flocculant for Flocculation of High Turbid Wastewater

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