Journal Article10.1016/J.JWPE.2019.100947
Coagulation and dissolved air flotation as a harvesting method for microalgae cultivated in wastewater
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TL;DR: In this article, coagulation followed by dissolved air flotation (DAF) was used as a harvesting method for Chlorella sorokiniana cultivated in wastewater, and the harvesting performance was evaluated using four coagulants (aluminum sulphate, ferric chloride, Tanfloc SG and Zetag 8185) usually used in water or wastewater treatment.
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Abstract: Microalgae harvesting is the major bottleneck for biomass production on a large-scale. In this study, coagulation followed by dissolved air flotation (DAF) was used as a harvesting method for Chlorella sorokiniana cultivated in wastewater. The harvesting performance was evaluated using four coagulants (aluminum sulphate, ferric chloride, Tanfloc SG and Zetag 8185) usually used in water or wastewater treatment. All coagulants tested showed high flotation efficiency at different conditions of dosage, pH and flotation velocity. The optimal doses were 10 mg L−1 Zetag 8185; 75 mg L−1 Tanfloc SG; 500 mg L−1 Al2(SO4)3, and 1000 mg L−1 FeCl3 at pH 7, which showed the maximum efficiency of 98.4, 94.5, 95.4, 96.7% at 8 cm·min−1, respectively. Moreover, the photobioreactor effluent quality significantly improved after harvesting tests using the optimal doses. High removal was reached for turbidity (93.7–96.2 %), apparent color (91.7–92.3 %), TKN (90.2–92.6%), total phosphorus (89.4–90.9 %) and TSS (88.6–92.5 %). The use of metal salts requires caution due to the high residual concentration of iron and aluminum in the final effluent.
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Citations
Microalgae cultivation in wastewater and potential processing strategies using solvent and membrane separation technologies
Nurul Syahirah Mat Aron,Kuan Shiong Khoo,Kit Wayne Chew,Ashokkumar Veeramuthu,Jo Shu Chang,Jo Shu Chang,Pau Loke Show +6 more
TL;DR: The insights from cultivating microalgae in wastewater sources and the promising technologies to convert them into useful bioproducts will be beneficial to the developments of future upstream and downstream processes.
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Phyco-remediation of swine wastewater as a sustainable model based on circular economy.
Itzel Y. López-Pacheco,Arisbe Silva-Núñez,J. Saúl García-Pérez,Danay Carrillo-Nieves,Carmen Salinas-Salazar,Carlos Castillo-Zacarías,Samson Afewerki,Damià Barceló,Hafiz N.M. Iqbal,Roberto Parra-Saldívar +9 more
TL;DR: This work presents an overview of the technological applications of microalgae for the treatment of wastewater from swine farms and the by-products and services of commercial interest generated during this process.
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Synergistic effect of dual flocculation between inorganic salts and chitosan on harvesting microalgae Chlorella vulgaris.
TL;DR: In this paper, the flocculation efficiency of microalgae Chlorella vulgaris for subsequent harvesting was investigated using single flocculants of inorganic salts, synthetic polymer, chitosan and dual flocculusants of both inorganic and chitusan.
Autochthonous microalgae grown in municipal wastewaters as a tool for effectively removing nitrogen and phosphorous
Serena Lima,Valeria Villanova,Franco Grisafi,Giuseppe Caputo,Alberto Brucato,Francesca Scargiali +5 more
TL;DR: In this article, four different microalgal strains (two from culture collections and two isolated from Sicilian littoral) were tested in municipal sewage bioremediation, and the results showed that micro-gal treatment alone is not effective in reducing COD and BOD, while all the tested strains were able to significantly reduce wastewater TN and TP.
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Microalgae harvesting from wastewater by pH modulation and flotation: Assessing and optimizing operational parameters.
TL;DR: The results showed the pH modulation and DAF as an effective process for wastewater treatment and biomass harvesting and indicated the importance of operational optimization, not studied until now, in which the achieved results could be potentially applied as practical guidelines for microalgae harvesting on a large scale.
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References
Effective harvesting of microalgae by coagulation-flotation.
TL;DR: Algal cells characterization results showed that the combined use of CTAB and Al3+ largely enhanced the algal floc size, and exhibited higher degree of hydrophobicity, which favoured the flotation, and can be interpreted by DLVO (Derjaguin, Landau, Verwey and Overbeek) modelling.
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An Algal Removal using a Combination of Flocculation and Flotation Processes
TL;DR: It was generally found, in this study, that an addition of the polyelectrolyte improved the removal efficiencies and the rate of separation and also decreased the amount of the associated water removed along with the algal sludge.
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Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH
Sérvio Túlio Alves Cassini,Sara Aparecida Francisco,Paulo Wagner Pereira Antunes,Rodrigo Nunes Oss,Regina de Pinho Keller +4 more
TL;DR: In this paper, the authors assess alternative coagulants compared to the standard coagulation-flocculation for microalgal biomass recovery from anaerobic effluent of domestic sewage treatment.
Sewage treatment by anaerobic biological process associated with dissolved air flotation.
TL;DR: This paper presents the results of a study performed with a lab-scale batch DAF unit fed with previously coagulated (with FeCl3 or cationic polymer) effluent from a pilot scale up-flow anaerobic sludge blanket (UASB) reactor treating domestic sewage.
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