Interference of model wastewater components with flocculation of Chlorella sorokiniana induced by calcium phosphate precipitates

Autor(es)

Leite, Luan de Souza ^{[1, 2]} ; Daniel, Luiz Antonio ^[1] ; Pivokonsky, Martin ^[3] ; Novotna, Katerina ^[3] ; Branyikova, Irena ^[4] ; Branyik, Tomas ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat, Ave Trabalhador Sao Carlense 400, BR-1356659 Sao Carlos, SP - Brazil

^[2] Univ Chem & Technol Prague, Dept Biotechnol, Tech 5, Prague 16628 - Czech Republic

^[3] Czech Acad Sci, Inst Hydrodynam, Patankou 30-5, Prague 16612 6 - Czech Republic

^[4] Czech Acad Sci, Inst Chem Proc Fundamentals, Rozvojova 2-135, Prague 16502 6 - Czech Republic

• Tipo de documento: Artigo Científico
• Fonte: Bioresource Technology; v. 286, AUG 2019.
• Citações Web of Science: 3

Resumo

Amongst harvesting processes, alkaline flocculation stands out as a technically feasible and low cost method. The interference of model wastewater components with alkaline flocculation of Chlorella sorokiniana (pH 8-12), induced by calcium phosphate (CaP) precipitates, was evaluated. Between the compounds tested, inorganic nitrogen, sodium alginate, salinity and algal organic matter had no effect on flocculation efficiency (FE). The negative effect of humic acids, sodium dodecyl sulphate and alkalinity on FE was partial. Bovine serum albumin and bacterial organic matter (BOM) of Escherichia coll. showed the strongest disruption of FE. The impact of BOM can be explained by the high protein content (65% of total organic carbon). Proteins, negatively charged at alkaline pH, interrupt microalgae flocculation by preferentially interacting with positively charged CaP precipitates. The simultaneous effects of multiple substances were tested to simulate real wastewater. The results confirm the need to investigate the composition of wastewater prior to alkaline flocculation. (AU)

• Processo FAPESP: 18/01218-3 - Mecanismo envolvido na floculação alcalina de Chlorella sorokiniana e sua validação em água negra
• Beneficiário: Luan de Souza Leite
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado