Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH
| Autor: | Rodrigo Nunes Oss, Sérvio Túlio Alves Cassini, Paulo Wagner Pereira Antunes, Sara Aparecida Francisco, Regina de Pinho Keller |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Flocculation Starch lcsh:Biotechnology chemistry.chemical_element Biomass 010501 environmental sciences 01 natural sciences complex mixtures anaerobic effluent chemistry.chemical_compound 010608 biotechnology lcsh:TP248.13-248.65 Botany Sulfate Effluent Wastewater quality indicators 0105 earth and related environmental sciences Multidisciplinary pH Phosphorus microalgae food and beverages Pulp and paper industry coagulation-flocculation chemistry Sewage treatment |
| Zdroj: | Brazilian Archives of Biology and Technology v.60 2017 Brazilian Archives of Biology and Technology Instituto de Tecnologia do Paraná (Tecpar) instacron:TECPAR Brazilian Archives of Biology and Technology, Vol 60, Iss 0 (2017) Brazilian Archives of Biology and Technology, Volume: 60, Article number: e17160174, Published: 30 MAR 2017 |
| Popis: | Harvesting is a critical step in microalgal biomass production process for many reasons. Among the existing techniques available for harvesting and dewatering microalgal biomass, recovery from aqueous medium by coagulation-flocculation has been the most economically viable process, althoughit is highly dependent on pH. This study aims to assess alternative coagulants compared to the standard coagulant aluminum sulfate for microalgal biomass recovery from anaerobic effluent of domestic sewage treatment. The effluent quality was also analyzed after biomass recovery. Coagulants represented by modified tannin, cationic starch and aluminum sulfate recovered more than 90% of algae biomass, at concentrations greater than 80 mg/L, in the pH range 7-10. Cationic starch promoted higher microalgal biomass recovery with a wider pH range. Powdered seeds of Moringa oleifera and Hibiscus esculentus(okra) gum promoted biomass removal of 50%, only in the acidic range of pH. After sedimentation of the microalgal biomass, the effluents showed a removal of >80% for phosphorus and nitrogen values and >50% for BOD and COD when using aluminum sulfate, cationic starch and modified tannin as coagulants. Natural organic coagulants in a wide pH range can replace aluminum sulfate, a reference coagulant in microalgal biomass recovery, without decreasing microalgal biomass harvesting efficiency and the quality of the final effluent. |
| Databáze: | OpenAIRE |
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