| Autor: |
Oliveira GA; Programa de Pós Graduação em Recursos Hídricos e Saneamento Ambiental, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil., Machado ÊL; Departamento de Química e Física, Universidade de Santa Cruz do Sul, Santa Cruz do Sul, Brazil., Knoll RS; Departamento de Engenharia, Arquitetura e Ciências Agrárias, Universidade de Santa Cruz do Sul, Santa Cruz do Sul, Brazil., Dell'Osbel N; Programa de Pós Graduação em Tecnologias Ambientais, Universidade de Santa Cruz do Sul, Santa Cruz do Sul, Brazil., Colares GS; Programa de Pós Graduação em Tecnologias Ambientais, Universidade de Santa Cruz do Sul, Santa Cruz do Sul, Brazil., Rodrigues LR; Programa de Pós Graduação em Recursos Hídricos e Saneamento Ambiental, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil. |
| Jazyk: |
angličtina |
| Zdroj: |
Environmental technology [Environ Technol] 2022 Apr; Vol. 43 (9), pp. 1370-1380. Date of Electronic Publication: 2020 Oct 06. |
| DOI: |
10.1080/09593330.2020.1830181 |
| Abstrakt: |
This study evaluated the performance of urban wastewater treatment in pilot-plant by an integrated system consisting of anaerobic reactor, microalgae cultivation, Venturi tube ozone recirculation, coagulation/flocculation with tannin-based agent natural coagulant, and dissolved air flotation (DAF). Ozone concentrations (without ozone, 0.13 and 0.25 mg O 3 /mg of biomass) and tannin dosages (65, 85 and 105 mg/L) were evaluated regarding microalgae separation and their influences on wastewater treatment performance. During the experiments, it was verified that the treatment efficiency increased when ozone was applied and with higher tannin dosages. The best results were found with 0.13 mg O 3 /mg of biomass and 105 mg/L of tannin, obtaining excellent removal of turbidity removal (99.4%), apparent colour at 420 nm (94.5%), TN (83.2%), N-NH 3 (100%), TOC (86.8%), BOD 5 (86.5%) and COD (100%), 47.6% reduction in electric conductivity, 46.1% in TDS, 66.4% TP removal for the integrated system and 84% microalgae biomass recovery were obtained. Our results showed that the system proved to be a viable alternative for the treatment of urban wastewater and the recovery of microalgae through the insertion of ozone via Venturi tube combined with tannin-based agent. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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