Coupling coagulation, flocculation and decantation with photo-Fenton process for treatment of industrial wastewater containing fipronil: Biodegradability and toxicity assessment
| Autor: | Jader O. Silva, Antonio E.H. Machado, Alam G. Trovó, Batuira M. da Costa Filho, Valdislaine M. Silva |
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| Rok vydání: | 2015 |
| Předmět: |
Biochemical oxygen demand
Flocculation Environmental Engineering Iron 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law Wastewater 01 natural sciences Waste Disposal Fluid Water Purification Industrial wastewater treatment Toxicology chemistry.chemical_compound Decantation Toxicity Tests Acute Animals Waste Management and Disposal Fipronil 0105 earth and related environmental sciences Biological Oxygen Demand Analysis 021110 strategic defence & security studies Chemistry Chemical oxygen demand General Medicine Hydrogen Peroxide Acute toxicity Biodegradation Environmental Pyrazoles Artemia Oxidation-Reduction Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Journal of environmental management. 174 |
| ISSN: | 1095-8630 |
| Popis: | This work reports the treatment of wastewater containing the insecticide fipronil, integrating coagulation, flocculation and decantation in the photo-Fenton process. Under the best concentration of the coagulant - Fe(3+) (56 mg L(-1)), the suspended solids and total fipronil concentrations decreased respectively from 7000 and 20.9 mg L(-1) to 590 and 2.2 mg L(-1), but without reduction in dissolved organic carbon - DOC (1760 mg C L(-1)) and acute toxicity to Artemia salina (100%). Subsequently, the photo-Fenton process was applied as alternative of pre- or complete treatment, taking into account toxicity and biodegradability (given by biochemical oxygen demand after five days - BOD5/chemical oxygen demand - COD ratio) assessment. The best DOC and COD removal were reached with 60 and 6723 mg L(-1) of Fe(2+) and H2O2, respectively. Under these conditions, after 60 min of irradiation, 57% of DOC and 74% of COD were removed, with a decrease in acute toxicity to A. salina from 100% to 13% and an increase in the BOD5/COD ratio from 0.052 to 1.0. With these parameters, the integration of coagulation/flocculation/decantation and photo-Fenton processes may be an alternative to the pre- or complete treatment of wastewater containing fipronil. |
| Databáze: | OpenAIRE |
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