Definição de alternativas de pré-tratamento de efluentes não domésticos em sistemas públicos de esgotos, utilizando o teste de avaliação da toxicidade refratária. / Definition of petreatment alternatives to non domestic effluent in public owned treatment works (POTWs), using the refractory toxicity assessment test (RTA).

AUTOR(ES)

Roseli Dutra Spósito

DATA DE PUBLICAÇÃO

2006

RESUMO

Typically, the cause of effluent aquatic toxicity is unknown. Due to this and the complex makeup and varying toxicants in individual waste streams, a toxicity reduction program must usually begin at the discharge and proceed upstream to find the source. The key toxicant(s) and the actual toxic mechanism are normally not apparent from traditional characterization data and may consist of refractory organics or by-products generated in biological treatment process. Due to the complex interaction between toxicants, threshold concentration for specific compounds cannot be universally applied. The research work was carried out to identify classes of pollutants from chemical industry effluent that causes toxicity and inhibition at Suzano Wastewater Treatment Plant (Suzano WTP), a conventional activated sludge process, located at São Paulo Metropolitan Region and to suggest based on results, pretreatment technologies to this wastewater. Methods applied in effluent treatment scenarios (e.g., air stripping, powdered carbon, coagulation, flocculation and sedimentation) and Refractory Toxicity Assessment (RTA) according Ferraresi (2001) were used. A reactor simulated the real condition of Suzano WTP and two others, future condition with maximum flow rate of treated industrial wastewater and minimum flow rate of sewage. Volatile compounds, adsorbed and particulate material present in industrial effluent caused inhibition in activated sludge process and effluent WTP toxicity. Thus, air stripping, carbon adsorption and coagulation, flocculation and sedimentation or air dissolved flotation were efficient technologies to pretreat this industrial effluent.

ASSUNTO(S)

pretreatment non domestic effluent toxicity efluente não doméstico pré-tratamento toxicidade

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