Optimal policies for activated sludge treatment systems with multi effluent stream generation

Autor(es)

R. Gouveia ^[1] ; J.M. Pinto ^[2]

Afiliação do(s) autor(es)

^[1] University of São Paulo. Department of Chemical Engineering - Brasil

^[2] University of São Paulo. Department of Chemical Engineering - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Chemical Engineering; v. 17, p. 979-990, 2000-12-00.

Resumo

Most industrial processes generate liquid waste, which requires treatment prior to disposal. These processes are divided into sectors that generate effluents with time dependent characteristics. Each sector sends the effluent to wastewater treatment plants through pumping-stations. In general, activated sludge is the most suitable treatment and consists of equalization, aeration and settling tanks. During the treatment, there is an increase in the mass of microorganisms, which needs to be removed. Sludge removal represents the major operating costs for wastewater treatment plants. The objective of this work is to propose an optimization model to minimize sludge generation using a superstructure in which the streams from pumping-stations can be sent to the equalization tank. In addition, the aeration tank is divided into cells that can be fed in series and parallel. The model relies on mass balances, kinetic equations, and the resulting Nonlinear Programming problem generates the best operational strategy for the system feed streams with a high substrate removal. Reductions of up to 30 % can be achieved with the proposed strategy maintened BOD efficiency removal upper than 98 %. (AU)

• Processo FAPESP: 99/05575-2 - Otimização da operação e projeto de estações de tratamento de efluentes líquidos industriais por lodos ativados
• Beneficiário: Ricardo de Gouveia
• Modalidade de apoio: Bolsas no Brasil - Doutorado