Variables in the process of coagulation / flocculation / settling of leachate of municipal landfills

  • Victor Fernandes Bezerra Mello Universidade Federal de Pernambuco
  • Juliana Prazeres da Gama Abreu Universidade Federal de Pernambuco
  • Joelma Morais Ferreira Universidade Federal de Pernambuco
  • José Fernando Thomé Jucá Universidade Federal de Pernambuco
  • Maurício Alves da Motta Sobrinho Universidade Federal de Pernambuco
Keywords: sanitary landfill, leachate, coagulation, flocculation

Abstract

The careless disposal of waste may generate tremendous environmental and social impacts. For the treatment of landfill leachate, biological and physic-chemical treatments are routinely used. Chemical precipitation using calcium hydroxide has been used with great effectiveness in treating effluent with high concentrations of organic compounds and heavy metals. The leachate used in this study was collected from a flow box of the Muribeca landfill, located in the city of Jaboatão Guararapes, PE. Commercial calcium hydroxide was used as coagulant in aqueous solution. The experiment was implemented using a fractional factorial design, followed by a complete planning 24. It was observed that the lowest turbidity and color were obtained at the highest flocculation speeds. Color removal was favored by long flocculation time whereas this did not occur for turbidity removal. For the optimal point, a reduction of 52% of the color and a NTU turbidity within the standards established in Brazilian Laws (CONAMA 357/05 and CONAMA 430/11) were obtained.

Author Biography

Maurício Alves da Motta Sobrinho, Universidade Federal de Pernambuco
Possui graduação em Engenharia Quimica pela Universidade Católica de Pernambuco (1992), mestrado em Engenharia Química pela Universidade Federal de Campina Grande (1995) e doutorado em Engenharia de Processos pelo Institut National Polytechnique de Lorraine (2001). Atualmente é professor adjunto do Departamento de Engenharia Química da Universidade Federal de Pernambuco. Revisor das revistas Water Research, Journal of Chemometrics e Brazilian Journal of Chemical Engineering. Consultor da Fundação de Amparo a Pesquisa do Estado do Amazonas. Tem experiência na área de Engenharia Química e Engenharia Ambiental, com ênfase em Tratamento de Água, de Efluentes e de Resíduos Sólidos assim como em Gestão Ambiental. Atua principalmente nos seguintes temas: tratamento de efluentes, água e solos, analise de imagem, adsorção, análise de imagem e gestão.
Published
24/08/2012
Section
Papers