Abstracts - peq / coppe / ufrj

Advanced Oxidation Process, Microfiltration and Nanofiltration for Treatment ofLandfill LeachateLarissa M. Diniz 1 , Laura H. Andrade 1 *, Marco A. Herculano 1 , Eghon P. Rocha 1 , Thiago L.Massula 1 , Míriam C. S. Amaral 1 , Liséte C. Lange 11 Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais.* Corresponding author: Av. Antônio Carlos, nº 6627 - Pampulha - Belo Horizonte – Minas Gerais –Brazil. Telephone: +55 (31) 34093669; Fax: +55 (31) 34091879; Email: lauraha@ymail.comThe treatment of sanitary landfill leachate is a problem in many countries. The existence ofincreasingly restrictive standards regarding the discharge of effluents on water bodies and the agingof landfills cause the conventional treatments not to provide adequate removal efficiencies anymore[1]. In this scenario, membrane technology and advanced oxidation processes appear as promisingtechnologies.The aim of this study was to evaluate the performance of a treatment system constituted ofadvanced oxidation process (AOP), microfiltration (MF) and nanofiltration (NF) for advanced landfillleachate treatment.In the proposed system (Figure 1), raw leachate was initially microfiltrated (MF1). The concentrate ofMF1 underwent the AOP-Fenton process and subsequently, a second MF for sludge removal (MF2).Permeates from both MF1 and MF2 were mixed and sent to a nanofiltration unit (NF). The permeatefrom the NF consisted of treated effluent, and the concentrated returned to the AOP-Fenton stage.Figure 1 - Scheme of the proposed treatment system for landfill leachate.The AOP-Fenton reaction was performed with the following operational conditions: 1.7g H2O2/1gCODraw leachate, [H2O2]/[Fe] molar ratio of 13, pH of 3.0 and reaction time of 30 minutes. MF1 wasperformed using a sidestream module (0,072 m²), and MF2, a submerged module (0,044 m²). Bothmodules were hollow-fiber type, made of polyetherimide, with average pore diameter of 0.4 µm. TheNF membrane used was the commercial NF90, which was cut and inserted into a filtration cell(0.0062 m²). A recovery rate of 60% was applied for all membrane process.To evaluate the proposed treatment system, the raw and treated effluent and intermediate streamswere analyzed in terms of COD, apparent color, total solids, ammonia nitrogen (N-NH3), totalphosphorus and chloride concentrations. For assessment of the stages with membranes, thepermeate flow decay was monitored during filtration time.