Title: Valorisation of a wastewater in the treatment of leachate from municipal solid waste in Morocco

Authors: Meriem Abouri; Abdelhakim Elmaguiri; Salah Souabi; M. Abdelaazize Aboulhassan

Addresses: Laboratory of Process Engineering and Environment, Faculty of Science and Technics of Mohammedia, Hassan II University, Morocco ' Laboratory of Process Engineering and Environment, Faculty of Science and Technics of Mohammedia, Hassan II University, Morocco ' Laboratory of Process Engineering and Environment, Faculty of Science and Technics of Mohammedia, Hassan II University, Morocco ' Laboratory of Environmental Engineering and Biotechnology, ENSA, University Ibn Zohr, PO Box 1136, 80000 Agadir, Morocco

Abstract: In most countries, sanitary landfilling is the common way to dispose municipal solid wastes. In general, leachate treatment is a difficult and expensive process. Although; leachate can be treated by biological processes, chemical oxygen demand removal efficiency is usually low due to high ammonium ion content and the presence of toxic compounds such as metal ions. This experimental study was conducted to investigate the effect of coagulation-flocculation process on the fresh leachate resulting from compacting of solid waste of Mohammedia city. The effects of steel industry wastewater (SIWW) rich in Fe³⁺ and commercial coagulant ferric chloride of 40% with various dosages and also coagulation pH on the removal of turbidity, colour, chemical oxygen demand (COD), biological oxygen demand (BOD₅) and total suspended solids were studied. Based on the results of this study, the best coagulant for colour and turbidity removal was SIWW. An equivalent of 7,080 mg.L⁻¹ of FeCl₃ was needed to effectively remove 63% of turbidity. This liquid waste can remove 44.5% of COD at the concentration equal to 1,000 mg.L⁻¹ of FeCl₃. The physico-chemical process may be used as an effective pre-treatment process, especially for fresh leachate, prior to post-treatment (polishing) for partially stabilised leachate.

Keywords: coagulation flocculation treatment; fresh leachate; municipal solid waste; steel industry wastewater; SIWW; Morocco.

DOI: 10.1504/IJEWM.2019.096544

International Journal of Environment and Waste Management, 2019 Vol.23 No.1, pp.27 - 39

Accepted: 30 Apr 2018
Published online: 05 Dec 2018 *

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