Coagulation–flocculation process for landfill leachate pretreatment and optimization with response surface methodology. Issue 31 (2nd July 2016)

• Record Type: Journal Article
• Authors: Smaoui, Yosr; Chaabouni, Moncef; Sayadi, Sami; Bouzid, Jalel
• Is Part Of: Desalination and water treatment. Volume 57:Issue 31(2016)
• Page Start: 14488
• Page End: 14495
• Publication Date: 2016-07-02
• Subjects: Landfill leachate -- Pollutants -- COD removal -- Coagulation–flocculation -- Response surface methodology -- Hybrid design; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2015.1067837
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: The present paper aimed to characterize and treat a landfill leachate using a coagulation–flocculation process. The leachate was obtained from a landfill in the city of Sousse, Tunisia. Its physicochemical characterization showed high levels of chemical oxygen demand (COD), ammonium, and heavy metal contents. The coagulation–flocculation process was applied as pretreatment effluent to reduce these pollutants. The key operating parameters (pH, coagulant dose, flocculant dose, and mixing speed in the flocculation step) on the coagulation–flocculation process were optimized using response surface methodology to investigate COD removal in landfill leachate. In this regard, a hybrid design was carried out to seek optimal conditions which were as follows: pH: 3.36; concentration of coagulant: 0.87 g/l; concentration of flocculant: 26 mg/l; and mixing speed: 48 rpm. These conditions have been proved experimentally.