Evaluation of the Treatability of Municipal Waste Landfill Leachate in a SBR and by Coagulation-Flocculation on a Bench Scale

Abstract

-This article describes bench scale sequential, biological and coagulation-flocculation treatment of mature leachate for the removal of nitrogen and biodegradable and recalcitrant carbonaceous material. The biological stage was conducted on two SBRs, one of which inoculated with nitrifying sludge, another without an inoculum, for 152 and 133 days, respectively. The coagulation-flocculation stage used four coagulants at different doses and pH adjustments. The treatment conducted on the inoculated SBR when a pH control was used produced mean removals of BOD 5 , COD and TKN of 69.6%, 38.5% and 51.6%, respectively, and practically complete denitrification. Coagulation-flocculation applied to the effluent of the inoculated biological reactor showed a superior effectiveness of the ferric coagulants, when the pH was adjusted to close to 6.0, producing removals of turbidity, COD and true color close to 95%, 78% and 92%, respectively.

Environmental pollution size of the Bishkek Solid Waste Landfill and treatment of generated leachate wastewater

“…The removal mechanisms of organic compounds in the leachate in the CF process could be charge adsorption-neutralization and MJEN MANAS Journal of Engineering, Volume 9 (Issue 2) © 2021 www.journals.manas.edu.kg complexation followed by precipitation. Other researchers have also reported similar results regarding treatment by the CF process of landfill leachate [11,13,14]. Amount of produced sludge (after dried at 105 o C, 24 hour) at coagulant dose of 500, 1000, 2000, 4000 and 5000 mg/L was 1.42, 2.38, 2.26 and 2.75 g/L for alum and 1.49, 2.12, 2.53 and 3.96 g/L for FeCl3, respectively.…”

“…Coagulation-flocculation (CF) is a simple process used to treat landfill leachate [11]. This process has been widely used in the pre-or post-treatment of landfill leachate to enhance the biodegradability of leachate or to remove organic matters (especially refractory organics) to reduce the pollution load of wastewater [12].…”