Transformation of dissolved organic matters in landfill leachate-bioelectrochemical system
Journal
Bioresource Technology
Journal Volume
191
Pages
350-354
Date Issued
2015
Author(s)
Abstract
A membraneless bioelectrochemical system (BES) reactor and an anoxic/oxic (A/O) reactor of identical configurations were applied to treat the landfill leachate (20,100mgl-1 chemical oxygen demand (COD) and 1330mgl-1 NH4 +-N) at 24-h hydraulic retention time and 3kgchemical oxygen demandm-3d-1 volume loading. The BES with maximum power density of 2.77¡Ó0.26Wm-3 and internal resistance of 47.5¡Ó1.4£[ removed 84-89% COD and 94-98% NH4 +-N, 11% and 47%, respectively, higher than the A/O reactor. The dissolved organic matters (DOM) in effluents from the BES and the A/O reactor were for the first time characterized and compared. The MFC preferentially degraded hydrophilic fraction (HPI) of the fed DOM and yielded excess humin with high aromaticity. The electric fields by bioelectrochemical reactions occurred at cathode stimulate the activities of COD degraders and nitrifiers in biofilms to enhance ammonium removals by BES reactor. ? 2015 Elsevier Ltd.
Subjects
Anoxic/oxic
Dissolved organic matter
Fractionation
Landfill leachate
Microbial fuel cell
Type
journal article