Journal
BIORESOURCE TECHNOLOGY
Volume 219, Issue -, Pages 53-63Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.07.094
Keywords
Hydraulic retention time (HRT); C/N ratio; Leachate; Membrane bioreactor (MBR); Micro-pollutants; Enzyme activity
Funding
- Institute of Research and Development (IRD)
- Rajamangala University of Technology Thanyabuti (RMUTT)
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This research investigated the biodegradation of the micro-pollutants in leachate by the membrane bioreactor (MBR) system under six treatment conditions, comprising two C/N ratios (6, 10) and three hydraulic retention time (HRT) durations (6, 12, 24 h). The experimental results indicated that the C/N 6 environment was more advantageous to the bacterial growth. The bacterial communities residing in the sludge were those of heterotrophic bacteria (HB), heterotrophic nitrifying bacteria (HNB) and ammonia oxidizing bacteria (AOB). It was found that HB and HNB produced phenol hydroxylase (PH), esterase ( EST), phthalate dioxygenase (PDO) and laccase (LAC) and also enhanced the biodegradation rate constants (k) in the system. At the same time, AOB promoted the production of HB and HNB. The findings also revealed that the 12 h HRT was the optimal condition with regard to the highest growth of the bacteria responsible for the biodegradation of phenols and phthalates. Meanwhile, the longer HRT duration (i.e. 24 h) was required to effectively bio-degrade carbamazepine (CBZ), N, N-diethyl-m-toluamide (DEET) and diclofenac (DCF). (C) 2016 Elsevier Ltd. All rights reserved.
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