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https://ir.swu.ac.th/jspui/handle/123456789/13350| Title: | Effects of hydraulic retention time and carbon to nitrogen ratio on micro-pollutant biodegradation in membrane bioreactor for leachate treatment |
| Authors: | Boonnorat J. Techkarnjanaruk S. Honda R. Prachanurak P. |
| Keywords: | Bacteria Bioconversion Bioreactors Carbon Enzyme activity Enzymes Esters Leachate treatment Nitrification Phenols Pollution Potassium compounds Rate constants C/N ratio Hydraulic retention time Leachates Membrane bio reactor (MBR) Micropollutants Biodegradation 2,6 di tert butylphenol 4,4' isopropylidenediphenol carbamazepine carbon diclofenac diethyltoluamide dioxygenase endocrine disruptor esterase laccase nitrogen oxygenase pesticide phenol derivative phenol hydroxylase phthalate dioxygenase phthalic acid unclassified drug artificial membrane carbon nitrogen sewage water pollutant bacterium biodegradation bioreactor carbon isotope enzyme activity experimental study growth rate isotopic ratio leachate microbial activity nitrogen isotope pollutant waste treatment water retention ammonia oxidizing bacterium Article biodegradation hydraulic retention time leaching membrane reactor microbial community nitrifying bacterium nonhuman pollutant priority journal sludge time artificial membrane bacterium bioreactor bioremediation denaturing gradient gel electrophoresis heterotrophy isolation and purification kinetics metabolism microbiology nitrification polyacrylamide gel electrophoresis polymerase chain reaction real time polymerase chain reaction sewage time factor water pollutant Bacteria (microorganisms) Nitrosomonadales Bacteria Biodegradation, Environmental Bioreactors Carbon Denaturing Gradient Gel Electrophoresis Electrophoresis, Polyacrylamide Gel Heterotrophic Processes Kinetics Membranes, Artificial Nitrification Nitrogen Polymerase Chain Reaction Real-Time Polymerase Chain Reaction Sewage Time Factors Water Pollutants, Chemical |
| Issue Date: | 2016 |
| Abstract: | 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). © 2016 Elsevier Ltd |
| URI: | https://ir.swu.ac.th/jspui/handle/123456789/13350 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84979774564&doi=10.1016%2fj.biortech.2016.07.094&partnerID=40&md5=7518d7228abf73bbf73c1bdd1cc68fb5 |
| ISSN: | 9608524 |
| Appears in Collections: | Scopus 1983-2021 |
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