Journal
PROCESS BIOCHEMISTRY
Volume 50, Issue 9, Pages 1422-1428Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2015.05.021
Keywords
2,4,6-Trichlorophenol (2,4,6-TCP); Membrane bioreactor (MBR); Micro-polluted water resources; Nitrobenzene (NB); Powdered activated carbon (PAC); Trichloroethylene (TCE)
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Funding
- National Natural Science Foundation of China [51408149]
- Shenzhen Peacock Technique Funding Project [KQCX20120802095942112]
- Shenzhen Science and Technology Funding Project [JCYJ20140417172417160]
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Trace-organic contaminants elimination effectiveness and their removal pathways in a powder-activated carbon-membrane bioreactor (PAC-MBR) used for micro-polluted surface water treatment were investigated in this study. The results showed that PAC-MBR was capable of consolidating DOM elimination, enhancing trace-organic contaminants (2,4,6-trichlorophenol, nitrobenzene and trichloroethylene) removal efficiency, improving permeate biostability, and decreasing bulk organic content and specific fractional components, which was beneficial for membrane fouling mitigation. By series of well-designed batch-tests and estimation, trace-organics removal pathways were analyzed. The primary way of TCE removal was aeration volatilization, while that of NB and 2,4,6-TCP elimination was biodegradation which was greatly affected by biomass content within bulk. PAC addition was a positive way for effective trace-organics removal by increasing mixed solid adsorption capability, especially in start-up phase, and offering beneficial circumstances for biomass enrichment and functional bacteria accumulation. Thus, PAC addition into MBR is a simple and effective strategy to treat micro-polluted water resources. (C) 2015 Elsevier Ltd. All rights reserved.
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