期刊
BIORESOURCE TECHNOLOGY
卷 240, 期 -, 页码 25-32出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.02.052
关键词
Sodium hydroxide; Membrane fouling; Ceramic membrane; Anaerobic membrane bioreactor; Domestic wastewater
资金
- National University of Singapore
- National Science Foundation of China [51678423]
- China Scholarship Council (CSC)
- Shanghai Tongji Gao Tingyao Environmental Science and Technology Development Foundation (STGEF)
In this study, a chemically enhanced backflush (CEB) cleaning method using NaOH solution was proposed for fouling mitigation in anaerobic membrane bioreactors (AnMBRs). Ex-situ cleaning tests revealed that NaOH dosages ranging from 0.05 to 1.30 mmol/L had positive impacts on anaerobic biomass, while higher dosages (>1.30 mmol/L) showed inhibition and/or toxic impacts. In-situ cleaning tests showed that anaerobic biomass could tolerate much higher NaOH concentrations due to the alkali consumption by anaerobic process and/or the buffering role of mixed liquor. More importantly, 10-20 mmol-NaOH/L could significantly reduce membrane fouling rates (4-5.5 times over the AnMBR with deionized water backflush) and slightly improve methanogenic activities. COD removal efficiencies were over 87% and peaked at 20 mmol-NaOH/L. However, extremely high NaOH concentration had adverse effects on filtration and treatment performance. Economic analysis indicated that 12 mmol/L of NaOH was the cost-efficient and optimal fouling-control dosage for the CEB cleaning. (C) 2017 Elsevier Ltd. All rights reserved.
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