Alkali-assisted membrane cleaning for fouling control of anaerobic ceramic membrane bioreactor
| Autor: | How Yong Ng, Zhiwei Wang, Pei Jun Quek, Xiaojie Mei |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Ceramics
Environmental Engineering Anaerobic respiration 0208 environmental biotechnology Bioengineering 02 engineering and technology Alkalies 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Water Purification Bioreactors fluids and secretions Bioreactor Anaerobiosis Waste Management and Disposal 0105 earth and related environmental sciences Fouling mitigation Chromatography Fouling Renewable Energy Sustainability and the Environment Chemistry Membrane fouling food and beverages Membranes Artificial General Medicine Backflush accounting 020801 environmental engineering stomatognathic diseases Ceramic membrane Anaerobic exercise |
| Zdroj: | Bioresource Technology. 240:25-32 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2017.02.052 |
| Popis: | 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 1.30mmol/L had positive impacts on anaerobic biomass, while higher dosages (>1.30mmol/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, 10-20mmol-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 20mmol-NaOH/L. However, extremely high NaOH concentration had adverse effects on filtration and treatment performance. Economic analysis indicated that 12mmol/L of NaOH was the cost-efficient and optimal fouling-control dosage for the CEB cleaning. |
| Databáze: | OpenAIRE |
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