State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China; Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore 117576, Singapore.
Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore 117576, Singapore.
Bioresour Technol. 2017 Sep;240:25-32. doi: 10.1016/j.biortech.2017.02.052. Epub 2017 Feb 16.
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.
在这项研究中，提出了一种使用 NaOH 溶液的化学增强反冲洗（CEB）清洁方法，以减轻厌氧膜生物反应器（AnMBR）中的污染。 现场清洗测试表明，NaOH 剂量范围为 0.05 至 1.30mmol/L 对厌氧生物量具有积极影响，而更高的剂量（>1.30mmol/L）则表现出抑制和/或毒性影响。 现场清洗测试表明，由于厌氧过程消耗碱和/或混合液的缓冲作用，厌氧生物量可以耐受更高的 NaOH 浓度。 更重要的是，10-20mmol-NaOH/L 可以显著降低膜污染速率（比用去离子水反冲洗的 AnMBR 高 4-5.5 倍），并略微提高产甲烷活性。COD 去除效率超过 87%，在 20mmol-NaOH/L 时达到峰值。 然而，极高的 NaOH 浓度会对过滤和处理性能产生不利影响。 经济分析表明，12mmol/L 的 NaOH 是 CEB 清洁的具有成本效益和最佳的防污控制剂量。
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