微絮凝预处理对超滤膜不同溶解有机物污染的影响

IF 2.3 Q2 Environmental Science Journal of Water Reuse and Desalination Pub Date : 2021-09-24 DOI:10.2166/wrd.2021.051
Lan-Yang Ren, Chen Liu, Ting Meng, Yingxue Sun
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引用次数: 9

摘要

研究了微絮凝预处理对处理后废水中有机物引起的超滤膜污染的影响。采用腐植酸、黄腐酸和海藻酸钠三种典型溶解有机质(DOM)模拟膜污染。结果表明,以聚合氯化铝(PAC)或聚合硫酸铁(PFS)为絮凝剂进行微絮凝处理可有效提高超滤工艺对DOM的处理性能。当PAC浓度为6 mg/L时,微絮凝联合UF工艺对腐植酸、黄腐酸和海藻酸钠的去除率分别达到79.95%、63.25%和51.14%。具体来说,微絮凝后,微分子亲水有机物(如黄腐酸)趋向于形成致密的饼状层。大分子疏水有机物(如腐植酸)和亲水有机物(如海藻酸钠)一般导致松散的饼层。PAC用量为6 mg/L时,腐植酸、海藻酸钠和黄腐酸溶液的膜比通量(J/J0)较单独UF处理分别提高了11.71%、10.27%和2.2%。由此可见,微絮凝预处理在处理含腐植酸、海藻酸钠和黄腐酸的废水时,能有效缓解膜污染。
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Effects of micro-flocculation pretreatment on the ultrafiltration membrane fouling caused by different dissolved organic matters in treated wastewater
This study investigated the efficacy of using micro-flocculation as a pretreatment approach in alleviating ultrafiltration (UF) membrane fouling caused by organic matter in treated wastewater. Three typical model dissolved organic matters (DOM), humic acid, fulvic acid, and sodium alginate, were employed to simulate membrane fouling. The results showed that micro-flocculation using poly aluminum chloride (PAC) or polymerized ferric sulfate (PFS) as flocculant could effectively enhance the treatment performance of the UF process on DOM. With 6 mg/L PAC, the removal efficiency of humic acid, fulvic acid, and sodium alginate by micro-flocculation combined UF process reached 79.95%, 63.25%, and 51.14%, respectively. Specifically, after micro-flocculation, micromolecular hydrophilic organic matter (e.g., fulvic acid) tended to form a compact cake layer. The macromolecular hydrophobic organic matter (e.g., humic acid) and macromolecular hydrophilic organic matter (e.g., sodium alginate) generally led to a loose cake layer. At PAC dosage of 6 mg/L, the membrane specific flux (J/J0) at the end was improved by 11.71%, 10.27%, and 2.2% for humic acid, sodium alginate and fulvic acid solutions, respectively, compared with the UF process alone. It could be inferred that micro-flocculation pretreatment can effectively mitigate the membrane fouling when treating wastewater containing humic acid, sodium alginate, or fulvic acid.
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来源期刊
Journal of Water Reuse and Desalination
Journal of Water Reuse and Desalination ENGINEERING, ENVIRONMENTAL-WATER RESOURCES
CiteScore
4.30
自引率
0.00%
发文量
23
审稿时长
16 weeks
期刊介绍: Journal of Water Reuse and Desalination publishes refereed review articles, theoretical and experimental research papers, new findings and issues of unplanned and planned reuse. The journal welcomes contributions from developing and developed countries.
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