YUHai-kuan,LIXing,ZHOUZhi-wei,et al.Pollutants Removal Efficiency of Pretreatment Process and Its Membrane Fouling Behaviors in a Large-scale Ultrafiltration Water Treatment Plant[J].China Water & Wastewater,2023,39(13):54-59.
大型超滤水厂预处理流程的除污效能及膜污染特性
- Title:
- Pollutants Removal Efficiency of Pretreatment Process and Its Membrane Fouling Behaviors in a Large-scale Ultrafiltration Water Treatment Plant
- Keywords:
- ultrafiltration; pretreatment process; pollutants removal efficiency; dissolved organic matter; membrane fouling
- 摘要:
- 预处理流程是提高超滤组合工艺除污效能、控制膜污染的关键环节，在实际工程应用中具有重要作用。对比了长期运行的大型超滤水厂中两种预处理流程的除污效能和膜污染特性。结果表明，常规流程+超滤工艺和短流程/炭泥回流+超滤工艺都有较好的有机物去除效果，出水以分子质量<3 ku的DOC为主，出水水质均满足《生活饮用水卫生标准》（GB 5749—2006）；预处理流程中投加粉末活性炭、设砂滤单元可有效改善膜前水水质，提升水质稳定性，降低膜阻力、缓解膜污染，减小超滤单元的运行负荷。两种工艺的预处理流程均可有效去除类芳香族蛋白质、类芳香族蛋白质Ⅱ和分子质量<1 ku的DOC，超滤单元均可去除类腐殖酸、溶解性微生物代谢类蛋白质和分子质量>30 ku的DOC；分子质量<3 ku的DOC与类芳香族蛋白质、类腐殖酸是造成膜孔阻力的主要因素，>100 ku和3～10 ku的DOC与类芳香族蛋白质、类芳香族蛋白质Ⅱ以及溶解性微生物代谢类蛋白质是造成滤饼层阻力的主要因素。
- Abstract:
- The pretreatment process is the key link to improve the pollutants removal efficiency and control membrane fouling of combined ultrafiltration process, and plays an important role in practical engineering application. This paper compared the pollutants removal efficiency and membrane fouling behaviors of two pretreatment processes in a large-scale ultrafiltration water treatment plant during long-term operation. The conventional process combined with ultrafiltration process and the short process with carbon sludge reflux combined with ultrafiltration process both showed good organic matter removal performance. The organic matter in the effluent was mainly DOC with molecular weight (MW) less than 3 ku, and the effluent quality met the requirement specified in Standards for Drinking Water Quality (GB 5749-2006). Adding powdered activated carbon and setting sand filter unit in the pretreatment process effectively improved the water quality before membrane filtration, enhanced the stability of water quality, reduced membrane resistance, alleviated membrane fouling, and reduced the operating load of the subsequent ultrafiltration unit. The two pretreatment processes effectively removed the aromatic protein， aromatic protein Ⅱ, DOC with MW less than 1 ku, and the ultrafiltration unit was capable of removing humic acid, dissolved microbial metabolic protein and DOC with MW greater than 30 ku. DOC with MW less than 3 ku, aromatic protein and humic acid were the main factors causing membrane pore resistance, and DOC with MW in the ranges of >100 ku and 3-10 ku, aromatic protein, aromatic protein Ⅱ and dissolved microbial metabolic proteins were the main factors causing cake layer resistance.
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