某工业水厂用水端反渗透膜堵塞原因及对策

Reasons and Countermeasures for Reverse Osmosis Membrane Fouling at Water End of an Industrial Water Plant

义乌市某工业水厂出水水质较差,用水端反渗透膜堵塞频繁。基于此,提出了近期结合远期的改造运行方案,以延长膜堵塞周期。通过分析膜堵塞物的元素成分,发现有机物的主要元素C、O、N、P的占比分别为35.62%、32.64%、27.08%、0.76%,四种元素总占比高达96.10%,因此有机物是膜堵塞的主要原因。近期方案使用活性炭结合曝气生物滤池的联合工艺,总有机碳(TOC)去除率可达33.85%。远期方案增加预臭氧-活性炭-后臭氧(沉后)-活性炭工艺,TOC去除率可进一步提高至50%左右。该方案综合了近期与远期的运行策略,既满足了应急处理的需求,又达到了长期稳定运行的目标,可为实际工程中其他工业水厂出现类似现象提供技术经验。

The effluent quality of an industrial water plant in Yiwu City is substandard,and the reverse osmosis membrane at the water end is clogged frequently.On this basis,the paper proposed a short-term combined with long-term operation plan to prolong the membrane fouling period.By analyzing the elemental composition of the membrane-fouling material,it was discovered that the main elements of organic matter,namely C,O,N,and P,accounted for 35.62%,32.64%,27.08%,and 0.76%respectively and the total proportion of these four elements was as high as 96.10%. Therefore, organic matter was theprimary cause of membrane fouling. In the short-term operation plan, the combined process of activatedcarbon and biological aerated filter was employed, and the removal efficiency of TOC reached 33.85%. Inthe long-term operation plan, the process of pre-ozonation-activated carbon-post-ozonation (postprecipitation)-activated carbon was incorporated, and the TOC removal efficiency could be furtherelevated to approximately 50%. This plan integrated the short-term and long-term operational strategies,not only fulfilling the requirements of emergency treatment but also attaining the objective of long-termstable operation, which could offer technical experience for other industrial water plants with similarphenomena in actual projects.