ZHOUQuan,ZHANGYao,ZHANGCheng-jiong,et al.Pilot Study on Treatment of Yellow River Water through Ultrafiltration-Nanofiltration Hybrid Membrane Process[J].China Water & Wastewater,2024,40(21):43-47.
超滤-纳滤双膜工艺处理黄河水的中试研究
- Title:
- Pilot Study on Treatment of Yellow River Water through Ultrafiltration-Nanofiltration Hybrid Membrane Process
- 摘要:
- 针对黄河水的处理，构建了一套超滤-纳滤双膜工艺中试系统（处理能力为6 m3/h），考察其处理效果和能耗。纳滤系统对电导率和总硬度的平均去除率分别为90.64%和94.96%；通过碱洗+酸洗的化学清洗，系统可以恢复97%的除污效果。系统废水箱内发现大量碳酸钙沉淀物，导致废水箱内浓水的溶解性总固体（TDS）降低了18%，而利用氢氧化钙最高可以降低30.21%的浓水TDS，使其达到820 mg/L，满足直接排入城镇下水道的要求。纳滤系统在较高的运行压力、较大的流量和较高的原水温度下，能耗较低，最优工况下的能耗为0.780 9 kW·h/m3。通过多元回归分析，可以用回归方程表征运行压力、流量、原水温度对纳滤系统能耗的影响。
- Abstract:
- A pilot system of ultrafiltration(UF)-nanofiltration(NF) hybrid membrane process with a processing capacity of 6 m3/h was established for the treatment of Yellow River water, and its treatment performance and energy consumption were examined. The average removal efficiencies of the NF system for conductivity and total hardness were 90.64% and 94.96%, respectively. The NF system was capable of restoring 97% of its decontamination capacity through alkali cleaning and acid cleaning. A considerable amount of calcium carbonate precipitate was discovered in the wastewater tank, leading to an 18% reduction in the concentrate TDS. Meanwhile, the application of calcium hydroxide could decrease the concentrate TDS by up to 30.21%, enabling it to reach 820 mg/L and fulfilling the requirements for direct discharge into the urban sewer. The NF system exhibited lower energy consumption under higher operating pressure, higher flow rate, and higher raw water temperature. The energy consumption under the optimal working condition was 0.780 9 kW·h/m3. Through the application of multiple regression analysis, the influences of operating pressure, flow rate, and raw water temperature on the energy consumption of the NF system could be delineated by the regression equation.
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