CHENShou-bin.A Pilot Study on Combined Nanofiltration Process for Treating Micro?polluted Raw Water[J].China Water & Wastewater,2024,40(21):48-53.
纳滤组合工艺应对微污染原水中试研究
- Title:
- A Pilot Study on Combined Nanofiltration Process for Treating Micro?polluted Raw Water
- Keywords:
- micro-polluted raw water; nanofiltration; combined process; treatment performance; operation optimization
- 摘要:
- 为应对日趋严重的水污染问题，更好地保障饮用水水质安全，针对福州地区微污染水源，探索了以纳滤为核心的组合工艺实际应用情况，考察了组合工艺的处理效果并开展了运行优化研究。结果表明，纳滤组合工艺在该水源水质情况下适应性及稳定性较强，能够保障长期供水安全。整体工艺出水的各项水质指标均满足《生活饮用水卫生标准》（GB 5749—2022）的要求。试验期间出水浊度保持在0.04~0.10 NTU之间，出水氨氮浓度<0.025 mg/L。与原水相比，UV254和CODMn的平均去除率分别为93.16%和70.55%，电导率和溶解性总固体（TDS）的平均去除率分别为96.60%和96.38%。典型溶解性有机物中类腐殖质的去除率为99.9%，溶解性微生物代谢产物的去除率为78.1%，芳香类蛋白质因其存在的部分极小分子质量物质无法被完全截留，去除率仅为40.3%。纳滤工艺经响应面模型优化后采用的运行压力为0.5 MPa、回收率为67%，能实现97.6%的高电导率去除率及0.45 kW·h/m3的产水电耗，在该水质情况下更适用于组合工艺的稳定运行。
- Abstract:
- To address the increasingly severe issue of water pollution and to enhance the safety of drinking water quality, a pilot test was conducted to explore the practical application of a combined process centered on nanofiltration for treating micro-polluted water from a water source in Fuzhou. The treatment efficacy of the combined process was evaluated, and an optimization study for its operation was performed. The combined nanofiltration process demonstrated robust adaptability and stability in response to the source water quality in Fuzhou, ensuring long-term safety of the water supply. All water quality indicators of the overall process effluent met the limits specified in Standards for Drinking Water Quality (GB 5749-2022). Throughout the testing period, the turbidity of the effluent was consistently maintained within a range of 0.04 NTU to 0.10 NTU, while the ammonia nitrogen in the effluent remained below 0.025 mg/L. In comparison to raw water, the average removal efficiencies of UV254 and CODMn were 93.16% and 70.55%, respectively, while the average removal efficiencies for conductivity and TDS reached 96.60% and 96.38%, respectively. In typical dissolved organic matters, the removal efficiency of humic substances reached 99.9%, while the removal efficiency of dissolved microbial metabolites was 78.1%. Conversely, the removal efficiency of aromatic proteins was only 40.3%, attributed to the presence of certain extremely low molecular weight compounds that could not be entirely retained. Following optimization through the response surface model (operation pressure of 0.5 MPa and recovery efficiency of 67%), the nanofiltration process could achieve a remarkable conductivity removal efficiency of 97.6% and a power consumption in water production of 0.45 kW·h/m3, making it particularly suitable for the stable operation of the combined process.
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