CHENShou-bin.A Pilot Study on Combined Nanofiltration Process for Treating Micro?polluted Raw Water[J].China Water & Wastewater,2024,40(21):48-53.
A Pilot Study on Combined Nanofiltration Process for Treating Micro?polluted Raw Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第21期
Page:
48-53
Column:
Date of publication:
2024-11-01
- Keywords:
- micro-polluted raw water; nanofiltration; combined process; treatment performance; operation optimization
- 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.
Last Update:
2024-11-01