LIUWen-kai,LIUBin,ZHOUShi-qing,et al.Performance of Oxidation-Antiscale Integrated Process for Mitigating Nanofiltration Composite Membrane Fouling[J].China Water & Wastewater,2025,41(17):37-43.
氧化-阻垢工艺对纳滤复合膜污染的缓解效果
- Title:
- Performance of Oxidation-Antiscale Integrated Process for Mitigating Nanofiltration Composite Membrane Fouling
- 关键词:
- 氧化-阻垢联用工艺; 纳滤膜; 无机-有机-生物复合膜污染; 海水淡化
- Keywords:
- oxidation-antiscale integrated process; nanofiltration; inorganic-organic-biological composite membrane fouling; seawater desalination
- 摘要:
- 以我国东南沿海某地区海水为试验对象，系统研究氧化-阻垢短程联用工艺对纳滤膜无机-有机-生物复合膜污染的缓解效果。结果表明，在有机物和细菌的影响下，低浓度阻垢剂无法起到良好的阻垢效果；高浓度绿色有机阻垢剂会加重纳滤膜的有机负荷，降低有机物的去除率并导致消毒副产物浓度增大；经联用工艺处理后，膜污染得到有效缓解的同时提高了有机物和消毒副产物的去除效能，过滤600 min后膜比通量仍能维持在0.534，不可逆阻力降至0.16×1014 m-1，料液中钙离子、镁离子和硫酸根离子去除率均维持在95%左右；氧化-阻垢联用工艺相较于单独氧化工艺，其有机物和消毒副产物去除率有所下降；在实际应用过程中，需根据现场水质情况合理安排药剂投加顺序。联用工艺极大地改善了膜表面结晶现象，有效抑制微生物在膜表面生长，形成较为平滑的滤饼层结构，增强了纳滤膜抵抗污染物吸附的能力，可为缓解海水淡化过程中纳滤复合膜污染提供技术支撑。
- Abstract:
- This study systematically evaluated the effectiveness of a short-range integrated process involving oxidation and antiscale in mitigating inorganic-organic-biological composite membrane fouling in a nanofiltration system for desalination of seawater in a specific region along the southeast coast of China. Under the influence of organic matter and bacteria, low-concentration antiscalant was ineffective in achieving satisfactory scale inhibition. The application of high-concentration green organic antiscalant, on the other hand, increased the organic load of nanofiltration membrane, decreased the removal rate of organic matters, and consequently led to a higher concentration of disinfection by-products. After the integrated process treatment, membrane fouling was significantly mitigated, and the removal efficiencies of organic matters and disinfection by-products were notably enhanced. Following 600 minutes of filtration, the membrane maintained a specific flux of 0.534, while the irreversible resistance was reduced to 0.16×1014 m-1. Additionally, the removal efficiencies of calcium ions, magnesium ions, and sulfate ions in the feed solution remained consistently at approximately 95%. Compared to the oxidation process alone, the integrated process combining oxidation with antiscale resulted in a lower removal efficiencies of organic matters and disinfection by-products. During practical implementation, the sequence of chemical dosing should be appropriately arranged based on the specific water quality conditions at the site. The oxidation-antiscale integrated process significantly enhanced the crystallization phenomenon on the membrane surface, effectively suppressed microbial growth, facilitated the formation of a relatively smooth filter cake layer structure, improved the nanofiltration membrane’s resistance to pollutants adsorption, and could provide technical support for mitigating membrane fouling during the seawater desalination process.
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