强化混凝耦合改性沸石过滤处理微污染水

Enhanced Coagulation Coupled with Modified Zeolite Filtration Treatment for Micro-Pollution Source Water

针对南方某市微污染水源水(XJ)低温低浊及氨氮问题,采用烧杯实验及中试动态运行实验进行复合助凝剂强化混凝耦合改性沸石过滤处理低温低浊及氨氮效能研究。结果表明,配置的Fe/Si复合助凝剂在絮凝初期投加时明显提高了低温低浊水的出水水质。复合助凝剂的存在起到良好的吸附架桥作用,提高混凝效果。强化混凝对氨氮去除作用有限,不足10%。改性沸石颗粒(MZK)能够利用离子交换和化学吸附作用显著提高氨氮去除效果,去除率达到83.1%。在连续中试动态运行中,出水浊度基本控制在0.6 NTU;在240 h的运行周期内,MZK对氨氮的去除效果明显优于石英砂,氨氮的平均去除率为77.6%,出水处氨氮浓度均小于0.5 mg/L。强化混凝耦合改性沸石过滤为低温低浊及氨氮的水处理提供了理论基础和技术参考,具有较好的应用前景和推广价值。

A beaker and a pilot dynamic operation experiments were conducted to study the effectiveness of a low-temperature,low-turbidity,and ammonium treatment using a composite coagulant-enhanced coagulation coupled with modified zeolite filtration for a southern city's micro-polluted raw water source(XJ).The results showed that the effluent quality of low-temperature and low-turbidity water was improved by the Fe/Si composite coagulant at the early stage of flocculation.The presence of the composite coagulant will play a good adsorption bridging effect,thus the coagulation was improved.The effect of enhanced coagulation on ammonium removal was limited to less than 10%.The modified zeolite particles(MZK)were able to use ion exchange and chemisorption,which significantly improved the removal of ammonium following the enhanced coagulation with a removal rate of 83.1%.In continuous pilot dynamic operation,the turbidity of the effluent was basically controlled at 0.6 NTU.During the 240 h operation cycle,the MZK was significantly more effective than quartz sand in removing ammonium with an average removal rate of 77.6%for ammonium,and the effluent ammonium concentration was less than 0.5 mg/L.The enhanced coagulation coupled with modified zeolite filtration provided a theoretical basis and technical reference for water treatment of low-temperature,low-turbidity and ammonium,with good application prospects and promotion value.