支撑气膜法脱除／回收垃圾渗滤液中氨氮

利用由微孔疏水性聚丙烯中空纤维制成的工业级膜组件对垃圾渗滤液中氨氮进行支撑气膜法脱除研究，考察了泡沫分离．石灰絮凝等预处理技术对垃圾渗滤液表面张力及COD值的处理效果，在此基础上研究了物料因素和操作因素对膜传质性能的影响，并对该工艺的长期操作稳定性进行了研究。实验结果表明该预处理技术不仅可显著提高垃圾渗滤液的表面张力，还可大大降低其色度和COD值。当进料流量为100L／h、进料氨氮浓度为1000～3000mg／L、硫酸吸收液流量为200L／h、硫酸浓度为6％～10％、温度为20～30℃时，支撑气膜过程（两级膜组件串联）可有效脱除垃圾渗滤液中99％以上的氨氮，同时得到含10％～15％硫酸铵的水溶液作为副产品。工业级支撑气膜组件在连续运行的2个月内保持了良好的传质稳定性。

Removal/recovery of ammonia from landfill leachate by supported gas membrane-based separation process

The experiments were carried out to investigate the supported gas membrane-based separation process for removal/recovery of ammonia from landfill leachate by using industrial scale membrane modules made from microporous hydrophobic polypropylene hollow fibers. The effects of pretreatment technologies such as foam separation and lime flocculation-coagulation on surface tension and COD of the landfill leachate were examined. The effects of feed characteristics and operational factors on the overall mass transfer coefficient and the long-term operational stability were also investigated. The experimental results showed that the pretreatment steps could sig- nificantly increase the surface tension of the landfill leachate, and could greatly reduce its ehroma and COD val- ue. More than 99% of ammonia in the landfill leachate could be removed effectively by this process with configu- ration of two membrane modules in series under the following experimental conditions ： feed flow rate of 100 L/h, feed ammonia nitrogen concentration of 1 000 - 3 000 mg/L, acidic-stripping-solution flow rate of 200 L/h, sul- furic acid concentration of 6% - 10% and temperature of 20 - 30℃. Meanwhile, an aqueous solution of 10%- 15% ammonium sulfate was obtained as a by-product. The pilot-scale demonstration test was operated for two months in which it showed great operational stability and reliability.