摘要：

垃圾渗滤液具有较高的COD、氨氮和电导率，其复杂的水质污染特性使得采用反渗透处理时负荷过高，导致膜性能及膜渗透通量下降，严重影响了处理效率。为使工艺能够顺利进行，以进水pH、运行压力和温度作为影响因素，以浓缩液和产水的COD、氨氮和电导率作为评价参数，通过分析浓缩倍率、膜通量及产水率的变化情况，对兰州某垃圾填埋厂渗滤液进行处理并得出最佳工况。结果表明，3种因素对碟管式反渗透（DTRO）系统影响效果为运行压力>温度>进水pH，且当pH为6.5，运行压力为6 MPa，温度为40 ℃时，系统的浓缩倍率最高，达到4.07，产水率最好，稳定达到75.6%，为后续浓缩液处理减轻了负荷。

关键词: 垃圾渗滤液, 碟管式反渗透, 浓缩倍率, 产水率

Abstract:

Landfill leachate has high COD, ammonia nitrogen and conductivity, these complex pollution characteristics make the reverse osmosis treatment load too high, which further leads to the decrease of membrane performance and membrane permeate flux. This paper took influent pH, operating pressure and temperature as influencing factors, and COD, ammonia nitrogen and conductivity of concentrate and produced water as evaluation parameters, to derive the optimal working conditions by analyzing the changes of concentration multiplication rate, membrane flux and water production rate to treat leachate from a landfill plant in Lanzhou. The results showed that the effect of the three factors on the DTRO system was operating pressure>temperature>inlet pH, and when the pH was 6.5, the operating pressure was 6 MPa, and the temperature was 40 ℃. The system had the highest concentration multiplier of 4.07 and the best water production rate of 75.6% consistently, which reduced the load for subsequent concentrate treatment.

Key words: landfill leachate, disk-tube reverse osmosis, concentration ratio, water yield

中图分类号: 

• X703.1