渗滤液的反渗透浓缩液回灌技术应用

以宜昌、宁国、蒙城垃圾填埋场为例,介绍了碟管式反渗透(DTRO)——浓缩液回灌工艺,研究发现:浓缩液回灌方式应根据垃圾填埋场的地理特征和业主的具体要求来确定。山谷型填埋场可以采用石笼回灌法,施工简单,成本较低,另外也可采用两层生物滤化床方式,成本稍高,但效果较好;平原型填埋场宜采用两层生物滤化床方式,而采用石笼回灌法容易出现短流现象。浓缩液回灌对渗滤液电导率无明显影响,不会影响后续反渗透系统的正常运行。

USE OF RECIRCULATION TECHNIQUE OF CONCENTRATED LEACHATE PRODUCED BY LEACHATE REVERSE-OSMOSIS

The paper takes landfills in Yichang,Ningguo and Mengcheng for example,it was introduced a process of disc tube reverse osmosis(DTRO)——concentrated leachate recirculation.The result indicated that the way of recirculation should be based on the geographical features of landfill and owners’ demand.Valley landfills can use the way of stone cage recirculation that is built simply at low-cost.On the other hand,the way of two-biological filter bed which is more effective can also be used although more costly.Plain landfills should use two-layer biological filter bed,short flow may be caused if use the way of stone cage recirculation.Conductance will not be influenced obviously due to recirculation,and the normal operation of RO system won’t be affected.