非卫生垃圾填埋场渗滤液污染防治对策研究

Research on Unqualified Landfill Leachate Pollution Prevention and Control

针对非卫生垃圾填埋场环境污染问题,以某垃圾填埋场为例,通过WHI UnSat Suite软件HELP模块计算不同填埋条件下渗滤液渗漏量。利用GMS模拟了该垃圾场中心抽水条件下污染物迁移变化规律。结果表明,简单地表防渗条件下,渗滤液渗漏量为现状条件下的50%,增铺HDPE土工膜后,渗漏量可减少99%。卫生填埋渗滤液仅为现状条件下的3.6×10-3倍。当抽水量为2 000 m3/d时,Cl-浓度呈明显下降趋势,由84 mg/L降至80.1mg/L。

To phase down leachate pollution in unqualified landfills, the paper calculates leak amount of leachate in differ-ent buried conditions by using HELP part of WHI UnSat Suite software. According to the calculation, the movement of contam-inant when the landfill center pumping is simulated with the knowledge of GMS. Results show that the leachate leak amount of landfill with simple surface seepage is only half of it in landfill with no seepage. Moreover, in a landfill covered with HDPE geomembrane, the leak amount decreases 99 percent, which equals to 3. 6 ＆#215; 10 -3 times of it with no filtration. Under this condition, Cl- content decreases from 84 mg/L to 80. 1 mg/L when the water pumping amount is 2 000 m3/d.