垃圾沥滤液氢氧化钙混凝-氨吹脱预处理

Experimental Study on Municipal Solid Waste Incineration Leachate Treatment Using Lime Coagulation-Air Stripping Process

采用氢氧化钙混凝-氨吹脱法，对垃圾沥滤液进行预处理，研究氢氧化钙的投加量、pH值、温度和气液比等对混凝-氨吹脱率的影响．结果表明，在垃圾沥滤液中，投加6g·L^-1氢氧化钙，可将沥滤液的pH值调到10．5；混凝预处理后，对总磷的去除率可达80％，氨氮的去除率为15％～30％，对化学需氧量的去除率不高．垃圾沥滤液氨吹脱过程中，当pH值为10．5时，氨吹脱率可达到65％；而当气液比为3000，水温为45℃以上，填料质量分数为50％的条件下，氨吹脱率可达到85％以上．

Lime coagulation-air stripping process was used to treat leachate of municipal solid waste incineration plants＇ stockroom. The effects of pH, gas/liquid ratio, temperature and filler packing ratio on the stripping performance were studied. The results show that when the pH of leachate was adjusted to 10. 5 after put into 6 g · L^-1 Ca（OH）2, the removal ratio of total phosphor was over 80%; the removal ratio of ammonia and nitrogen is 15-30%. The removal efficiency became lower due to the soluble CODcr presented in influent. In conditions where pH= 10. 5, gas/liquid ratio is 3 000 times, the leachate temperature was over 45 ℃, and the filler packing ratio was 50%, over 85% of ammonia nitrogen was removed by the air stripping.