The experimental study on pre-treatment of the landfill leachate with treated coal ash was put forward in this paper.The results showed that after having been treated with the coal ash the concentration of COD-(Cr) and the ammonia were greatly reduced in the landfill leachate.The COD-(Cr) with concentration range from 12000 mg/L to 25000mg/L was reduced to about 3000mg/L and the ammonia with concentration range from 400 mg/L to 450 mg/L was reduced to less 70 mg/L.The indexes of Cu,Cd,Zn,Pb and Cr of treated landfill leachate were all measure up(GB8978-1996) while their original concentrations were respectively 7.0 mg/L,3.5 mg/L,3.5 mg/L,10.0 mg/L and 5.5mg/L.

Both based on the necessity and impendence situation for the treatment of landfill leachate in Dalian municipal were analyzed,and the environment pollution mechanism of landfill leachate was studied.The landfill leachate that were both in storage ponds and the new production were sampled and tested.The water quality of landfill leachate was assessed with the method of single pollution index.The results showed that the water quality of landfill leachate of Dalian municipal landfill is quite worse,especially in the heavy metal pollution.Finally,characters of landfill leachate of Dalian municipal landfill were summarized,and suggestions on the treatment of landfill leachate were proposed.