Experimental Studies On Typical Pollutants In Landfill Leachate By Using Physical Chemistry Methods

The concentration of color, COD and ammonia-nitrogen are high, so treatment of the landfill leachate is difficult and the result is not ideal. Ascent environment brings the serious pollution to the soil and the ground water. Generally, the treatment schedule is physical-chemistry combined together with biotechnology.This study mainly on Chengdu Luodai landfill leachate of a comparative analysis of water quality and make appropriate physical and chemical methods of the leachate pretreatment for experimental study.The purpose of this thesis is studying on the pretreatment of the landfill leachate by coagulation-precipitation and chemical precipitation, eagering that the effective removal of COD, ammonia-nitrogen and heavy metals could be obtained.Then the feasible treatment method of landfill leachate can be introduced, and it can be reference for the treatment of other high concentration organism wastewater. The results showed that: Clarifification water done to clarify the saturation of chemical precipitation, the pH of 9, saturated clarifification water dosage at around 3 percent, to stay at 30 min, experiment on the leachate COD, ammonia and heavy metal ions to remove the best results. PAC coagulation precipitation to coagulant to polyacrylamide (PAM) for the flocculant, in the pH of 9, according to PAC: PAM = 9:1 ratio to increase 1.5 percent, the settlement at the time was 45 min, COD and ammonia nitrogen removal rate reached 21.22 percent, respectively, 13.43 percent, heavy metals Pb,Ni,Cr,Cu removal rate reached 66.67 percent, 29.74 percent, 42.63 percent, 81.82 percent. Finally, Na₂S to join the appropriate amount of heavy metal ions have a good effect of removing. Through the GC-MS analysis of patterns, the difficult process of degradation and toxic organic compounds also have a good effect of the removal, biological treatment for follow-up to provide good conditions.