Study On The Pretreatment Of Landfill Leachate With Fenton And MAP

Sanitary landfill of garbage brings lots of Landfill leachate. It is very harmful for theenvironment. The components of landfill leachate are very complex and the pollution stay ahigh level in landfill leachate. In this paper, we focus on the disposal technology of themunicipal refuse, we study on the treatment effect of using Fenton-MAP, and discuss theimpact factor of the experiment. In the stage of MAP, it used the phosphate waste water toprovide the phosphate which is needed in the formation of MAP, buy this way, it is hoped toreach the goal of treating waste-water with wastes and compositive governance.Through this research, the results we get is showed as follows, the optimal conditions are:Dosage of H₂O₂is20ml/L, pH is4, FeSO₄·7H₂O/H₂O₂molar ratio is2:1, Reaction time is1.5h. Dosage of H₂O₂is the main impact factors of Fenton oxidation treatment. In the optimalconditions, the removal rate of CODcr is45.18%.In the stage of MAP, the effect of MAP treatment is studied. The optimal conditions are:pH is9.5, Mg/P/N molar ratio is1.2:1.1:1, Reaction time is20min, mixing speed is200r/min. Ph is the main impact factors of Fenton oxidation treatment. In the optimalconditions, the removal rate of ammonia-nitrogen is82.34%. After the treatment, the effluentfrom MAP treatment contains phosphate which is46.72mg/L, and ammonia-nitrogen whichis70.33mg/L. On the conditions that only Landfill leachate and the phosphate waste waterare used experiment, in the optimal conditions, the removal rate of ammonia-nitrogen is80.91%, the content of phosphate in the effluent is31.58%. When increased the use of thephosphate waste water, the removal rate of ammonia-nitrogen is raised, but the phosphate inthe effluent is too much.The components of the sediment are analysed, the contents of P（13.93%）,N（5.66%）,Mg（10.22%） in the sediment is closed to the （13.93%）,N（5.66%）,Mg（10.22%） in the sediment is closed to the percentage of nutrient factor of the theoretical MAP. This can prove most of the sediment is MAP, and the sediment can be used as slow-release-fertilizer.Though analyzed the technicality and economy of all of two stages, Fenton-MAP isfeasible as the pretreatment technology.