Experimental Study Of Landfill Leachate Treatment In Situ Injection Method

With the rapid development of urbanization, people's living standard is improved, Municipal waste are also increased year by year. According to statistics, each year more than 600 cities in our county will produce 160 million tons of garbage, and increase at a rate more than 10%. Most of the city in our county to deal with municipal waste sanitary landfill at present, it will greatly reduce open garbage pile caused by environmental problems, but the landfill also brings new environmental problems, produce a large number of garbage leachate, if not handled properly, it will lead to serious pollution of air, water and soil, and ultimately cause harm to ecological environment and human health, so the garbage leachate treatment is particularly important.First, through experimental study, different leaching conditions on the speed of living garbage landfill site stability and the influence of the organic law of precipitation in the paper. The results showed that, when using concentrate leaching, leaching amount is 5L, and leaching frequency is 3 times, the waste stabilization time is shorter. Using liquid injection, leaching amount is 10L, and leaching frequency is 1 times, the subsidence stabilization is faster.When living garbage landfill site stability, through experimental study, injection quantity and injection frequency of leachate pollutants removal effect. The experimental results show that, injection quantity is 5L, and injection frequency is 3 times, the COD and NH3-N and TP removal effect is good. When injection frequency is same, injection quantity is 5L, COD and NH3-N and TP removal rate of the average respectively is 26.21%,8.52%and 18.53%; when injection quantity is same injection frequency is 3 times, COD and NH3-N and TP removal rate of the average respectively is 15.18%,8.53%and 14.19%. When injection quantity is 5L, we study the reaction kinetics of organic matter degradation, get the COD for the first order kinetics model is Ct=Coexp(-0.079t+0.4051), the correlation coefficient of R2 is 0.9928; the NH3-N for the second order kinetics model is Ct=Coexp(2×10-5t+0.0001), the correlation coefficient of R2 is 0.9283; the TP for the second order kinetics model is Ct=Coexp(0.0065t+0.0134), the correlation coefficient of R2 is 0.9579.On the basis of the previous research, the garbage leachate in situ injection processing dynamic studies, considering the hydraulic load, organic load, and C/N three influence factors on the COD and NH3-N removal effect. The experimental results show that, when the hydraulic load is 33.96 mL/(L·d), COD and NH3-N removal rate of the average respectively is 10.7% and 4.77%, when the organic load is 40.53 mg/(L · d), the removal rate of COD is 10.56%, when the organic load is 23.41 mg/(L·d), the removal rate of NH3-N is 4.69%, when C/N is 2.3, COD and NH3-N removal rate of the average respectively is 7.2% and 3.8%. Through the injection method of experimental study on the effect of leachate treatment, we get the best process parameters for injection technology, provide the theory basis for the actual operation.