Simulation Study On Typical Towns And Villages Cumulate MSW Polluting Property In Our Country

With the improvement of rural residents’ living standards and consumption leveland the popularity of various consumer goods，the amount of rural living garbage hasbeen increasing year by year. At present，the number of collection and transportationfacilities of rural living garbage is seriously inadequate，the degree of mechanizationand seal in collection and transportation process is low and there is no corollaryequipment. Large amount of living garbage were exposed in air or disorderlydisposed，and it can cause serious pollution to the environment. It not only occupiesoil and destroys landscape，but also impacts environment and resident’s health byspreading diseases. Based on this，the research simulates and studies the dissolutionlaws of pollutants （CODCr, BOD5, TP, TN） in simply stacked rural living garbage，eluted by rainfall and soaked in river water，and then estimates the contribution valuesof pollutants to the environment. The experiment draws the following conclusions:（1） In the rainfall simulation，the pH of leachate is rising over time. When theelution strength is1000mL/h and1800mL/h， the pH of leachate respectivelyfluctuates between6.5and8.0and between5.5and8.0.With the increase of elutiontimes，the concentration of CODCr，BOD5，TP，TN and NH₃-N in percolate variationtrend are similar. Their change can be divided to three stages：lower sharply，downslowly and change smoothly. All pollutants concentration come from the typical rurallife garbage percolate under the condition of elution strength is1800mL/h are loweroverall than the dissolution concentration under the condition of elution strength is1000mL/h. The pollutants concentration of life garbage percolate are vary with thevillages and towns. They show some differences. Rural life garbage in the conditionof stacking，once leached by rainfull，the cumulative dissolving-out amount ofCODCr，BOD5，TP，TN and NH₃-N will increase logarithmic function and polynomialfunction in these ways with the increase in time，increase quickly in initial stage，andincrease slowly later，and tend to be stable finally.（2） With the increase of soak time，the pH of percolate in the soak simulationstudy will reduce between the first and thirdly week，and then rising to the eighthweek，between the ninth and tenth week，the pH valule tends to be stable between7.5 and8.0，and presents alkalecence.The concentration of CODCr、BOD5、TP and TN inthe rubbish leaching liquor have the same trend，that firstly the concentration of themare increased with the soaking time，and then decreased slowly，finally they arebasically stable. When the domestic waste are immersing，the relationship betweenaccumulative leaching quantity of CODCrand TP and the soaking time withpolynomial functions.About the BOD5，the relationship between accumulativeleaching quantity of BOD5and the soaking time with logarithm functions（Banqiaotown and Tie Mengang township），but the relationship between accumulativeleaching quantity of BOD5and the soaking time with polynomial functions （Jiu Duhetown）.About the TN and NH₃-N，the relationship between accumulative leachingquantity of BOD5and the soaking time with polynomial functions（Banqiao town andJiu Duhe town）)，but he relationship between accumulative leaching quantity ofBOD5and the soaking time with power functions.（3）About the dynamic leaching simulation，When the elution strength is1800mL/h，the pollutant estimator of the annual yield waste of Banqiao town TieMengang township Jiu Duhe town is： CODCris289.08t、11.68t and112.07trespectively，BOD5is54.75t、5.48t and38.49t respectively；TP is0.092t、0.0062t and0.094t respectively；TN is4.35t、0.56t and8.83t respectively；NH₃-N is2.98t、0.32t and6.54t respectively；When the elution strength is1000mL/h，the CODCris57.59t、1.83t and104.75t respectively；BOD5is18.69t、0.73t and30.77trespectively；TP is0.047t、0.0021t and0.088t respectively；TN is3.26t、0.18and6.04t respectively；NH₃-N is1.19t、0.069t and4.36t respectively.About the staticimmersion，the pollutant estimator of the half of annual yield waste of Banqiao townTie Mengang township Jiu Duhe town is that：the CODCris419.75、33.93t and810.52t respectively；BOD5is212.47t、16.08t and266.76t respectively；TP is0.34t、0.051t and0.97t respectively；TN is11.60t、1.15t and22.21t respectively；NH₃-Nis4.08t、0.82t and15.65t respectively.