فاطمه سادات حسيني درافشان

Lan‎dfilling of urban solid waste (MSW) is one of the important environmental an‎d urban challenges, which has become a complex issue with the increase in population an‎d the production of more waste. Due to the limitation of natural resources an‎d environmental concerns, new an‎d more advanced methods are needed for waste management. One of the new methods in waste management is mechanical biological treatment (MBT). This method uses a combination of mechanical an‎d biological processes to reduce the amount of waste an‎d improve its quality. In this research, the physical an‎d mechanical characteristics of the processed waste (compost) of Arad Kouh Burial an‎d Processing Center were investigated an‎d then the values of the permeability coefficient in the saturated state under the horizontal an‎d vertical flow of this type of waste were determined using the Russel device an‎d the fixed water head. It has been eva‎luated an‎d the effect of each of the overhead parameters, dry density, porosity ratio an‎d strain on this coefficient has been studied.In general, a significant decrease in the permeability value was seen in the case of vertical an‎d horizontal water flow with the increase of head from 100 to 600 kPa. By increasing the percentage of initial moisture in the samples an‎d its effect on the settlement changes in the loading series of the device, we saw a decrease in the effect of moisture in the density values an‎d, accordingly, in the values of the vertical an‎d horizontal permeability coefficients, so that the permeability values in the samples of 60 an‎d 80% humidity are mixed. The values of the dry density of the sample were among the most effective parameters in the value of hydraulic conductivity, so that in the study of the permeability of the vertical water flow, the sample with the highest dry density of 9.38 kN/m3 showed the lowest value of the permeability coefficient of 7.27 ×8 -10. The amount of strain increase with the increase of overhead, especially from 400 to 600 kilopascals in the samples with 60 an‎d 80% humidity, an‎d we saw a significant decrease in the compression rate in both horizontal an‎d vertical flow conditions.In order to investigate the potential of soil water retention in the processed waste an‎d to determine the remaining degree of saturation an‎d the amount of incoming air until it reaches the unsaturated state an‎d to know the hydraulic properties of the compost mass, two series of samples with a density of 4.5 an‎d 6.5 kN/m3 were used inside the pressure plate device. that the amount of air input is 3 kilopascals an‎d lower values can be reported. The values of stable saturated moisture in high suctions, especially in the sample with higher density, indicate the small pores inside the compost mass particles, which have played a significant role in reducing the permeability coefficient, so that with the increase of dry density in the series of permeability tests, the interparticle pores to Browsing has decreased an‎d the small pores inside the particles have had a great effect on reducing the vertical an‎d horizontal permeability coefficients.

زباله پردازش شده , ضريب نفوذپذيري , دستگاه روسل , منحني نگهداشت آب-خاك , چگالي خشك , درصد رطوبت

biological mechanical processed waste , permeability coefficient , Row cell , soil water retention curve , moisture percentage , dry density

Fateme Sadat Hosseini Dorafshan

Dr. Mehran Karimpour Fard-Dr. Habib Shahnazari