재순환수 주입에 따른 매립장 함수율 변화특성 분석

Analysis of the change in water content and distribution was conducted according to the supply of recirculation water to alandfill. An excavation sample analysis showed that the recirculation water injection zone had water content 8.8% pointhigher than that of the non-injection zone, after 8 months of operation. And due to the influence of recirculation watersupply by vertical wells in injection zones, the water content increases along with depth more clearly than non-injectionzone. According to an electrical specific-resistivity survey after 13 months of operation, the water content got highertowards the bottom of the landfill. The water transmission coefficient is 8.72×10-4 cm/sec for injection zones and 3.36×10-5cm/sec for the intermediate cover layer; analysis shows that the intermediate cover layer may affect the penetrationvelocity of water supplied by the horizontal injection tube. For the scientific design and operation of re-injection facilities,it was deemed necessary to follow-up research on the residence time and behavior of re-injection water considering theratio of recirculation water supply in horizontal and vertical tubes, and pitcher coefficient of intermediate and waste layers.