Effect of Remdiation Technology on Heavy Metal Concentration in Paddy Soil and Crop.

Heavy metal pollution in agricultural fields near at abandoned mine areas was a serious problem in Korea, and various remediation technologies have been applied to ensure the crop safety. Among different remediation technologies, the stabilization method has been widely applied in agricultural fields due to the minimal adverse impact on the soil fertility and low cost. The main purpose of this research was to examine stabilization efficiency of metal(loid)s in paddy soil with chemical amendments, also it was to confirm the effect of metal(loid)s in the rice and soil solution. Stabilization field experiment was conducted in near of Chungbuk Danyang-gun Eu-jin mine and amendment used in this study were limestone, steel slag, acid mine drainage sludge (AMDS). Amendments were mixed at the 40cm depth from surface and water samplers were installed. Concentration of metal(loid)s in rice, soil and soil solution were compared. In case of arsenic in soil, AMDS was the most effective (67%) and limestone showed the highest efficiency (40~75%) on stabilization in soil for other heavy metals such as Cd, Pb, Cu, Ni. Result of soil solution showed similar trend with soil (As - AMDS: 55%, Cd, Pb, Cu, Ni – limestone: 67~94%). In cast of metal(loid)s in rice, absorption inhibition of AMDS showed high efficiency: As (72%), Cd (79%) and Zn (22%). Correlation of heavy metal concentration between soil and soil solution showed positive correlation for As, Cd and Pb as 0.989, 0.982 and 0.761respectively. In conclusion, AMDS and limestone showed the highest efficiency on heavy metal stabilization depending on heavy metal species.