Removal efficiency and soil fertility of heavy metal-polluted farmlands after soil turn-over dilution and soil acid wash

• Main Authors: Song-Fu Yang, 楊淞富
• Other Authors: Ming-Muh Kao
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/63600475896259525861

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 93 === 　During the beginning of the Soil and Groundwater Pollution Fund operation, many mechanisms and policies are still under planning and amendment. Considering the pollution property, improving schedule, and remediation effectiveness, the EPA will apply “Soil Turn-over Dilution” to the chromium, copper, nickel, and zinc-polluted farmlands and “Soil Acid Wash ” or ”Thermal Treatment ” to the cadmium and mercury ones. In this study, we evaluated the variation of physical properties and fertility of heavy metal-polluted farmlands after soil turn-over dilution and soil acid wash. 　The results after acid-washing indicated the organic matter, nitrogen, phosphorous, and available potassium of soils were decreased 6.3%, 7.7%, 1.2% and 27%, respectively. But the total potassium, available nitrogen and available phosphorous of soils were increased 43.7%, 12.5% and 112.3%. In the turn-over sites, we found the organic matter, nitrogen, phosphorous, and potassium of soils was increased 102%, 66.7%, 13.2% and 7.2%. And in the other fine soils, the organic matter and total nitrogen were decreased substantially but the total phosphorous and potassium were increased. After we added excrement and liquid fertilizer to the farmlands after turn-over, we found the organic matter, nitrogen, phosphorous, and potassium of soils was increased significantly. But we must deserve to be mentioned on the soluble salts content of excrement fertilizer might too high and cause the conductivity increased suddenly. On the estimation of fertilizer-applying, we used nitrogen loss percent to be the calculated criterion, it might cause the phosphorous of soils exceeding. In the seed germination tests of the farmlands after remediation, the results showed the germination percentage was increased significantly to benefit cultivation follow-up.