Effect of inorganic-organic compound mixtures on the immobilization remediation of Cd contaminated soil
Field experiments were conducted to investigate the effects of inorganic materials (such as sepiolite,montmorilloniod and bone meal) and organic materials (e.g.fungi residue,chicken manure,cow dung and earthworm feces) on the immobilization remediation of Cd contaminated soils and soil enzyme activities.The results showed that organic-inorganic compound materials increased soil pH significantly,with a maximum increase of 0.96 pH units.The concentration of toxicity characteristic leaching procedure (TCLP)-Cd was reduced under the treatments of sepiolite + organic materials,montmorilloniod + organic materials and bone meal + organic materials,resulting in 12.5％-24.9％,10.4％-19.4％ and 12.0％-21.7％ reduction,respectively,when compared with the control groups.In comparison to the cented soils,the content of Cd in maize was reduced by 22.8％-79.0％ (expect for the treatments of bone meal + earthworm feces),which was below the maximum permissible concentration of Cd set by the National Standard Agency of China (0.1 mg·kg-1).The decreasing order of catalase and urease activities was bone meal + organic materals ＞ montmorilloniod + organic materials ＞ sepiolite + organic materials,with a maximum increase of 74.4％,42.7％ and 10.5％,respectively,in comparison to CK.
NETL
NSTL
万方数据
维普
