无机-有机复配材料对Cd污染土壤的修复效应
Effect of inorganic-organic compound mixtures on the immobilization remediation of Cd contaminated soil
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摘要: 通过大田试验，研究了无机材料（海泡石、蒙脱土和骨粉）-有机物料（菌渣、鸡粪、牛粪和蚯蚓粪）复配材料对Cd污染土壤的钝化修复效应及其对土壤酶活性的影响.结果表明，有机-无机材料复配处理显著提高了土壤pH值，最大增加0.96个pH单位.不同处理下土壤中TCLP（Toxicity characteristic leaching procedure）提取态Cd含量均有所降低，海泡石+有机物料、蒙脱土+有机物料和骨粉+有机物料处理下分别较对照减少了12.5%—24.9%、10.4%—19.4%和12.0%—21.7%.与对照相比，不同复配处理下，玉米籽粒Cd含量降低22.8%—79.0%（骨粉+蚯蚓处理除外），低于国家食品卫生标准（0.1 mg·kg-1）.不同复配材料对土壤过氧化氢酶和脲酶活性促进效果整体上表现为骨粉+有机物料 > 蒙脱土+有机物料 > 海泡石+有机物料，较对照最大增幅分别达到74.4%、42.7%和10.5%.Abstract: 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.
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Key words:
- Cd /
- immobilization remediation /
- inorganic materials /
- organic materials /
- soil enzyme
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