CAJ | 학술논문

在pH值为3．0、温度为30℃、矿浆质量分数为7％的优化浸出条件下，通过摇瓶试验，结合X射线衍射分析、BCR法3步连续提取，研究了土著微生物浸出重金属沉渣后余渣中重金属的潜在毒性。结果表明：土著微生物浸出7d后，沉渣中Cd，Mn，Cu，Pb，Zn含量分别由原来的4530，7650，830，29530，62350mg／kg降低至730，1280，390，13810，15650mg／kg．浸出过程沉渣中Cd，Mn，Cu，Pb，Zn等重金属的酸可提取态相对含量显著降低，残渣态相对含量提高．余渣环境活性和潜在危害低于《危险废物鉴别标准》（GB5085．3—2007）的规定，土著微生物浸出能有效实现重金属沉渣的资源化和无害化．
재pH치위3．0、온도위30℃、광장질량분수위7％적우화침출조건하，통과요병시험，결합X사선연사분석、BCR법3보련속제취，연구료토저미생물침출중금속침사후여사중중금속적잠재독성。결과표명：토저미생물침출7d후，침사중Cd，Mn，Cu，Pb，Zn함량분별유원래적4530，7650，830，29530，62350mg／kg강저지730，1280，390，13810，15650mg／kg．침출과정침사중Cd，Mn，Cu，Pb，Zn등중금속적산가제취태상대함량현저강저，잔사태상대함량제고．여사배경활성화잠재위해저우《위험폐물감별표준》（GB5085．3—2007）적규정，토저미생물침출능유효실현중금속침사적자원화화무해화．
Shaking flask experiments were used to study the indigenous microorganisms leaching of heavy metals from sediment in the optimum conditions,which were determined to be pH = 3.0,65℃ and 7% pulp density. Residues from the bioleaching were analyzed through XRD and three-stage BCR sequential extraction procedure. Results show that heavy metal（Cd, Mn, Cu, Pb, Zn） contents sharply decrease over 7 days leaching,from 4 530 mg/kg,7 650 mg/kg,830 mg/kg,29 530 mg/kg,62 350 mg/kg to 730 mg/ kg, 1 280 mg/kg,390 mg/kg,13 810 mg/kg, 15 650 mg/kg respectively. Acid extractable percent content decreases remarkably during the bioleaching process;meanwhile,residual form percent content rises obvi- ously. The environmental availability and potential risk of heavy metals are less than the standards listed in Hazardous Waste Distinguishable Standard （GB 5085.3--2007）. Indigenous microorganisms can effi- ciently implement the resources and harmlessness of heavy metals in sediment.