利用高效溶磷菌钝化修复铅污染土壤效果及其影响因素研究

发布时间：2018-06-04 12:23

本文选题：溶磷菌 + 磷　；参考：《科学技术与工程》2016年31期

【摘要】：利用高效溶磷菌的溶磷特性对受铅污染土壤展开修复研究,研究了菌液添加量与土壤全磷含量对重度污染土壤修复效果的影响。通过测定有效磷含量、有效态铅含量、pH等指标变化,结合X射线衍射法(XRD)分析土壤物相变化,初步研究了溶磷菌的钝化机制。当目标溶磷菌发酵菌液的添加量达到150mL/kg时,目标菌可有效在土壤中存活;当土壤全磷含量达到1g/kg时,经过钝化培养可将土壤有效态铅含量降至4mg/kg、土壤中有效磷含量增加至19mg/kg。对钝化后土壤Pb形态分析表明,在目标溶磷菌作用下,土壤中Pb由可交换态、碳酸盐结合态向残渣态转变,XRD分析结果表明残渣态主要为氯磷酸铅盐化合物(Pb_5(PO_4)_3Cl),是Pb在土壤中最稳定的化合物之一。
[Abstract]:The remediation of lead-contaminated soil was studied by using the characteristics of high-efficiency phosphorus solubilizing bacteria, and the effects of bacterial solution and total phosphorus content on the remediation effect of heavily polluted soil were studied. The passivation mechanism of phosphorus solubilizing bacteria was preliminarily studied by measuring the changes of available phosphorus content and available lead content and pH, and analyzing the phase change of soil by means of X-ray diffraction (XRD). The target bacteria could survive in the soil effectively when the amount of the fermentation liquid reached 150mL/kg, and when the total phosphorus content of the soil reached 1g/kg, the available lead content in the soil could be reduced to 4 mg / kg and the available phosphorus content in the soil could be increased to 19 mg / kg by passivation culture. The analysis of Pb speciation in passivated soil showed that the Pb in the soil was exchangeable under the action of phosphorus solubilizing bacteria. XRD analysis of carbonate-bound to residual state shows that the residual state is mainly Pb5PO4Snap-3Cl, which is one of the most stable compounds of Pb in soil.
【作者单位】：中国地质科学院水文地质环境地质研究所;
【基金】：河北省青年自然科学基金(D2016504009)资助
【分类号】：X53;X172

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