造纸污泥作为铅固定剂修复重金属污染土壤的试验

发布时间：2018-05-31 14:00

本文选题：造纸污泥 + 铅　；参考：《应用基础与工程科学学报》2017年02期

【摘要】：研究了利用造纸污泥这一工业固体废弃物作为铅固定剂修复重金属污染土壤的效果和机理.首先通过形态提取试验研究了造纸污泥对土壤中铅形态转化的影响,用X-射线光电子能谱分析了造纸污泥固定铅的机理,最后通过对油菜的盆栽试验评价了造纸污泥修复铅污染土壤的效果.试验发现添加造纸污泥使土壤中铅的可交换态和碳酸盐结合态明显减少,有机结合态和铁锰氧化态显著增加,说明造纸污泥对土壤中铅起到了固定作用.在添加造纸污泥后的土壤中未检出PbCO_3和Pb_3(OH)_2(CO_3)_2,而检测出Pb(C_2H_3O_2)_4、Pb(C_6H_5)_4和[Pb_3Cl_2(HSCH_2C(NH_2)HCOO)_2],解释了添加污泥使铅碳酸盐结合态的降低及铅有机结合态的增加.铅铁锰氧化态的增加可以用铁元素特征峰向高结合能方向移动解释.添加造纸污泥提高了油菜的干重,减少了铅在油菜中的吸收和积累,降低了铅对油菜的生物有效性和毒性.
[Abstract]:The effect and mechanism of heavy metal contaminated soil remediation by using papermaking sludge, an industrial solid waste, as a lead fixator was studied. The effects of papermaking sludge on the transformation of lead form in soil were studied by morphological extraction test. The mechanism of fixing lead in papermaking sludge was analyzed by X- ray photoelectron spectroscopy (X- ray photoelectron spectroscopy). Finally, the effect of paper sludge on remediation of lead-contaminated soil was evaluated by pot experiment of rapeseed. It was found that the addition of papermaking sludge significantly reduced the exchangeable and carbonate bound states of lead in soil and increased the organic bound state and iron manganese oxidation state, which indicated that papermaking sludge played a fixed role on lead in soil. After adding paper sludge, no PbCO_3 and PbS _ 3O _ H _ T _ 2C _ 3s _ T _ 2C _ 3s _ T _ 2 were detected in the soil after adding papermaking sludge. Instead, it was detected that PbC2H _ 3O _ 2S _ 2S _ 4 and [Pb_3Cl_2(HSCH_2C(NH_2)HCOO)_2], which explained the decrease of lead-carbonate binding state and the increase of lead organic binding state by adding sludge to the soil. The increase of the oxidation state of lead, iron and manganese can be explained by the shift of the characteristic peak of iron to the direction of high binding energy. The addition of papermaking sludge increased the dry weight of rape reduced the absorption and accumulation of lead in rape and reduced the bioavailability and toxicity of lead to rape.
【作者单位】：中国21世纪议程管理中心;北京大学环境工程系水沙科学教育部重点实验室;中国环境科学研究院城市水环境科技创新基地;中科院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室;
【基金】：国家水体污染控制与治理科技重大专项(2008ZX07212) 安徽省自然科学基金青年项目(1608085QF137)
【分类号】：X53

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