皂角苷和柠檬酸联合去除厌氧消化污泥中重金属的研究

发布时间：2018-09-01 13:24

【摘要】：以武汉某污水处理厂未厌氧消化与厌氧消化的污泥(分别为S1和S2)为研究对象,通过振荡淋洗实验,研究了皂角苷(质量分数0.1%~2.0%)和柠檬酸(0~1 mol·L~(-1))联合对2种污泥中Ni、Pb、Zn的去除效果,确定皂角苷和柠檬酸联合淋洗的最佳浓度组合,并采用BCR连续提取法分析淋洗前后3种重金属的形态变化.结果表明,皂角苷和柠檬酸联合对污泥中3种重金属均有较好的去除效果,Ni、Pb、Zn的最高总去除率分别为76.02%、59.93%和15.94%.综合分析,1%的皂角苷与0.4 mol·L~(-1)的柠檬酸联合淋洗的去除效果最好,2种污泥中重金属去除率的大小均为未厌氧消化污泥(S1)厌氧消化污泥(S2).与未厌氧消化污泥相比,厌氧消化污泥Ni的残渣态、Pb的可还原态及Zn的可氧化态含量明显增加,而Ni的可还原态含量减少.联合淋洗后S1、S2中约80%的酸溶态和可还原态的Ni、Zn被去除,Pb的可还原态分别去除67.07%和58.06%;且各重金属残渣态所占比例大幅度增加,其中,Pb的增加最为明显,所占比例超过90%.
[Abstract]:The removal of Ni,Pb,Zn from unanaerobic and anaerobic sludge (S1 and S2) of a wastewater treatment plant in Wuhan was studied by oscillatory leaching experiment. The Ni,Pb,Zn removal effects of saponins (0.1 ~ 2.0%) and citric acid (0.1 mol L ~ (-1) on the removal of Ni,Pb,Zn from two kinds of sludge were studied. The optimum concentration combination of saponin and citric acid was determined and the morphological changes of three heavy metals before and after elution were analyzed by BCR continuous extraction method. The results showed that the highest total removal efficiency of the three heavy metals in sludge was 76.02% and 15.94%, respectively, when the mixture of saponins and citric acid was used to remove the three heavy metals. The removal rate of heavy metals in the two kinds of sludge was the best. The removal rate of heavy metals in the two sludge was the same as that of the anaerobic digested sludge (S1) and the anaerobic digested sludge (S2). Compared with non-anaerobic digested sludge, the content of residual Pb and oxidizable state of Zn in anaerobic digested sludge increased significantly, but the content of Ni decreased. After combined leaching, about 80% of the acid soluble and reducible Ni,Zn in S _ 1 / S _ 2 were removed 67.07% and 58.06%, respectively, and the proportion of heavy metal residues increased greatly, among which the increase of Pb content was more than 90%.
【作者单位】：华中农业大学农业部长江中下游耕地保育重点实验室;农业部产地环境质量重点实验室/天津市农业环境与农产品安全重点实验室;
【基金】：公益性行业科研专项(No.201303101) 农业部环境保护科研监测所省部级重点实验室开放基金~~
【分类号】：X703

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