生物沥滤-焚烧法处理制革污泥中铬迁移转化研究
Study on migration and transformation of Cr in tannery sldge treated with bioleaching-incineration technology
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摘要: 采用生物沥滤-焚烧方法,先将制革污泥中大部分难溶的有毒重金属——铬从固相溶出转移至液相，之后将沥滤后制革污泥进行有效的固液两相分离，并对分离后的固相污泥进行焚烧处理实验，研究生物沥滤焚烧处理法对制革污泥中的总Cr在不同介质中的浓度影响。结果表明，生物沥滤法处理制革污泥后，以金属离子交换形态存在的总Cr含量增加，其中68.56%的总Cr6+和87.70%的总Cr得以去除，去除效果十分明显；将沥滤脱水后的污泥进行焚烧处理，以残渣态形式存在的总Cr相对含量变大，迁移能力减弱； 铬在高温下与其他重金属元素形成复杂的金属化合物及络合物：Cr1.3Fe0.7O0.5、Na4（CrO4）（SO4）、Ca5（CrO4）3O0.5，有助于今后进一步对整个生物沥滤-焚烧处理过程进行反应机理研究。Abstract: Bioleaching-incineration technology was used to shift most of toxic metal element-Cr from solid to liquid,then the residue bioleaching sludge was incinerated after removing most of Cr with the membtane filtrating treatment.By the bioleaching-incineration test,concentration of total Cr distributed in different media was studied.The result showed that the relative concentration of total Cr presented as metal ion increased. About 68.56% of total Cr6+ and 87.70% of total Cr were removed. Residuals treated with bioleaching-dehydrated-incineration showed that the relative concentration of total presented as residual state increased,the migration of Cr was weaken.Under high temperature conditions,the complicated Cr compounds reacting with other heavy metals were formed. They were Cr1.3Fe0.7O0.5,Na4（CrO4）（SO4）,Ca5（CrO4）3O0.5 .It was helpful to understand the reaction mechanism of the bioleaching-incineration technology.
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Key words:
- tannery sludge /
- chromium /
- bioleaching /
- incineration /
- migration and transformation
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