外源添加Fe^(2+)对生物沥浸处理制革污泥的影响  

Effect of the addition of Fe^(2+) on tannery sludge bioleaching

作　　者：刘秀海[1] 周立祥[1] 刘奋武[1] 廖岳华[1] 王世梅[1] 

机构地区：[1]南京农业大学资源与环境科学学院环境工程系,南京210095

出　　处：《环境科学学报》2009年第2期318-322,共5页Acta Scientiae Circumstantiae

基　　金：国家高技术研究发展计划(863)项目(No.2006AA03Z314);国家自然科学基金项目(No.20177016)~~

摘　　要：利用嗜酸性硫杆菌复合菌群,通过摇瓶试验对制革污泥进行生物沥浸,研究了在以硫粉作为底物的基础上,添加不同量的Fe2+对污泥生物沥浸效果的影响.结果表明,在制革污泥生物沥浸处理中,外源添加Fe2+虽有助于加快生物酸化进程,特别是在pH>2的阶段该作用较为明显,但由于也促进了羟基硫酸高铁沉淀的生成,导致已溶出的Cr3+部分被重新固持,因此,在制革污泥生物沥浸中外源加Fe2+促进Cr溶出的效果并不明显.此外,外源添加Fe2+在较小程度上可降低污泥的比阻值,从而使污泥更易脱水,但Fe2+不同添加量之间差异较小.综合考虑药剂成本和处理效率,在制革污泥生物沥浸中添加Fe2 +对大幅度加快Cr溶出速率和显著提高污泥脱水性并没有理想效果.The aim of the present study was to investigate effect of different concentrations of Fe^2＋ on tannery sludge bioleaching efficiency with a focus on Cr solubilization and sludge dehydration. Tannery sludge bioleaching using combined indigenous iron- and sulfur-oxidizing bacteria was conducted in a batch flask experiment in which 4 g·L^-1 of S powder combined with different amounts of Fe1＋ （0-6 g·L^-1 ） as FeSOg4·7H2O were added and acted as the energy substrate. Results showed that the addition of Fe^2＋ to the sludge bioleaching system accelerated acid production in the regime of pH 〉 2, in comparison to the control without added Fe^2＋ . However, the increase of Fe^2＋ resulted in more ferric precipitates in the bioleached sludge by which, in turn, soluble Cr^3＋ might be re-attenuated through co-precipitation. Thus, the solubilization efficiency of sludge-born Cr facilitated by the addition of F^2＋ hardly differed from that in the control. Also, the addition of Fe^2＋ improved, to a lesser extent, sludge dehydration The Fe^2＋ added sludge exhibited a lower specific resistance compared to the control. In the light of the cost of the chemical agent （ FeSO4·7H2 O） and the bioleaching efficiency after the addition of Fe^2＋ , it was concluded that addition of Fe^2＋ is perhaps unnecessary for tannery sludge bioleaching, as it does not significantly improve Cr solubilization or sludge dehydration.

关 键 词：制革污泥 生物沥浸 亚铁 CR 比阻 

分 类 号：X703[环境科学与工程—环境工程]