提高生物法分离制革污泥中铬分离效率的研究

Study on enhancing chromium separation efficiency from tannery sludge by bioleaching

在已确定污泥驯化最佳条件的基础上,通过改变滤材、液固分离条件,添加营养物质继续降低pH等方法,进行提高生物沥滤法分离制革污泥中铬的分离效率的研究。同时考察化学沥滤法(1∶1硫酸)在相同条件下的分离效率。试验结果表明:用相应pH值酸液(1∶1硫酸配制)淋洗,淋洗+闷洗和抽真空+酸液淋洗等过滤方式可提高铬的分离效率。生物沥滤中当pH值下降至1.8时,分离效率即可达到94.65%,与直接用蒸馏水淋洗相比要高得多。化学沥滤中当pH值下降到1时,分离效果可达96.7%,沥滤污泥中剩余铬含量可达到制革污泥农用标准。

The study on enhancing the heavy metal chromium separation efficiency in tannery sludge by bioleaching,through changing the filters material,the solid separation condition,as well as low pH nutrients and so on was carried out.The chromium separation efficiency of chemical leaching（1∶1 H2SO4） under the same condition was investigated.The experiment showed that it could enhance the separation efficiency with the acid liquor（1∶1 H2SO4 configuration）.In bioleaching when the pH dropped to 1.8,the separation efficiency could achieve 94.65%,compared to using the distilled water.In chemical leaching when the pH value dropped to 1,the separation efficiency could achieve 96.7%,the surplus chromium content in the sludge may achieve the standard of making the leather sludge as agriculture fertilizer.