Study on enhancing chromium separation efficiency from tannery sludge by bioleaching
- Received Date: 18/03/2009
- Accepted Date: 15/11/2008
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Key words:
- leather making sludge /
- chromium /
- bioleaching /
- chemical leaching
Abstract: 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.
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