Leaching of heavy metals in sludge disposal

Author: Taida machine       Release time:2016-08-19
Reading guidance:If the excessive levels of heavy metals in the water, it will cause serious environmental pollution incidents, the world has several malignant incidents of environmental pollution, causing serious huma
    If the excessive levels of heavy metals in the water, it will cause serious environmental pollution incidents, the world has several malignant incidents of environmental pollution, causing serious human health hazards, it is due to excessive levels of heavy metals in the water. In the sludge containing heavy metals content of more, if not to stabilization of heavy metals in sludge may cause effect of sewage treatment can not well implemented.
   Heavy metals in sludge treatment of leaching method is control of heavy metals in sewage sludge are the two methods of, heavy metal leaching and fixation techniques on the contrary, the first increase in the acidic substances to reduce the sludge pH value to the heavy metals in the sludge transformation is dissolved, the leaching will be in the liquid removed. There are two methods of chemical leaching and bio leaching of heavy metal leaching.
To consider the effect of sludge on the chemical leaching by adding inorganic acid or acidic complex agent from the sludge dissolved heavy metals. Studies have showed that the nitrate leaching, Cu leaching rate can reach 86.7%, and Ni in the leaching rate can reach 100%. Although the study is very good, but from a practical, inorganic acid and complex agent not only economy, acidic substances also on Soil and water brings the serious influence. If only rely on acid to reduce sludge pH value of heavy metal sulfide into ionic state negative. If the chemical treatment process of hydrogen peroxide solution is added to improve the sludge of oxidation reduction potential, can improve the heavy metal leaching effect.
   Compared to the method of chemical leaching, bio leaching method has lower cost. Bio leaching is increasing sludge acid, but is using sulfur bacteria in the sludge to produce acid, and heavy metals from the solid state transformation soluble ionic state, thus from solid-phase sludge for the removal of heavy metals. In the domestic, sludge utilization of Thiobacillus mainly two kinds of Thiobacillus ferrooxidans and Thiobacillus thiooxidans Thiobacillus. These two fungi exist widely in most areas of our country, by converting sulfide forms of heavy metals to sulfate and leached out.  
    Sludge leaching method for removal of heavy metals in sludge have been long investigated, control is of heavy metals in sewage sludge are the two methods of. Chemical leaching filtration method and biological drain filter method each have advantages and disadvantages, and certain progress in the research of. Control of heavy metals in the sludge is very important, is to ensure that the basis for the treatment and disposal of sludge resource. Therefore, the sludge leaching method for control of heavy metals must get some attention.
 
   

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