In the "black list of priority pollutants in China's environment", chromium is one of the heavy metals that are prioritized for control. Chromium pollution is mainly caused from electroplating, tanning, printing and dyeing and other industries, the source of chromium-containing tanning sludge 1: chromium tanning wastewater sludge produced by alkaline precipitation, usually the tanning process, after the chromium tanning process, the incomplete absorption of chromium will enter into the solution system, resulting in chromium-containing wastewater, which is a lot of things can be recycled chromium to be cleaned up, the general process is to chromium-containing wastewater filtered with a grille, to remove the Floating and suspended matter, the wastewater into the catchment basin, and then after the pump lift into the alkali precipitation reaction pool, add alkali, after sufficient precipitation for separation, precipitation for dehydration, and then acidification back to the chrome tanning. 2: integrated wastewater biological treatment process for integrated treatment, leather water treatment process to mix the wastewater, respectively, after a aerobic biochemical treatment and secondary anaerobic biochemical treatment, because of the high content of chromium, this Sludge can not be used in other areas, and can not be landfilled.
Chromium-containing skin incineration technology, at high temperatures (800~1000c°), through combustion, so that the combustible components of solid waste into an inert residue, while recovering thermal energy; through combustion, solid waste can be made to further reduce the volume can be reduced by 80% to 90%, the weight will be reduced by 75% to 80%. Incineration oxidation technology is mainly used for culling solid waste leather chips, is the realization of hazardous waste reduction, harmlessness of the most rapid and effective technology, can completely eliminate a large number of harmful organic and pathogens (such as bacteria, viruses, parasites, eggs, etc.) in the tannery sludge, relatively speaking, the treatment cost is high, but also oxidative incineration of chromium sludge. Carry out safe landfill technology. Shanghai Heavy Metal Recycling and Disposal Company is to do this!