What is environmentally friendly and comprehensive utilization of straw?
Some methods, such as ion exchange method and activated carbon process, do not directly produce sludge, but in some auxiliary parts of the process, such as the treatment of the regeneration liquid, sludge will also be produced. Because chemical method is regarded as one of the main treatment methods at home and abroad, the situation of electroplating sludge is very serious. According to the different treatment methods of electroplating wastewater, the electroplating sludge can be divided into two categories: mixed sludge and single sludge.
The characteristics of electroplating sludge and its harmfulness, most of the electroplating wastewater treatment methods will produce sludge, and chemical precipitation method is the main source of sludge.
The former is the different kinds of electroplating wastewater mixed together and the latter is the electroplating sludge; wastewater treatment were different and the formation of sludge, such as chromium sludge, sludge containing copper, nickel and zinc sludge sludge etc.. But, in fact, most of the wastewater from electroplating small enterprises is treated with mixed sludge. Therefore, the mixed sludge is the main target for the treatment and utilization of electroplating sludge. Production of electroplating wastewater treatment process of sludge containing heavy metals, it has the features of easy accumulation, unstable and easy loss, if not handled properly, arbitrary stacking, which is a direct consequence of sludge in Cu, Ni, Zn, Cr etc. these heavy metals in rainwater leaching. The sludge soil along the path of migration a crop a human body, and may cause secondary pollution of surface water, soil, groundwater, and even endanger the food chain, causing serious damage to the environment. According to the characteristics and harmfulness of electroplating sludge. From the point of view of environmental pollution prevention and recycling of resources, mainly adopts the following two ways, one is after the treatment, the sludge will cause two pollution and discarded and storage, it is harmless disposal; two is the comprehensive recovery of heavy metals in sludge resources that is, resource utilization. 2 harmless disposal of heavy metal sludge and harmless treatment of sludge treatment and disposal are prerequisite to realize the utilization of sludge.
