Phosphorus in water will accelerate the eutrophication of water. This phenomenon is more serious in China, and it has brought great harm to industries, aquaculture, agriculture and tourism. Therefore, how to effectively reduce the concentration of phosphorus in sewage is of significance to protect the environment. Phosphorus emissions from factories mainly come from fertilizers, medicine, metal surface treatment etc, for example, electroplating wastewater, pharmaceutical wastewater, papermaking wastewater, etc.
Regarding phosphorus sewage disposal technologies mainly include biological method and physical chemical method. The biological method is mainly suitable for treating organic phosphorus wastewater with low-concentration. The physical chemical method is mainly used for treating inorganic phosphorus wastewater. For physicochemical method, the most important reaction is using calcium (slag or lime) to remove phosphorus elements. Calcium ions react with phosphate to form a precipitate. The specific reaction is as follows:
In the process of wastewater treatment, with lime, the amount of sludge generated is large, so pls ensure discharge sludge frequently to avoid pipe block. After the sludge concentration, the bottom thick sludge will be pumped into the plate frame filter press to separate the solid and liquid, and finally the dry cakes are transported away for dry stack and the water will be recycled.