In modern sewage treatment technology, phosphorus removal is a crucial link, it is not only related to water quality safety, but also directly affect the ecological balance of the environment. As an efficient phosphorus removal agent, polyferric sulfate is widely used in various sewage treatment systems because of its excellent phosphorus removal performance and good environmental adaptability. In this paper, the principle of phosphorus removal by polyferric sulfate is briefly introduced, and then the dosing methods and reasons in different positions are discussed in detail.
Principle of phosphorus removal by polymerized ferric sulfate
Polyferric Sulfate (PFS) is an inorganic polymer coagulant that rapidly adsorbs and precipitates phosphates in water through its unique bridging action and hydrolysis of polynuclear complex ions. Specifically, the hydrolysis reaction of PFS in water generates a variety of forms of iron hydroxide colloids, which carry a large number of positive charges and can efficiently neutralize the negatively charged phosphate ions in water to form insoluble iron phosphate precipitates, thus achieving the purpose of removing phosphate.
Pre-processing dosing
Pre-treatment dosing is the dosing of polyferric sulfate when the wastewater enters the front end of the treatment system. This addition method mainly utilizes the removal ability of physical treatment units such as grilles and sand settling ponds at the front end of sewage to remove suspended matter and large particles, so that PFS can contact phosphate dissolved in water more directly and effectively. In addition, the pre-treatment addition also helps to improve the phosphorus removal efficiency of subsequent treatment units and reduce the burden of subsequent biochemical treatment.
Biochemical tank feeding
The addition of polyferric sulfate to the biochemical tank is to remove phosphate by the synergistic effect of biological reaction and chemical coagulation. In this way, PFS can not only directly react with phosphate to form precipitation, but also improve the settling performance of sludge through its flocculation, which is conducive to the subsequent treatment of sludge. However, it is necessary to fully consider the effect of biochemical tank addition on biological activity, so as to avoid the destruction of microbial ecosystem due to excessive chemical agents and affect the stability of the entire wastewater treatment process.
Add sedimentation tank
Sedimentation tank addition is to directly add polyferric sulfate in the sedimentation tank, and use the water flow condition and standing time in the tank to make phosphate and PFS fully react and form insoluble precipitates. This method is suitable for large sewage treatment plants and can achieve efficient phosphorus removal effect. However, in order to avoid the increase of sludge production and the deterioration of effluent quality, the dosage and time of sedimentation tank dosing need to be precisely controlled.
Filter feeding
Filter addition is to add polyferric sulfate to the filter, through the void structure in the filter and the surface of the filter material, so that phosphate reacts with PFS and precipitates on the filter material. This dosing method is simple to operate, especially suitable for small sewage treatment systems. Filter dosing requires continuous dosing of chemicals to ensure continuous and stable phosphorus removal. At the same time, regular backwashing of the filter is also the key to maintaining its long-term operating efficiency.
conclusion
In summary, as a phosphorus removal agent, the dosing method of polyferric sulfate has advantages and disadvantages in different positions, and the choice of dosing method needs to be determined according to the specific situation and process requirements of the sewage treatment system. Through the scientific and reasonable dosing position and way, the phosphorus removal effect of polyferric sulfate can be maximized to ensure the efficient and stable operation of the sewage treatment process, and finally achieve the purpose of improving water quality and protecting the environment.
Focus on water treatment, just for a healthy world! Henan Hongze Environmental Protection Technology Co. is a professional enterprise engaged in the development, Water Treatment Chemicals，production and sales of polymer flocculants. The main products are "green water clean" brand polyaluminum chloride,
Polymerized Ferrous Sulfate，polyferric sulfate and other water purifiers. With an annual output of 10,000 tons, the products are sold all over the country, and actively explore the international market. The company will continue to uphold the business philosophy of "integrity, innovation and win-win", provide customers with quality products and services, and make due contributions to the society.
Henan Hongze Environmental Protection Technology Co., Ltd