Sewage treatment plants are important facilities for the treatment of urban sewage. One of the key issues is the removal of phosphorus from sewage to prevent its discharge from causing damage to the water environment. A phosphorus scavenger is a chemical added to a wastewater treatment system that effectively removes phosphorus from sewage. This article will introduce the types, characteristics and applications of phosphorus removers in sewage treatment plants.
Phosphorus removers in sewage treatment plants are mainly divided into two categories: chemical phosphorizers and biological phosphor removers.
Chemical phosphorus remover is a method of removing phosphorus by combining it with other substances in sewage to form a precipitate through a chemical reaction. Common chemical phosphorus removers include iron hydroxide, ferric chloride, polymerized aluminum, etc. These chemicals react with phosphate to form insoluble precipitates that transfer phosphorus from wastewater to sludge or sediment.
Biological phosphorus removers use the action of specific microorganisms to remove phosphorus from sewage. These microorganisms can convert dissolved phosphate into insoluble phosphate under specific environmental conditions, thereby achieving the effect of phosphorus removal. Common biological phosphorus removers include nitrifying phosphorus removers and nitrification denitrification phosphor removers.
Chemical and biological phosphorus removers have their own characteristics.
The advantage of chemical phosphorus remover is that the phosphorus removal effect is fast, and it is suitable for situations with high requirements for phosphorus removal. It quickly removes phosphorus from the effluent and forms a sediment that facilitates subsequent treatment. However, chemical phosphorus removers also have disadvantages, such as frequent dosing, high operational requirements, and high by-product disposal costs.
The advantages of biological phosphorus scavengers are lower investment and operating costs, and fewer by-products. It can use the action of microorganisms to convert phosphorus into insoluble salts and deposit, which can be achieved in a submarine-style aeration tank. However, biological phosphorus scavengers require long treatment times and are highly demanding in terms of environmental conditions.
The application of phosphorus remover in sewage treatment plant is of great significance.
In terms of chemical phosphorus removers, iron hydroxide is widely used in industry because of its good phosphorus removal effect and easy to use. Ferric chloride and polyaluminium are also commonly used in small and medium-sized wastewater treatment plants. Rational use of chemical phosphorus removers can improve the effect of phosphorus removal and reduce sludge formation.
In terms of biological phosphorus removers, nitrification phosphorus removers and nitrification denitrification phosphorus removers are widely used in large-scale sewage treatment plants. These agents promote the growth of specific microorganisms that remove phosphorus during wastewater treatment. In addition, biological phosphorus removers help to improve the stability and removal of treatment systems.
Phosphorus removers in sewage treatment plants play an important role in protecting the water environment and improving the effect of sewage treatment. Chemical phosphorus remover and biological phosphoryl remover have their own characteristics, and the appropriate phosphor remover can be selected according to the actual situation. Rational use of phosphorus removers can improve the effect of phosphorus removal and reduce treatment costs.