The purpose of water treatment is to waste water pollution in some way virus separated, or its decomposition into harmless and stable substances, so that the sewage is purified. Generally to achieve the prevention of poison and bacteria infection; to avoid the smell of different smell and a sense of evil objects to Suzhou graphite modified polypropylene heat exchanger professional manufacturers to meet the requirements of different uses.
Waste treatment is the basic method is the use of physical, chemical or biological methods, or several methods used in conjunction with the removal of harmful substances in wastewater, according to the water quality and treatment of the fate of the water to determine the extent of its treatment, wastewater treatment can generally be divided into one, Secondary and tertiary treatment.
The basic methods of wastewater treatment are as follows: (1) The primary treatment adopts the physical treatment method, that is to remove the solid suspended matter and oil slick in the wastewater by grating, screen, settling pond, PH, reduce the degree of corrosion of wastewater. Wastewater after primary treatment, generally not meet the emission standards (BOD removal rate of only 25-40%). It is usually a pre-treatment stage, in order to reduce the load of the subsequent treatment process and improve the treatment effect.




The basic methods of wastewater treatment: (2) secondary treatment is the use of biological treatment methods and some chemical methods to remove biodegradable organic wastewater and some colloidal pollutants. After secondary treatment, the removal rate of BOD in wastewater can reach 80-90%, that is, the BOD can be lower than 30mg / L. After secondary treatment of Suzhou graphite modified polypropylene heat exchanger professional manufacturers of water, generally up to the agricultural irrigation standards and wastewater discharge standards, so the secondary treatment is the main body of wastewater treatment. However, after secondary treatment of the water still retain a certain amount of suspended solids, biological decomposition of dissolved organic matter, dissolved inorganic and nitrogen and phosphorus algae and other nutrients, and contain viruses and bacteria. And therefore can not meet the requirements of higher emission standards, such as discharged into the flow after the smaller, less dilution of the river may cause pollution, can not be directly used for tap water, industrial water and groundwater recharge water.


(3) tertiary treatment is to further remove the secondary treatment can not remove the pollutants, such as phosphorus, nitrogen and biodegradable organic pollutants, inorganic pollutants, pathogens and so on. The three-stage treatment of wastewater is based on the secondary treatment, and further uses chemical methods (chemical oxidation, chemical precipitation, etc.), physical and chemical methods (adsorption, ion exchange, membrane separation technology) to remove some specific pollutants Depth processing "approach. Clearly, the tertiary treatment of waste water is costly, but can make full use of water resources.
Wastewater treatment is quite complex, the choice of treatment methods must be based on the quality and quantity of waste water discharged to the Suzhou graphite modified polypropylene heat exchanger manufacturers to accept the use of water or water to consider. At the same time should also consider the waste water treatment process generated sludge, residue treatment and use of possible secondary pollution problems, and the flocculant recycling. Commonly used wastewater treatment basic methods can be divided into the following categories:
The basic method of wastewater treatment: (1) Physical method: The choice of wastewater treatment method depends on the nature of the pollutants in the wastewater, composition, status and water quality requirements. General wastewater treatment methods can be broadly divided into physical, chemical and biological Suzhou graphite modified polypropylene heat exchanger professional manufacturers law three categories.