Industrial sewage treatment equipment according to the degree of processing points

The sewage treatment can be divided into primary treatment, two stage treatment and three stage treatment according to the degree of treatment. Primary treatment is to remove suspended solids in sewage, which are commonly used in physics. The BOD removal rate of primary treatment wastewater is only 20%, and still should not be discharged. Two stage treatment should be carried out. The main task of the two stage treatment is to remove large amounts of organic wastewater with colloid and dissolved state, and the removal rate of BOD is from 80% to 90%. Generally after two levels of sewage treatment can meet the discharge standards, commonly used biological membrane treatment. The purpose of the three stage treatment is to further remove some special pollutants, such as removal of fluorine and phosphorus, etc., which belong to the advanced treatment, and are often used in chemical treatment.

sewage disposal

With the level of social and economic development is different, the difference between the degree of industrialization of city sewage treatment in general can be divided into three categories: the first is to Beijing, Shanghai, Shenzhen and other economically developed city as the representative. Under the pull of a large amount of investment and construction, the sewage treatment of this kind of city has entered the stage of industrialization. Management of the market gradually profound understanding, not only concerned about the investment factors, pay more attention to the core goals of efficiency; industry related policies, the government regulation has been basically put in place; the traditional state-owned enterprises subject to complete the restructuring, improve the competitiveness of enterprises. The second category is Jiangsu, Zhejiang, Guangdong and other coastal areas have a certain economic base of the city, mostly introduced a number of policies to promote the city sewage treatment industry and market development, a clear direction of development; system gradually establish and perfect, the role of government supervision of assets and industry is gradually straighten out the present competition situation better; that has become the focus of regional investment. The third category is the mainland provinces and cities in the promotion of bonds and other national financial support policy, the requirements of the national sewage treatment industry policy, passive and active in the form of documents to confirm the direction of industrial development, and actively carry out the exploration of industrial investment as the main target of the sewage charges; established, traditional industries subject the lag of reform.