Present situation of urban sewage treatment in China

With the rapid development of the first activated sludge as the process of the sewage plant in our country, the large-scale urban sewage plant began to operate, marking the rapid development of China's urban sewage industry. The basic treatment method of early urban sewage in our country is to trim the suburban pits and depressions, swamps or waste rivers, and to build a stable pond by dam. The traditional activated sludge method is the earliest study of sewage treatment in China, and has been applied in engineering on the basis of research. This method can obtain good effluent quality at low cost, and is the treatment process used by most of the urban sewage plants in China. The biochemical treatment process based on traditional activated sludge process, contact oxidation process, oxidation ditch process and AB process has been widely used in China because of its advantages of stable effect, easy operation and management, and low cost.

With the acceleration of China's urbanization process, the problem of urban water pollution is becoming more and more prominent, and the discharge of urban sewage shows an increasing trend. According to incomplete statistics, small and medium-sized towns account for 30% of the total urban sewage discharge.

The construction and operation of a large number of new sewage treatment plants reflects China's attention to the problem of urban sewage, and also shows the government's determination to improve the status quo of urban sewage. More than 90% of China's cities have built sewage treatment plants, as of the end of 2010, China's urban domestic sewage treatment capacity has reached 125 million m3/d, urban sewage treatment rate has reached 77.5%, in 2014, China's urban sewage treatment plants A total of more than 3,900, the daily treatment capacity of 155 million m3/d, of which 860 first-class A projects, Daily processing capacity 29.25 million m3. In recent years, Liaoning Province alone has built many sewage plants of different sizes, and the sewage has been treated to a certain extent, but the task of treating sewage is still quite heavy.

Relevant national standards for secondary sewage treatment plant effluent water quality requirements, with the "Twelfth Five-Year" energy conservation and emission reduction goals to promote, China's urban sewage treatment plant effluent water quality standards continue to improve, "urban sewage treatment plant pollutant discharge standards", urban sewage treatment plant effluent into the key river basins determined by the state and province and lakes, reservoirs and other closed, semi-closed waters, Implementation of Level 1 A standards. Due to the pressure of policy and environment, it is imperative to upgrade the standard of the municipal sewage treatment plant built in the early stage based on the traditional activated sludge process.

With the rapid development of the first activated sludge as the process of the sewage plant in our country, the large-scale urban sewage plant began to operate, marking the rapid development of China's urban sewage industry. The basic treatment method of early urban sewage in our country is to trim the suburban pits and depressions, swamps or waste rivers, and to build a stable pond by dam. The traditional activated sludge method is the earliest study of sewage treatment in China, and has been applied in engineering on the basis of research. This method can obtain good effluent quality at low cost, and is the treatment process used by most of the urban sewage plants in China. The biochemical treatment process based on traditional activated sludge process, contact oxidation process, oxidation ditch process and AB process has been widely used in China because of its advantages of stable effect, easy operation and management, and low cost.

With the acceleration of China's urbanization process, the problem of urban water pollution is becoming more and more prominent, and the discharge of urban sewage shows an increasing trend. According to incomplete statistics, small and medium-sized towns account for 30% of the total urban sewage discharge.

The construction and operation of a large number of new sewage treatment plants reflects China's attention to the problem of urban sewage, and also shows the government's determination to improve the status quo of urban sewage. More than 90% of China's cities have built sewage treatment plants, as of the end of 2010, China's urban domestic sewage treatment capacity has reached 125 million m3/d, urban sewage treatment rate has reached 77.5%, in 2014, China's urban sewage treatment plants A total of more than 3,900, the daily treatment capacity of 155 million m3/d, of which 860 first-class A projects, Daily processing capacity 29.25 million m3. In recent years, Liaoning Province alone has built many sewage plants of different sizes, and the sewage has been treated to a certain extent, but the task of treating sewage is still quite heavy.

Relevant national standards for secondary sewage treatment plant effluent water quality requirements, with the "Twelfth Five-Year" energy conservation and emission reduction goals to promote, China's urban sewage treatment plant effluent water quality standards continue to improve, "urban sewage treatment plant pollutant discharge standards", urban sewage treatment plant effluent into the key river basins determined by the state and province and lakes, reservoirs and other closed, semi-closed waters, Implementation of Level 1 A standards. Due to the pressure of policy and environment, it is imperative to upgrade the standard of the municipal sewage treatment plant built in the early stage based on the traditional activated sludge process.