What is the difference between domestic sewage and industrial sewage treatment?

What is the difference between domestic sewage and industrial sewage treatment?

Driven by the urbanization rate, industrialization rate, sewage quality and efficiency requirements, and the comprehensive water environment management market, the sewage treatment market space will continue to expand. At present, the country vigorously develops the cause of environmental protection, and the development concept of "clear water and green mountains are gold hills and silver mountains" is enough to show China's determination to win the battle against environmental protection.

Sewage treatment can be divided into domestic sewage treatment and industrial sewage treatment, according to China's environmental protection laws and regulations, domestic sewage and industrial sewage must implement strict discharge standards, do not meet the standard resolutely can not be discharged to society, at the same time, because of domestic sewage and industrial sewage, domestic sewage treatment plant and industrial sewage treatment plant there is an essential difference between. Therefore, industrial sewage should not be directly connected to domestic sewage treatment plants for sewage treatment. The following article will introduce in detail the essential differences between domestic sewage treatment and industrial sewage treatment.

Principle of sewage treatment

Principles of domestic sewage treatment

The main purpose of domestic sewage treatment is to remove COD organic matter in the water, mainly using biological method and the use of activated sludge microbial degradation, is the current more economical and compatible sewage treatment process, mainly through the water to domestic sewage water quality, water quantity and different environmental conditions to judge, so as to choose the investment and operating costs of far-reaching impact on the sewage treatment process.

Principles of industrial wastewater treatment

Industrial wastewater treatment is mainly aimed at the chemical substances that seriously affect the environment and the discharged waste liquid for comprehensive filtration. In addition to sediment and slag, biological sludge is very important, too much precipitation is not good to deal with, and the water content is very high, and most of the sewage tank space, so it is a priority to treat this part of the treatment. The content of organic matter in industrial sludge is too high, the placement time is a little longer, it is easy to rot, and the treatment will cause secondary pollution, and the pungent odor will also affect the surrounding environment. In addition, the floating of industrial sludge will disturb the normal operation of the sedimentation tank, leading to the deterioration of water quality.

The difference between domestic sewage treatment plant and industrial sewage treatment plant

(1) Different functions

Domestic sewage treatment plant: The main function is to provide domestic sewage treatment services for the public. The construction and development of domestic sewage treatment plant is an important guarantee for urbanization development and an important support for ecological development. Small town.

Industrial sewage treatment plant: to provide sewage treatment services for enterprises and public institutions and other producers and operators, the construction and development of industrial sewage treatment plants is an important guarantee for the development of industrial parks and industrial clusters, and an important support for the realization of industrial sewage treatment plants. Ecological development of industrial park.

(2) Different processes

Domestic sewage treatment plant: Domestic sewage treatment is mainly biochemical part, that is, biochemical treatment process, including conventional activated sludge treatment process, anaerobic-anoxic-aerobic method (A²O), anaerobic-anoxic (A/O), sequencing batch activated sludge method (SBR).

Industrial wastewater treatment plant: Industrial wastewater treatment is mainly for chemical substances that seriously affect the environment, as well as the discharge of waste liquid comprehensive filtration. Compared with domestic wastewater, the composition of industrial wastewater is more complex, the pollution is more serious, and the treatment is more difficult.

Industrial wastewater treatment corresponds to different industrial types and industry categories, and the pollutants contained in industrial wastewater of different processes in different industries are very different, and the cleaning treatment is also different. Compared with the treatment process of domestic sewage treatment plants, industrial sewage treatment plants have their own characteristics, it is impossible to rely on only one treatment process to treat all industrial wastewater, which is the most essential difference with domestic sewage treatment plants.

(3) Environmental tax payment requirements are different

Domestic sewage treatment plants: According to the provisions of Article 12 of the Environmental Protection Tax Law, where the taxable pollutants discharged by domestic sewage treatment plants do not exceed the relevant national and local standards, environmental protection tax shall not be levied. Those that exceed the national and local emission standards and do not meet the conditions for exemption from environmental protection tax shall declare and pay environmental protection tax in accordance with the provisions.

Industrial wastewater treatment plants: There is no exemption from the environmental tax. However, according to the provisions of Article 4 of the Environmental Protection Tax Law, enterprises, public institutions and other producers and business operators that discharge taxable pollutants to industrial sewage treatment plants are not directly discharging pollutants to the environment and do not pay environmental protection taxes on the corresponding pollutants.

With the strengthening of the reform in the field of environmental protection, the pollutants of the project construction unit must meet higher standards of discharge requirements, which requires the project construction unit to enhance environmental awareness, strengthen communication with the environmental protection department, so that the construction project can meet the national and local environmental standards and requirements, use qualified sewage treatment equipment, make the sewage stable discharge standards, and correctly treat sewage for enterprises. Standard piping into the wastewater treatment plant to provide protection.

In short, whether it is domestic sewage treatment, or industrial sewage treatment, have their own unique aspects, can not be confused, after all, the composition of industrial sewage is complex, the degree of pollution is also high, and the treatment difficulty is also high. However, this does not mean that domestic sewage is easy to treat, China's sewage treatment capacity is still imperfect in many places, and there is more room for improvement. In the use of different methods and processes, it is important to combine the site conditions, construction costs and other aspects of a comprehensive analysis in order to find a more reasonable way to achieve the expected treatment effect.