With the promotion of urbanization rate and industrialization rate, the requirement of improving the quality and efficiency of sewage and the market of comprehensive water environment treatment, the market space of sewage treatment will still be expanded. It is estimated that more than 100 billion yuan of market investment demand will be ushered in during the "14th five year plan" period. At present, the state vigorously develops the cause of environmental protection, and puts forward the development concept of "green water and green mountains are golden mountains and silver mountains", which is enough to show China's determination to win the battle of environmental protection.

Sewage treatment can be divided into domestic sewage treatment and industrial sewage treatment. According to China's environmental laws and regulations, both domestic sewage and industrial sewage must implement strict discharge standards. If they fail to meet the standards, they must not be discharged. At the same time, there are essential differences between domestic sewage and industrial sewage, and between domestic sewage treatment plant and industrial sewage treatment plant, Therefore, industrial sewage should not be directly connected to domestic sewage treatment plant for sewage treatment. The following will introduce the essential difference between domestic sewage treatment and industrial sewage treatment in detail.

Principle of sewage treatment

Principle of domestic sewage treatment

The main purpose of domestic sewage treatment is to remove COD organic matter in water, which is mainly degraded by biological method and microorganism in activated sludge. At present, it is an economical and well compatible sewage treatment process, which is mainly judged by the quality, quantity and different environmental conditions of domestic sewage, Thus, the wastewater treatment process with far-reaching influence on investment and operation cost is selected.

Principle of industrial wastewater treatment

Industrial wastewater treatment is mainly aimed at the chemical substances that seriously affect the environment, as well as the discharged waste liquid for comprehensive filtration. In addition to the sediment and grid slag, biological sludge is very important. Excessive precipitation is not easy to treat, and its water content is very high, most of which occupy the space of the sewage pool, so priority should be given to this part of things. However, the organic matter in industrial sludge is too high, and it is prone to corruption if it is placed for a little longer. If it is not handled in time, it will cause secondary pollution, and the pungent odor will affect the surrounding environment. In addition, the floating of industrial sludge will destroy the normal operation of the sedimentation tank, leading to the deterioration of water quality. In order to prevent these phenomena, we must ensure the stable operation of the industrial sewage treatment plant every day.

Difference between domestic sewage treatment plant and industrial sewage treatment plant

（1） Different functions

Domestic sewage treatment plant: its 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 the development of urbanization and an important support for the realization of urban ecological development;

Industrial sewage treatment plant: it provides sewage treatment services for enterprises, institutions and other producers and operators. The construction and development of industrial sewage treatment plant is an important guarantee for the development of industrial parks and industrial clusters, and an important support for the ecological development of industrial parks.   （ 2） The process is different

Domestic sewage treatment plant: domestic sewage treatment is mainly aimed at the biochemical part, i.e. biochemical treatment process, including conventional activated sludge treatment process, anaerobic anoxic aerobic process (A ² O) Anaerobic anoxic (A / O), sequencing batch reactor (SBR).

Industrial wastewater treatment plant: industrial wastewater treatment is mainly aimed at the chemical substances that seriously affect the environment, as well as the discharged waste liquid for comprehensive filtration. Compared with domestic sewage, the composition of industrial sewage is more complex, the degree of pollution is higher, and the difficulty of treatment is higher.

Industrial wastewater treatment corresponds to different types of industries. The pollutants contained in industrial wastewater produced by different processes in different industries vary greatly, so the cleaning treatment is also different. Compared with the same treatment process of domestic sewage treatment plant, industrial sewage treatment plant has its own characteristics. It is impossible to treat all industrial sewage by only one treatment process, which is the most essential difference from domestic sewage treatment plant.

（3） The requirements for paying environmental protection tax are different

Domestic sewage treatment plant: according to Article 12 of the environmental protection tax law, if the taxable pollutants discharged by the domestic sewage treatment plant do not exceed the relevant national and local standards, no environmental protection tax shall be paid. Those who 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 sewage treatment plant: there is no provision for reducing or exempting environmental protection tax. However, according to Article 4 of the environmental protection tax law, enterprises, institutions and other producers and operators who discharge taxable pollutants to the industrial sewage treatment plant are not directly discharging pollutants to the environment and do not pay the environmental protection tax on the corresponding pollutants.

summary

With the enhancement of the reform in the field of environmental protection, higher standard requirements are put forward for the pollutant discharge standard of the project construction unit, which requires the project construction unit to enhance the awareness of environmental protection, strengthen the communication with the competent department of environmental protection, so as to make the construction project meet the national and local environmental protection standards and requirements, and adopt qualified sewage treatment equipment to make the sewage discharge standard stable, It can provide guarantee for enterprises to correctly pretreat the sewage and enter the sewage treatment plant in accordance with the pipe standard.

In a word, both domestic sewage treatment and industrial sewage treatment have their unique aspects, which can not be confused. After all, the composition of industrial sewage is complex, the degree of pollution is relatively high, and the difficulty of treatment is also higher. However, this does not mean that domestic sewage is easy to be treated. At present, the sewage treatment capacity of many areas in China is not perfect, and there is still much room for improvement. In the use of different methods and processes, must be combined with the site situation, construction cost and other aspects of the analysis, only in this way can we find a more reasonable method to achieve the ideal treatment effect.

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