Views: 184 Author: Site Editor Publish Time: 2021-05-20 Origin: Site
In the urbanization rate, the rate of industrialization, sewage quality and efficiency requirements and the comprehensive management of the water environment market together to stimulate the market space for sewage treatment will still be expanded. The current national vigorously develop the cause of environmental protection, "green water and green mountains is the silver mountain of gold" development concept, which is sufficient to show that China's determination to win and fight 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, domestic sewage and industrial sewage must implement strict discharge standards, do not meet the standards firmly can not be discharged to the public, at the same time, due to domestic sewage and industrial sewage, domestic sewage treatment plants and industrial sewage treatment plants exist between the essence of the difference, so industrial sewage should not be directly connected to the domestic sewage treatment plant To carry out sewage treatment work. The following article will detail the essential differences between domestic sewage treatment and industrial sewage treatment.
Sewage treatment principle
Domestic sewage treatment principle
The main purpose of domestic sewage treatment is to remove the COD organic matter in the water, mainly using biological methods and the use of activated sludge microorganisms for degradation, which is currently a more economical and compatible sewage treatment process, it is mainly through the water quality of domestic sewage, water quantity and different environmental conditions to judge, so as to select the sewage treatment process with far-reaching impact on investment and operating costs.
Industrial wastewater treatment principle
Industrial wastewater treatment mainly focuses on the chemical substances that seriously affect the environment, and the waste liquid discharged for comprehensive filtration. In addition to the sediment and slag, biological sludge is very important, too much sedimentation is not good to handle, and its water content is extremely high, and most of it occupies the space of the sewage pond, so it is necessary to give priority to this part of the treatment. The organic content in industrial sludge is too high, and it is easy to rot when it is placed for a little longer time, and the untimely treatment will cause secondary pollution, and the irritating smell produced will also affect the surrounding environment. In addition, industrial sludge floating will disrupt the normal work of sedimentation tanks and lead to deterioration of water quality. To prevent these phenomena, it is necessary to ensure the stable operation of industrial wastewater treatment plants on a daily basis.
The difference between domestic sewage treatment plant and industrial sewage treatment plant
(A) Different functions
Domestic sewage treatment plant: the main function is to provide the public with domestic sewage treatment services, the construction and development of domestic sewage treatment plant is an important guarantee for the development of urbanization, is an important support for the realization of the ecological development of the town.
Industrial sewage treatment plant: provide sewage treatment services for enterprises, institutions and other production operators, the construction and development of industrial sewage treatment plant is an important guarantee for the development of industrial parks and industrial cluster areas, and is an important support for the realization of the ecological development of industrial parks.
(II) the process is different
Domestic sewage treatment plant: domestic sewage treatment is mainly for the biochemical part, that is, biochemical treatment process, including conventional activated sludge treatment process, anaerobic - anoxic - aerobic method (A²O), anaerobic - anoxic (A/ O), sequential batch activated sludge method (SBR).
Industrial wastewater treatment plant: Industrial wastewater treatment mainly focuses on the chemical substances that seriously affect the environment, as well as the waste liquid discharged for comprehensive filtration. Compared with domestic wastewater, industrial wastewater is more complex in composition, more polluted, and more difficult to treat.
Industrial wastewater treatment corresponds to different industrial types of industry categories, and the pollutants contained in industrial wastewater from different processes in different industries are very different, and the cleaning treatment is also different. Compared to the domestic wastewater treatment plant is largely the same treatment process, industrial wastewater 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 the domestic wastewater treatment plant.
(iii) Different requirements for paying environmental protection tax
Domestic sewage treatment plant: According to Article 12 of the Environmental Protection Tax Law, the taxable pollutants discharged from domestic sewage treatment plants, which do not exceed the relevant national and local standards, are not subject to environmental protection tax. Those that exceed national and local emission standards do not meet the conditions for exemption from environmental protection tax and shall declare and pay environmental protection tax in accordance with the regulations.
Industrial wastewater treatment plants: There is no provision for exemption from environmental protection tax. However, according to Article 4 of the Environmental Protection Tax Law, enterprises, institutions and other production operators who discharge taxable pollutants into industrial wastewater treatment plants are not directly discharging pollutants into the environment and do not pay environmental protection tax on the corresponding pollutants.
With the strengthening of reform in the field of environmental protection, the project construction unit of pollutants to meet the standard discharge requirements of higher standards, which requires the project construction unit to enhance environmental awareness, strengthen communication with environmental protection authorities, so that construction projects to meet national and local environmental protection standards and requirements, the use of qualified sewage treatment equipment to make sewage stable and up to standard discharge, for the enterprise to correctly pretreat the sewage, in line with the standards of the pipe into the sewage treatment plant to provide protection.
In short, both domestic sewage treatment, or industrial sewage treatment, have its unique aspects, can not be confused, after all, the composition of industrial sewage is complex, the degree of pollution is also higher, the difficulty of treatment is also higher. However, this does not mean that domestic sewage is easy to deal with, there are still many areas of China's sewage treatment capacity is not perfect, 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 the combined analysis, only then can find a more reasonable method to achieve the desired treatment effect.