Which treatment process can be applied to rural domestic sewage treatment to meet the standard of Class A A.
The standards for domestic sewage treatment and discharge are as follows:
1.Effluent Water Quality Standards:
Chemical Oxygen Demand (COD): The effluent COD concentration should be less than 30 mg L to ensure that organic matter is effectively removed.
Biochemical Oxygen Demand (BOD): The BOD concentration of the effluent should be less than 10mg L to ensure that the organic matter in the wastewater is fully degraded.
Ammonia nitrogen: The concentration of ammonia nitrogen in the effluent should be less than 5mg l to avoid pollution to the water body.
Total phosphorus: The total phosphorus concentration in the effluent should be less than 1 mg l to prevent the occurrence of eutrophication.
Total nitrogen: The total nitrogen concentration in the effluent should be less than 15 mg l to reduce the impact on the water ecosystem.
Suspended solids: The concentration of suspended solids in the effluent should be less than 10mg l to ensure the transparency and water quality of the water body.
2.Treatment Process Standards:
Pretreatment: Domestic wastewater treatment should include pretreatment processes, such as grids, grit tanks, etc., to remove large particulate matter and sediments.
Deodorization: The treated sewage can be deodorized by physical, chemical or biological methods to reduce the generation of odor.
In addition, according to the environmental function and protection objectives of the urban sewage treatment plant discharged into the surface waters, as well as the treatment process of the sewage treatment plant, the standard values of conventional pollutants of the basic control items are divided into first-class standards, second-level standards, and first-class standards. The specific implementation of which standard also needs to consider factors such as the treatment process of the sewage treatment plant and the environmental function of the discharge into the water.
3.Emission Standards:
According to the relevant national laws and regulations, the discharge standards after domestic sewage treatment are divided into first-class, second-class and first-class standards. The first-class standard is the most stringent and applies to the protection of the water quality of important rivers and lakes; The secondary standard is applicable to the water quality protection of general rivers and lakes; **The standard is applicable to the water quality requirements for discharge into general ditches, farmland irrigation, etc.
4.Environmental monitoring:
During the operation of the sewage treatment plant, environmental monitoring should be carried out regularly to ensure that the effluent quality meets the standards. The monitoring items should include chemical oxygen demand, biochemical oxygen demand, ammonia nitrogen, total phosphorus, total nitrogen, suspended solids and other indicators. At the same time, toxic and harmful substances should also be monitored to ensure that the effluent from the sewage treatment plant does not cause harm to the surrounding environment and human health.
5.Sustainability:
Domestic wastewater treatment should not only focus on the discharge standard after treatment, but also pay attention to the sustainability of the entire treatment process. This includes factors such as energy consumption, water use, treatment efficiency, etc. Through the use of advanced sewage treatment technology and technology, we can achieve more efficient, energy-saving and environmentally friendly sewage treatment, and contribute to the construction of a beautiful China.
In short, domestic sewage treatment is an important environmental protection work, which needs to be carried out in strict accordance with relevant laws, regulations and standards. Through scientific treatment technology and effective monitoring methods, we can ensure that the treated water quality meets the discharge standard and contribute to the protection of the environment and water resources.