The treatment standards of domestic sewage treatment plants usually involve many aspects, including water quality indicators, treatment efficiency, environmental impact and operation management. The processing standards for these aspects are described in detail below.
1. Water quality indicators.
The main purpose of domestic sewage treatment equipment is to remove pollutants in sewage and discharge or reuse them after reaching certain water quality indicators. Common WQOs include:
1.Chemical oxygen demand (COD): indicates the content of organic matter in sewage, which is one of the important indicators to evaluate the effect of sewage treatment. In general, the COD value of treated domestic sewage should be less than 150mg L.
2.Biological oxygen demand (BOD): reflects the content of biodegradable organic matter in sewage, which is of great significance for evaluating the operation effect of sewage treatment equipment. In general, the BOD value of treated domestic sewage should be less than 30mg L.
3.Suspended solids (SS): Indicates the solid particles suspended in the sewage, and too high suspended solids content can adversely affect the environment. Therefore, the SS value of the treated domestic sewage should be less than 30 mg L.
4.Ammonia nitrogen (NH3-N): It is one of the common pollutants in sewage, and excessive ammonia nitrogen content can cause harm to aquatic organisms. The ammonia nitrogen content of treated domestic sewage should be less than 5mg l.
5.Total phosphorus (TP): It is an important indicator to evaluate the degree of eutrophication of water bodies. After domestic sewage treatment, the total phosphorus content should be less than 05mg/l。
Second, processing efficiency.
Treatment efficiency is a key indicator to evaluate the operation effect of domestic sewage treatment equipment. In general, the processing efficiency should meet the following standards:
1.COD removal rate: should not be less than 85%, that is, the COD content in the treated sewage should be reduced by more than 85% compared with before treatment.
2.BOD removal rate: should not be less than 90%, that is, the BOD content in the treated sewage should be reduced by more than 90% compared with before treatment.
3.Suspended solids removal rate: should not be less than 95%, that is, the content of suspended solids in the treated sewage should be reduced by more than 95% compared with before treatment.
4.Ammonia nitrogen removal rate: should not be less than 80%, that is, the ammonia nitrogen content in the treated sewage should be reduced by more than 80% compared with before treatment.
5.Total phosphorus removal rate: should not be less than 85%, that is, the total phosphorus content in the treated sewage should be reduced by more than 85% compared with before treatment.
3. Environmental impact.
The operation of domestic sewage treatment equipment should not cause adverse effects on the environment, such as noise, odor, secondary pollution, etc. Therefore, the treatment equipment should meet the following environmental impact criteria:
1.Noise: The noise generated during the operation of the treatment equipment shall comply with the relevant regulations of the local environmental protection department, generally not exceeding 60 decibels.
2.Odor: The odor generated during the treatment process should be effectively controlled to avoid adverse effects on the surrounding environment.
3.Secondary pollution: Sludge, waste residue and other wastes generated in the treatment process should be properly disposed of to avoid secondary pollution.
Buried integrated domestic sewage treatment equipment Fourth, operation management In order to ensure the normal operation and stable discharge of domestic sewage treatment equipment, operation management should also be strengthened to meet the following standards: 1Equipment maintenance: Regularly maintain and maintain the treatment equipment to ensure that the equipment is in good operating condition. 2.Record management: Establish a sound operation record management system, record the operating parameters of the processing equipment, water quality monitoring data and other information, so as to analyze the problem and optimize the operation. 3.Personnel training: Conduct regular training for the operators of the treatment equipment to improve their operational skills and environmental awareness. 4.Emergency plan: Formulate an emergency plan to deal with emergencies to ensure the normal operation of treatment equipment and the stable discharge of water quality. In short, the treatment standards of domestic sewage treatment equipment involve many aspects, and it is necessary to comprehensively consider factors such as water quality indicators, treatment efficiency, environmental impact and operation management. Only equipment that meets these standards can effectively remove pollutants from wastewater and protect the environment and human health.