Effluent water quality standard of sewage treatment plant

Sewage treatment indicators of sewage treatment plant: chemical oxygen demand (COD)≤50 mg/L, biochemical oxygen demand (BOD)≤ 10 mg/L, suspended solids (SS)≤ 10 mg/L, total nitrogen (calculated as n) ≤ 15 mg/L, and ammonia nitrogen.

The effluent from the sewage treatment station shall conform to the current national standard "Discharge Standard of Pollutants for Urban Sewage Treatment Plants" (GB18918-2002); When the effluent from sewage treatment station is used for farmland irrigation, it should comply with the relevant provisions of the current national standard "Water Quality Standard for Farmland Irrigation" (GB5084-2005). There are many methods for sewage treatment and utilization, and the following factors should be considered when selecting the scheme:

1, environmental protection requirements for sewage treatment.

2. Quantity and quality of sewage.

3. Investment ability. Sewage treatment technology is to separate pollutants contained in sewage by various methods, or convert pollutants into harmless substances, thus purifying sewage.

Extended data:

Harmful substances in sewage will not be discharged at will. From now until1October 27th 10, the newly revised Beijing local standard "Discharge Standard of Water Pollutants" is open for comments on the website of the Municipal Bureau of Quality Supervision, and it is planned to add 25 water pollutant control indicators. After the implementation of the new standard, the existing units should reach the standard before July 20 14.

Compared with the current standard, this opinion draft has adjusted the application scope of the standard, stipulating that the water pollutant discharge, environmental impact assessment of construction projects, design of environmental protection facilities, completion acceptance and post-production discharge management of all sewage disposal units except sewage treatment plants and medical institutions within the jurisdiction of Beijing are all within this scope.

The biggest change is that in 2005, according to the direction of sewage discharge, the maximum discharge limits of 75 kinds of water pollutants were classified and stipulated. This opinion draft contains more pollutant restrictions, and it is planned to increase 25 pollutant control indicators such as total vanadium, total cobalt, dichloromethane and cumene. At the same time, three pollutants, namely, easy-to-settle solids, organophosphorus pesticides and elemental phosphorus, are deleted, and the final total pollutant index will reach 97.

In addition, sewage units should set up independent sewage outlets, install automatic monitoring equipment for the discharge of major pollutants, and network with monitoring equipment of environmental protection departments.

People's Network-It is planned to increase 25 pollution control indicators.