The sewage treatment discharge standard refers to the setting of certain restrictions and requirements on the physical, chemical, and biological performance parameters of "wastewater" under the norms of national and local environmental protection regulations. In China, the discharge standards for sewage treatment are uniformly defined by normative documents such as the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002) and the "Comprehensive Wastewater Discharge Standards" (GB 8978-1996) issued by the State Council. At the same time, different industries also have corresponding pollutant discharge standards, such as industrial wastewater discharge standards (GB 8978-1996) and hospital wastewater discharge standards (GB18466-2005).

Wastewater treatment is an important measure to protect the environment, but only by meeting certain standards can it be legally discharged. Below, Ying Yuan will introduce the standards that sewage treatment must meet in order to discharge:

Water quality objectives: pollutant concentration, total phosphorus, total nitrogen, etc.

Emission method: direct emission or reuse.

Discharge of water bodies: surface water, groundwater, or oceans.

Emission conditions: location, depth, speed, etc. of the discharge outlet.

The water quality after sewage treatment should comply with the provisions of national and local regulations. For different industries and emissions, there are specific emission standards and pollutant emission standards on the regulatory website, which must be selected purposefully. Generally, for industrial wastewater, the biochemical removal of pollutants requires more than 90%, chemical removal requires more than 80%, and suspended solids removal requires more than 70%. If it does not meet the standards, it cannot be directly discharged.

After the water body meets the standards, it must be continuously monitored. Before discharge, it is necessary to monitor the effluent from the sewage treatment station, and after discharge, it is also necessary to monitor at the discharge outlet to ensure that the wastewater does not have adverse effects on the environment.

If there are still organic matter and nutrient elements, such as nitrogen, phosphorus, etc., after treatment, subsequent treatment is needed to prevent pollution to the environment after discharge. The commonly used method is to send the treated sludge into the biogas digester for subsequent treatment such as biogas fermentation and dry slagging.

In addition to meeting national and local discharge standards, sewage treatment also requires monitoring before discharge and continuous monitoring after discharge to ensure that the environment is not polluted. If the wastewater cannot meet the discharge standards or the environmental bottom line regulations after discharge, it cannot be discharged directly. Wastewater treatment is a long-term task that must be continuously improved and improved to achieve the best results.

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