What is the specific meaning of bidding in the bidding project of sewage treatment plant?

Improve sewage discharge standards. Usually used in sewage treatment plant projects, the facility has been redesigned to improve the sewage treatment capacity and make the effluent meet the requirements of national and local standards.

The upgrading of sewage treatment plant is mainly to improve the sewage discharge standard and the discharge indexes of COD, ammonia nitrogen, total nitrogen and total phosphorus in sewage. To meet these requirements, it is necessary to redesign the sewage treatment facilities, make as few changes as possible, improve the sewage treatment capacity, and make the effluent meet the standard requirements.

Extended data:

Intake water quality

The influent quality of sewage treatment plant is mainly related to the following factors:

The nature and economic level of the city are described in the section on treatment scale. Due to the different geographical location and economic development of cities, the quality of sewage is also different. For example, coastal developed cities and southern cities use more water and have lower sewage concentration; Northern cities, especially the western region, use less water and have high relative concentration; In cities with a large industrial proportion, the concentration of industrial wastewater discharged into sewers is high, which leads to a high concentration of urban sewage.

1, industrial wastewater quality

In principle, industrial wastewater must be treated in the factory. Only after reaching the Water Quality Standard for Sewage Discharged into Urban Sewers can it be incorporated into the urban pipe network and finally enter the sewage treatment plant. However, due to the imperfect management system and means of point source pollution in China, industrial wastewater is discharged directly into urban sewers without treatment from time to time; Therefore, when determining the influent quality of sewage treatment plant, we must fully consider the influence of this factor and leave room.

2. Other pollution sources

In addition to the pollution sources of domestic sewage and industrial wastewater, there are often factors such as agricultural and animal husbandry pollution and the mixing of leachate from municipal solid waste sanitary landfill. Therefore, when determining the water quality of sewage treatment plants, we should comprehensively balance the above water quantity and water quality.

3. Drainage system

When the drainage system adopts full interception or partial interception combined system, attention should be paid to the influence of the change of sewage concentration caused by interception multiple and interception water quantity on the inflow judgment area.

Baidu Encyclopedia-Upgrading of Sewage Treatment Plant