1. technical name

Efficient land-saving biomembrane sewage purification technical equipment

2. scope of application

New construction or upgrading of urban sewage treatment plants, especially submersible sewage treatment plants.

3. technical content

3.1 technical principle

During normal operation, the fixed bed and fillers intercept a large amount of suspended solids, increasing biomass and reducing hydraulic retention time; when pollutants are intercepted to a certain extent, backwashing is carried out by increasing the aeration amount, and the sewage still continues to enter the reactor. Under the action of aeration and water flow, the fillers mix and collide, and the trapped suspended solids and aging biofilms fall off and are discharged with the water. Running and backwashing alternate.

3.2 main innovations

(1) The gas-water ratio is low (usually 2 - 3), and the aeration energy consumption is low; the fixed bed operation mode is adopted, and no filler is needed; the backwashing frequency is low and the backwashing time is short. (2) The filling ratio of the filler is high, the biomass in the reactor is large, the sludge concentration is high, the bubble cutting effect is good, the mass transfer efficiency is high, the microbial community is relatively independent, and the treatment efficiency is high. (3) Adopt biomembrane carriers matching the process, which have strong hydrophilicity, large specific surface area, high void ratio, solid structure and long service life. (4) There is no need to set up a secondary sedimentation tank, which saves the land area.

4. Pollution control or environmental restoration effects

After combined with advanced treatment technology, the effluent quality can stably meet the Class A standard of the "Discharge Standards for Pollutants in Urban Sewage Treatment Plants"(GB18918-2002), and the main indicators can reach the Class IV standard of GB3838-2002. The area occupied by the biochemical treatment unit can be saved by more than 30%.

5. Technology demonstration

This technology has been promoted and applied in more than 10 sewage treatment plants including Jinbai Sewage Treatment Plant in Guiyang City, and a series of process routes have been formed based on different pollutant treatment needs. This technical equipment is applied in the Beijing Tongzhou Bishui Reclaimed Water Plant Project. The effluent water can stably meet the GB18918 -2002 Class A discharge standard, and the main indicator can meet the GB3838 -2002 Class IV standard. The implementation of the project has a positive effect on alleviating river pollution in Tongzhou District. The design scale of the first phase of Jinbai Sewage Treatment Plant in Guiyang City is 3.0×104m3/d. The project was accepted in May 2018. The main effluent indicators (COD, BOD, ammonia nitrogen, total nitrogen, total phosphorus) stably reaches the GB18918 -2002 Class A standard or higher. The effluent is discharged into the Maijia River as river replenishment. The operating cost is 0.56 yuan/m3 of sewage. The project covers an area of more than 50% less than that of the improved AAO process, and the land-saving effect is obvious.

6. investment estimation

The total investment in the construction of the first phase of Jinbai Sewage Treatment Plant in Guiyang City is 233.3465 million yuan, of which the total investment in the project is 136.994 million yuan.

7. investment recovery period

The payback period for the first phase of the project of Jinbai Sewage Treatment Plant in Guiyang City is 12 years.

8. Prospects for transformation and promotion of technological achievements

This technical equipment is land-saving, high efficiency, and low energy consumption. It can be used for the construction or renovation of urban sewage treatment plants. It plays a positive role in promoting the technological progress of my country's sewage treatment industry, promoting the upgrading of the industrial structure to a green and low-carbon direction, and improving the reuse of water resources.