Domestic sewage treatment plant project case

Basic information about the project
Project name: Integrated equipment procurement project of sewage treatment station and supporting pipe network project in six towns of Huilai County
Project address: Huilai County six towns proposed sewage treatment station
Delivery time: After the contract is signed, the main equipment will arrive within 20 days, and the equipment supply, entry, installation and commissioning will be completed within 30 days.
Project scale: Equipment procurement of sewage treatment station in six townships of Huilai County includes six townships, of which:
The total construction scale of Donggang sewage treatment station is 250t/d
Qishi Town sewage treatment station construction scale 300t/d
Xianan Town sewage treatment station construction scale 900t/d
Zhoutian Town sewage treatment station construction scale 750t/d
Qianzhan Town sewage treatment plant construction scale 900t/d
Aojiang Town total construction scale 500t/d.

Process characteristics
The A2/0 process is to add an anoxic pool to the anoxic pool, and return part of the mixture liquid flowing out of the aerobic pool to the front of the anoxic pool to achieve the purpose of nitrification and nitrogen removal. The synchronous phosphorus and nitrogen removal mechanism of A2/0 method consists of two parts: First, phosphorus removal, phosphorus in the sewage in the anaerobic state (DO<0.3mg/L), the release of phosphorus accumulation bacteria, and in the aerobic condition more absorption, in the form of residual sludge discharge system. The second is nitrogen removal. DO<0.5mg/L should be controlled in the anoxic section. Due to the role of aerobic denitrification bacteria, BOD in water is used as a hydrogen supplier (organic carbon source) to reduce nitrate and nitrite from the aerobic pool mixture into nitrogen and escape into the atmosphere to achieve the purpose of nitrogen removal.
Biological aerated filter (BAF) technology is developed on the basis of fully absorbing the advantages of foreign biological aerated filter, its biggest feature is the use of a new type of spherical ceramic filler, on its surface and open inner cavity space to grow microbial membrane, sewage from the bottom up through the filter layer, The microbial membrane absorbs organic pollutants in the sewage as nutrients for its own metabolism, and provides aeration for oxygen in the lower part of the filter material layer, and the gas and water are in the same upward flow state, so that the organic matter in the wastewater can be aerobic degradation and denitrification can be carried out. It regularly uses the treated water to backwash the filter to eliminate the aging microbial film proliferated on the surface of the filter material to ensure the activity of the microbial film.

• The process can be called the simplest synchronous nitrogen and phosphorus removal process in the system, and the total hydraulic residence time is less than other processes.
• In the anaerobic, anoxic, aerobic alternating operation conditions, filamentous bacteria can not prolifitate, not easy to occur filamentous expansion of sludge, SVI value is generally less than 100.
• The sludge contains high phosphorus and has high fertilizer efficiency.
• The floor area is small, usually 1/5-1/10 of the floor area of the conventional treatment process, the factory layout is compact and beautiful.
• The treatment of effluent quality is good, can meet the water quality standards or domestic water quality standards.
• The process is short, the oxygen transmission efficiency is high, the oxygen supply power consumption is low, and the power consumption of the treatment unit sewage is low.
• The filtration speed is high, the processing load is much higher than the conventional processing process.
• Strong impact resistance, small impact by climate, water and water quality changes, especially suitable for cold weather areas, and can be run intermittently.
• Can be built closed workshop, reduce odor, noise on the surrounding environment, visual sensory effect is good.
• Convenient operation and management, easy maintenance.
• All modular structure, convenient for later reconstruction and expansion.