DAV-HBAF
DAV-HBAF
1. Process Introduction
Biological aerated filter has the characteristics of high load, impact resistance, small floor area, less capital investment, high effluent quality, no secondary sedimentation tank, highly automated and no sludge bulking. The traditional biological aerated filter mostly utilizes the filter plate and filter head, which has the problems of complex installation, easy blockage of the filter head and loss of filter media.
Davco biological aerated filter is an upward flow biological aerated filter technology combining filtration and aerobic biological treatment. It improves the water and gas distribution system of the traditional biological aerated filter and adopts the newly developed Dav-Block technology. There is no manhole at the bottom of the filter. Compared with the traditional biological aerated filter, it has the advantages of more uniform gas and water distribution, no blockage and maintenance free. The efficient removal of BOD, SS and NH3-N can be realized in one treatment unit. The filler can be customized according to the actual inflow. The filter media of sand, ceramsite, volcanic rock and combined filler can be selected. Davco strictly selects the filler to create a good growth environment for biofilm growing.
2. Core Technology
1. Air Power
Biological aerated filter is a form of biofilm reactor. Compared with traditional activated sludge process, it has the characteristics of higher biomass, shorter hydraulic retention time and faster biochemical reaction speed. In order to prolong the operation cycle of the filter, improve the reaction efficiency and avoid the formation of short flow, Davco has developed Air Power technique. During the operation cycle of the filter, air power is turned on through multi-parameter judgment to improve the operation efficiency and effluent quality of the filter.
2. Sump Flush
The inlet water at the bottom of the biological aerated filter will carry some impurities, which will gather at the bottom after long-term operation, affecting the normal operation of the filter. Davco pump flush technology can clean the bottom inlet channel and take away impurities.
3. Automatic Backwashing System
The filter requires backwashing after running for a period of time. Good backwashing is necessary to ensure the efficient operation of the filter. Davco knows the importance of filter backwashing and provides an intelligent backwashing control system to accurately judge whether the filter needs to start backwashing and prolong the operation cycle of the filter to the greatest extent. At the same time, Davco unique clean water tank water distribution system will also minimize the impact of backwashing on downstream treatment units, and the backwashing water volume is usually controlled below 3%.
Application:
It can be used for secondary biological treatment and advanced treatment to solve the problem of effluent COD, BOD and NH3-N exceeding the standard. In the advanced treatment stage, BOD effluent is usually less than 5 mg/L, NH3-N effluent is usually less than 0.5 mg/L, and SS can be intercepted at the same time.
