Address: Zhucheng Development Zone Shun Road are 263
BAF Aeration biological filter
First, the device overview
BAF is the early 1990s, the rise of new wastewater treatment technology, has been in Europe and Japan and other developed countries widely popular. The process with the removal of SS, COD, BOD, nitrification, denitrification, phosphorus removal AOX (Hazardous Substances) role, which is characterized by collection of biological oxidation and retention of suspended solids in one, saving the subsequent sedimentation tank (secondary sedimentation tank) its volume load, hydraulic load, hydraulic retention time is short, less investment in infrastructure needed for good water quality: low energy consumption, save operating costs.
BAF is a third generation biofilm reactor, the biofilm not only has the advantage of technology, but also plays an effective spatial filtering effect, by using a special filter and correct valve design.
Second, the equipment Image
Third, the principle
Sewage through the filter layer, the water containing pollutants are trapped filter layer, and is attached to the filter material conversion biodegradable, while the state was dissolved organics and particulate matter have been removed, the resulting sludge remains in the filter layer rather just let the purified water through, so that can be achieved in a closed reactor without full biological treatment in the secondary settling tank is provided downstream of the sludge to settle.
The bottom of the filter with a water and mud tubes, in the upper part of the filler layer thickness is 2.5 ~ 3.5m, in order to prevent the loss of the filter, the filter bed containing filter head side to set concrete baffle plate from the filter head Remove the surface, without emptying the filter bed, easy maintenance. Bezel upper space is used as backwash water storage area, according to the height backwashing head may be.
The area has a return pump is used to filter the water pump to the water distribution corridor, and then returned to the bottom of the filter to achieve denitrification, no return system without the need for the denitrification process. Space at the bottom of the filler layer and the bottom of the filter backwash is reserved for expansion of the filler when reproducing.
Filter the air supply system is divided into two sets of piping, process air tube placed inside the filler layer for process aeration (oxygen aeration mainly provided by the aeration fan), and the filler layer is divided into two zones: the upper part aerobic zone, the lower part of the anoxic zone. Depending on the raw water quality, processing purposes and requirements of different heights packing layers, aerobic zone, anaerobic zone corresponding percentage change; air filter bottom line is the backwash air pipe.