The working principle of anaerobic biological filter

1. Filtration

The filler intercepts large particles and suspended solids filtered into the water

2. Hydrolysis

Anaerobic microorganisms can hydrolyze large-molecule insoluble substances into small-molecule soluble substances

3. Absorption

Anaerobic microorganisms adsorb and absorb organic pollutants in water, part of which is used for their own growth and reproduction, and part of it is sealed by U-shaped water in the form of biogas

4. Denitrification

The denitrifying bacteria that return the effluent from the contact oxidation bed to the anaerobic microorganisms in the anaerobic filter can use the nitrate nitrogen in the return water and convert it into nitrogen to remove nitrogen in the sewage. After the rural sewage is treated by the anaerobic filter, the concentration of suspended solids, organic pollutants and nitrogen is reduced, and the subsequent load of contacting the oxidation bed is also reduced.