The self-cleaning filter is specifically used. After the sewage is intercepted by the grid, it can directly enter the first layer of aerobic filtration layer. The pores of the first layer of aerobic filtration layer are large, and are generally padded with coarse sand and gravel. It mainly removes large suspended solids from the sewage and mixes the oxygen in the air into the sewage through the turbulent flow of the water in the sand.
Then the sewage enters the second layer of aerobic filter layer. The particle size of this layer of sand is relatively small, and the residence time of the sewage in this layer is relatively long, mainly due to the oxidation process of organic matter by aerobic microorganisms. In the oxygen filter layer, biofilms are easily formed, similar to the treatment of biofilms. If the organic matter content of the sewage is not very high, the treated water has basically reached the discharge standard, and the treated water can also be collected for use as a medium water.
If the organic content of the sewage is high, the sewage can continue to be subjected to aerobic filtration of the next layer, the pores of the filtration layer will be smaller, the treatment time is longer, and the effect is better. In this layer, due to the longer residence time of the sewage, the N and P in the sewage also have a better removal effect.
The discharge water treated by the self-cleaning filter can already meet the discharge requirements, and it is not necessary to provide a secondary sedimentation tank for sludge separation. This treatment process is suitable for construction beside the river and lake, and it can be discharged near the treatment water, and it can be used without water pipes or pipes.www.inocofiltration.com