my country's sewage treatment started late but developed rapidly. The process used in sewage treatment is mainly biochemical treatment. Common processes include contact oxidation, AB method, A/O method, oxidation ditch, SBR, and aeration. Biological filter, diversion aerated biological filter, etc.
The diversion aeration biological filter is a new sewage treatment process with independent intellectual property rights in my country. According to the different subsequent treatment processes, it is divided into: hydrolysis-diversion aeration biological filter, anaerobic- Diversion aeration biological filter, air flotation-diversion aeration biological filter, rapid sedimentation-diversion aeration biological filter, ultrasonic-diversion aeration biological filter, microwave-diversion aeration biological filter , ozone-diversion aeration biological filter, etc.
The diversion aerated biological filter combines with other processes in the upgrading and transformation of old sewage treatment projects, nitrogen and phosphorus removal, and reclaimed water reuse to develop the AB method - diversion aerated biological filter; A/O method - diversion aeration biological filter; A2/O method - diversion aeration biological filter; oxidation ditch - diversion aeration biological filter; SBR - diversion aeration biological filter; biological contact oxidation -Diversion aeration biological filter and other advanced treatment processes.
The diversion aerated biological filter fully draws on the aerated biological filter method, contact oxidation method, biofilm method, interstitial aeration method, artificial rapid filtration method, sedimentation separation method, nitrification and denitrification method , water supply rapid filtration method and other eight design techniques, and new sewage treatment processes and technologies developed by combining secondary or tertiary sewage treatment processes. Obtained national patent in 2005.
There are engineering examples of diversion aerated biological filters in Beijing, Shandong, Hebei, Guizhou, Shanxi, Sichuan, Inner Mongolia, Heilongjiang, Jiangsu, Jilin, Henan, Hubei, Tianjin, Xinjiang and other places in my country. , the cases involve sewage treatment in the fields of life, hospitals, chemical industry, slaughter, food, flax, alcohol, pharmaceuticals, mustard and other fields. A large number of applications have proved that: the effluent water quality CODcr is generally below 20mg/L, with a minimum of 5.95mg/L; BOD5 is generally below 10mg/L, with a minimum of 3.50mg/L; SS is generally below 20mg/L, with a minimum of 6.55mg/L.
The diversion aerated biological filter allows sewage to be aerated twice, sedimented twice, and filtered twice in the same treatment tank, solving other sewage treatment processes that require four tanks to complete. Especially under the condition of continuous water inflow, intermittent aeration and activated sludge return are achieved, and the entire operation is not idle. Its advantages are more prominent than other treatment methods, and the treatment effect is particularly significant. It was listed as an "innovation project" in 2009; in December of the same year, it was listed as an "environmental protection technology encouraged by the state"; in 2010, it was listed as a "national key new product"; in 2012, it was listed as a "national key new product" during the 12th Five-Year Plan period. The state has increased investment in recommending and encouraging the development of environmental protection technologies in urban, rural, industrial, aquaculture, urban sewage treatment plant upgrading, nitrogen and phosphorus removal, and reclaimed water reuse.