There is no molecular oxygen and combined oxygen in the anaerobic tank. The electron acceptor of the degradation of organic matter is organic matter (an intermediate product of anaerobic acidification or fermentation), and the electron acceptor in the anoxic pool is NO3- or NO2-. That is, the presence of combined oxygen is allowed in the anoxic tank. If molecular oxygen is introduced into the anaerobic or anoxic pool, the metabolic activity of the anaerobic or denitrifying bacteria is inhibited, and the electrons removed by the organic matter are directly delivered to the molecular oxygen.
In wastewater, if DO<0.2mg/l is anaerobic and 0.2<DO<0.5 is hypoxia, anaerobic is a biochemical treatment process involving anaerobic bacteria. Anaerobic bacteria do not need oxygen. It can be said that oxygen is poisonous to them. The substance, therefore, requires that the dissolved oxygen in the system be equal to zero, which is the biggest feature. In addition, the anaerobic reaction requires a higher and more stable temperature, wherein the intermediate temperature reaction is between 31 and 33 degrees Celsius. Anaerobic reactions require a strict pH. The hypoxic reaction is a biochemical reaction involving facultative bacteria. The facultative bacteria can react under aerobic conditions or anaerobic conditions. The dissolved oxygen of the system is required to be below 0.5 mg/L, and the temperature and pH requirements are not The anaerobic reaction is strict. Anaerobic is also related to nitrate nitrogen.
There is no dissolved oxygen in the anoxic environment, but there is nitrate nitrogen. There is no nitrate in the anaerobic environment, so in the actual sewage treatment process of anaerobic, aerobic, anoxic, anaerobic is achieved under closed conditions, aerobic is achieved by aeration, and hypoxia It is realized by returning the sludge of the sedimentation tank after the aeration tank, that is, the wastewater containing nitrate nitrogen in the aerobic tank is refluxed to the anoxic tank at the front end for denitrification to achieve the purpose of denitrification. It is anaerobic/aerobic for dephosphorization and no internal reflux, in order to make the reactor at the front end an anaerobic tank with neither dissolved oxygen nor nitrate nitrogen.
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