Sewage biological treatment is a treatment method for purifying sewage by utilizing the metabolism of microorganisms that are widely distributed in the natural world, diverse types of metabolic nutrients, and strong adaptability. Â The biological treatment method of sewage is an artificial strengthening technology based on the self-purification of the environment. Its significance is to create a good environment conducive to the growth and reproduction of microorganisms, enhance the metabolic function of microorganisms, promote the proliferation of microorganisms, accelerate the inorganicization of organic matter, and enhance sewage. Purification process.
According to the different needs of dissolved oxygen in microorganisms involved in metabolic activities, sewage biological treatment technology is divided into aerobic biological treatment, anoxic biological treatment and anaerobic biological treatment. Aerobic biological treatment is a biological treatment process in the presence of dissolved oxygen in water (ie, the presence of molecular oxygen in water); anoxic biological treatment is the absence of molecular oxygen in water, but in the presence of chemical oxygen such as nitrate Biological treatment process carried out; anaerobic biological treatment is a biological treatment process carried out in the presence of neither molecular oxygen nor combined oxygen in water. Aerobic biological treatment is the main method used in urban sewage treatment. The treatment of high-concentration organic sewage often uses anaerobic biological treatment. In recent years, with the increase of nitrogen, phosphorus and other nutrient removal requirements, anoxic biological treatment and anaerobic biological treatment are also widely used in urban sewage treatment. The biological treatment of anoxic and aerobic combination is mainly used for biological nitrogen removal. The biological treatment of oxygen and aerobic combination is mainly used for biological phosphorus removal.
According to the different ways of microbial growth, biological treatment technology is divided into two types: suspension growth method and attachment growth method. The suspension growth method refers to maintaining the suspended state of the microorganism in the biological treatment structure by an appropriate mixing method, and fully contacting the organic matter in the sewage to complete the degradation of the organic matter; unlike the suspension growth method, the microorganism in the attachment growth method is attached. It grows on a certain kind of carrier and forms a biofilm. When the sewage flows through the biofilm, the microorganisms contact with the organic matter in the sewage to complete the purification of the sewage. A typical representative of the suspension growth method is the activated sludge method, and the attachment growth method mainly refers to the biofilm method. At present, the biological treatment technologies of various sewages are carried out around these two methods.
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