Classification of Sewage Treatment Bacteria

Classification of Sewage Treatment Bacteria
Nitrification Bacteria: Nitrifying bacteria, aerobic in nature, are mainly present in aerobic tanks or contact oxidation tanks in sewage treatment processes. These tanks are equipped with aeration devices to provide sufficient oxygen for the bacteria to obtain electrons during nitrification, which converts ammonia nitrogen (NH3-N) into nitrite and nitrate. This process can form an initial cooperative relationship with denitrifying bacteria.
Denitrification Bacteria: Denitrifying bacteria primarily perform nitrogen removal in hypoxic water with dissolved oxygen below 0.5mg/L and pH between 6-9. The high total nitrogen in wastewater is linked to insufficient microorganisms in the anoxic tank, and also to carbon sources in the wastewater. During denitrification, the denitrifying bacteria utilize carbon source reductants to obtain electrons. Most denitrifying bacteria are heterotrophic, facultative anaerobic bacteria such as denitrifying bacilli, steinbachii bacilli, and fuliginous polar bacilli. They use oxygen from nitric acid to oxidize organic matter for energy under xenon gas conditions.
Complex Sewage Treatment Bacteria: Complex bacteria are mainly used to initiate new sewage systems, aiding in the rapid cultivation of microbial bacteria in sewage biochemical tanks. The complex bacteria consist of a complex bacterial system composed of 50 types of bacteria from six genera, adaptable to different water quality environments. The complex bacteria have broad application, including degradation of COD, BOD, ammonia nitrogen, total nitrogen, etc. The bacteria mainly include nitrifying bacteria, denitrifying bacteria, bacillus, pseudomonas, and other nutrients such as activated enzymes and polysaccharides. The complex bacteria are solid powdery, prepared by freeze drying the bacteria in a dormant state. The complex bacteria have strong adaptability, shock resistance, and good stability after the biochemical tank is well fermented. They also have certain removal capabilities for complex industrial chemical wastewater indicators exceeding standards, and can tolerate up to 2% salt after domestication.
COD Degradation Bacteria: COD degradation bacteria (COD-degrading bacteria) are mainly used to degrade COD indicators in sewage biochemical tanks. They primarily degrade COD in wastewater, improve water color, increase sludge floc particles, adjust sludge floc structure, and inhibit algal growth. When the organic concentration in the biochemical tank is too high or the tank is small, high-load sewage inflow can easily impact the microorganisms in the biochemical tank. For high-concentration COD indicators in pretreated wastewater, some COD degradation bacteria can be appropriately added during the bacterial culture process in the biochemical tank, effectively removing COD indicators, and also stabilizing the biochemical system better.