The function of the pre-denitrification tank is to receive the sewage from the regulating tank and the return sludge from the sedimentation tank, fully remove nitrate and oxygen under anoxic conditions, and strengthen the anaerobic phosphorus release by phosphorus-accumulating bacteria.
The function of the anaerobic tank is to improve the phosphorus release efficiency of phosphorus-accumulating bacteria in a strict anaerobic environment, and to cooperate with the aerobic tank to remove phosphorus. The main function of the anoxic tank is to use denitrifying bacteria to perform denitrification and denitrification at low dissolved oxygen concentrations. At the same time, denitrification provides partial alkalinity, which provides favorable conditions for subsequent nitrification in the aerobic tank.
In the aerobic tank, microorganisms decompose organic matter under aerobic conditions, and the nitrifying bacteria attached to the fluidized filler perform an efficient nitrification reaction, gradually converting organic nitrogen and ammonia nitrogen in the sewage into nitrous acid. salt and nitrate, while phosphorus-accumulating bacteria overabsorb phosphorus, forming a high concentration of phosphorus-containing sludge; after separation of mud and water in the sedimentation tank, the supernatant is biochemically filtered through the soft fixed fill filter area to further remove nitrogen in the water Phosphorus and other pollutants.
So, denitrification converts harmful pollutants into harmless gases that can be safely discharged into the environment. This is the process of removing nitrogen from wastewater. Excessive nitrogen (and carbon) concentrations can lead to serious environmental problems such as ecological imbalance, an increase in toxic algae overgrowth in waterways, depleting oxygen levels to eliminate marine life, and producing unpleasant odors odor problems and contamination of drinking water supplies. Too much nitrogen in drinking water can pose health risks to people and animals, especially infants, pregnant women and at-risk adults.