1, the internal and external reflux is less than that of biological denitrification system and simple biological nitrification system.
2. Improper temperature control. When the temperature is lower than 15℃, the denitrification rate will obviously decrease, and when the temperature is 5℃, the denitrification will tend to stop.
3. Sludge load and sludge age Because biological nitrification is the premise of biological denitrification, only good nitrification can achieve efficient and stable denitrification. Therefore, the denitrification system must also adopt low load or ultra-low load and high sludge age.
Second, the total nitrogen exceeds the standard solution:
1, the high total nitrogen is due to the short denitrification time, that is, the short anoxia time, or the high DO control of anoxia, and the high ammonia nitrogen is due to the untimely denitrification or the short denitrification time after nitrification.
2. It can detect whether the carbon-nitrogen ratio is within the control range.
3. In the activated sludge process, whether the MLSS concentration meets the requirements and whether DO can meet the situation.
Extended data:
Nitrate nitrogen in wastewater exceeds the standard, and the main nitrate conversion process is inefficient. It is suggested that nitrogen removal equipment, such as Zhan Qing environmental protection and efficient nitrogen removal equipment HDN-FT, can effectively improve nitrogen removal efficiency, effectively remove nitrate nitrogen and solve the problem of high total nitrogen. Excessive discharge of nitrogen in water will lead to eutrophication of water body, make algae multiply and cause water bloom and red tide. When the total nitrogen content in water is more than 0.3mg/L, it will reach the eutrophication standard.
Baidu encyclopedia-total nitrogen