What is the reason for the low COD removal rate in the aerobic pool for sewage treatment?

　　What is the reason for the low COD removal rate in the aerobic pool for sewage treatment?

　　If the COD (chemical oxygen demand) removal rate in the aerobic pool is low, there may be several reasons:

　　1. High influent COD concentration: If the influent COD concentration exceeds the treatment capacity of the aerobic pool, the aerobic bacteria cannot effectively degrade organic matter, resulting in a low COD removal rate.

　　2. Insufficient aeration: The aeration system in the aerobic pool provides dissolved oxygen for aerobic bacteria to degrade organic matter. If the aeration volume is insufficient, the growth and metabolic activity of aerobic bacteria will be restricted, and the degradation efficiency will decrease.

　　3. Too low temperature: Aerobic bacteria are sensitive to temperature, and low temperature will inhibit their activity and growth rate. If the temperature of the aerobic pool is too low, the activity of aerobic bacteria will decrease, resulting in a decrease in COD removal rate.

　　4. Uneven mixing: The degree of mixing inside the aerobic pool directly affects the contact opportunity between organic matter and aerobic bacteria in the wastewater. If the mixing of the aerobic pool is uneven, the contact between organic matter and aerobic bacteria will be reduced, and the degradation efficiency will also be affected.

　　5. Insufficient nutrients: Aerobic bacteria need certain nutrients, such as nitrogen and phosphorus, to degrade organic matter. If the aerobic pool lacks the necessary nutrients, the growth and metabolism of aerobic bacteria will be restricted, and the COD removal rate will be reduced.

　　In response to these problems, appropriate measures can be taken to improve the COD removal rate of the aerobic pool, such as adjusting the influent water quality, increasing the aeration volume, improving the mixing method, providing a suitable temperature and supplementing the necessary nutrients. At the same time, regular monitoring and maintenance of the operating status of the aerobic pool is also an important means to ensure the COD removal effect.