Causes of Excessive Ammonia Nitrogen
1. Insufficient process design scale, too low treatment load
2. Insufficient nitrifying bacteria or limited activity, or insufficient air supply
3. Although the retention time is sufficient, the aeration rate does not meet process requirements, resulting in low dissolved oxygen levels
4. Insufficient precision in hydraulic retention time control, deviating from the optimal reaction time
5. The nutrient ratio does not meet design requirements, requiring external nutrient dosing devices.
Methods for Reducing Ammonia Nitrogen in Wastewater
1. Physical Treatment Method: Adding flocculants to wastewater removes ammonia nitrogen. Its effectiveness is closely related to the pollutant concentration. It has a slight effect on high-concentration wastewater exceeding 1000 mg/L. When the concentration drops to several hundred mg/L, flocculation and sedimentation are unlikely to achieve ideal treatment results.
2. Biological Treatment Method: Widely used in wastewater treatment plants or large-scale wastewater treatment stations. The core principle utilizes the metabolic activity of microorganisms to convert ammonia nitrogen into harmless substances. The initial investment is relatively high, including equipment such as aeration systems and bioreactors. Afterwards, continuous monitoring of parameters such as water temperature, pH, and dissolved oxygen by technical personnel is required, demanding a high level of expertise in daily maintenance. It is suitable for scenarios with stable treatment scale and strong operation and maintenance capabilities.
3. Chemical Treatment Method: This method involves adding ammonia nitrogen removal agents, utilizing their oxidative decomposition to rapidly degrade ammonia nitrogen pollutants. This method has high reaction efficiency, a short treatment cycle, and is simple to operate-usually, the agent can be added directly at the wastewater discharge point without complex equipment debugging or process adjustments. Its applicability covers the deep treatment of high-concentration ammonia nitrogen wastewater and the direct purification of medium- and low-concentration ammonia nitrogen, balancing economic efficiency and practicality.
Comprehensive Recommendation: Chemical methods using ammonia nitrogen removal agents, with their advantages of high efficiency, convenience, and controllable cost, have become the preferred solution for reducing ammonia nitrogen in wastewater treatment. Whether for end-of-pipe treatment of high-concentration wastewater or direct purification of medium- and low-concentration wastewater, they can function stably, making them particularly suitable for scenarios with high requirements for treatment efficiency and ease of operation.
