introduction:
With the acceleration of urbanization and the continuous increase of population, sewage treatment has become an issue that cannot be ignored in today's society. Excessive total nitrogen is a common challenge in the process of sewage treatment plants. This article will introduce a solution to address excessive total nitrogen, namely the AAO treatment process in sewage treatment plants.
1、 Overview of AAO treatment process in sewage treatment plant
AAO (Anaerobic Anoxic Oxic) is a process that combines anaerobic, anaerobic, and aerobic processes to effectively remove organic matter and nitrogen sources from wastewater, making it particularly suitable for treating situations where total nitrogen exceeds the standard.
2、 The advantages of AAO treatment process for total nitrogen exceeding the standard
1. Significant removal effect of organic matter in wastewater: The AAO treatment process utilizes anaerobic bacteria to decompose organic matter into organic acids during the anaerobic stage, providing a degradation substrate for organic matter in wastewater. During the anoxic stage, aerobic bacteria utilize the organic acids produced during the anaerobic stage to further degrade organic matter in wastewater. This continuous aerobic anoxic treatment process can greatly improve the removal efficiency of organic matter and reduce the total nitrogen content.
2. Optimize nitrogen source removal in wastewater: In the AAO treatment process, aerobic bacteria oxidize organic matter while converting ammonia nitrogen in wastewater into nitrate nitrogen through nitrification, and then reduce nitrate nitrogen to nitrogen through denitrification in the anaerobic stage, thereby achieving the removal of nitrogen sources in wastewater. This ammonia nitrogen nitrification denitrification process can significantly reduce the total nitrogen content.
3. Simple equipment and stable operation: Compared to traditional aerobic anoxic processes, the AAO treatment process has a simpler equipment structure and lower operating costs. Meanwhile, the AAO process has stable operating characteristics and is not easily affected by the quality of incoming water.
3、 Improving the AAO process to address total nitrogen exceeding the standard
Although the AAO process has a good total nitrogen removal effect, it still encounters situations where the total nitrogen exceeds the standard in practical applications. Here are several methods to improve the AAO process to address total nitrogen exceedance:
1. Increase the residence time in the anoxic and aerobic stages: Appropriately extending the residence time in the anoxic and aerobic stages can increase the degradation ability of aerobic and anaerobic bacteria and improve the removal efficiency of total nitrogen.
2. Use external carbon sources: Adding external carbon sources during the anoxic stage can provide more organic carbon, increase the growth of aerobic bacteria, and thereby enhance the removal of organic matter from wastewater, reducing total nitrogen content.
3. Improve denitrification process: Appropriately increasing the carbon nitrogen ratio in the denitrification stage can help better complete denitrification and achieve nitrogen source removal from wastewater.
Conclusion:
Excessive total nitrogen is a common problem in sewage treatment plants, and the AAO treatment process is an effective solution to address this issue. It has efficient removal ability for organic matter and nitrogen sources in wastewater, stable operation, and simple equipment. By improving the targeted AAO process, the removal efficiency of total nitrogen can be further enhanced, ensuring that the wastewater treatment process meets environmental requirements and contributes to urban environmental protection and sustainable development.
