How to solve the problem of wastewater plant influent being impacted?
Published Time:
2025-06-27
Source:
Author:
1. Dissolved Oxygen Adjustment Strategy
When influent is subjected to high-load shock, it can cause dissolved oxygen to abnormally decrease. In this case, various methods can be used to stabilize the system and prevent water quality fluctuations. One of them is To promptly increase the number of aerators and increase the air volume to quickly control the dissolved oxygen at a higher level, allowing the system to recover quickly.
Taking a municipal wastewater treatment plant as an example, sludge from the aeration tank of the plant and influent from a point with relatively poor water quality in the plant's pipeline network were collected and mixed in a 1:1 ratio in a 5L experimental tank. Three experimental groups were set up, and an aeration device was used to control the dissolved oxygen of the three experimental groups at 2mg/L, 4mg/L, and 6mg/L respectively, to study the impact of dissolved oxygen adjustment modes (2mg/L, 4mg/L, 6mg/L) on water quality recovery under high-load shock.
Experiments show that the higher the dissolved oxygen concentration, the more conducive it is to the removal of ammonia nitrogen. When the dissolved oxygen is controlled above 4mg/L, the ammonia nitrogen removal effect is better.
It is worth mentioning that, after analyzing the high-load influent shock situation of the wastewater treatment plant, after the biochemical pool system recovers, the system can enter a stable operation period after 1 day while maintaining the dissolved oxygen concentration screened in the first stage.
2. Return Ratio and Water Volume Adjustment Strategy
When the influent water quality is abnormal, the return flow can be increased to dilute the influent, reducing the impact of abnormal water quality on the system; at the same time, increasing the return flow can increase the system MLSS and improve the system's shock resistance. The effect of different return ratios on coping with high-load water quality shocks needs to be studied.
In case of high-load shock, the water storage capacity of the pipeline network can be used to reduce the influent volume, extend the system's retention time, and reduce the system load, which is conducive to the rapid recovery of the effluent water quality;
If it is nitrification inhibition leading to sludge poisoning, the water volume needs to be increased to allow the problematic water source to quickly pass through the system and quickly introduce the recovered influent into the system. The impact of different water volume adjustment control modes on the system recovery under different shock types needs to be studied.
Taking a municipal wastewater treatment plant as an example, in order to study the impact on system operation and system recovery time by increasing the return ratio and reducing the influent volume when the wastewater treatment plant is subjected to high-load influent shock, researchers set up four experimental groups.
Experimental group 1: The impact on the system when the return ratio is 100% and the influent volume is 1/2 of the daily water volume;
Experimental group 2: The impact on the system when the return ratio is 100% and the influent volume is 2/3 of the daily water volume;
Experimental group 3: The impact on the system when the return ratio is 150% and the influent volume is 1/2 of the daily water volume;
Experimental group 4: The impact on the system when the return ratio is 150% and the influent volume is 2/3 of the daily water volume.
It should be noted that the daily influent volume of the AB process of this wastewater treatment plant is 120,000 m3/d. All experimental groups use the actual influent of this wastewater treatment plant, with influent COD concentration of 769 mg/L and ammonia nitrogen concentration of 78.7 mg/L.
Experiments have shown that when the wastewater treatment plant is affected by high-load influent, reasonably increasing the return ratio and appropriately reducing the influent volume have a significant impact on the recovery of the system.
Specifically, during water quality shock, controlling the water volume to 2/3 of the daily influent volume and increasing the return ratio to 150% is easier to control, and the system recovery effect is more significant.
It is worth noting that many pipeline routes entering wastewater treatment plants are still old municipal pipelines, which are long and complex, and the direction of some pipelines is not very clear.
Recommended Dynamics
Address: 3rd Floor, Building C15, Phase II, Dongyi International Media Industrial Park, Chaoyang District, Beijing
Email:mkt@horwater.com
Email：
Tel：
Tel：
图片alt标题设置： Horwater Environment (Beijing) Co., Ltd.
表单验证提示文本： Content cannot be empty!
循环体没有内容时： Sorry,no matching items were found.
CSS / JS 文件放置地