Real-time controlling method for denitrification by reinforced circulating type active sludge process

Abstract

The invention discloses a real-time control method for denitrification by an enhanced circulating activated sludge method, which belongs to the field of biological denitrification of sewage and is suitable for advanced treatment of urban sewage. The effect of circulating activated sludge method on nitrogen and phosphorus removal is not ideal. The steps of the present invention: open the agitator in the main reaction zone at the same time as entering the water, and carry out the denitrification process under the anoxic condition, and stop stirring when a maximum value appears on the pH value curve and an inflection point appears on the ORP curve; Oxygen is supplied to the mixed solution to degrade organic matter and nitrify nitrogenous compounds, and stop aeration when a minimum value appears on the pH curve; repeat the above steps until the end of the water inflow stage, and react with the aerobic aeration stage end of period. The following process is similar to the traditional CAST method. It enters the sedimentation, drainage, and idle stages in turn, repeating all steps in turn and discharging sludge regularly. The whole process is completed by a real-time control system, which is easy to operate, low in cost, strong in impact load resistance, and not prone to sludge bulking.

Description

technical field [0001] The invention relates to a real-time control method for strengthening the denitrification performance of a circulating activated sludge method, belongs to the technical field of biological denitrification of sewage by the SBR method and its modified process, and is suitable for advanced treatment of urban sewage. Background technique [0002] Biological denitrification technology of sewage is an important research direction in the field of water pollution control, and has attracted widespread attention from all over the world. Due to the incomplete nitrification in the conventional activated sludge process, denitrification hardly occurs, and the removal rate of total nitrogen is only between 10% and 30%. Therefore, for urban sewage, if the conventional activated sludge method is used for treatment, the effluent also contains a large amount of nitrogen and phosphorus. With the increasingly prominent phenomenon of "eutrophication" in surface water, peopl...

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Problems solved by technology

However, the quality of raw water fluctuates and is not fixed. Obviously, this fixed operation mode is not an optimized way.

For example, when the concentration of pollutants in the influent water is higher than the average concentration, if the water inflow time of 2 hours remains unchanged and the aeration rate remains unchanged, then the aeration reaction time of 2 hours is insufficient; When the concentration of pollutants in the water is reduced, the aeration reaction time of 2 hours is too much and wasted

Moreover, although the aeration reaction time of 2 hours may meet the needs of nitrification reaction, the removal efficiency of total nitrogen will be affected due to insufficient anoxic denitrification time

In addition, constant aerobic aeration time is also not conducive to short-range nitrification

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