Activated sludge process sludge reduction and floc structure regulation method

Abstract

An activated sludge process sludge reduction and floc structure regulation method is disclosed; raw sewage first enters an activated sludge biological system, a sludge water mixture enters a sedimentation tank for solid-liquid separation, treated sewage flows out from the upper part of the sedimentation tank, a part of sludge precipitating to the lower part is discharged through a residual sludgepump out of the system, the other part of the sludge is transported to a floc structure control unit through a sludge return pump, and the floc structure control unit is provided with a shearing and grinding system that can adjust mechanical strength and a velocity gradient. External loose extracellular polymers of an activated sludge floc are broken and separated from zoogloeas by the shearing and grinding action of the floc structure control unit, and the loose extracellular polymers which are separated from the floc enter the biological system and are decomposed and metabolized by activatedsludge. On the one hand, sludge reduction is realized by decomposing of the loose extracellular polymers, and on the other hand, the sludge floc structure becomes dense, and is beneficial to sludge sedimentation and mud water separation in the later stage.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for sludge reduction and floc structure regulation in an activated sludge process. Background technique [0002] With the expansion of the scale and number of sewage treatment plants in our country, the problem of sewage treatment has been effectively solved, but it is accompanied by another problem: the disposal of excess sludge. At present, the total annual output of municipal sludge in my country has exceeded 40 million tons, and it is increasing at a rate of about 10% every year. Investigations and studies have shown that the cost of excess sludge treatment and disposal accounts for 25% to 40% of the total operating costs of sewage treatment plants, and has become an important burden on the operating costs of sewage treatment plants. However, the treatment level of excess sludge in my country is much behind the level of sewage treatment technology. The numb...

AI Technical Summary

Problems solved by technology

Although prolonging the sludge age of the activated sludge system can effectively reduce the remaining sludge production, there are several problems in the application process of this technology. The effect is poor, and problems such as sludge corrosion and sludge floating are prone to occur. Secondly, although some bacteria can age and die by prolonging the sludge age, they will be catabolized by other bacteria, but the phosphate stored in the cells will be released into the system again. Increasing the operating load of the system and prolonging the sludge age will inevitably reduce the discharge of excess sludge, so it will inevitably affect the phosphorus removal effect of the system

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