Improved type alternated technique for wastewater treatment of activated sludge process and equipment

Abstract

The present invention relates to a sewage treatment process by adopting improved alternative type active sludge method. Said sewage treatment process utilizes the equipments of treatment tank, anaerobic chamber, anoxybiontic chamber, aeration tank and flocculation precipitation tank, etc. and alternatively adopts the process steps of stirring, aeration, concentration, sludge reflus, mixing, flocculation, precipitation and biological dephosphorization, etc. so as to attain the goal of purifying sewage.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment by activated sludge method. Background technique [0002] Traditional alternating activated sludge reaction tank, such as figure 1 As shown, the inside is divided into three equal rectangular unit pools 10, and the adjacent unit pools are separated by common walls with holes at the bottom, so that the unit pools are connected to each other in water conservancy, and all of the three unit pools are equipped with aeration. Diffusion device. Among them, the two unit pools on the outside have dual functions, both as an aeration tank and as a sedimentation tank. The two pools are also equipped with fixed outlet weirs and excess sludge discharge outlets for water production and excess sludge discharge. The middle tank is always used as an aeration tank. The sewage entering the system can enter any one of the three rectangular pools in time sequence through the control of the intake gate. [0003...

AI Technical Summary

Problems solved by technology

[0006] ③The traditional alternating activated sludge method reaction tank adopts fixed weirs around the water outlet, and the backwash water of about 20 to 30 minutes per cycle needs to be discharged

There are two problems: one is that the discharge of backwash water is directly returned to the water inlet pump room, and the discharged water accounts for about 8% to 10% of the daily treatment volume, which increases the operating cost of the water inlet pump room

Second, because the sedimentation tank adopts a water outlet method similar to the radial flow sedimentation tank, the low surface load of the water outlet limits the effective water depth of the reaction tank, and the tank occupies a large area, which is not conducive to the compactness and intensiveness of the integrated reaction tank.

Images