Sewage treatment system and sewage treatment method

Abstract

The present invention discloses a sewage treatment system and a sewage treatment method. The sewage treatment system comprises a biological reaction pool comprising a selection zone, a filler zone and an active sludge zone, wherein the filler zone is positioned between the selection zone and the active sludge zone, the selection zone and the filler zone are separated by a separation wall, the upper portion of the separation wall is provided with a water passing-through hole, the water outlet end of the water passing-through hole is provided with a first sieve mesh, the filler zone and the active sludge zone are separated by a second sieve mesh, a first stirrer is arranged inside the selection zone, a second stirrer and a suspending filler are arranged inside the filler zone, a water discharging device is arranged inside the active sludge zone, an aeration system is arranged on the bottom portions of the filler zone and the active sludge zone, the active sludge zone is communicated to the selection zone through a sludge reflux pipeline, and the active sludge zone is connected to a remaining sludge discharging pipeline. The sewage treatment system and the sewage treatment method of the present invention are suitable for the new construction and the upgrading reforming of CAST(CASS), wherein the construction engineering does not exist during the reforming, and the reforming time is short; and the sewage treatment system and the sewage treatment method are especially suitable for the place having serious environmental protection situation and requiring non-water-supply-cut-off reforming.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment system and method. Background technique [0002] The CAST (or CASS) circulating activated sludge process has the advantages of high degree of automation and small footprint, but the CAST (CASS) process also has the problem of limited denitrification and phosphorus removal. Therefore, many researchers have focused on CAST (CASS) ) process has been improved. A kind of sewage bioreaction tank such as authorized announcement number CN203904149U, announcement number CN203904071U a kind of sewage biological reaction system, announcement number CN103991958B the method for upgrading and expanding the sequence batch type biological pool of moving bed biofilm technology. These improvements have solved the problem of limited denitrification and dephosphorization effects of the CAST (CASS) process, and have achieved good results. However, these impro...

AI Technical Summary

Problems solved by technology

However, the quality of raw water fluctuates, and when the influent concentration rises, it often cannot meet the standard stably

Moreover, in the existing CAST (CASS) process, the aeration method is microporous aeration. Because of the unique operation mode of the CAST (CASS) process, the process generally has the problem of excessively high dissolved oxygen in the aeration stage, resulting in sludge flocculation. question

In addition, the CAST (CASS) process also has the problems of high equipment idle rate and poor sludge settling performance

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