Emergency regulation method for treating water quality impact of abnormal inlet water by using CASS (cyclic activated sludge system) process

Abstract

The invention provides an emergency regulation method for treating water quality impact of abnormal inlet water by using a CASS (cyclic activated sludge system) process. The emergency regulation method comprises the following steps: determining whether a CASS reaction tank is about to be impacted by the abnormal inlet water according to on-line detection of a total water inlet installed on a CASS process sewage treatment plant; if detecting that the abnormal inlet water enters the CASS reaction tank in a certain time interval, adjusting the CASS reaction tank in or about to enter the water inlet stage to realize the lowest water filling ratio (f) and the highest sludge return ratio (R) according to the water inlet flow so as to create the maximum buffering capacity; controlling time allocation and corresponding dissolved oxygen concentration levels of four stages of water inlet, aeration, sediment and water decantation of the CASS reaction tank in or about to enter the water inlet stage in an operation cycle according to the water quality characteristics of the abnormal inlet water; and if the circumstances are normal, operating according to a normal mode. By utilizing the emergency regulation method, a CASS process operation method is regulated, equipment does not need to be changed, and the emergency regulation method has the characteristic of practicability.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an emergency control method for a CASS process to cope with the impact of abnormal influent water quality. [0002] Background technique [0003] The CASS (Cyclic Activated Sludge System) process is a form of circulating activated sludge technology, and it is a charge-release intermittent activated sludge treatment process that operates in a sequential batch aeration-non-aeration mode. The basic structure of CASS is: based on the sequencing batch activated sludge method (SBR), the reaction tank is designed into two parts along the length of the tank, the front part is the biological selection zone, also known as the pre-reaction zone, and the rear part is the main reaction zone. , a liftable automatic water skimming device is installed at the rear of the main reaction zone. The processes of aeration, sedimentation and drainage of the whole process are cycled in the sam...

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problem that the existing CASS process cannot deal with the impact of high-organic sewage or / and high-nitrogen sewage in an emergency, resulting in abnormal water inflow, which makes the sewage treatment unable to discharge stably and meet the standards, and provides An emergency control method for CASS technology to deal with the impact of abnormal influent water quality

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