Sewage treatment method of reinforcing sedimentation in secondary sedimentation tank based on Fenton sludge backflow

Abstract

The invention relates to a sewage treatment method of reinforcing sedimentation in a secondary sedimentation tank based on Fenton sludge backflow. The sewage is introduced into the secondary sedimentation tank after being subjected to a biological reaction; the sewage discharged from the secondary sedimentation tank is introduced into a Fenton reaction tank to carry out a Fenton reaction; the secondary sedimentation tank is divided into two zones of a common sedimentation zone and a reinforced sedimentation zone which are not communicated with each other; both the sewage in the two zones are introduced to the Fenton reaction tank for reaction; the sludge produced after the Fenton reaction is sent back to the reinforced sedimentation zone; an activating agent and an cationic polyacrylamide solution are added in order during the back-sending process to carry out an activating treatment. The method takes full advantages of the characteristic that Fenton sludge can be easily settled, increases sedimentation efficiency of the secondary sedimentation tank and reduces the size of the secondary sedimentation tank, thereby saving capital expenditure. The method can greatly reduce treatment cost and is suitable for high concentration and difficultly processed industrial wastewater of papermaking, chemical industry, food, etc.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment method based on Fenton sludge reflux to strengthen sedimentation in a secondary settling tank. Background technique [0002] With the development of environmental protection in our country, the treatment requirements for both domestic sewage and industrial sewage are gradually increasing. The implementation of stricter sewage discharge standards reduces the damage to the environment caused by sewage on the one hand, and on the other hand, it also improves the resource utilization of sewage. conditions are created. [0003] Ordinary biological treatment is difficult to meet the gradually increasing sewage discharge standards, so adding advanced treatment after biological treatment is a common means of sewage treatment. Fenton method, as a commonly used sewage advanced treatment process, is widely used for its good and stable treatment effec...

AI Technical Summary

Problems solved by technology

The sedimentation efficiency of the secondary settling tank determines the size and form of the tank body. The low-efficiency secondary settling tank not only treats poor water quality and increases the infrastructure cost of the secondary settling tank, but also limits the concentration of microorganisms allowed to grow in the biological reaction tank, thus affecting The treatment effect of the sewage treatment system

The treatment and disposal of Fenton sludge causes waste of iron salt in the sludge on the one hand, and increases the sludge treatment cost on the other hand

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