Advanced wastewater treatment technology for sewage treatment and upgrading and reconstruction

Abstract

The invention discloses an advanced wastewater treatment technology for sewage treatment and upgrading and reconstruction. The advanced wastewater treatment technology is a combined technology of an efficient settling basin and a riser fiber filter cloth filter tank added between a secondary sedimentation tank and a disinfecting tank of the original process of a sewage treatment plant; an efficient sedimentation tank is composed of two modules of a quick mixing region and an efficient sedimentation region; a FeCl3 chemical is fed to the quick mixing region so as to be agitated to react with sewage; the adding amount of the FeCl3 chemical is 5-8mg / L; the standing time of the quick mixing region is 1.5-2 minutes; the standing time of the efficient sedimentation region is 15-20 minutes; the standing time of the riser fiber filter cloth filter tank is 8-12 minutes; effluent of the secondary sedimentation tank is firstly processed by the efficient sedimentation tank, and then processed by the riser fiber filter cloth filter tank, finally achieves the first level A of discharge standard for sewage treatment after passing through the disinfecting tank. By adopting the advanced wastewater treatment technology, the problems that the efficient sedimentation tank process is independently used, so that effluent SS is unstable, and the filter cloth filter tank is independently used and thus phosphorus cannot be removed are effectively solved, a flocculating agent does not need to be excessively fed again, the dosing cost is greatly reduced, and fouling on an online monitoring instrument probe caused by feeding polyacrylamide (PAM) is avoided.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a treatment section process for level A effluent index sewage of a municipal sewage treatment project, and in particular to a sewage advanced treatment process for sewage treatment standard upgrading and reformation. Background technique [0002] At present, the effluent index of the municipal sewage treatment project has been raised from the original Class B standard to the Class A standard. The existing mature process flow of municipal sewage treatment is: water inlet→coarse grid→fine grid→grit chamber (primary sedimentation tank)→biochemical reaction tank→secondary sedimentation tank→disinfection tank→water outlet, this process can only achieve the original The effluent index of the first-class B standard cannot meet the current effluent index of the first-class A standard, and cannot meet the effluent water quality requirements after the standard is raised. The reasons...

AI Technical Summary

Problems solved by technology

The disadvantage of this method of phosphorus removal is that as the influent water quality fluctuates, the phosphorus removal effect is not stable and cannot meet the effluent index of 0.5mg / L; if the remaining sludge stays for a long time, the phosphorus in the sludge will be released again

The disadvantage of this method to remove suspended particles (SS) in water is that after two sedimentation, there are still a large number of suspended particles in the water with a specific gravity close to that of water and a particle size of 10-100um. These suspended particles cannot be removed by gravity sedimentation. of

Since the existing sewage plants basically need to remove phosphorus by dosing, this process will increase the SS in the water. If the filter cloth filter is used alone as the advanced treatment process of the sewage plant, the filter cloth will be due to the high SS of the influent Frequent flushing of the filter cloth will reduce the service efficiency and life of the filter, and frequent flushing will also increase the operating cost of the process

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