Vertical flow coagulation sedimentation and air flotation dual-purpose tank

Abstract

The invention relates to a vertical flow type coagulating sedimentation and air floatation tank. The vertical flow type coagulating sedimentation and air floatation tank comprises a barrel as well as a coagulation basin and a flocculation basin which are located on the outer side part of the barrel, wherein an overflow port in the upper part of the coagulation basin is communicated with the flocculation basin; the barrel is characterized in that an annular overflow weir is arranged along the upper part of the inner side of the barrel wall, a water inlet formed in the upper part of a central barrel is connected and communicated with an outlet of the flocculation basin through a water inlet pipe, an air dissolving port in the lower part is connected and communicated with an air dissolving water pipe, upper and lower end surfaces of the central barrel are open, a stirring motor mounted at the top of the barrel is connected with a stirring shaft supported on the barrel, a residue scratch board is arranged at the upper part of the stirring shaft, a sludge scraping board is arranged at the bottom of the stirring shaft, a sludge collecting trough is arranged at the lower part of the residue scratch board, a sludge discharge pipe at the bottom of the sludge collecting trough extends out of the barrel, a clear liquid outlet in the upper part of the barrel is connected and communicated with a water outlet pipe, and the water outlet pipe is further connected and communicated with the air dissolving water pipe which is connected and communicated with an air dissolving pump. The vertical flow type coagulating sedimentation and air floatation tank is compact in structure, low in energy consumption and good in sludge and water separation effect, occupies small area and can solve the problems of bubbled sludge in effluent and sludge deposition at the bottom.

Description

Technical field [0001] The invention relates to a vertical flow type coagulation sedimentation and air flotation dual-purpose tank, belonging to the technical field of sewage treatment equipment. Background technique [0002] Coagulation sedimentation and coagulation air flotation processes are common processes in the treatment of high-concentration organic wastewater such as coking wastewater, landfill leachate, coking wastewater, and oily wastewater. By adding coagulants and coagulants to the wastewater, Suspended solids and colloids polymerize with each other to form flocs. The volume of the flocs increases and settles or floats, which can greatly reduce the suspended solids and organic content in the wastewater, and the water quality is significantly improved. [0003] The existing coagulation sedimentation and coagulation air flotation processes usually use two independent tanks. According to the direction of water flow, the sedimentation tank can be divided into advection sed...

AI Technical Summary

Problems solved by technology

However, the above-mentioned structure only relies on the liquid flocculation and sedimentation after the body is mixed to separate the mud and water. On the one hand, the flocs in the coagulation liquid float up with air bubbles, and the concentration of suspended solids in the effluent is high, which will cause the phenomenon of "foaming mud" and cannot treat fine flocs. Further separation increases the workload and difficulty of subsequent processing

On the other hand, since the sludge in the lower part of the sedimentation area will produce sedimentation, if the sludge discharge time is not properly controlled, it will easily cause sludge compaction, which will cause the problem of sludge discharge blockage

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