Process used for refluxing coagulating sedimentation of mud residues in common inclined-tube settling tank

Abstract

The invention discloses a process used for refluxing coagulating sedimentation of mud residues in a common inclined-tube settling tank, which relates to a recycling treatment process of urban reclaimed water and a reconstruction technique of the common inclined-tube settling tank. In the process, by using a principle that mud residue refluxing increases the collision probability of particles during coagulation and improves a dynamic condition of flocculating settling, part of the mud residues at the bottom of the settling tank is directly refluxed into a mixing tank of a previous section of the process, and simultaneously a 1# coagulating agent is added into the mixing tank, and a 2# coagulating agent is added into a third-stage flocculation tank; after passing through a fourth-stage flocculation tank, the mud residues enter the inclined-tube settling tank through a perforated wall to perform mud-water separation; water is yielded after the mud residues are converged by a header tank, the residual mud residues are discharged out from the bottom part through a mud discharging well after being settled by the settling tank, and part of the mud residues is directly refluxed into the mixing tank by the settling tank to realize the continuous operation of the process. The process is suitable for the recycling treatment of the reclaimed water and the upgrading of the common inclined-tube settling tank. The process can reconstruct the original inclined-tube settling tank of a reclaimed water plant simply and conveniently, and does not need to change the original buildings; the addition of the coagulating agents can be saved by about 50 percent; the yielded water has good water quality, the yield water turbidity is lower than 2 NTU, and the yield water total phosphorus is lower than 1 mg / L; and the mud discharge cycle is long, the water for mud discharging is saved by over 90 percent, and the processing efficiency is high.

Description

Technical field: [0001] The invention relates to a recycling treatment process of urban regenerated water and a transformation technology of an ordinary inclined tube sedimentation tank, belonging to the technical field of resources and environment. Background technique: [0002] With the development of economy and society, the contradiction of shortage of water resources has become more prominent. Urban reclaimed water reuse is an effective way to solve this problem. In the current reclaimed water reuse technology, coagulation-sedimentation is the first step in the treatment process. The key, because its effectiveness directly affects the quality of the treatment effect and whether the subsequent treatment process can be carried out smoothly. [0003] The purpose of coagulation and sedimentation treatment of reclaimed water is to economically and effectively remove particulate pollutants in the raw water of reclaimed water. The existence of these substances not only destroy...

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Problems solved by technology

[0003] The purpose of coagulation and sedimentation treatment of reclaimed water is to economically and effectively remove particulate pollutants in the raw water of reclaimed water. The existence of these substances not only destroys the sensory effect of water, but more importantly, various organic pollutants carried by these tiny particles have a great impact on water quality. The impact directly leads to the reduction of water use value

[0004] Since the coagulation-sedimentation process for reclaimed water is still a new thing in my country and even in the world, the design of some coagulation-sedimentation processes for reclaimed water treatment lacks experimental basis, and they are mostly designed with reference to the design parameters of conventional water supply treatment technologies, without considering the water quality of reclaimed water. characteristics, resulting in some unreasonable treatment processes and design parameters, such as the most common inclined tube sedimentation tank in water treatment, common problems in the process of reclaimed water treatment are high chemical consumption, low treatment efficiency, and unstable treatment effects, etc.

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