High-efficiency sedimentation basin and process thereof

Abstract

The invention provides a high-efficiency sedimentation basin and a process thereof. The high-efficiency sedimentation basin comprises a mixing unit, a flocculation unit and a concentration unit which are successively connected, wherein the mixing unit comprises a mixing basin used for carrying out mixing under stirring; the top of the mixing basin is provided with a sodium hydroxide feeding pipe, a ferric trichloride feeding pipe and a heavy metal capturing agent feeding pipe; the flocculation unit comprises a flocculation basin communicated with the mixing basin; the top of the flocculation basin is provided with a powdery active carbon feeding device; the concentration unit comprises a concentration basin communicated with the flocculation basin and is connected with a concentrated water reflux pipeline; and the concentrated water reflux pipeline receives concentrated water conveyed by a CMF membrane system. The high-efficiency sedimentation basin provided by the invention improves conventional high-efficiency sedimentation basin technology, is more applicable to treatment of desulphurization wastewater, can effectively remove fluorides, heavy metal ions (such as arsenic ions, lead ions and chromium ions) and other pollutants produced in wet-process desulphurization through reaction and precipitation, guarantees the operation environment of a subsequent membrane treatment process and produces good environmental benefits.

Description

technical field [0001] The invention relates to the technical field of power plant desulfurization wastewater treatment, in particular to a high-efficiency sedimentation tank used for power plant desulfurization wastewater treatment and a sedimentation process using the sedimentation tank. Background technique [0002] For power plants that generate electricity by burning coal, it is usually necessary to desulfurize the coal, which will generate a large amount of desulfurization wastewater. Therefore, it is necessary to treat the above-mentioned desulfurization wastewater to avoid environmental pollution. At present, the existing desulfurization wastewater treatment process mainly uses wastewater treatment equipment consisting of mixing unit, reaction zone, precipitation / concentration zone and inclined tube separation zone to treat wastewater. [0003] The principle of the existing desulfurization wastewater treatment process is: in the mixing reaction zone, the rapid coagu...

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Problems solved by technology

[0005] (1) The desulfurization wastewater is poorly targeted, occupies a large area, and consumes a lot of investment

[0006] (2) The dosing agent is detrimental to the advanced treatment process in the later stage

[0008] (4) The consumption of medicine is large, and it is not targeted

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