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Method for treating flue gas desulfurization wastewater through combination of coagulating sedimentation-aerobics-chemical oxidation

A desulfurization wastewater, chemical oxidation technology, applied in the direction of sedimentation treatment, chemical instruments and methods, multi-stage water treatment, etc.

Inactive Publication Date: 2019-04-16
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there is a technical bottleneck problem in the current treatment method that the flue gas desulfurization wastewater can reach the standard stably, and a combined technology of "coagulation sedimentation-aerobic-chemical oxidation" is proposed to treat the difficult-to-treat flue gas desulfurization wastewater Methods

Method used

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  • Method for treating flue gas desulfurization wastewater through combination of coagulating sedimentation-aerobics-chemical oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0025] First, add lime milk to the coagulation tank 1 for coagulation treatment. The ratio of lime dry basis to flue gas desulfurization wastewater mass is 0.001, the pH is about 9, and the reaction time is 10 minutes; then the coagulation effluent enters the vertical tank. Flow-type sedimentation tank 2, the sedimentation time is 1 hour; then the sedimentation water enters the intermediate storage tank 3 and adjusts the pH to 7.5 and BOD 5 :N:P is 100:5:1, the hydraulic retention time of the wastewater in the intermediate storage tank 3 is 1 hour; then the wastewater enters the MBR 4, and the hydraulic retention time in the MBR is 4 hours; finally the MBR effluent is in the chemical aerobic tank 7 After being mixed with the added hydrogen peroxide in the pipe static mixer 6 installed on the water inlet pipe, it enters the chemical oxidation tank 7, and the ratio of the hydrogen peroxide dosing quality to the flue gas desulfurization wastewater quality is controlled to be 0.001...

Embodiment 2

[0027] First add lime milk for coagulation treatment. The ratio of lime dry basis to flue gas desulfurization wastewater mass is 0.0015, the pH is about 9.5, and the reaction time is 15 minutes; then the coagulation effluent enters the vertical flow sedimentation tank. The precipitation time is 1.5 hours; then the precipitation water enters the intermediate storage tank and adjusts the pH to 7.5 and BOD 5 :N:P is 100:5:1, the hydraulic retention time of the wastewater in the intermediate storage tank is 1 hour; then the wastewater enters the MBR, and the hydraulic retention time in the MBR is 6 hours; finally, the MBR effluent enters the chemical oxidation tank, and hydrogen peroxide is added The ratio of quality to flue gas desulfurization wastewater quality is 0.0012, the pH of wastewater is 8, the chemical oxidation time is 3 hours, the ultraviolet wavelength is 254nm, the COD of chemical oxidation effluent is 110mg / L, and the fluoride ion concentration is 4.5mg / L, which mee...

Embodiment 3

[0029] First add lime milk for coagulation treatment. The ratio of lime dry basis to flue gas desulfurization wastewater mass is 0.002, the pH is about 10, and the reaction time is 20 minutes; then the coagulation effluent enters the vertical flow sedimentation tank. The precipitation time is 2 hours; then the precipitation water enters the intermediate storage tank and adjusts the pH to 7.5 and BOD 5 :N:P is 100:5:1, the hydraulic retention time of the wastewater in the intermediate storage tank is 1 hour; then the wastewater enters the MBR, and the hydraulic retention time in the MBR is 8 hours; finally, the MBR effluent enters the chemical oxidation tank, and hydrogen peroxide is added The ratio of the quality to the quality of flue gas desulfurization wastewater is 0.0015, the pH of wastewater is 8.5, the chemical oxidation time is 4 hours, the ultraviolet wavelength is 254nm, the COD of chemical oxidation effluent is 98mg / L, and the fluoride ion concentration is 3mg / L, whi...

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Abstract

The invention relates to a method for treating flue gas desulfurization wastewater through combination of coagulating sedimentation-aerobics-chemical oxidation. The method includes the steps that 1, under the stirring effect of a coagulating basin stirring paddle, lime or lime milk is put and acts with suspended solids, heavy metal ions, fluorine ions and calcium ions to form sediments; 2, coagulating effluent in the first step enters a vertical-flow type sedimentation basin for solid-liquid separation; 3, sedimentation effluent enters a middle water storage pond, the pH of effluent is adjusted to be 6.5-9, and BOD 5:N:P is adjusted to be 100:5:1; 4, effluent of the middle water storage pond enters an aerobic pond, wherein a membrane reaction tank (MBR) is selected as the aerobic pond; 5,aerobic effluent enters a chemical oxidation pond, a pipeline static mixer is installed on a water inlet pipeline to mix an oxidizing agent and the effluent, ultraviolet lamp tubes are installed in the chemical oxidation pond, the pH of the effluent is 6-9, chemical oxidation time is 2-4 hours, the COD of the effluent is 150 mg / L, and the concentration of fluorine ions of the effluent is 10 mg / L.Through the method, the effluent can be stably treated according to standards, and operating costs are low.

Description

technical field [0001] The invention relates to the technical field of environmental engineering wastewater treatment, in particular to a method for jointly treating flue gas desulfurization wastewater by "coagulation sedimentation-aerobic-chemical oxidation". Background technique [0002] my country's energy structure is "rich in coal and low in oil", with coal as the mainstay. Coal-fired power plants produce a large amount of acid gas SO during coal combustion. 2 , will seriously pollute the environment and endanger people's health. Therefore, the country has continuously raised the emission standards of air pollutants from coal-fired power plants. For SO in flue gas 2 Limestone-gypsum flue gas desulfurization technology is currently the most mature and widely used desulfurization process. This process will discharge a certain amount of desulfurization wastewater to prevent equipment corrosion and ensure the quality of gypsum. This desulfurization wastewater contains sus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/18C02F101/30
CPCC02F1/32C02F1/5245C02F1/722C02F3/1268C02F9/00C02F2001/007C02F2101/30C02F2103/18C02F2301/08
Inventor 李立峰霍莹高溪郑贝贝付连超王超李亮周立山滕厚开
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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