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Thermal power plant wet desulphurization wastewater advanced treatment combined process

A wet desulfurization and advanced treatment technology, applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of few pilot test or engineering application cases, complex management and maintenance process, and easy occurrence Operation management and other issues to achieve the effect of salt recovery, high-quality water production, and improved chemical stability

Inactive Publication Date: 2020-04-14
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the overall treatment process is long, the management and maintenance process is complicated, and there are significant membrane fouling problems in the high-pressure membrane process, and the salt separation efficiency is not high. As a result, many zero-emission processes are actually in the stage of laboratory verification, pilot test or engineering application. There are few cases, and it is prone to operation management problems

Method used

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  • Thermal power plant wet desulphurization wastewater advanced treatment combined process
  • Thermal power plant wet desulphurization wastewater advanced treatment combined process

Examples

Experimental program
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Effect test

Embodiment 1

[0028] "Microfiltration + membrane distillation" is used for advanced treatment of power plant desulfurization wastewater. The wastewater is taken from a power plant. The pH, chroma, turbidity, COD, and conductivity of the wastewater are 6.57, 480 times, 73NTU, 1647mg / L, and 58.03mS / cm respectively. . The PVDF microfiltration membrane is used for suspended solids treatment, the average pore size of the membrane is 0.13μm, and the turbidity of the effluent is lower than 2.5NTU. Further adopt membrane distillation treatment, adopt PVDF hydrophobic membrane, the cold side temperature is 20, the heat measurement temperature is 40-80°C, and the produced water flux is 10.63-37.00kg / m 2 h, the conductance of the product water was lower than 10μS / cm under all temperature conditions, and the salt rejection rate was higher than 99.99%. The removal rate of suspended matter, potassium, calcium, sodium, magnesium, sulfate, Cl and COD in the overall process is higher than 97%.

Embodiment 2

[0030] PAM is used to treat the suspended solids of desulfurization wastewater. The desulfurization wastewater is taken from a power plant with a pH of 4.78, SS of 78.47g / L, COD of 820mg / L, and conductance of 68.6μS / cm. Under the condition that the dosage of PAM is 0.2g / L, the turbidity of the effluent is 27.5NTU. Further use PVDF microfiltration membrane for suspended matter treatment, the membrane pore size is 0.13μm, and the turbidity of the effluent is lower than 2NTU. Afterwards, membrane distillation was used for advanced treatment. The hydrophobic membrane used was PVDF-CTFE membrane. Under the conditions of temperature difference of 40°C and cold side flow rate of 0.3 L / min, the hot side flow rate was 0.2, 0.3, 0.4 L / min. The water flux is 24.43, 25.24, 26.42kg / m 2 h. After continuous operation for 6 hours, the conductivity of the product water is lower than 10μS / cm, and the salt rejection rate is higher than 99.99%. Membrane distillation process exhibits high produ...

Embodiment 3

[0032] A combined process is used to treat desulfurization wastewater. The wastewater is taken from a power plant. The pH, conductivity, turbidity, SCOD, SS, and TDS are 6.7, 22.9mS / cm, 2506NTU, 347mg / L, 3.28g / L, 31.39g / L and 28.225g / L. Magnetic loading lime coagulation is used for treatment, the magnetic seed particle size is 400 mesh, the dosage of PAC, PAM, magnetic seed, and lime is 600, 3.75, 600, 800mg / L respectively, and the speed and time of fast stirring are 350rpm and 20s. The turbidity of the product water is 3.27NTU, the removal rate of suspended solids is 99.87%, the hardness and organic matter have been removed to a certain extent, and the amount of sludge is 2 / 3 of that of conventional coagulation. Afterwards, membrane distillation was used for advanced treatment. The hydrophobic membrane used was PVDF-CTFE membrane. When the temperature difference was 30°C, it was operated continuously for 100 hours, and the membrane flux dropped from 16.03 to 13.82kg / m 2 h, t...

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Abstract

The invention relates to a thermal power plant wet desulphurization wastewater advanced treatment combined process, which comprises the coupling of coagulation, microfiltration / ultrafiltration and membrane distillation processes. Wastewater pretreatment is carried out by adopting coagulation, so that suspended solids which are difficult to settle by gravity in the desulfurization wastewater are effectively removed. Particularly, in the coagulation process, magnetic coagulation and sand loading coagulation are adopted to improve the solid-liquid separation efficiency; micro-filtration / ultra-filtration is adopted to further remove particulate matters, colloids and macromolecular organic matters, so that further decolorization is realized. Particularly, aiming at the conditions of high salt and high chlorine of the desulfurization wastewater, an inorganic membrane can be adopted in the microfiltration / ultrafiltration membrane process so as to realize higher pollution resistance and operation stability; advanced treatment of desulfurization wastewater is carried out by adopting membrane distillation, so that the interception efficiency of organic matters, salt and chromaticity is 97% or above. According to the process, coagulation, a low-pressure membrane process and a membrane distillation process are innovatively combined, efficient and stable treatment of the desulfurization wastewater can be realized through a simple and short process, and meanwhile, the combined process can adapt to the change of the quality and quantity of the desulfurization wastewater.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment of desulfurization wastewater, and in particular relates to a combined process of "coagulation-microfiltration / ultrafiltration-membrane distillation". Background technique [0002] Desulfurization wastewater is the wastewater discharged from the desulfurization system by the flue gas desulfurization system of thermal power plants to ensure the Cl- content of the system and the quality of gypsum. Large changes and other characteristics are the most difficult problems to solve in power plant water treatment. At present, the process of treating desulfurization wastewater in power plants is mainly the triple box process, that is, the treatment of suspended solids and heavy metals is realized through the method of "coagulation + chemical precipitation". However, the three-box process has large dosage, slow solid-liquid separation rate, poor separation effect, large amount of sludge, and the...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/30C02F103/18
CPCC02F1/444C02F1/447C02F1/488C02F1/5236C02F1/56C02F9/00C02F2101/30C02F2103/18
Inventor 魏源送郑利兵郁达伟钟慧
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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