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Treating method and treating device for zero discharging of desulfurization wastewater

A treatment method and technology for desulfurization wastewater, applied in the direction of gaseous effluent wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of operation stability and poor treatment effect, and achieve the elimination of scaling and improve stability Sexuality, the effect of reducing hardness

Pending Publication Date: 2017-03-22
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, what the present invention intends to solve is that the existing desulfurization wastewater treatment process and device have the defects of poor operation stability and treatment effect, and then provide a kind of operation stability and treatment effect, low cost, high purity of sodium chloride recovery, Zero-discharge desulfurization wastewater treatment method and device

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  • Treating method and treating device for zero discharging of desulfurization wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a zero-discharge treatment method for desulfurization wastewater. The processing method includes the following steps:

[0051] (1) The desulfurization wastewater of a coal-fired power plant enters the aeration adjustment device for aeration treatment, and the aeration-treated wastewater enters the pre-sedimentation device for static precipitation, and the first effluent is collected. Among them, the COD in the desulfurization wastewater is 1000mg / L, TDS66800mg / L, Na + 4600mg / L, Cl - 13000mg / L, Mg 2+ 44000mg / L, Ca 2+ 2400mg / L, SO 4 2- 36000mg / L, SiO 2 250mg / L, TSS13000mg / L, pH 6.5, turbidity 752.8NTU, first effluent COD 186mg / L, TDS41000mg / L, Na+4000mg / L, Cl - 8200mg / L, Mg 2+ 23800mg / L, Ca 2+ 1400mg / L, SO 4 2- 21200mg / L, SiO 2 <135mg / L, TSS 708mg / L, turbidity 23.71NTU, turbidity removal rate reaches 96.9%;

[0052] (2) The first effluent enters the coagulation treatment device for coagulation treatment, and the coagulation treatment...

Embodiment 2

[0058] This embodiment provides a zero-discharge treatment method for desulfurization wastewater. The processing method includes the following steps:

[0059] (1) The desulfurization wastewater of a coal-fired power plant enters the aeration adjustment device for aeration treatment, and the aeration-treated wastewater enters the pre-sedimentation device for static precipitation, and the first effluent is collected. Among them, the COD in the desulfurization wastewater is 1000mg / L, TDS55800mg / L, Na + 4300mg / L, Cl - 12000mg / L, Mg 2+ 40000mg / L, Ca 2+ 2500mg / L, SO 4 2- 22000mg / L, SiO 2 250mg / L, TSS17000mg / L, pH 6.0, turbidity 752.8NTU, first effluent COD 140mg / L, TDS34260mg / L, Na+3741mg / L, Cl - 7560mg / L, Mg 2+ 21600mg / L, Ca 2+ 1450mg / L, SO 4 2- 12980mg / L, SiO 2 <130mg / L, TSS 900mg / L, turbidity 23.6NTU;

[0060] (2) The first effluent enters the coagulation treatment device for coagulation treatment, and the coagulation treatment device is added with a dosage of 1000m...

Embodiment 3

[0066] This embodiment provides a zero-discharge treatment method for desulfurization wastewater. The processing method includes the following steps:

[0067] (1) The desulfurization wastewater of a coal-fired power plant enters the aeration adjustment device for aeration treatment, and the aeration-treated wastewater enters the pre-sedimentation device for static precipitation, and the first effluent is collected. Among them, the COD in the desulfurization wastewater is 1000mg / L, TDS66800mg / L, Na + 4600mg / L, Cl - 13000mg / L, Mg 2+ 44000mg / L, Ca 2+ 2400mg / L, SO 4 2- 36000mg / L, SiO 2 250mg / L, TSS13000mg / L, pH 6.5, turbidity 752.8NTU, first effluent COD 180mg / L, TDS41000mg / L, Na+4000mg / L, Cl - 8200mg / L, Mg 2+ 23800mg / L, Ca 2+ 1400mg / L, SO 4 2- 21200mg / L, SiO 2 <135mg / L, TSS 708mg / L, turbidity 23.71NTU;

[0068] (2) The first effluent enters the coagulation treatment device for coagulation treatment. In the coagulation treatment device, iron-based flocculant with a d...

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Abstract

The invention discloses a treating method and a treating device for zero discharging of desulfurization wastewater. The treating method comprises the following steps: (1) performing aeration treatment and pre-sedimentation treatment on the desulfurization wastewater and collecting a first effluent; (2) performing coagulation treatment and softening treatment on the first effluent in turn, thereby obtaining a second effluent; (3) performing ultra-filtration treatment and ion exchange treatment on the second effluent in turn and collecting a third effluent; (4) performing nano-filtration treatment on the third effluent and collecting clean water; (5) performing reverse osmosis treatment on the clean water, thereby obtaining second concentrated water; (6) performing crystallizing treatment on the second concentrated water, thereby obtaining a crystal salt, and meanwhile, collecting the water generated in the steps (5) and (6), thereby obtaining water meeting standard. The device comprises an aeration adjusting device, a pre-sedimentation device, a coagulation treatment device, a softening treatment device, an ultra-filtration device, an ion exchange device, a nano-filtration device, a reverse osmosis device and a crystallizing device. The device has the advantages of running stability, good wastewater treatment effect and high recycling purity of sodium chloride.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a zero-discharge treatment method and device for desulfurization wastewater. Background technique [0002] Desulfurization wastewater is mainly the water discharged from the absorption tower during the wet desulfurization process of boiler flue gas. It has the characteristics of complex composition, large fluctuations in water quality and water volume, high content of suspended solids and high hardness, which makes its treatment difficult. Scaling is easy during the process, which affects the smooth progress of the treatment process. At present, there is no mature experience in the treatment of desulfurization wastewater in China. In the process of desulfurization wastewater treatment in foreign coal-fired thermal power plants, evaporation and crystallization processes are adopted, and mixed salts are finally obtained, but the solid substances produced by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01D3/06C02F103/18
CPCC01D3/06C02F9/00C02F1/42C02F1/442C02F1/441C02F1/444C02F1/5245C02F1/5236C02F1/52C02F2103/18C02F2301/08C02F2305/026C02F1/56C02F1/766C02F1/725C02F1/722C02F5/08C02F5/02C02F2101/101C02F2101/10
Inventor 陈福泰李廷英杨艳翟玉斌
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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