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A treatment process for power plant flue gas desulfurization wastewater

A desulfurization wastewater and treatment process technology, applied in the field of water treatment, can solve the problems of heavy metals forming waste solids, complex treatment procedures, etc., achieve the effect of simple process and overcome complex treatment procedures

Active Publication Date: 2016-06-08
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The invention provides a technically simple and efficient flue gas desulfurization wastewater treatment process for power plants, which solves the shortcomings of the traditional wastewater treatment method that the treatment process is complicated and heavy metals cannot be recovered and waste solids will be formed

Method used

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  • A treatment process for power plant flue gas desulfurization wastewater

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Embodiment 1

[0031] For the desulfurization wastewater of a power plant, the calcium sulfate content is 2000mg / L, the heavy metal content is 20mg / L, and the pH is 5.3.

[0032] After the desulfurization wastewater is filtered through the plate and frame, the sintered microporous filter rod is filtered to obtain a clear filtrate without suspended matter. Wherein the sintered microporous filter rod is cleaned by air blowback, the filter aperture is 0.45 microns, and the air blowback pressure is 0.2MPa.

[0033] The clarified liquid is concentrated by an electrodialysis membrane unit with a pH adjustment function, and the concentration ratio is 40 times. The fresh water is reused, and the concentrated water enters the calcium sulfate seed crystal crystallization device. The pH adjustment function of the electrodialysis membrane unit comes from the bipolar membrane. In the electrodialysis membrane unit, part of the negative membrane is replaced by a bipolar membrane. Two sets of JED-5000, 200 ...

Embodiment 2

[0037] For desulfurization wastewater from a power plant, its calcium sulfate content is 2200mg / L, heavy metal content is 30mg / L, and pH is 6.5.

[0038]After the desulfurization wastewater is filtered through the plate and frame, the sintered microporous filter rod is filtered to obtain a clear filtrate without suspended matter. Wherein the sintered microporous filter rod is cleaned by air blowback, the filter aperture is 1.0 micron, and the air blowback pressure is 0.3MPa.

[0039] The clarified liquid is concentrated by an electrodialysis membrane unit with a pH adjustment function, and the concentration ratio is 40 times. The fresh water is reused, and the concentrated water enters the calcium sulfate seed crystal crystallization device. The pH value adjustment function of the electrodialysis membrane unit comes from the bipolar membrane. In the electrodialysis membrane unit, part of the negative membrane is replaced by a bipolar membrane, and a set of JED-5000, 200 is use...

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Abstract

The invention relates to a wastewater treatment process, and in particular relates to a power plant flue gas desulfurization wastewater treatment process. The process comprises three steps as follows: I, carrying out plate frame filtration on desulfurated wastewater in a power plant, and implementing microporous filtration so as to obtain a clear filtrate without suspended solids; II, concentrating the clear filtrate by virtue of an electrodialysis membrane unit having a pH value regulating function, and recycling concentrated fresh water; and III, carrying out microporous filtration on a mixture in a concentrated water room, recovering filter residue, crystallizing the filtrate in a calcium sulfate crystal seed crystallizing device, and separating out calcium sulfate crystal. The wastewater treatment process disclosed by the invention is simple in process, and capable of effectively recovering heavy metals and achieving a purpose of zero discharge of desulfurized wastewater in a real sense.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a process for treating waste water from flue gas desulfurization in a power plant. Background technique [0002] my country is recognized as a resource-rich country in the world, and its coal production ranks among the top in the world. Coal accounts for more than 80% of all major energy sources, and surveys show that 90% of sulfide emissions in the atmosphere come from incomplete combustion of coal. Environmental pollution is becoming more and more serious, and people are more deeply aware that in order to improve the environment, the first thing to do is to reduce the burning of coal, and reducing the burning of coal has many infeasibility. The waste water is treated twice to realize its recycling. At present, when thermal power plants generate electricity, a large amount of flue gas is often generated, and the flue gas is often desulfurized by wet desulfur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F103/18
CPCC02F1/003C02F1/444C02F1/469C02F1/5209C02F1/66C02F9/00C02F2001/5218C02F2103/18C02F2301/00
Inventor 金可勇胡鉴耿金水玉高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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