A kind of recycling method of desulfurization wastewater

A technology for desulfurization wastewater and concentrated water, which is applied in chemical instruments and methods, gaseous effluent wastewater treatment, water/sewage multi-stage treatment, etc. , to achieve the effect of increasing salt content, reducing material and energy consumption, and improving conversion efficiency

Active Publication Date: 2017-06-30
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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  • Description
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Problems solved by technology

Many heavy metal ions are quite toxic, and heavy metal ions have no self-purification and biodegradability in nature. After being discharged into water, they will continue to enrich through the biological chain, causing great harm to the life activities of animals and plants.

Method used

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  • A kind of recycling method of desulfurization wastewater

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Embodiment Construction

[0021] With reference to the accompanying drawings, the desulfurization wastewater entering the process of the present invention is first processed in step (1): the desulfurization wastewater is treated with precipitation, chelating resin and ultrafiltration system, large particle substances are removed by precipitation, and ultrafiltration (UF) To remove small suspended solids and colloids, the desulfurization wastewater first enters the sedimentation tank for precipitation, and the effluent enters the ultrafiltration system. The ultrafiltration system produces water, which is treated with chelating resin and then enters step (2). The concentrated water enters the sedimentation tank for precipitation. . In step (1), the recovery rate of ultrafiltration is controlled above 95%, and the removal rate of total suspended solids TSS reaches above 98%, <1mg / L; after treatment with chelating resin, heavy metal ions <1mg / L . The above parameters can also be adjusted according to the ...

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Abstract

The invention provides a method for recycling desulfurization wastewater, which uses a bipolar membrane to treat the desulfurization wastewater, and the bipolar membrane system operates in a partial circulation and partial water outlet mode, wherein there are 4 salt solutions, acid solutions, alkali solutions, and polar solutions Like liquid, keep circulating to get acid and alkali with a certain concentration, and the lye returns to the factory to absorb SO 2 , SO 3 , the acid solution is reused to the factory production process. The invention innovatively adopts the technology of "pretreatment + membrane integration technology" to treat desulfurization wastewater, and prepare waste salt into useful acid and alkali. Among them, alkali liquor can reabsorb sulfur-containing flue gas to become sulfate, and acid is used as chemical raw material It can be used directly to complete the entire ecological cycle, using the characteristics of ultrafiltration, nanofiltration membranes, and bipolar membranes to treat desulfurization wastewater, and concentrate to prepare acid and alkali for comprehensive utilization.

Description

technical field [0001] The invention relates to a process for comprehensive recycling of desulfurization wastewater. Background technique [0002] In recent years, with the growing national economy, the demand for electricity has increased rapidly, and the number of coal-fired power generation units used as the main power supply has increased year by year. There are thousands of thermal power plants in the country, and the amount of coal burned is also very large. And global environmental problems are becoming more and more prominent, so all thermal power plants have invested in flue gas desulfurization systems to control the emission of sulfur oxides through flue gas desulfurization technology. Since the desulfurization process uses wet desulfurization, a large amount of waste water is produced, which contains a large amount of salt and heavy metal ions, and direct discharge will cause new pollution. Therefore, the waste water must be treated to meet the qualified discharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F103/18
Inventor 李永飞楼永通李嘉陈良
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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