Cyclic utilization method of desulphurization waste water

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. It can solve the problems of heavy metal ions without self-purification and biodegradability, animal and plant life activities hazards, etc. , to achieve the effects of increasing salt content, reducing material and energy consumption, and reducing production costs

Active Publication Date: 2015-12-02
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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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 discharg

Method used

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  • Cyclic utilization method of desulphurization waste water

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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 cyclic utilization method of desulphurization waste water. A bipolar membrane is used for treating the desulphurization waste water, a bipolar membrane system is operated in a way that partial water is circulated and partial water is discharged, four solutions, namely, a salty solution, an acid solution, an alkaline solution and a polar solution are continuously circulated to obtain acid and alkali which have a given concentration, the alkaline solution is returned to a factory to absorb SO2 and SO3, and the acid solution is reused in a factory production process. The desulphurization waste water is treated by adopting a pretreatment and membrane integration technology, the waste salt is made into useful acid and alkali, the alkaline solution can be reused for absorbing sulfur-containing smoke to form sulfate, acid is directly used as a chemical raw material, the entire ecological circulation is completed, the desulphurization waste water is treated by utilizing the characteristics of ultrafiltration, a nano-filtration membrane and a bipolar membrane, the concentration solution is used for preparing acid and alkali, and comprehensive utilization is realized.

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...

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Application Information

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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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