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A zero-discharge process for desulfurization wastewater

A desulfurization wastewater and zero-discharge technology, which is applied in the direction of gaseous effluent wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of heavy metal ions without self-purification and biodegradability, animal and plant life activities Harm and other issues to achieve the effect of improving competitiveness and reducing environmental pollution

Active Publication Date: 2017-08-22
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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AI Technical Summary

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 zero-discharge process for desulfurization wastewater

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Embodiment Construction

[0017] 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 a sedimentation tank, softening resin and ultrafiltration system; the desulfurization wastewater first enters the sedimentation tank for precipitation, and the effluent enters the ultrafiltration system, the ultrafiltration system produces water into the softening resin, and then enters the treatment of step (2), the concentrated water enters the sedimentation tank for sedimentation, and the regeneration solution of the softened resin also enters the sedimentation tank for sedimentation. After step (1), the water quality reaches the following indicators : Sodium sulfate=5-20% (mass percentage), TSS<1mg / L; COD<100mg / L;.

[0018] (2) The electrodialysis system is used for treatment, and the electrodialysis system is divided into fresh water, concentrated water and extreme wat...

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Abstract

The invention provides a zero-discharge method for desulfurization wastewater, which uses an electrodialysis system to treat the desulfurization wastewater, directs concentrated water to a spray furnace for incineration or evaporation, and uses a reverse osmosis system for fresh water treatment, and the water produced by the reverse osmosis system is directly reused , concentrated water is returned to the electrodialysis system for treatment. The invention innovatively adopts the technology of "pretreatment + membrane integration technology" to treat desulfurization wastewater, economically treat wastewater, and solve the characteristics of large pollution and high difficulty of desulfurization wastewater commonly found in thermal power plants at present, and can make most of the water resources recovered. To improve the competitiveness of thermal power plants and reduce environmental pollution.

Description

technical field [0001] The invention relates to a technology for zero discharge 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 stand...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/18
Inventor 翟文浩楼永通李嘉陈良
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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