Treatment method and treatment system for wastewater produced during flue gas desulfurization adopting limestone/lime-gypsum method

A treatment system and a treatment method technology, which are applied in the field of limestone/lime-gypsum method flue gas desulfurization wastewater treatment method and treatment system, can solve the problems of high overall operation cost, no waste recycling effect, complicated operation management, etc. The effect of saving pharmaceutical costs, enhancing industrial value, and strong process controllability
CN105540960AActive Publication Date: 2016-05-04北京国泷环保科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
北京国泷环保科技有限公司
Publication Date
2016-05-04

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Abstract

The invention provides a treatment method for wastewater produced during flue gas desulfurization adopting a limestone / lime-gypsum method. The treatment method comprises steps as follows: (1), lime, sodium sulfate, a heavy metal precipitant, a flocculating agent and a coagulant are added to to-be-treated desulfurization wastewater, precipitation is performed, and acid is added to effluent for neutralization; (2), the effluent in the step (1) is subjected to electrodialysis treatment through a homogeneous-phase monovalent ion exchange membrane, and contributing water containing NaCl and concentrated water containing CaSO4 are formed and are recycled respectively. The invention further provides a treatment system for the wastewater produced during flue gas desulfurization adopting the limestone / lime-gypsum method. According to the treatment method and the treatment system, zero emission is realized, the process is simple, the treatment efficiency is high, waste recycling is realized, an available industrial product can be directly obtained, the agent cost, the equipment cost and the energy consumption are lower, and accordingly, the overall operation and management cost is obviously lower than the cost of a conventional technology.
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Description

technical field

[0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment method and system for limestone / lime-gypsum flue gas desulfurization wastewater. Background technique

[0002] With the rapid development of my country's energy industry and the construction of large-scale coal-fired power plants, fuel consumption continues to increase, SO 2 The amount of emissions is increasing, and the resulting air pollution is also becoming more and more serious. At present, flue gas desulfurization is considered to control SO 2 The most efficient way to reduce emissions. Limestone / lime-gypsum wet flue gas desulfurization is the most widely used and most mature desulfurization process in China and in the world. Generally speaking, the limestone / lime-gypsum wet flue gas desulfurization of coal-fired power plants uses limestone slurry to spray in the absorption tower, and the SO in the flue gas 2 The reaction produces CaSO 3 , CaS...

Claims

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