Desulfurization wastewater treatment process

A technology for desulfurization wastewater and treatment process, which is applied in gaseous effluent wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc. It can solve the problems of cumbersome process and waste of reagents, and achieve improved economic benefits and high energy utilization rate. , the effect of reducing the cost of pretreatment
CN108328835AInactive Publication Date: 2018-07-27中国电建集团透平科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
中国电建集团透平科技有限公司
Publication Date
2018-07-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a desulfurization wastewater treatment process characterized by comprising the following process steps: step 1, pretreatment, namely adding organic sulfur, carbonate and a flocculant into desulfurization wastewater to carry out a reaction, and removing calcium ions and heavy metal ions in the desulfurization wastewater to obtain a pretreatment solution; step 2, evaporationand concentration, namely evaporating and concentrating the pretreatment solution until the content of sodium chloride in a feed liquid is 200-280mg / l; step 3, cooling crystallization, namely carryingout cooling crystallization on the evaporated and concentrated feed liquid to obtain slurry, wherein the crystallization temperature is 20 DEG C or below, and the crystallization time is 0.25-1h; andstep 4, centrifugation and drying, namely carrying out centrifugation and drying treatment on the slurry subjected to cooling crystallization to obtain MgSO4-7H2O. During pretreatment, excessive calcium ions cannot be introduced, and the troublesome step that calcined soda is added to remove the calcium ions is not needed, so that the use amount of a reagent is reduced; in addition, the finally obtained product is MgSO4-7H2O, so that the economic benefit of the wastewater treatment process is increased.
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Description

technical field

[0001] The invention relates to a waste water treatment process, in particular to a desulfurization waste water treatment process. Background technique

[0002] Coal-fired power plants produce a large amount of SO due to burning coal 3 The acid rain pollution caused by the discharge of these fumes has caused huge damage to crops, forests and human health in my country. Therefore, these flue gases cannot be directly discharged into the atmosphere, and these flue gases need to be treated.

[0003] The commonly used treatment method is limestone-gypsum wet desulfurization, and the desulfurization wastewater generated in this process comes from the discharge water of the absorption tower. Wastewater from wet desulfurization contains a large amount of suspended solids, supersaturated sulfite, sulfate, chloride and trace heavy metals, many of which are the first type of pollutants that are strictly controlled in the national environmental protection standards. A...

Claims

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