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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

Inactive Publication Date: 2018-07-27
中国电建集团透平科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to overcome the cumbersome process and the waste of reagents caused by the introduction of excess calcium ions in the treatment of desulfurization wastewater in the prior art, the present invention provides a desulfurization wastewater treatment process through which desulfurization wastewater is treated without introducing excess calcium during pretreatment ions, no need to increase the cumbersome steps of adding soda ash to remove calcium ions, reducing the amount of reagents used, and the final product is MgSO 4 •7H 2 O, improve the economic benefits of wastewater treatment process

Method used

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Embodiment 1

[0057] This embodiment provides a treatment process for desulfurization wastewater, through which MgSO 4 •7H 2 O, not only saves the use of reagents, simplifies the processing steps, but also recovers MgSO with high economic value 4 •7H 2 O, is a low-cost and energy-saving zero-discharge process for desulfurization wastewater, which realizes zero discharge of desulfurization wastewater from power plants. The process specifically includes the following steps:

[0058] Step 1, preprocessing

[0059] Add organic sulfur, soda ash and flocculant to the desulfurization wastewater to react, remove calcium ions and heavy metal ions in the desulfurization wastewater, and obtain a pretreatment liquid; the weight of the added organic sulfur, soda ash and flocculant is:

[0060] Organic sulfur: according to 1 m 3 It is required to add 0.05kg of organic sulfur to the desulfurization wastewater,

[0061] Soda ash: Measured according to the weight of calcium ions in the desulfurization...

Embodiment 2

[0072] This embodiment is basically the same as Embodiment 1, the difference is:

[0073] In step 1, organic sulfur: according to 1 m 3 It is required to add 0.08kg of organic sulfur to the desulfurization wastewater,

[0074] Soda ash is replaced by magnesium carbonate: according to the weight of calcium ions in the desulfurization wastewater, if there is 1g of calcium ions in the desulfurization wastewater, add 1.1g of magnesium carbonate,

[0075] Flocculant: The added flocculant is 0.6‰ of the weight of desulfurization wastewater.

[0076] Organic sulfur, magnesium carbonate, flocculant and desulfurization wastewater are mixed in a reaction tank, and reacted under normal temperature and pressure conditions, and the reaction time is 0.55h. The filtration method of primary filtration and secondary filtration is: ultrafiltration.

[0077] In step 2, the temperature of the feed liquid in the first-effect falling film evaporator 9 is 88°C. The temperature of the feed liquid...

Embodiment 3

[0080] Organic sulfur: according to 1 m 3 It is required to add 0.12kg of organic sulfur to the desulfurization wastewater,

[0081] Soda ash is replaced by potassium carbonate: according to the weight of calcium ions in the desulfurization wastewater, if there is 1g of calcium ions in the desulfurization wastewater, add 1.5g of potassium carbonate,

[0082] Flocculant: The added flocculant is 1.2‰ of the weight of desulfurization wastewater.

[0083] Organic sulfur, potassium carbonate, flocculant and desulfurization wastewater are mixed in a reaction tank, and reacted under normal temperature and pressure conditions, and the reaction time is 0.75h. The filtration method of primary filtration and secondary filtration is: microfiltration.

[0084] In step 2, the temperature of the feed liquid in the first-effect falling film evaporator 9 is 90°C. The temperature of the feed liquid in the two-effect falling film evaporator 10 is 80°C, the temperature of the feed liquid in th...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F5/40C02F103/18C02F101/20C02F101/10
CPCC01F5/40C02F1/001C02F1/04C02F1/442C02F1/444C02F1/52C02F9/00C02F2101/10C02F2101/101C02F2101/20C02F2103/18
Inventor 梁彬黄丽川
Owner 中国电建集团透平科技有限公司
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