Desulfurization wastewater zero discharging process with carbon dioxide method

A technology for desulfurization wastewater and carbon dioxide, applied in ammonium chloride, ammonium halide, chemical recovery, etc., can solve the problems of high operating cost of electric energy, inability to dispose of hazardous solid waste impurity salt or high disposal cost, affecting dust removal effect, etc.

Inactive Publication Date: 2017-12-12
WUHAN HAOPUNENG ENVIRONMENTAL PROTECTION EQUIP ENG
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Problems solved by technology

In terms of users, the wearing parts (membranes) are frequently replaced, and the average operation cost per ton of water is too high; 3) Evaporation method MVR method: the investment is too large, the general failure rate is high, and the operation cost is high due to the large amount of power consumption. Hazardous solid waste impurity salts cannot be disposed of or the cost of disposal is extremely high
4) Direct flue spraying method: damage the dust removal equipment, affect the dust removal effect and produce dangerous solid waste impurity salt that cannot be disposed of or the disposal cost is extremely high
5) High-temperature flue gas spray drying method: It is greatly affected by restrictive factors such as flue gas volume flue gas temperature fluctuations, and at the same time produces dangerous solid waste impurities and salts that cannot be disposed of or the disposal cost is extremely high

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  • Desulfurization wastewater zero discharging process with carbon dioxide method

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] Such as figure 1 As shown, a zero-discharge process for desulfurization wastewater using the carbon dioxide method includes the following steps:

[0026] 1) Collection of desulfurization wastewater

[0027] 2) pH primary reaction

[0028] Adjust the pH value to alkaline conditions by adding lime, thereby precipitating magnesium ions, fluoride ions, sulfate ions, heavy metal ions and reducing sulfides;

[0029] Among them, the ion reaction formula: as follows

[0030] X+M+MOH-=X(OH)M

[0031] The purpose of this step is to improve the purity of the product obtained in the carbon dioxide ...

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Abstract

The invention provides a desulfurization wastewater zero discharging process with a carbon dioxide method. The process comprises the following steps: collecting desulfurization wastewater; performing a pH primary reaction; adjusting the pH value to an alkaline condition by adding lime, so as to precipitate magnesium ions, fluoride ions, sulfate ions and heavy metal ions; finally, enabling chlorine ions and ammonia gas to react through an organic substance catalytic reaction, so as to obtain an ammonium chloride product. According to the process, the problem that the wastewater cannot be recycled as the desulfurization wastewater is high in the content of chlorine ions is solved.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a zero-discharge process for desulfurization wastewater using a carbon dioxide method. Background technique [0002] At present, there are several methods for the zero discharge treatment technology of desulfurization wastewater: 1) pretreatment softening: currently using double alkali method, etc., the problem is that the hardness of desulfurization wastewater is extremely high (greater than 10000 mg per liter); 2) membrane concentration reduction: due to No matter what kind of membrane is used, the principle of molecular sieve is adopted. Based on this principle, the life of the membrane will not be too long under this high pollution condition. At present, this kind of membrane material cannot be well localized, and the price is relatively expensive. It will consume a large amount of unnecessary foreign exchange reserves of our country. In terms of users, the wearing parts (me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00C01C1/16
CPCY02P20/584C01F11/18C01C1/164
Inventor 赵义峰
Owner WUHAN HAOPUNENG ENVIRONMENTAL PROTECTION EQUIP ENG
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