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Zero-emission treatment technology of desulfurization waste water in thermal power station

A thermal power plant, desulfurization wastewater technology, applied in the direction of gaseous effluent wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the high cost of dosing, high treatment cost, increase the cost of ton water treatment, etc. question

Inactive Publication Date: 2017-10-17
上拓环境科技(长兴)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above four desulfurization wastewater treatment process routes have their own advantages and disadvantages, but they all have the following problems: 1) The cost of pretreatment chemical softening and dosing is high. According to calculations, the cost of water softening chemical per ton is 20-30 yuan / m 3 Left and right; 2) It is difficult to guarantee the purity of crystallized salt after evaporation. When the purity is low, it can only be treated as solid waste (hazardous waste), which increases the cost of water treatment per ton; 3) The cost of evaporation and crystallization is high, and the consumption of steam and electricity is high. high processing cost

Method used

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  • Zero-emission treatment technology of desulfurization waste water in thermal power station

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Experimental program
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Embodiment 1

[0050] A zero-discharge treatment process for desulfurization wastewater from thermal power plants, comprising the following steps:

[0051] 1), send the wastewater into the reaction tank, and add Ca(OH) 2 To react, Ca(OH) 2 with F in wastewater - , SO 4 2- , Mg 2+ Reaction to form insoluble substances, remove F contained in wastewater - , some SO 4 2- and Mg 2+ , the reaction tank is equipped with mechanical stirring equipment and high-efficiency aeration equipment to improve the reaction efficiency of wastewater in the reaction tank;

[0052] 2), the wastewater treated in step 1) is sent to an electrochemical device for electrolysis to further remove Mg 2+ , reduce the NaCl and CODCr concentration in waste water, described electrochemical device comprises electrode, rectifier, cell body equipment and cable, and described electrode is to be the steel material containing iron, and electrochemical device outputs current along with rectifier during operation The rise o...

Embodiment 2

[0060] Such as figure 1 As shown, a zero-discharge treatment system for desulfurization wastewater from a thermal power plant includes:

[0061] Reaction tank, by adding Ca(OH) to the reaction tank 2 , and F in wastewater - , SO 4 2- , Mg 2+ The reaction forms insoluble substances, thereby removing the F contained in the wastewater - , some SO 4 2- and Mg 2+ , the reaction tank is equipped with mechanical stirring equipment and high-efficiency aeration equipment to improve the reaction efficiency of wastewater in the reaction tank;

[0062] Electrochemical device, the electrochemical device includes electrodes, rectifiers, cell equipment and cables, the electrodes are made of iron-containing steel, and the electrolytic treatment of the effluent of the reaction cell is further removed by the electrochemical device. 2+ , reduce NaCl and COD in wastewater Cr Concentration, the tiny bubbles produced can play an air flotation effect and improve the removal effect of suspe...

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Abstract

The invention discloses a zero-emission treatment technology of desulfurization waste water in thermal power station. The zero-emission treatment technology comprises the following steps: 1) reacting in a reaction tank; 2) conducting electrolysis treatment; 3) treating through high-efficiency precipitation integrated equipment; 4) treating through NO.1 electric driving membrane device to obtain SO4<2->-containing NO.1 diluted chamber liquor and Cl<->-containing NO.1 concentrated chamber liquor; 5) treating NO.1 diluted chamber liquor through a desulfurization island system; 6) treating NO.1 concentrated chamber liquor through a No.2 electric driving membrane device to obtain NO.2 concentrated chamber liquor and NO.2 diluted chamber liquor; 7) treating NO.2 concentrated chamber liquor through a No.4 electric driving membrane device to obtain NO.4 diluted chamber liquor and NO.4 concentrated chamber liquor; and 8) treating NO.2 diluted chamber liquor through a No.3 electric driving membrane device. By utilizing chemical reaction, electrochemical devices, high-efficiency precipitation integrated equipment, multivalence separation electric driving membrane, concentration electric driving membrane and a bipolar membrane combination technology, more than 90% of water in desulfurization waste water can be recycled, and gypsum can be produced by utilizing Na2SO4 and NaCl in the waste water, without the need of purchasing acid and alkali in treatment process.

Description

technical field [0001] The invention relates to the field of desulfurization wastewater treatment in thermal power plants, in particular to a zero-discharge treatment process for desulfurization wastewater in thermal power plants. Background technique [0002] At present, among various desulfurization methods in thermal power plants, boiler flue gas wet desulfurization accounts for an increasing proportion due to its high desulfurization efficiency, but the disadvantage of this process is that waste water is generated, and the pH value of waste water is 5-6 , and contains a large amount of suspended solids (gypsum particles, SO 2 , Al and iron hydroxide), fluoride and As, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Sn, Zn and other heavy metal elements, domestic power plants mostly use wet limestone-gypsum treatment process for desulfurization . The flue gas contains a small amount of F brought from raw coal - and Cl - and various impurities, which are washed down after entering the...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/18C02F101/10C02F101/14
CPCC02F9/00C02F5/02C02F2103/18C02F2101/10C02F2101/101C02F2101/14C02F1/58C02F1/583C02F1/461C02F1/463C02F1/465C02F1/4693C02F1/4672
Inventor 方毓淳吴泽鹏谈宾宾李文扬俞时智朱元红许莹莹
Owner 上拓环境科技(长兴)有限公司
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