Treatment method and treatment system for desulfurization wastewater

A desulfurization wastewater and treatment method technology, which is applied in the direction of gaseous effluent wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of high cost of chemicals, complicated operation, long process flow, etc., and achieve a small footprint , Improve the recovery rate and reduce the effect of project investment

Active Publication Date: 2018-10-09
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it follows that the process flow is long, the operation is complicated, and th

Method used

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  • Treatment method and treatment system for desulfurization wastewater
  • Treatment method and treatment system for desulfurization wastewater
  • Treatment method and treatment system for desulfurization wastewater

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Experimental program
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Embodiment 1

[0099] combine figure 1 , this embodiment is used to illustrate the treatment method of desulfurization wastewater of the present invention.

[0100] The softening clarification treatment unit that uses in the present embodiment comprises that volume is 15m 3 The reaction tank and volume is 20m 3 The clarification tank; the hardness control treatment unit is a hardness control reaction pool, including a volume of 20m 3 The reaction zone and volume is 20m 3 The settling area; the nanofiltration separation unit is a first-stage two-stage nanofiltration system consisting of 6 membrane shells and 4 GE DK 8040F30 nanofiltration membrane elements connected in series; the normal temperature crystallization unit includes a volume with an insulating layer 20.0m 3 The stainless steel container and centrifugal separation device; the first electrodialysis separation unit contains a total membrane area of ​​80m 2 The three-stage hydraulic series electrodialysis membrane stack and the ...

Embodiment 2

[0113] combine figure 2 , this embodiment is used to illustrate the treatment method of desulfurization wastewater of the present invention.

[0114] The treatment system of the desulfurization waste water of the present embodiment is the same as embodiment 1, and the specific technological process is as follows:

[0115] (1) Adding mass concentration in the power plant desulfurization wastewater shown in Table 2 of 22T / h in the reaction tank is 5% Ca(OH) 2 , adjust the pH of the wastewater to 11.1, and add 60mg / L organic sulfur TMT-15, 18mg / L flocculant polyferric chloride and 10mg / L coagulant polyacrylamide, react for 18min, and the reaction in the reaction tank The material was transported to the clarification tank for settlement for 60 minutes to obtain 22T / h softened and clarified effluent, wherein the concentration of magnesium ions in the softened and clarified effluent was 12.8 mg / L, and the molar ratio of calcium ions to sulfate was 128:13;

[0116] (2) Adding sulf...

Embodiment 3

[0127] combine figure 2 , this embodiment is used to illustrate the treatment method of desulfurization wastewater of the present invention.

[0128] The treatment system of the desulfurization waste water of the present embodiment is the same as embodiment 1, and the specific technological process is as follows:

[0129] (1) Adding mass concentration in the power plant desulfurization wastewater shown in Table 3 of 22T / h in the reaction tank is 5% Ca(OH) 2 , adjust the pH of the wastewater to 11.5, and add 50mg / L organic sulfur TMT-15, 20mg / L flocculant polyaluminum sulfate and 5mg / L coagulant polyacrylamide, react for 45min, and remove the reactants in the reaction tank Transport it to the clarification tank for 45 minutes to settle to obtain 22T / h softened and clarified effluent, wherein the concentration of magnesium ions in the softened and clarified effluent is 8.73mg / L, and the molar ratio of calcium ions to sulfate is 142:11;

[0130] (2) Adding sulfuric acid with a...

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Abstract

The invention discloses a treatment method and a treatment system for desulfurization wastewater, belonging to the field of industrial wastewater treatment. The treatment method comprises the following steps: (1) softening and clarifying desulfurization wastewater to obtain softened and clarified effluent; (2) adding acid into the softened and clarified effluent so as to obtain neutral softened and clarified effluent; (3) in the presence of calcium sulfate seed crystals, adding sodium sulfate into the neutral softened and clarified effluent for hardness regulation and control so as to obtain hardness-controlled effluent; (4) subjecting the hardness-controlled effluent to nanofiltration and separation so as to obtain nanofiltration produced water and nanofiltration concentrated water, and subjecting the nanofiltration concentrated water to normal-temperature crystallization treatment so as to obtain a divalent salt and normal-temperature crystallized effluent; and (5) subjecting the nanofiltration produced water to concentration so as to obtain concentrated water and produced water and subjecting the obtained concentrated water to crystallization and separation so as to obtain a monovalent salt. The method of the invention can significantly reduce operation cost, obviously improve the recovery rate of water, and overally reduce project investment, occupied land area and treatment cost.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment method and system for desulfurization wastewater. Background technique [0002] Limestone-gypsum wet flue gas desulfurization process is widely used at home and abroad. This process is a large-scale commercial application of desulfurization method in the world. The technology is very mature, the operation is relatively reliable, and the desulfurization efficiency is high. Good adaptability. A certain amount of waste water must be discharged regularly during desulfurization, one is to maintain the balance of substances in the slurry circulation system of the desulfurization device, and the other is to prevent the chlorine concentration in the flue gas from exceeding the specified value and ensure the quality of gypsum. Wastewater mainly comes from flushing water system and gypsum dehydration, etc. Desulfurization wastewater is generally acidic, with high...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/18
CPCC02F1/04C02F1/442C02F1/4693C02F1/5236C02F1/56C02F1/66C02F5/00C02F5/14C02F9/00C02F2103/18C02F2201/46115C02F2301/08
Inventor 程子洪钟振成熊日华霍卫东李国涛陈权张微尘李小端龙银花李永龙卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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