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Desulfurization waste water bipolar membrane electrodialysis treatment method and device

A bipolar membrane electrodialysis, desulfurization wastewater technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve the waste of resources, pollution of the environment, cost of chemicals High problems, to achieve the effect of reducing the cost of pharmaceuticals, avoiding the blockage of the membrane, and not wasting resources

Active Publication Date: 2016-01-20
BEIJING GUODIAN FUTONG SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that when desulfurization wastewater is pretreated in the prior art, the amount of pretreatment medicament added is large, resulting in high medicament cost, and incomplete removal of metal ions (Ca or Mg, etc.), resulting in subsequent solid material components Complex, unable to recycle, waste resources, pollute the environment, and at the same time, cannot make full use of the products in the desulfurization wastewater treatment process, to achieve the dual considerations of resources and economy, and then provide a desulfurization wastewater electrodialysis treatment method and device

Method used

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  • Desulfurization waste water bipolar membrane electrodialysis treatment method and device

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Embodiment 1

[0036] Embodiment 1, desulfurization wastewater electrodialysis treatment method:

[0037] according to figure 1 The process flow chart in the process is to carry out bipolar membrane electrodialysis treatment of desulfurization wastewater, and the specific steps are as follows:

[0038] 1) Perform three-stage reaction treatment on the desulfurization wastewater: transport the desulfurization wastewater to the primary reaction pool, and add a sodium hydroxide dosing agent (that is, sodium hydroxide aqueous solution, from the subsequent steps, to the primary reaction pool) into the primary reaction pool. Dosing from the outside, after the process is stabilized, there is no need to add from the outside) until the pH value of the wastewater in the primary reaction tank is 11, react at 20°C for 1 hour, and remove the magnesium ions and some heavy metals in the desulfurization wastewater , so that the magnesium ion content is lower than 20mg / L;

[0039] 2) Transfer the supernatan...

Embodiment 2

[0044] Embodiment 2, desulfurization wastewater bipolar membrane electrodialysis treatment method:

[0045] according to figure 1 The process flow chart in the process is to carry out bipolar membrane electrodialysis treatment of desulfurization wastewater, and the specific steps are as follows:

[0046] 1) Perform three-stage reaction treatment on the desulfurization wastewater: transport the desulfurization wastewater to the primary reaction pool, and add a sodium hydroxide dosing agent (that is, sodium hydroxide aqueous solution, from the subsequent step) to the primary reaction pool. The pH value of the wastewater in the primary reaction tank is 12, react at 50°C for 0.5h, remove magnesium ions and some heavy metals in the desulfurization wastewater, and make the magnesium ion content lower than 20mg / L;

[0047] 2) Transfer the supernatant after the reaction in the primary reaction tank to the secondary reaction tank (which contains the subsequent nanofiltration concentra...

Embodiment 3

[0052] Embodiment 3, a kind of device of desulfurization wastewater electrodialysis treatment method:

[0053] A device for the electrodialysis treatment method of desulfurization wastewater, comprising a primary reaction tank, a secondary reaction tank, a tertiary reaction tank, an ultrafiltration device, a nanofiltration device and a bipolar membrane electrodialysis device connected in sequence, the nanofiltration device It communicates with the secondary reaction cell, and the bipolar membrane electrodialysis device communicates with the primary reaction cell;

[0054] A feeding port for calcium hydroxide is provided on the secondary reaction tank;

[0055] The tertiary reaction pool is provided with CO 2 vents.

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Abstract

The invention discloses a desulfurization waste water bipolar membrane electrodialysis treatment method and device. The method comprises the steps of 1, conducting first-order, second-order and third-order reaction treatment on desulfurization waste water, and obtaining supernate through separation; 2, conducting ultrafiltration and nanofiltration on the supernate in sequence to obtain nanofiltration concentrated water and nanofiltration via liquid, wherein the nanofiltration concentrated water is added to second-order reaction treatment; 3, conducting bipolar membrane electrodialysis on the nanofiltration via liquid to obtain sodium hydroxide and hydrochloric acid, wherein part of sodium hydroxide is circulated to primary reaction treatment. The device comprises a first-order reaction tank, a second-order reaction tank and a third-order reaction tank which are connected in sequence, an ultrafiltration device, a nanofiltration device and a bipolar membrane electrodialysis device, wherein the nanofiltration device is communicated with the second-order reaction tank, and the bipolar membrane electrodialysis device is communicated with the first-order reaction tank. Calcium hydroxide is added and self produced sodium hydroxide and sodium sulfate are utilized to remove calcium and magnesium, so that follow-up material compositions are simple, recover is easy, resource waste is avoided, and environment pollution is avoided.

Description

technical field [0001] The invention belongs to the field of desulfurization wastewater treatment, and in particular relates to a bipolar membrane electrodialysis treatment method and device for desulfurization wastewater. Background technique [0002] At present, with the improvement of national discharge standards, zero-discharge treatment of desulfurization wastewater is gradually implemented. The existing desulfurization wastewater process generally includes softening pretreatments such as neutralization, precipitation, coagulation, final neutralization, and mud dehydration treatment (adding drugs to coagulate and clarify the desulfurization wastewater, removing most of the hardness, alkalinity, and suspended matter; softening the effluent into the filtration system to further remove suspended solids; the sludge produced by chemical reactions enters the dehydration system for desliming), membrane concentration treatment (using various types of membranes to perform concen...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/469C02F1/52C02F1/44
Inventor 滕济林樊兆世杨万强胡溪李若征丁绍峰靳昕赵崇
Owner BEIJING GUODIAN FUTONG SCI & TECH DEV
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