Treatment method and treatment system for desulfurization wastewater

A desulfurization wastewater treatment method technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve high investment and operation costs, solid salt secondary pollution, water recovery Low efficiency and other problems, to achieve the effects of reducing investment and operating costs, high recovery rate of product water, and reducing drug consumption

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

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to provide a kind of desulfurization wastewater desulfurization wastewater in order to overcome the common defects in the existing coal-fired power plant desulfurization wastewater zero discharge process, such as complex process, high investment and operation costs, low water recovery rate and secondary pollution caused by solid salts. Processing method and processing system

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

Examples

Experimental program
Comparison scheme
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Embodiment 1

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

[0100] The softening pretreatment unit that uses in the present embodiment comprises 2 volumes and is 30m 3 The softening tank; the nanofiltration separation unit is a first-stage nanofiltration system consisting of 2 membrane shells and 24 GE DSL NF8040 nanofiltration membrane elements connected in series; the room temperature crystallization unit includes a volume of 10m 3 The stainless steel container and centrifugal separation device; the reverse osmosis separation unit is a one-stage reverse osmosis system consisting of a single membrane shell and six DOW BW30FR-400 reverse osmosis membrane elements connected in series; the electrodialysis separation unit includes a The total membrane area is 80m 2 The electrodialysis membrane stack and the corresponding auxiliary system; the crystallization separation unit includes a forced circul...

Embodiment 2

[0116] combine figure 2 , this embodiment is used to illustrate the treatment method of desalination wastewater of the present invention.

[0117] The treatment system of the desulfurization waste water of this embodiment is the same as that of Embodiment 1, and the influent flow rate of raw water is 20m 3 / h, the specific process is as follows:

[0118] (1) Set the flow rate described in Table 2 as 20m 3 / h, the synthetic brine with a total mass fraction of 3% of salt is supplied to the softening pretreatment unit for softening pretreatment, wherein the softening pretreatment method includes: introducing the synthetic brine into the first softening tank, adding the synthetic brine to the synthetic brine Joining flow is 2.5m 3 The calcium hydroxide solution (pH is adjusted to 11.1) of the 10 weight % of / h, left standstill clarification 60 minutes after reacting for 40 minutes; Then add the flocculant polyferric chloride of the organic sulfur TMT15 of 60mg / L, 18mg / L and 1...

Embodiment 3

[0131] combine figure 1 , this embodiment is used to illustrate the treatment method of desalination wastewater of the present invention.

[0132] The treatment system of the desulfurization waste water of this embodiment is the same as that of Embodiment 1, and the influent flow rate of raw water is 20m 3 / h, the specific process is as follows:

[0133] (1) Set the flow rate described in Table 3 as 20m 3 / h, the synthetic brine containing 1.8% of the total mass fraction of salt is supplied to the softening pretreatment unit for softening pretreatment, wherein the method of softening pretreatment includes: introducing the synthetic brine into the first softening tank, adding the synthetic brine to the synthetic brine The joining flow is 0.45m 3 10% by weight of calcium hydroxide solution (pH is adjusted to 11.3) per h, after reacting for 45 minutes, let it stand for clarification for 50 minutes; then add the flocculant polyaluminum sulfate of organic sulfur TMT-15, 20mg / L o...

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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 method comprises the following steps: (1) subjecting desulfurization wastewater to softening pretreatment so as to obtain softened effluent and sludge; (2) with the softened effluent as inlet water for nanofiltration, carrying out nanofiltration and separation so as to obtain nanofiltration produced water rich in monovalent salts and nanofiltration concentrated water in which divalent salts are concentrated, and subjecting the nanofiltration concentrated water to normal-temperature crystallization treatment so as to obtain the divalent salts and crystallized effluent; (3) subjecting the nanofiltration produced water to reverse osmosis and electrodialysis coupled treatment so as to obtain electrodialyzed concentrated water and reverse osmosis produced water; and (4) subjecting the electrolyzed concentrated water to crystallization and separation so as to obtain the monovalent salts. The method of the invention is greatly reduced in chemical consumption, substantially saves cost, realizes the separation of the salts and the resourceful utilization of hardness in the system, meets the demands of fluctuating water qualities of the desulfurization wastewater, has high water recovery rate, and satisfies the requirement of zero emission.

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] Coal-fired power plants are the main form of energy power plants in my country, SO in the flue gas of coal-fired power plants 2 In my country, limestone-gypsum wet desulfurization technology is mainly used for treatment. This technology will produce a large amount of desulfurization wastewater. The composition of desulfurization wastewater is complex and has the characteristics of high suspended solids, high COD, high salt, and high hardness. It is a coal-fired power plant. One of the last waste water. [0003] The control of desulfurization wastewater drainage is to ensure the quality of gypsum and control the corrosion of equipment such as the enrichment of chloride ions in the desulfurization tower. The control point is generally that the concentration of chloride ions rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F1/441C02F1/444C02F1/4693C02F5/00C02F9/00
Inventor 李小端钟振成熊日华霍卫东程子洪张微尘李国涛仝胜禄龙银花李永龙卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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