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Power plant circulating cooling water waste water treatment method and system

A technology for wastewater treatment system and circulating cooling water, which is applied in the fields of water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can improve the recycling rate and application range, reduce the content of sulfate radicals, and reduce the content of high-value salts.

Inactive Publication Date: 2018-06-26
武汉天空蓝环保科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the huge demand, the use of reclaimed water from urban sewage treatment plants that has undergone secondary treatment is currently being vigorously promoted as source water and supplementary water for circulating cooling water in thermal power plants. Compared with groundwater or river water, the water quality of this water is poor, and the main pollution Factors are sulfate, hardness substances and salt. After recycling, the concentration of each pollution factor increases significantly. Among them, the concentration of sulfate is often as high as 2000-3000mg / L, which cannot continue to be recycled, and the wastewater must be comprehensively treated.
The traditional treatment process of circulating cooling wastewater is relatively simple. With the help of simple physical and chemical methods, it is only effective for suspended particles and hardness substances in wastewater. The overall quality of wastewater has not improved much, and sulfate and other salt ions in wastewater cannot be effectively removed. , so that the scope of use of the treated wastewater is greatly limited, and it can only be used in production links that do not require high water quality. The recycling rate is severely limited, resulting in a large waste of water resources.
[0005] The traditional treatment process of sulfate is mainly calcium salt and barium salt. The principle of the two is the same, that is, the sulfate is removed by combining with sulfate to form insoluble matter. However, in the calcium salt method, due to the high solubility of calcium sulfate, the sulfate The removal rate is low, and the barium salt method has the problem of high cost, so the two methods are not practical

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  • Power plant circulating cooling water waste water treatment method and system

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Embodiment 1

[0028] Such as figure 1 , the embodiment of the present invention provides a kind of power plant circulating cooling water wastewater treatment method, comprising:

[0029] Step 1, adding sodium aluminate and calcium-containing substances to the wastewater, so that the sodium aluminate, the calcium-containing substances and the sulfate in the wastewater undergo a complex reaction to form a complex sulfate precipitate, wherein the The calcium-containing substance is calcium oxide or calcium hydroxide; in the present embodiment, the sodium aluminate and the calcium-containing substance added are preferably solution properties, and the calcium-containing substance is preferably calcium hydroxide solution; wherein, complexing The reaction can be represented by the following formula:

[0030] SO 4 2- +Ca 2+ +AlO 2 - +OH - →3CaO·Al 2 o 3 · 3CaSO 4 ↓(ettringite)

[0031] In step 2, the clear liquid obtained from the complexation reaction in step 1 is processed by pre-stage...

Embodiment 2

[0041] Such as figure 1 The embodiment of the present invention relates to a wastewater treatment system for circulating cooling water in a power plant, which includes a complexation reaction tank 2, a pre-stage membrane filter mechanism 3, an aeration reaction tank 4, a rear-stage membrane filter mechanism 6 and Clear water collection tank 7, wherein, the waste water inlet of described aeration reaction tank 4 is communicated with the fresh water outlet of described pre-stage membrane filter mechanism 3, and described clear water collection tank 7 is communicated with the fresh water outlet of described rear stage membrane filter mechanism 6 ; The complexation reaction tank 2 is provided with an agitator 201, and the aeration reaction tank 4 is provided with an aeration device 401.

[0042] The above-mentioned complexation reaction pool 2 is connected with a sodium aluminate adding mechanism and a calcium-containing substance adding mechanism, which facilitates adding sodium ...

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Abstract

The invention relates to a power plant circulating cooling water waste water treatment method and system, the method comprises the steps that sodium aluminate and a calcareous material are added to waste water, and the sodium aluminate and the calcareous material are in complexation with sulfate radicals in the waste water to produce sulfate precipitate; the clear liquid obtained through complexation is subjected to former stage film filtration treatment; the fresh water obtained after former stage film filtration treatment is subjected to aeration treatment, and calcium ions and aluminium ions dissolved in the fresh water are promoted to form calcium carbonate precipitate and aluminium hydroxide precipitate respectively; the fresh water obtained after aeration treatment is subjected to later stage film filtration treatment, and at least residual sulfate radicals are retained. According to the power plant circulating cooling water waste water treatment method and system, a manner of combining the chemical reaction and the physical action is adopted, the high concentration sulfate radicals in the circulating cooling water waste water can be selectively removed, the content of the sulfate radicals in the circulating cooling water waste water is effectively reduced, and the method and the system have the advantages of high efficiency and high pertinency; the quality of the treatedwaste water is excellent, the waste water can be reused in a plurality of links of the production technology, and the reuse rate of the circulating cooling water is improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for treating wastewater of circulating cooling water in a power plant and a system for treating wastewater of circulating cooling water in a power plant. Background technique [0002] Coal-fired thermal power plants are large water users. According to incomplete statistics, the daily water consumption of a large thermal power plant with an installed capacity of 1,000 MW is about 100,000 tons, which is equivalent to the daily water consumption of a small city. In areas where water resources are extremely scarce such as Northwest my country, such a large amount of water consumption not only seriously threatens the local ecological environment protection, but also restricts the comprehensive development of the local cities. Therefore, how to save water, improve the utilization rate of water resources and regenerate The efficiency has become the k...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/02
CPCC02F1/44C02F1/442C02F1/444C02F1/5236C02F1/58C02F9/00C02F2103/023C02F2301/08
Inventor 李志慧李湧安胜利张润伟
Owner 武汉天空蓝环保科技有限公司
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