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Treatment method for circulating water

A treatment method and technology of circulating water, applied in the direction of centrifugal separation of water/sewage treatment, etc., to achieve the effect of wide applicability, high reliability and simple process

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantage that each method is only effective for specific impurities in the circulating water treatment method in the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The circulating water system of a refinery is leaking from the production equipment, and the circulating water contains oil. The oil content, turbidity and CODcr before treatment are shown in Table 1. The hydrocyclone used is the fx25 hydrocyclone produced by Weihai Qingsong Cyclone Co., Ltd. The inlet pressure of the cyclone is 0.30Mpa, and the flow rate is about 1.5m / s. The water quality after treatment is shown in Table 1. The treated circulating water contains oil Quantity, turbidity and CODcr were reduced to 11mg / L, 7NTU and 47mg / L respectively, meeting the operation requirements of circulating water.

[0021] Among them, the determination method of oil content refers to the Chinese national standard GB / T16488-1996: Determination of water quality, petroleum, animal and vegetable oils by infrared photometry.

[0022] The measurement method of turbidity refers to the Chinese national standard GB / T 15893.1-1995: Determination of turbidity in industrial circulating coo...

Embodiment 2

[0027] Due to the failure of microbial control in a chemical plant, the circulating water contains a large amount of biological slime. The biological slime content, turbidity and CODcr before treatment are shown in Table 2. Adopt this method to process, cyclone pressure 0.35Mpa, flow velocity is 1.8m / s, the water quality after treatment is shown in Table 2, and the circulating water turbidity after treatment, biological slime and CODcr are respectively reduced to 7NTU, 8mg / L and 51mg / L, meeting the requirements for circulating water operation.

[0028] The determination method of biological slime content is GB 11901-1989: Gravimetric method for the determination of suspended solids in water.

[0029] The assay method of turbidity and CODcr is identical with embodiment 1.

[0030] Table 2

[0031] serial number

Embodiment 3

[0033] The main pollutants in the circulating water of steelmaking in a steel plant are iron oxides. The suspended solids content, turbidity and CODcr before its treatment are shown in Table 3. The pressure of the cyclone is 0.35Mpa, the flow rate is 2.5m / s, and the water quality after treatment is shown in Table 3.

[0034] Among them, the determination method of suspended solids content is: GB 11901-1989: Gravimetric method for determination of suspended solids in water.

[0035] The assay method of turbidity and CODcr is identical with embodiment 1.

[0036] table 3

[0037] serial number

[0038] 1

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PUM

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Abstract

The invention relates to a treatment method for circulating water. The method comprises cyclone separation of the circulating water in order to separate water and substances with density of less than or equal to that of the water. According to the treatment method for the circulating water, water purification can be realized, and the method has good effect on impurities of multiple types such as petroleum media, biological sticky mud and oxides; and the method provided by the invention has wide applicability, simple process, high reliability and high operability.

Description

technical field [0001] The invention relates to a treatment method for circulating water. Background technique [0002] As an important means to improve the utilization rate of water resources, the recycling of industrial cooling water has been widely used for a long time. In daily operation, the turbidity of circulating cooling water will increase continuously due to factors such as air dust entering, scale formed, iron oxide produced by corrosion, biological slime produced by microbial metabolism, and process medium leakage, which will lead to gradual deterioration of water quality. The turbidity gradually increases, which accelerates equipment corrosion and scaling. [0003] In order to solve a series of problems caused by the increased turbidity of circulating cooling water, a sand filter is usually installed on the system pipeline to continuously filter the circulating water accounting for 5%-10% of the total circulating water, so as to control the turbidity of circula...

Claims

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Application Information

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IPC IPC(8): C02F1/38
Inventor 李本高杜鹤谭丽
Owner CHINA PETROLEUM & CHEM CORP