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Circulating water treatment method adopting deionized water as supplement water

A treatment method, deionized water technology, applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of ineffective control of corrosion, water eutrophication, chlorine The failure of similar fungicides and other problems, to achieve the effect of controlling corrosion and microbial growth

Inactive Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that because of the presence of dissolved oxygen in the water, the corrosion cannot be effectively controlled by adjusting the pH alone.
Its disadvantages are: chlorine fungicides will fail under alkaline conditions, and phosphorus-containing substances such as organic phosphorus and sodium hexametaphosphate will cause eutrophication of water if they are discharged with sewage

Method used

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  • Circulating water treatment method adopting deionized water as supplement water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 180.0g thiourea, dissolve it with deionized water, and settle to 500mL to prepare the corrosion inhibitor of the present invention.

[0038] The corrosion inhibitor of this example and deionized water were subjected to a rotary plate test. The effective dosage concentration of thiourea in the water was 180 mg / L, and the pH value was controlled at 10.5 with sodium hydroxide. After running for 72 hours under the condition of 75r / min, the measured corrosion rate is 0.0331mm / a.

Embodiment 2

[0040] Weigh 100.0g of diphenylthiourea and dissolve it with a small amount of alcohol, then make it up to 500mL with deionized water to prepare the corrosion inhibitor of the present invention.

[0041] The corrosion inhibitor of this example and deionized water were subjected to a rotary plate test. The effective dosage concentration of diphenylthiourea in the water was 100mg / L, and the pH value was controlled at 11.2 with sodium hydroxide. At a temperature of 45°C, The measured corrosion rate was 0.0324mm / a after running for 72h at a rotational speed of 75r / min.

Embodiment 3

[0043] Take by weighing 140.0g allyl thiourea, first dissolve with a small amount of alcohol, and then use deionized water to make the volume to 500mL to prepare the corrosion inhibitor of the present invention.

[0044] The corrosion inhibitor of this example and deionized water were subjected to a rotary plate test. The effective dosage concentration of allylthiourea in water was 140 mg / L, and the pH value was controlled at 10.0 with sodium carbonate. At a temperature of 45°C, The corrosion rate was measured to be 0.0338mm / a after running for 72h at a rotational speed of 75r / min.

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Abstract

The invention relates to a circulating water treatment method adopting deionized water as supplement water. The method comprises a) controlling pH of circulating water at 9-11.5; b) adding an adsorption film type corrosion inhibitor, wherein the adsorption film type corrosion inhibitor is selected from thiourea and its derivative and a nitrogen-containing heterocyclic compound; and c) adding an environment-friendly type bactericide, wherein the environment-friendly type bactericide is hydrogen peroxide and ozone. The inventive circulating water treatment method is suitable for treatment of a circulating cooling water system with sewage subjected to secondary treatment firstly and then to double membrane process so as to serve as supplement water, and can effectively control corrosion and microorganism growth.

Description

technical field [0001] The invention relates to a circulating water treatment method, in particular to a circulating water treatment method using deionized water as supplementary water. Background technique [0002] As we all know, in petrochemical, thermal power generation, metallurgy and other industries, a large amount of water is needed, of which cooling water accounts for a large proportion. For example, cooling water in petrochemical enterprises accounts for more than 80% of production water. Nowadays, water resources are scarce, and saving water has become the theme of the world. Reuse of sewage and reclaimed water for circulating water will greatly reduce the consumption of fresh water, and even achieve zero replenishment of fresh water. [0003] In the 1960s, the United States realized the reuse of discharged urban sewage for power generation circulating water system, and in the 1990s, it realized the reuse of industrial sewage and the circulating water system of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/78C02F1/72C02F1/50
Inventor 傅迎春华炜楼琼慧周学勤郦和生秦会敏
Owner CHINA PETROLEUM & CHEM CORP