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Method for extinguishing alga in cooling water system

A cooling water system and cooling water technology, applied in chemical instruments and methods, sterilization/microdynamic water/sewage treatment, descaling and water softening, etc., to achieve the effect of low treatment cost and simple operation

Inactive Publication Date: 2004-09-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, so far, there is still no effective method for removing algae in cooling water systems
Although fungicides are often added to control the reproduction of microorganisms and algae during normal operation, when the fungicides are used improperly, they often cause a large number of algae to grow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This embodiment is an experiment on the killing effect of metal hydroxides on algae.

[0017] The algae killing effect is judged by visual inspection. The algae killing process is from dark green mass → light green → yellowish white → white → white powder.

[0018] The test algae in the embodiment is obtained by the following method: the fresh algae in the cold water pool of the circulating water system is taken out (the main components are blue-green algae and green algae), and it is suction-filtered for 20 minutes under a vacuum of 10 mmHg. Weigh 5 parts of treated algae with a balance, each weighing 0.05g, and put them into 250mL Erlenmeyer flasks numbered #1, #2, #3, #4 and #5 containing 100mL of distilled water, and immediately add different Shake it for 2 minutes after using the fungicide, and let it stand under the light. Regularly observe the changes on the surface of the algae and compare them. The results are shown in Table 1.

[0019] potion

Embodiment 2

[0021] This embodiment is an experiment on the killing effect of sodium hydroxide and quaternary ammonium salt fungicides on algae.

[0022] The experimental method is the same as in Example 1, and the experimental results are shown in Table 2.

[0023] "1227" Concentration

[0024] From the results in Table 2, it can be seen that 100mg / L "1227" or "1427" has no obvious killing effect on algae, but after being used in combination with sodium hydroxide, the killing effect on algae is significantly increased.

Embodiment 3

[0026] This embodiment is an experiment on the killing effect of sodium hydroxide and oxidative fungicides on algae.

[0027] Experimental method is with embodiment 1, and experimental result is as table 3

[0028] fungicide

[0029] As can be seen from the results in Table 3, the killing effect of 50 mg / L of chloroquine on algae is not obvious, and after being used in combination with sodium hydroxide, the killing effect on algae is significantly increased. Similarly, the killing effect of 100mg / L hydrogen peroxide on algae is not obvious. After being used in combination with sodium hydroxide, the killing effect on algae is significantly increased.

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PUM

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Abstract

The invention provides a process for eliminating algae in cooling water system comprising the steps of, filling bactericide and basic substance into cooling water, making the pH value to be 9-14, mixing one or more from Li2O, Na2O, K2O, LiOH, NaOH, KOH, Li2Co3, Na2Co3, K2Co3, LiHCo3, NaiHCo3, KHCo3, Na3PO4, K3PO4, sodium acetate and postassium acetate. While the bactericidal agent is a mixture two or more selected from chlorine, sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, dichloroisocyanuric acid, trichloroiminocyanuric acid, chlorine dioxide, bromine, sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, hydrogen dioxide solution, ozone, quaternaries, and glutaric dialdehyde.

Description

technical field [0001] The invention relates to a method for killing algae in a cooling water system, specifically, a method for stripping and removing algae in a cooling water system. technical background [0002] In the open circulating cooling water system, people can often see that the metal surface of the rows of tubes of the spray coil heat exchanger and the side walls of the distribution tank are covered with algae; the water surface in the distribution tank is floating Algal blooms; pools below cooling towers exposed to sunlight, resulting in green water surfaces due to algae blooms. Algae in cooling water mainly include cyanobacteria, green algae and diatoms. Algae grow by photosynthesis, so the wall of the cooling tower, the edge of the sump, and the water distributor and other places with sufficient sunlight and water are hotbeds for algae reproduction. [0003] Algae blooms not only affect the appearance of the cooling water system, dead algae can become sedime...

Claims

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Application Information

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IPC IPC(8): C02F1/50C02F1/66C02F5/00
Inventor 李本高李亚红王征
Owner CHINA PETROLEUM & CHEM CORP
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