Ultrasonic sterilizing and algae removing method for industrial circulating cooling water system

A technology of circulating cooling water and ultrasound, applied in the direction of sterilization/microdynamic water/sewage treatment, mechanical oscillation water/sewage treatment, etc., can solve the problems of high power and energy consumption for sterilization, and achieve easy implementation and low energy consumption. The effect of low consumption and simple operation

Inactive Publication Date: 2010-09-01
NANJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The low-frequency method can work for a longer distance, but requires a higher power for sterilization, which will generate greater energy consumption

Method used

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  • Ultrasonic sterilizing and algae removing method for industrial circulating cooling water system
  • Ultrasonic sterilizing and algae removing method for industrial circulating cooling water system
  • Ultrasonic sterilizing and algae removing method for industrial circulating cooling water system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The industrial circulating cooling water is irradiated for 5 minutes, 10 minutes and 15 minutes through the mixing frequency ultrasonic irradiation device, in which the ultrasonic irradiation device adopts figure 1 The inner diameter of the circulating cooling water pipe is 0.5m, 6 high and low frequency ultrasonic transducers (Wuxi Huaneng Ultrasonic Electronics Co., Ltd.) are alternately and evenly distributed on the outer wall of the pipe, and the flow rate of the circulating water body is 0.01m 3 / min, the ultrasonic frequency used is 20kHz and 1MHz mixed-frequency ultrasonic, and the high-frequency ultrasonic sound intensity is 0.01W cm -2 , the low-frequency ultrasonic sound intensity is 0.9W·cm -2 , and then make a series of dilutions of the irradiated circulating cooling water sample with physiological saline, and then place it in a constant temperature incubator for 36 hours (37° C.), and measure the number of surviving bacteria by plate colony counting method....

Embodiment 2

[0029] The test method and ultrasonic irradiation device adopted are the same as those in Example 1, the ultrasonic frequencies used are 20kHz and 5MHz mixed-frequency ultrasonic, and the high-frequency ultrasonic sound intensity is 0.03W cm -2 , the sound intensity of low-frequency ultrasound is 1W·cm -2 . The results are shown in Table 2.

[0030] Table 2

[0031]

Embodiment 3

[0033] The test method is the same as in Example 1, and the ultrasonic irradiation device adopts figure 2 form, in which the length and width of the reservoir are 1m, the height is 0.5m, and the water flow rate is 0.03m 3 / min, 8 ultrasonic transducers (Wuxi Huaneng Ultrasonic Electronics Co., Ltd.) are evenly divided into 2 layers (the distribution of the upper and lower layers is the same), and the high and low frequency ultrasonic transducers are alternately and evenly distributed in the circulating water body. The ultrasonic frequency used 40kHz and 5MHz mixed frequency ultrasonic, high frequency ultrasonic sound intensity is 0.07W·cm -2 , the low-frequency ultrasonic sound intensity is 1.2W·cm -2 . The results are shown in Table 3.

[0034] table 3

[0035]

[0036] As can be seen from Tables 1 to 3, the present invention uses frequency-mixing ultrasound for the purification of industrial circulating cooling water systems, which can effectively reduce the content ...

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Abstract

The invention relates to an ultrasonic sterilizing and algae removing method for an industrial circulating cooling water system. The method is characterized by arranging a frequency mixing ultrasonic irradiation device on the outer wall of a circulating water conveying pipeline or immersing the frequency mixing ultrasonic irradiation device in a water storage tank and irradiating the industrial circulating cooling water to obtain the circulating cooling water which is subjected to sterilization and algae removal, wherein the frequency mixing ultrasonic irradiation device consists of a high frequency ultrasonic generator, a low frequency ultrasonic generator and ultrasonic transducers. The method provided by the invention can strengthen the single frequency ultrasonic sterilizing effect, can effectively inhibit the growth of fungus and algae in the system without germicide, has good effects of sterilizing and removing algae, has simple and easy operation, reduces the treatment energy consumption and is green and environment-friendly.

Description

technical field [0001] The invention provides an ultrasonic sterilization and algae removal method for industrial circulating cooling water systems, in particular to a method of using mixed-frequency ultrasound for the purification of industrial circulating cooling water systems. Mixed-frequency ultrasonic includes all low-frequency ultrasonic Combination with high frequency ultrasound. Background technique [0002] Irradiation, or radiation technology, refers to a sterilization and algae killing technology (also known as biocidal technology) that uses electromagnetic rays and accelerated electrons to irradiate materials to kill biological cells and microorganisms. Irradiation for killing can be divided into two categories: one is ionizing radiation, such as gamma rays and accelerated electrons; the other is non-ionizing radiation, such as ultraviolet, infrared, microwave and ultrasonic waves. [0003] Ultrasonic irradiation can cause damage to microbial cell substances, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/36C02F1/50
Inventor 吕效平张帆韩萍芳
Owner NANJING UNIV OF TECH
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