JPS5877581A - Method of preventing corrosion of metal using microorganism - Google Patents

Abstract

PURPOSE:To effectively prevent corrosion of the metallic surface of an apparatus, by adding a suitable amount of a microorganism to water existing in the apparatus. CONSTITUTION:Microorganisms are cultivated from kerosene tank drain water and ethanol as carbon source. As the microorganisms, yeast of a saccharomyces genus and candida genus growing well in this cultivating field and bacterium of a Pseudomonas genus, Bacillus genus, Aerobactor genus, Corynebacterium, etc. are used. When these microorganisms of about 1X10<6>-1X10<9> unit cell/ml are added to water in the apparatus, the microorganisms are cultivated and consume oxygen and pH is varied. Thus the corrosion of the metallic surface of the apparatus is effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing the breast of a gold bird from being eaten using biological organisms Vf and Wi.
IA, 'i10; Is it possible to use biological organisms to prevent r? - I'd like to know how to do it.

Conventionally, divine methods have been proposed as a method for preventing corrosion in equipment where water is present. For example, amine additives are added to water to form a film on the metal surface of equipment to cut off contact with oxygen and prevent corrosion, and metal surfaces are coated with Teflon or glass lined. One meal of deer! There is a method of fixing 7j, and a method of using a material that is hard to corrode, such as stainless steel. However, all of these methods have disadvantages such as high cost and pollution, and are not satisfactory.

The present invention overcomes these disadvantages and provides a method for preventing corrosion of metals.

The present invention provides a method for preventing corrosion of metal using microorganisms, which is characterized by adding a small amount of 1A to the water existing in the soil apparatus to prevent corrosion of the metal surface of the apparatus that comes into contact with melted water. It is.

In the present invention, water existing in the apparatus includes tank drain water, industrial water (including seawater), and excludes drinking water and water at high or low temperatures where microorganisms cannot grow.

In addition, the microorganisms added to the water may be those that can be expected to grow well; for example,
Yeasts such as Kikindida, Pseudomonas, Bacillus, Aerobacter.

Examples include bacteria such as the genus Corynebacterium, and it is practically desirable to use activated sludge.

These microorganisms are I X I D' ~ I X
Add at a ratio of about 10' cell Al. Also, if necessary? Nutrient substances useful for the growth of R organisms can also be added as appropriate.

When microorganisms are added to water in this way, the microorganisms multiply, resulting in a decrease in oxygen and a change in H.
Disruption of metal surfaces by biological metabolites,
CJ effectively prevents corrosion of the metal surface of device a that is in contact with water on the mountain. In addition, like irrigation water, the equipment should be flowed through the system via a conveyor belt, pump, etc. 1. t'', necessary 1・1
7. Then install the filter mechanism to an appropriate position of 11″7.
1 z (';)'&Biological Ruisu,・shi・betsul〜te1−
It is preferable to remove 1 clog etc. from 1i-7I.

The present invention is in water!・By the extremely simple means of adding 1.i amount of microorganisms, Iff! of metals can be obtained. , Food 6 Prevention 11・
, corrosion of harmful chemicals etc. 11h +t
A sufficient effect can be achieved without using -, rτ11, etc.

Therefore, the present invention can be widely applied not only to the petroleum refining field but also to various yuzu manufacturing industries.

Example 1 Add 401'l of industrial phase water to a glass bottle.Me and 11
(?Pour 3g of watered activated sludge (89% moisture) into this.
Insert 10 sheets (50 x 211em) and 17 cotton plugs. Place this glass bottle in a thermostat at 30"C and leave it for 50 days.
did. Thereafter, the test piece was taken out, and after removing surface rust, the loss of test heath was measured. j Seishi degree r
j-, 123w〆tit・year. For comparison, an experiment was conducted under the same conditions without adding activated sludge, and the corrosion U' was 86.2 cm/cm/year.

Example 2 In a glass bottle with a capacity of 400 TR14, kerosene tank drain water and ethanol were used as carbon sources. Then test heather (SS-41, 10X50X0.
5n++n) were placed in a crow pin, covered with a cotton plug, and placed in a constant temperature bath at 5°C. After 50 days, the test pieces were taken out (~, after removing the surface rust, they were weighed to determine the weight loss of the test pieces. The corrosion rate was 1145 tuna/Ca/year.

On the other hand, for comparison, an experiment was conducted under the same conditions without adding yeast, and the degree of corrosion was 92.6/call・
It was the year.

Patent applicant: Idemitsu Kosan Co., Ltd. 8- 4-

Claims (1)

[Claims] IIMi corrosion of the metal surface of the device that comes into contact with the melted water by adding imitative biodegradation l to the water existing in the device a (J1 Stop 2)
A method for preventing corrosion of metal using a sushi organism.