JPH03123684A - Method for cleaning pipeline - Google Patents

Abstract

PURPOSE:To efficiently remove fur and org. gummy matter by injecting a washing solution obtained by compounding glucose and lactose with a mixture of seven kinds of microorganism groups in a pipeline having org. scale accumulated thereon and hermetically sealing the same in the pipeline. CONSTITUTION:A washing solution is prepared by compounding glucose, lactose, ammonium chloride, a surfactant and water with a microorganism mixture of seven genera of the genus Bacillus, the genus streptococcus, the genus Rhizopus, the genus Nitrosomonus, the genus Nitrobacter, the genus Pseudomonas and the genus Aspergirus. This washing solution is injected in a pipeline 1 and both ends of the pipeline 1 are sealed by rubber plugs 2 and the washing solution is allowed to stand as it is. By this method, the washing solution penetrates in the scale bonded to the inner wall of the pipeline 1 and the bonded scale can be decomposed and dissolved by the reaction with microorganisms.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pipeline cleaning method that utilizes microorganisms. That is, the present invention relates to a pipeline cleaning method that can efficiently remove organic substances and sources of bad odor when cleaning pipelines.

[Prior art and problems to be solved by the invention] Conventionally used pipeline cleaning methods include: (1) The plug itself is made of a wear-resistant material, and the pipe is cleaned by physical or mechanical grinding. Methods for removing scale adhering to the inner walls of pipelines: (1) The main method was to soften the scale adhering to the inner walls of pipelines in advance with acid or solvent, and then remove it by grinding with the plug.

Such technology has the following problems.

In other words, in the techniques (1) and (2) above, in (1), due to mechanical grinding, the inner wall of the pipeline is not scratched, and the scale is distributed from soft to hard, so it cannot be removed uniformly. I couldn't do it.

In addition, (even in the case of 211), if a solvent or acid is used in combination, it may cause partial corrosion of the inner wall of the pipeline, and at the same time, it may cause "foul odors originating from deposits on the inner wall of the pipeline" during work. May cause “harm to workers”.

Therefore, in the present invention, in order to solve the problem that has not been solved by the conventional technology, that is, the problem of the formation of organic scale that adheres to the inside of the pipeline over a long period of time, microorganisms are used to scratches on the inner wall,
To provide a method for cleaning a pipeline that can be cleaned without corroding the inner wall of the pipeline and is harmless to workers. Furthermore, it is an object of the present invention to provide an extremely effective pipeline cleaning method that can clean water scale, water moss, and organic gum-like substances, which have been considered difficult to clean in the past. . A further object of the present invention is to provide a cleaning method that can completely clean the inside of a pipeline by running a bullet-shaped or cylindrical pipeline cleaning plug made of polyurethane foam for cleaning.

[Means for Solving the Problems] The gist of the present invention is that Bacillus
S) genus, Streptococcus
us ), Rhizopus , Nido [1 Nitr.

somonas) fi, Nitrobacter (Nitro
Bacter genus, Pseudomonas
nas ) genus and Aspergillus ( Aspergill
A cleaning solution consisting of glucose, lactose, ammonium chloride, surfactant, and water is prepared in a mixture of microorganisms of 7 genera of the genus U.S., and this cleaning solution is injected in a sealed manner into a pipeline in which organic scale is deposited. The scale is left in contact for at least a minute and immersed in the scale attached to the inner wall of the pipeline to decompose, dissolve or peel it off, and then a porous resin pipeline cleaning plug is inserted into the pipeline using water pressure. This pipeline cleaning method is characterized in that organic scale is removed and cleaned from the inner wall of the pipeline by running the pipeline. The cleaning liquid contains 3 to 5 glucose per 10 microorganism groups.
000 parts by weight, lactose 3-5000 parts by weight, ammonium chloride 0.5-3000 parts by weight, surfactant 0.01-2
Preferably, the composition is composed of 0 parts by weight and 300 to 6,000,000 parts by weight of water.

According to the present invention, the pipeline cleaning method of the present invention using microorganisms first prepares a cleaning solution with a composition suitable for a specific microorganism mixture, its nutrients, and culture conditions, and then uses this cleaning solution to remove organic scales. It is injected in a sealed manner into a pipe twin with accumulated water and left in contact for 30 minutes or more, allowing it to easily impregnate and penetrate into the scale adhering to the inner wall of the pipeline, decomposing and dissolving the adhering scale through the reaction of microorganisms, and further , allowing for easy peeling, and then
A commercially available porous resin pipeline cleaning plug is inserted under pressure and moved through the pipeline using water pressure. Then, the organic squirrel, which has been decomposed and easily peeled off, can be easily peeled off from the inner wall of the pipeline and can be efficiently cleaned and removed.

Therefore, in the cleaning method according to the present invention, the cleaning plug is kept in the cleaning solution of the present invention for 30 minutes or more before running the cleaning plug. This is the time necessary for the microbial treatment according to the present invention, and organic scale, particularly gum-like substances, cannot be removed in less than 30 minutes.

Commercially available cleaning plugs are made of porous resin, preferably polyurethane foam or foamed rubber.

Therefore, the effect of keeping the pipeline clean for a long time remains even after treatment.

In the pipeline cleaning method of the present invention, conditions can be established under which a certain group of mixed microorganisms can efficiently exfoliate and remove organic scale under the best conditions.

The microorganisms to be included in the cleaning liquid of the present invention include (1) Bacillus genus, especially Bacillus subtilis (B, 5ubtilis) [IAM (
Institute of Applied Micro
1168)
is suitable, but in addition to this, Bacillus narratou (B,
natto) [IFO(Institute for
30
09], Bacillus coagulus (B, coagula
ns) [IAM 1115], Bachilua, -'? Acerans (B, +*acerans) [IAM 1243] is also available.

■Streptococcus
) microorganisms of the genus may be any, including Streptococcus faecalis (S, faecalis) [IAM
1119], Streftococcus cremoris (S, c
remoris) [IAM 1150] and Streftococcus lactis (S, 1actis) [IFO1
2546] etc. can be used.

In addition, a type of fungus O) Rhizopus (Rhizopus)
) Microorganisms of the genus include Rhizopus formosaensis.
[IAM 6250], Rhizopus oryzae (Rhi
Rhizopus oryzae) [IAM 6006]J Rhizopus pseudochinensis
[IAM 6042] etc. can be used.

(Microorganisms of the genus Nitrosomonas include Nitrosomonas yo [1 paea (
N, auropaea) [IFo 14298], etc. can be used.

(9 Microorganisms of the genus Nitrobacter include Nitrobacter agilis (N, ag
ilis) [IFO14297], etc. can be used.

(6) As a microorganism of the genus Pseudomonas, Pseudomonas nitroreducens (P, n1troreducens) [IFo 126
94], Pseudomonas caryophyllis (P, c
aryophilis) [IFO12950], Pseudomonas stutzeri (P, 5 tutzeri)
[IFo 3773] can be used.

and (Aspergillus (Aspergi, 11u)
Microorganisms of the genus s) include Aspergillus oryzae (
A, oryzae) [IFO4176], Aspergillus niger (A, niger) [IFO4066], Aspergillus usamii (A, usamii) [UFO
6082] etc. can be used.

In the present invention, by mixing these seven genera of microorganisms, it is possible to provide a group of microorganisms that can quickly decompose and remove adhering organic matter and sources of bad odors in pipelines. Immediately, the microorganisms listed in a. Can be disassembled.

The combination of microorganisms b, (υ, ■, (3)) has the effect of converting sugars in organic matter into organic acids, etc., and these organic acids neutralize the source of bad odors generated in the pipeline. effective.

The microorganisms (4), (5), and (6) have the effect of long-term decomposition of ammonia odor that tends to occur due to decay of organic matter in pipelines. That is, (4) is
Ammonia → NO, (9 is NO8 → No, (6)
is converted into No, -N*, and the ammonia odor is converted into an odorless gas.

d. The microorganisms (1) to (7) and their products decompose organic substances, moss, algae, gummy organic scale, etc. in limescale, so the inner wall of the pipeline can be kept clean.

CO, especially the microorganism (7), converts sugars into organic acids such as citric acid and contributes to the effect of neutralizing bad odors.

Furthermore, production by microbial conversion is advantageous in terms of cost since no energy is required.

In addition, the microorganisms (υ~(7)) produce enzymes such as amylase and protease, and contribute to the neutralization and decomposition of malodor sources.

The microorganisms listed in (1) to (7) below perform their respective functions to decompose and dissolve adhering organic matter scales and sources of bad odors in pipelines, and convert some of them into aromatic substances. You can also do it.

For 10 parts by weight of this microorganism group, 3 to 50 parts of glucose
00 parts by weight, 3 to 5,000 parts by weight of lactose, and 0.3 to 3,000 parts by weight of ammonium chloride to perfect the organic scale decomposition effect.

Glucose serves as a medium and nutrient source for microorganisms, and is converted into organic acids. If the glucose is less than 3 parts by weight,
If the amount exceeds 5000 parts by weight without effectively promoting the growth of microorganisms, the number of microorganisms of the genus Aspergillus, Bacillus, and Pseudomonas will increase too much, making coexistence with other species of microorganisms impossible.

Lactose serves as a subatomic nutrient source for microorganisms (1) to (3) and (3) in particular, and is converted into lactic acid. In the pipeline cleaning method of the present invention, lactose acts as a mask for the source of bad odors, as a source of neutralization, and as a source of aroma generation. It is what it is. If lactose is less than 3 parts by weight, it will not effectively promote the growth of microorganisms, which is inconvenient;
If it exceeds parts by weight, the number of microorganisms such as (υ~+3) of the genus Bacillus will increase too much, making coexistence with other types of microorganisms impossible.

Ammonium chloride is an essential nitrogen nutrient source for the growth and proliferation of microorganisms.

If the amount of ammonia chloride 11 is less than 0.3 parts by weight, it will not effectively promote the growth of microorganisms, which is inconvenient.
If it exceeds 0.00 parts by weight, the decomposition ability of organic substances and malodor sources will be lowered, and it will cause ammonia odor.

Furthermore, a surfactant is added. This is necessary in order to uniformly disperse microorganisms and useful substances in water, and to allow the microbial cleaning solution of the present invention to easily penetrate and come into contact with the scale on the inner wall of the pipeline. This includes anionic,
Cationic or nonionic materials with high wettability are preferred, such as alkylaryl polyether alcohol and sodium dioctyl sulfosuccinate. The surfactant is added in an amount of 0.01 to 20 parts by weight per 10 parts by weight of the microbial mixture. If it is less than 0.01 part by weight, it will not blend in with the scale on the inner wall of the pipeline, making it difficult for the cleaning liquid to penetrate, and the desired effect of the present invention will not be obtained.If it exceeds 20 parts by weight, it will harm the growth of microorganisms. indicates and is not desirable.

Furthermore, as the water used, deionized water or distilled water is suitable, and 300 to 300 parts by weight of the microbial group mixture is used.
Add 6.000.000 parts by weight. An appropriate amount is required as a medium for dissolving microorganisms, nutrient sources, etc. and efficiently producing active ingredients such as enzymes and organic acids. If it is less than 300 parts by weight, the concentration of microorganisms and nutrient sources will be too high and sufficient reaction will not be possible, and if it exceeds 6,000,000 parts by weight, the cleaning solution will be too dilute and the concentration of organisms will be low. The effect of the present invention is diminished.

With such a combination, the pipeline cleaning method of the present invention having the above configuration can also be obtained.

In the specific cleaning method according to the present invention, the above cleaning solution is
The product is sealed and injected into a pipeline where organic scale has accumulated, and left in contact for 30 minutes or more, allowing it to easily impregnate and penetrate into the scale adhering to the inner wall of the pipeline, and decompose and dissolve the adhering scale through the reaction of microorganisms. , and further facilitates peeling. For this purpose, as shown in FIG. 1A, after injecting the above microbial cleaning liquid into the pipeline, rubber plugs
Seal it and leave it for at least 30 minutes, and
To press-fit the pipeline plug 3, as shown in FIG. 1B, after the plug 3 is inserted, a launcher 4 equipped with a hydraulic pump 5 applies pressure to make the plug run.

The pipeline cleaning method using microorganisms of the present invention is suitable for decomposing organic scale adhering to the inner walls of pipelines in a short time.

Furthermore, the pipeline cleaning method using microorganisms of the present invention includes:
It can efficiently treat deposits such as organic scale on small-diameter pipes and coiled pipes such as condensers, oil coolers, boilers, and various heat exchangers.Since the process involves contact with cleaning fluid and plug cleaning, even bendable pipes can be cleaned. Next, the cleaning method using microorganisms of the present invention, which is a cleaning method that is applicable and does not damage the pipe wall, will be explained using a specific example. However, the present invention is not limited to the following examples. none).

[Example] Bacillus subtilis (B, 5ubtil) of the genus Bacillus
is) [IAM 1168] to 1. OOg, Streptococcus lactis (S, 1actis) of the genus Streptococcus [I
Fo 12546] 1. OOg, Rhizopus (Rhi
zopus) II Nori Zobus Oryza z (R0□ry
zae) [IAM 6006], 0.75 g of Aspergillus niger (E, nigar) of the Aspergillus genus [IFO4066]
, 00 g, Nitrobact
Nitrobacter agilis (N, agil) of the genus
is) 0.35 g of [IFo 14297], 2) I:
Nitrosomonas europaea (N, europaea) of the genus Nitrosoaonas
IFo 1429 g] and 0.45 g of Pseudomonas 7, -
Nido rJ L/Pseudomonas
n1troreducans) [IFo 12694
Weighed 0.45g of ] and added glucose 32,5
g, lactose 27.5 g, ammonium chloride 4.5 g, water 5
000cc were mixed uniformly and mixed at 35℃ for 20 hours.
Approximately 5J microbial cleaning solution! I got it.

Next, we looked at two types of steel pipelines with a radius of 1 inch and a length of 3 meters, with the inner wall covered with approximately 95% water scale and water moss, and the inner diameter with black gummy scale attached. The test was conducted on a 1-inch gas pipe (3 m long).

Furthermore, as a pipeline cleaning plug used in tests,
A bullet-shaped molded product made of semi-rigid polyurethane foam with an outer diameter of 2.7 cm and a height of 5 ca+ (density 0.195 g/crm).
”, tensile strength 7, 5 kg/crn”, elongation rate 5
50%) was created.

Prepare these, fill the pipeline to be cleaned with microbial cleaning solution, and leave it for 60 minutes until the water pressure reaches zero.
A test was conducted by allowing the pipeline cleaning plug to run at a speed of 2 kg/c.

[Test Results] As a comparative example, the pipeline was filled with water and a pipeline cleaning plug was used to allow running at a water pressure of 0.2 kg/ass.
7) The pipeline was cleaned using water pressure using a pipeline cleaning plug.

A pipeline with a radius of 1 inch and a length of 3 m, made of steel, with an ammonia concentration of 7.5 pp @ (measured with a northern detection tube) with an inner wall of approximately 95% or more of water scale and water moss. In contrast to A], after cleaning with the above-mentioned cleaning method of the comparative example, the ammonia concentration was 7.0 ppm on the inner wall of Eveline, and water moss was not removed. Similarly, in a steel pipeline with a radius of 1 inch and a length of 3 m, the inner wall has approximately 95% or more of water stains and water moss, and the ammonia concentration is 6.0 ppm (measured with a northern detection tube). After cleaning a certain pipeline [B] using the cleaning method described above in the comparative example, the ammonia concentration was 5.0 ppm on the inner wall of the pipeline, and water scale was not removed. In addition, black I/inner diameter 1 where about 10% of the inner surface is covered with gum-like adhesive scale.
As a comparative test, an inch gas pipe (length: 3 m) was cleaned using the cleaning method described above, but the gum-like organic matter remained without being completely removed.

On the other hand, as in the example, the results of a cleaning test showed that a steel pipeline with a radius of 1 inch and a length of 3 m had an ammonia concentration of approximately 95% or more of water scale and water moss on the inner wall. For pipeline [A] with 7.5ppIII (measured with the northern type detector tube), after cleaning,
The ammonia concentration on the inner wall of the pipeline was 0 ppsa, and scale had been almost completely removed. Similarly, a steel pipeline with a radius of 1 inch and a length of 3 m has an ammonia concentration of 6.0 ppa+ (measured with a northern detection tube) with water stains and water moss on the inner wall of approximately 95% or more.
For a certain pipeline [B], after cleaning according to the present invention, the ammonia if 1 degree Opp- was found on the inner wall of the pipeline, and scale was almost completely removed.

Furthermore, for gas pipes with an inner diameter of 1 inch (3 m in length) to which about 10% of the inner surface is covered with black gummy adhesive scale, the gummy organic matter is completely removed after cleaning according to the present invention. removed.

As can be seen from these results, the pipeline cleaning method using microorganisms of the present invention had a deodorizing effect and was able to remove scale that could not be removed by normal methods.

[Effects of the Invention] The pipeline cleaning method using microorganisms of the present invention first has the following features:
While the main effect of conventional pipeline cleaning methods was to remove scale through mechanical grinding, this method can almost completely peel off and remove scale from the inner walls of pipelines, and also suppresses bad odors. Can be done.

Second, although the details of the mechanism for removing scale and suppressing bad odors in pipelines are not certain, we believe that the following effects are achieved. That is, first, microorganisms, enzymes, organic acids, etc. in the microbial cleaning solution invade the cracks and surfaces of water scale, water moss, and gum-like organic matter that adhere to the inside of the pipeline, as well as the interface with the pipeline.
Sufficient catalytic decomposition decomposes the adhered scale, and at the same time, microbial growth occurs, and enzymes and organic acids are also produced, accelerating the decomposition, dissolution, and peeling of the adhered scale. By opening c1- for a certain period of time, the above-mentioned effects are enhanced, and most of the attached scale on the pipeline inner wall is decomposed, dissolved, and peeled off. Such attached scale is also a source of bad odors. It also helps remove bad odors.

Furthermore, after these steps, cleaning is completed by physically discharging the microbial cleaning solution and attached scale using a pipeline cleaning plug made of polyurethane foam.

Thirdly, the pipeline cleaning method of the present invention biochemically decomposes, dissolves, and peels off organic scale, which has been difficult to clean in the past, and physically discharges it. It is also possible to completely prevent the adhesion of limescale that occurs on the skin.

Therefore, the organic scale generated in the pipeline,
It is extremely meaningful industrially because the source of bad odors can be treated biochemically.

[Brief explanation of the drawing]

FIGS. 1A and 1B are schematic diagrams showing the pipeline cleaning method using microorganisms of the present invention. 1st! ! A

Claims (2)

[Claims] (1) Genus Bacillus, genus Streptococcus, genus Rhizopus, genus Nitrosomonas, genus Nitrobacter, genus Pseudomonas, and Aspergillus 7 of the genus Aspergillus A cleaning solution consisting of glucose, lactose, ammonium chloride, surfactant, and water is prepared in a mixture of microorganisms of the genus, and this cleaning solution is sealed and injected into the pipeline where organic scale is deposited.
The scale is left in contact for at least a minute and immersed in the scale attached to the inner wall of the pipeline to decompose, dissolve or peel it off, and then a porous resin pipeline cleaning plug is inserted into the pipeline using water pressure. A pipeline cleaning method characterized in that organic scale is removed and cleaned from the inner wall of the pipeline by running the pipeline. (2) In the pipeline cleaning method according to claim 1, the cleaning liquid contains 3 to 5,000 parts by weight of glucose, 3 to 5,000 parts by weight of lactose, and 0.5 to 0.5 to 5,000 parts of ammonium chloride per 10 parts by weight of the microorganism group. 3000 parts by weight, surfactant 0.01-20 parts by weight, water 300-6,000,00
The pipeline cleaning method, characterized in that the pipeline cleaning method is comprised of 0 parts by weight.