KR101021035B1 - Cleaning method of water reservoir using nontoxic and eco-friendly cleaner - Google Patents

Abstract

PURPOSE: A method for cleaning a water reservoir is provided to secure high cleaning performance by using dodecylglycerol ethoxylate, instead of toxic hydrogen peroxide, as nonionic surfactant. CONSTITUTION: A method for cleaning a water reservoir using non-toxic and environmentally-friendly cleaning solution is as follows. The water of a water reservoir is drained(S1). A water reservoir cleaning solution is prepared by mixing organic acid 100wt.%, dodecylglycerol ethoxylate 1~10wt.%, and water 1500~2500wt.%, wherein the organic acid is composed of citric acid 100wt.%, ascorbic acid 5~15wt.%, glycolic acid 70~180wt.%, and gluconic acid 70~180wt.%. The water reservoir cleaning solution is sprayed with a low-pressure electric sprayer onto the wall and bottom surfaces of the water reservoir(S2). The water reservoir cleaning solution on the wall and bottom surfaces of the water reservoir is washed off.

Description

Cleaning method of water reservoir using nontoxic and eco-friendly cleaner

The present invention relates to a reservoir cleaning method, and more particularly, to a reservoir cleaning method for washing an indoor or outdoor reservoir using a non-toxic and environmentally friendly cleaning liquid.

Reservoir is a generic term for a device that stores tap, rain, or river water for use as drinking or living water. Water is stored in the reservoir for a certain period of time, and as the storage period is extended, the inner wall of the reservoir may be contaminated and should be periodically cleaned. Maintaining the cleanliness of the reservoir is not only hygienic, but is also necessary for water laws. In particular, the owner or manager of a large building should clean the water tank at least once every half year.In case of cleaning, clean the ceiling, walls and floor of the water tank, disinfect it after cleaning, and then drain the water tank. It is regulated to check hygiene condition of water quality after filling.

The causes of contamination of the reservoirs are varied, such as contamination by precipitation of inorganic salts such as carbonates dissolved in water, contamination by the growth of microorganisms, or contamination by algae such as moss. Physical washing using a brush or a loofah may be used for washing the reservoir, but chemical washing using a cleaning solution containing a specific component is generally used. Chemical cleaning is less labor than physical cleaning, excellent cleaning effect, especially when the cleaning is difficult due to the small entrance. Conventional cleaning solutions used for chemical cleaning of reservoirs are those in which a surfactant is added to an acidic or basic cleaning component, and specific configurations and problems are as follows.

The cleaning solution mainly composed of an anionic surfactant contains anionic surfactants such as alkanesulfonates, alkyl ether sulphates, and linear alkylbenzene sulfonates as the main components, and also contains fatty acid alkanolamide components as nonionic surfactants and bubble stabilizers. Various additives, such as zeolite and a silicate, are contained. However, such a cleaning liquid containing an anionic surfactant as a main component has a problem in that the acidity of the cleaning liquid itself must be basic and the bubbles are so severe that it is very difficult to use in a water tank, and the basic cleaning liquid cannot remove the deposited inorganic salts.

Another type of cleaning liquid that can solve the problem of the basic cleaning liquid is an acidic cleaning liquid. The acidic cleaning liquid is an acidic cleaning liquid having an acidity of about 2 to 6, and has an advantage of effectively removing inorganic salts and moss accumulated in the reservoir. Acidic cleaning liquids include various acids such as phosphoric acid and alkylenesulfonic acid. Phosphoric acid is not suitable for use as a component of the cleaning liquid because its use is very limited due to river eutrophication.

Korean Laid-Open Patent Publication No. 2007-0104181, which is a domestic prior art document relating to an acidic cleaning solution, discloses a cleaning solution for removing organic contaminants from stone or metal materials, and includes polyoxyethylene oxide condensed nonionic surfactants, whitening materials and microorganisms. It contains highly toxic substances such as hydrogen peroxide and hydrofluoric acid or hydrochloric acid for cleaning pollutants. Korean Laid-Open Patent No. 2007-0003854 is a cleaning liquid used after a chemical mechanical polishing (CMP) process, and includes ammonium citrate, ammonium oxalate, a nonionic surfactant, a cationic surfactant, an amphoteric surfactant, and the like. Disclosed is a cleaning liquid containing variously. Korean Laid-Open Patent Publication No. 2005-0053725 discloses that a polyacrylate, a polymer material, can be added to an acidic cleaning solution to remove a contamination of a tile in a bathroom, a toilet, a toilet, or an indoor tile. Korean Laid-Open Patent Publication No. 2001-0015752 discloses a technique for an acidic cleaning liquid composition using an alkoxylated amine, wherein the acidic cleaning liquid is alkoxylated aliphatic amine and sulfamic acid, hydrogen peroxide or peracetic acid and nonionic interface to exhibit antimicrobial activity. The activator includes an ethoxylated aliphatic alcohol.

US Patent Publication No. 2008-0045439, an overseas prior art document relating to acidic cleaning liquids, includes a citric acid, fatty acid alcohol or polyethoxylate-type surfactant, sodium bisulfite, glycerin, and the like as a low-foaming industrial cleaning liquid. Disclosed compositions are disclosed. US Patent Publication No. 2008-0132439 discloses a composition containing diethylene glycol, triethylene glycol, sodium dodecylbenzenesulfonate as an alkyl glycoside, glyceryl, ether, and an organic solvent component. In addition, US Patent Publication No. 2008-0139443 discloses an acidic cleaning solution containing quaternary ammonium salt, citric acid which is an organic acid, and glycol methyl ether, ethanol, glycol monobutyl ether, etc. as an organic solvent. It is known.

Among the prior arts for the acidic cleaning liquids, acidic cleaning liquids using strong inorganic acids such as hydrochloric acid and phosphoric acid to give acidity to the cleaning liquid have a high risk of environmental pollution, and hydrogen peroxide, peracetic acid, etc. Since it is toxic to the human body, additional efforts are required to remove the cleaning liquid after cleaning. Therefore, there is a great need for the development of a water tank cleaning method using an environment-friendly water tank cleaning liquid, which is free from environmental pollution and is less toxic to the human body.

Accordingly, the problem to be solved by the present invention is to provide a method for cleaning a reservoir using a reservoir cleaning liquid having excellent cleaning effect without containing toxic substances such as inorganic acids and hydrogen peroxide.

The present invention, in order to achieve the above object, the step of draining the water of the reservoir and the organic acid consisting of 100 parts by weight of citric acid, 5 to 15 parts by weight of ascorbic acid, 70 to 180 parts by weight of glycolic acid and 70 to 180 parts by weight of gluconic acid Preparing a water tank cleaning liquid prepared by mixing 100 parts by weight, 1 to 10 parts by weight of dodecylglycerol polyethoxylate represented by Formula 1 below, and 1500 to 2500 parts by weight of water, and using a low pressure electric sprayer. It provides a reservoir cleaning method comprising the step of spraying the reservoir cleaning liquid on the wall and bottom surface of the reservoir, and washing the reservoir cleaning liquid sprayed on the wall and the bottom surface.

Formula 1

(m, n are integers, m + n = 2 to 10)

According to one embodiment of the invention, the organic acid may further comprise 10 to 30 parts by weight of oxalic acid or 30 to 70 parts by weight of malonic acid relative to 100 parts by weight of citric acid.

According to another embodiment of the present invention, the reservoir cleaning liquid may further include dodecylglycerol.

Using the water tank cleaning method of the present invention, it is possible to effectively remove the organic contaminants and adherent moss that contaminated the wall surface of the water tank. In addition, the cleaning solution used in the water tank cleaning method of the present invention does not use toxic hydrogen peroxide, and dodecylglycerol ethoxylate synthesized by ethoxylating dodecylglycerol as a nonionic surfactant to ensure excellent cleaning ability It was. Furthermore, the cleaning liquid used in the water tank cleaning method of the present invention contains organic acids such as citric acid, ascorbic acid and glycolic acid as main components, and thus has very low toxicity compared to the cleaning liquid using inorganic acids, and there is little concern about environmental pollution.

Figure 1 shows step by step the cleaning method of the reservoir of the present invention.
2 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-5 synthesized in accordance with an embodiment of the present invention.
3 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-7 synthesized in accordance with an embodiment of the present invention.
4 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-10 synthesized in accordance with an embodiment of the present invention.
Figure 5 is a photograph showing the results of the adhered moss removal experiment using the reservoir cleaning liquid of the present invention.
Figure 6 is a photograph showing the results of the algae solution experiment using the reservoir cleaning liquid of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The water tank cleaning method of the present invention comprises the steps of draining the water of the reservoir, 100 parts by weight of organic acid consisting of 100 parts by weight of citric acid, 5 to 15 parts by weight of ascorbic acid, 70 to 180 parts by weight of glycolic acid and 70 to 180 parts by weight of gluconic acid. 1 to 10 parts by weight of dodecylglycerol polyethoxylate represented by the following Chemical Formula 1, and preparing a water tank cleaning liquid prepared by mixing 1500 to 2500 parts by weight of water, and using a low pressure electric sprayer, the wall surface of the water tank. And spraying the reservoir cleaning liquid on the bottom surface, and washing the reservoir cleaning liquid sprayed on the wall surface and the bottom surface.

Formula 1

(m, n are integers, m + n = 2 to 10)

Figure 1 shows step by step the cleaning method of the reservoir of the present invention. Referring to Figure 1, the reservoir cleaning method of the present invention proceeds in the order of drainage operation (S1), washing liquid injection (S2), high-pressure water injection (S3), rinsing operation (S4) and the residual water drainage (S5). Drainage operation (S1) is a first step for cleaning the reservoir, the process of discharging the water stored in the reservoir. In the case of a water tank on the roof of an apartment, drainage may be necessary because of gravity, but when drainage using gravity is not easy, such as a purification facility, drainage may be performed using a drainage pump. have. Although not shown in the drawings, if necessary, before and after the drainage work, or at the same time, a step of installing a lighting device or a ventilation device for cleaning may be added. Cleaning liquid injection (S2) is a step of spraying the cleaning liquid to remove the contaminants formed on the bottom surface or wall surface of the reservoir. Contaminants are mainly organic contaminants such as scale, moss, etc., and the components of the cleaning liquid can be adjusted according to the type of the main contaminants. Since the injection of the cleaning liquid is important to inject the cleaning liquid into the contaminants so that the contaminants can come into contact with the cleaning liquid for a sufficient time, it is appropriate to use a low pressure electric sprayer for the injection of the cleaning liquid. The high pressure water spray S3 is a process of removing contaminants decomposed or dissolved by the cleaning solution from the bottom and the wall of the reservoir. That is, even though the contaminants are decomposed or dissolved by the cleaning liquid, the residues of the contaminants remain weakly attached to the wall surface of the reservoir, and thus, the contaminants should be removed using high pressure washing water. In the process of high pressure water injection may be used a high-pressure electric sprayer. The process of the cleaning liquid injection (S2) and / or high pressure water injection (S3) may be repeated a plurality of times if necessary, it may be sprayed by adding the cleaning liquid to a certain concentration in the high pressure water. Rinse operation (S4) is a process of washing the cleaning liquid and contaminants remaining on the bottom or wall of the reservoir after the cleaning liquid injection and high-pressure water injection. After the cleaning liquid injection and the high-pressure water injection, the cleaning liquid and contaminants accumulate on the bottom surface of the reservoir, and therefore, especially the rinsing operation of the bottom surface is necessary. Residual drainage (S5) is a process of removing the residual water accumulated on the bottom surface of the reservoir. Residual drainage process may allow for natural drainage by gravity, or a continuous discharge wet vacuum cleaner may be used.

The water tank cleaning method of the present invention is characterized by using a cleaning liquid containing an organic acid and a surfactant having a specific chemical formula. Organic acids are environmentally friendly materials that are not toxic to humans, so they can have two effects: worker safety and environmental protection. In addition, the surfactant of the formula (1) applied to the cleaning solution of the present invention improves the wettability of water and grease to improve the effect of removing contaminants. Hereinafter, the experimental results of the manufacturing process and the effect of the cleaning liquid applied to the water tank cleaning method of the present invention will be described.

The reservoir cleaning liquid applied to the present invention includes water, an organic acid and dodecylglycerol polyethoxylate. Water is a solvent of the washing liquid, an organic acid is a component for imparting acidity to the washing liquid, and dodecylglycerol polyethoxylate is a nonionic surfactant. The organic acid includes citric acid, ascorbic acid, glycolic acid and gluconic acid, and the composition ratio is 100 parts by weight of citric acid and 5 to 15 weight of ascorbic acid. It is preferable that they are 70-180 weight part and glycolic acid 70-180 weight part. The mixing ratio of the organic acids can be freely adjusted in the numerical range described, since the main pollutants may vary depending on the use environment of the reservoir can be used by selecting the appropriate mixing ratio. In addition, the organic acid may further include oxalic acid or malonic acid, and oxalic acid is preferably included in an ingredient ratio of 10 to 30 parts by weight with respect to 100 parts by weight of citric acid, and malonic acid is 30 to 70 parts by weight. It is preferable to be contained in a negative component ratio. Since oxalic acid has a function of effectively removing rust and ink contaminants, when oxalic acid is included in the reservoir cleaning liquid, oxalic acid may also have an effect of removing rust that may occur in the metal reservoir. In addition, oxalic acid can increase the washing ability in a small amount compared to malonic acid, and also has a lower price than the malonic acid.

In the present invention, the dodecylglycerol polyethoxylate represented by the formula (1) was synthesized, and using this, it was possible to develop an acidic washing liquid having excellent cleaning effect through blending with an organic acid. Dodecylglycerol polyethoxylate was synthesized by the following reaction scheme 1 (scheme 1). Referring to the following Synthesis Scheme 1, dodecylglycerol was synthesized by adding water to the epoxide under basic conditions and ring opening reaction, and ether chain was extended by adding ethylene oxide under basic conditions. Synthesized dodecylglycerol polyethoxylates.

Synthetic Scheme 1

In this case, dodecylglycerol polyethoxylates having different molecular weights may be synthesized according to the equivalent weight of ethylene oxide. For example, when 5 equivalents of ethylene oxide is added to 1 mole of dodecylglycerol, dodecylglycerol polyethoxylate-5 (DGO-5) is synthesized, and when 7 equivalents of ethylene oxide is added, dodecylglycerol polyethoxyl Rate-7 (DGO-7) is synthesized, and dodecylglycerol polyethoxylate-10 (DGO-10) can be synthesized when 10 equivalents of ethylene oxide is added. However, the compound produced when synthesizing the dodecylglycerol polyethoxylate by the above synthesis scheme 1 is not only one kind. For example, when 5 equivalents of ethylene oxide is added to 1 mole of dodecylglycerol, the main product is dodecylglycerol polyethoxylate-5 (DGO-5), but other products having different molecular weights May be present in proportion. In addition, some unreacted dodecylglycerol may be present in the product, which imparts antimicrobial activity to the reservoir cleaning liquid. The antimicrobial effect of dodecylglycerol has been known from the literature (H.S. Ved, et al, The J. Biological Chemistry, 259 (13), 8115-8121, (1984)). Therefore, when the product obtained through the synthesis scheme 1 is added to the water tank washing liquid as it is, the antimicrobial effect can be exerted on the washing liquid to maximize the washing effect. The washing ability is changed according to the composition ratio of the dodecylglycerol polyethoxylate contained in the washing liquid, and the preferred composition ratio is 100 parts by weight of organic acid and 1 to 10 parts by weight of dodecylglycerol polyethoxylate. If the content ratio of dodecylglycerol polyethoxylate is less than 1 part by weight, the dispersing effect of hydrophobic contaminants by the surfactant is less, and the cleaning ability is lowered. Lowers.

The reservoir cleaning liquid applied to the present invention may further include LX-94. LX-94 is a product name of a nonionic surfactant manufactured and sold by Hannong-Sung Co., Ltd., and is produced by copolymerizing ethylene oxide and propylene oxide. Since LX-94 is a low-foaming surfactant, it functions to suppress the generation of bubbles in the water tank cleaning operation. Therefore, the addition of an appropriate amount of LX-94 has the effect of suppressing the generation of bubbles in the reservoir cleaning liquid to increase the amount of dodecylglycerol polyethoxylate added. The amount of LX-94 added is preferably about 15 parts by weight or more based on 100 parts by weight of citric acid. This is because when the amount of LX-94 added is too small, the effect of inhibiting bubbles is small and dodecylglycerol polyethoxylate cannot be sufficiently added.

Hereinafter, the present invention will be described in more detail using examples. The embodiments are only intended to describe the present invention in more detail, and the scope of the rights is not limited by the embodiments, and the scope of the rights should be interpreted only by the matters described in the claims.

Example 1-1 (Synthesis of Dodecylglycerol Ethoxylate-5)

1 mole of dodecylglycerol (mw: 260) and 0.1 mole of potassium hydroxide (KOH) were added to a 1 liter high-pressure reactor, and 5 moles of ethylene oxide were maintained for about 6 hours while maintaining the reactor temperature in the range of 120 to 140 ° C. Reacted. Subsequently, after lowering the reaction temperature and the pressure to normal and normal pressure, potassium hydroxide (KOH) was neutralized with about 0.1 mole of acetic acid.

Example 1-2 (Synthesis of Dodecylglycerol Ethoxylate-7)

Synthesis was carried out in the same manner as in Example 1-1, except that the amount of ethylene oxide was changed to 7 mol.

Example 1-3 (Synthesis of Dodecylglycerol Ethoxylate-10)

Synthesis was carried out in the same manner as in Example 1-1, except that the amount of ethylene oxide was changed to 10 mol.

Example 2-1 (Preparation of Cleaning Liquid 1)

Washing liquid 1 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, 15 g of LX-95, and 5 g of GDO-10 in 360 g of water.

Example 2-2 (Preparation of Cleaning Liquid 2)

Washing liquid 2 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, 15 g of LX-95, and 15 g of GDO-10 in 360 g of water.

Example 2-3 (Preparation of Cleaning Liquid 3)

Washing liquid 3 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, 15 g of LX-95, and 25 g of GDO-10 in 360 g of water.

Example 2-4 (Preparation of Cleaning Liquid 4)

Washing liquid 4 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, 15 g of LX-95, and 5 g of GDO-7 in 360 g of water.

Example 2-5 (Preparation of Cleaning Liquid 5)

Washing solution 5 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, 15 g of LX-95, and 15 g of GDO-7 in 360 g of water.

Example 2-6 (Preparation of Cleaning Liquid 6)

Washing solution 6 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, 15 g of LX-95, and 25 g of GDO-7 in 360 g of water.

Example 2-7 (Preparation of Cleaning Liquid 7)

Washing liquid 7 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of malonic acid, 100 g of gluconic acid, 15 g of LX-95, and 15 g of GDO-10 in 360 g of water.

Example 2-8 (Preparation of Cleaning Liquid 8)

Washing solution 8 was prepared by dissolving 50 g of citric acid, 10 g of ascorbic acid, 70 g of glycolic acid, 100 g of malonic acid, 100 g of gluconic acid, and 10 g of GDO-10 in 360 g of water.

Comparative Example 1 (Preparation of Cleaning Liquid 9)

Washing solution 9 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, 15 g of LX-95, and 1 g of GDO-10 in 360 g of water.

Comparative Example 2 (Preparation of Cleaning Liquid 10)

Washing solution 10 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of malonic acid, 100 g of gluconic acid, 15 g of LX-95, and 50 g of GDO-10 in 360 g of water.

Comparative Example 3 (Preparation of Cleaning Liquid 11)

Washing liquid 11 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of malonic acid, 100 g of gluconic acid, 15 g of LX-95, and 15 g of GDO-7 in 360 g of water.

Comparative Example 4 (Preparation of Cleaning Liquid 12)

Washing liquid 12 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of malonic acid, 100 g of gluconic acid, and 15 g of LX-95 in 360 g of water.

Table 1 below summarizes the components of the Examples and Comparative Examples.

TABLE 1

Assay Example 1 (of dodecylglycerol ethoxylate-5 ^One H NMR)

In order to confirm that dodecylglycerol ethoxylate-5 was synthesized according to Example 1-1, ¹ H NMR analysis was performed in a CDCl ₃ solution. 2 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-5 synthesized in accordance with an embodiment of the present invention. Referring to Fig. 2, a characteristic peak of dodecylglycerol ethoxylate-5 is observed. From this it can be seen that the main product synthesized according to Example 1-1 is dodecylglycerol ethoxylate-5.

Assay Example 2 (of dodecylglycerol ethoxylate-7 ^One H NMR)

In order to confirm that dodecylglycerol ethoxylate-7 was synthesized according to Example 1-2, ¹ H NMR analysis was performed in a CDCl ₃ solution. Referring to FIG. 3, the properties of dodecylglycerol ethoxylate-7 Peaks are observed. From this it can be seen that the main product synthesized according to Example 1-2 is dodecylglycerol ethoxylate-7.

Assay Example 3 (of dodecylglycerol ethoxylate-10 ^One H NMR)

In order to confirm that dodecylglycerol ethoxylate-10 was synthesized according to Example 1-3, ¹ H NMR analysis was performed in a CDCl ₃ solution. Referring to FIG. 4, the properties of dodecylglycerol ethoxylate-10 Peaks are observed. From this it can be seen that the main product synthesized according to Example 1-3 is dodecylglycerol ethoxylate-10.

Experimental Example 1 (residual carbon amount measurement experiment)

Residual carbon content measurement experiments were performed to compare the cleaning ability of the cleaning solution 1 to the cleaning solution 12 prepared according to Examples and Comparative Examples. After mixing animal oil with vegetable oil and hydrocarbon oil, apply a certain amount on stainless steel plate (2cmX5cm), and then immerse in 600ml (25 ℃) of 5% cleaning solution for 10 minutes, wash once in distilled water, and leave residual carbon on stainless steel plate. (Surface Carbon Determinator RC-212, LECO Corporation) was measured.

The measurement results are summarized in Table 2 below. Referring to Table 2, the cleaning liquids (washing liquids 1 to 8) prepared according to Examples 2-1 to 2-2 were added to the cleaning liquids (washing liquids 9 to 12) prepared according to Comparative Examples 1 to 4. Compared with the amount of residual carbon. In particular, the cleaning solution 12 containing no surfactant dodecylglycerol ethoxylate was measured to have a very high residual carbon amount of 149.7, and the cleaning solution 9 containing a relatively small amount of dodecylglycerol ethoxylate-10 also had a high residual carbon amount of 109.5. Was measured. From these results, it can be seen that the washing ability is significantly increased when dodecylglycerol ethoxylate is added to the organic acid. In addition, when 50 g of dodecylglycerol ethoxylate-10 was contained as in the washing solution 10, it was determined that the washing ability was lower than that of the washing solution 3 containing 25 g of dodecylglycerol ethoxylate-10.

When dodecylglycerol was compared with the cleaning capacity of the cleaning solution 1, the cleaning solution 4, the cleaning solution 2 and the cleaning solution 5, the cleaning solution 3 and the cleaning solution 6, in which the same amounts of dodecylglycerol ethoxylate-10 and dodecylglycerol ethoxylate-7 were added. The cleaning ability when ethoxylate-10 was added was determined to be slightly higher.

Although not shown in Table 2, when only water was used instead of the cleaning solution, the residual carbon amount of 180.3 was measured.

TABLE 2

Experimental Example 2 (attached moss removal experiment)

Attached moss removal experiment was performed using the cleaning solution prepared according to Examples and Comparative Examples. The algae used in the experiment was Scenedesmus sp. As a freshwater microalgae, and the culture medium was incubated for about 1.5 months using Allen medium.

For removing the algae attached to the culture vessel wall, the plastic vessel wall was cut out to a predetermined size and then immersed in 50 ml of a 1% washing solution for 9 hours and washed with running tap water. The degree of washing of each piece was as shown in FIG.

Referring to FIG. 5, when untreated, a large amount of adherent moss was observed to the naked eye, and in the case of the cleaning solution 9 and the cleaning solution 10, most of the attaching moss was removed, but some remained visible to the naked eye. In the case of the cleaning solution 3, the adhered moss was almost removed and was not observed visually.

Experimental Example 3 (Experiment Using Algae Solution)

As a result of Experimental Example 1 and Experimental Example 2, the algae removal test in the solution was performed using the cleaning solution 3 having the highest cleaning power and excellent adhesion moss removal effect. 4 ml of the washing solution 3 was added to 40 ml of the algae solution, and the change of the solution was photographed after one hour.

Referring to FIG. 6, after 1 hour, it was confirmed that most of the algae present in the solution were decomposed.

Claims (3)

Draining the water of the reservoir;
100 parts by weight of citric acid, 5 to 15 parts by weight of ascorbic acid, 70 to 180 parts by weight of glycolic acid and 70 to 180 parts by weight of gluconic acid, and dodecylglycerol polyethoxylate represented by the following Chemical Formula 1 Preparing a reservoir cleaning liquid prepared by mixing 1 to 10 parts by weight and 1500 to 2500 parts by weight of water;
Spraying the reservoir cleaning liquid on the wall and bottom of the reservoir using a low pressure electrospray; and
Washing the reservoir cleaning liquid sprayed on the wall surface and the bottom surface; reservoir cleaning method comprising a.

Formula 1

(m, n are integers, m + n = 2 to 10) The method according to claim 1,
The organic acid is a storage tank washing method further comprises 10 to 30 parts by weight of oxalic acid or 30 to 70 parts by weight of malonic acid relative to 100 parts by weight of citric acid. The method according to claim 1,
Reservoir cleaning method for a reservoir, further comprising dodecylglycerol.

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