JPH0534397B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a cloth cleaning agent for a sludge dewatering machine,
In particular, the present invention relates to a cloth cleaning agent effective for cleaning cloth in a belt press dehydrator and a cleaning method using the cleaning agent. [Prior Art] Conventionally, methods for washing cloth include (1) water washing using low or high pressure, (2) acid washing using hydrochloric acid, or
(3) Surfactant, builder, alkali metal compound,
An alkaline cleaning method using a cleaning solution containing at least one of an enzyme, a chelating reagent, an oxidizing agent, or a reducing agent has been used. Among these, the water washing method (1) is a method in which high-pressure water is applied to a dry cloth to remove dirt, and the acid washing method (2) is a method in which the cloth is removed and immersed in a cleaning liquid tank. In addition, the alkaline cleaning method (3) is a method in which dirt is removed by spraying it directly on the cloth with a water fountain, or by manually applying it to the cloth using a brush or brush. Among the above methods, when jet cleaning is performed, several people are required to perform it, and this cleaning method can only hope to remove a small amount of deposits. If you use a water can to spray the cleaning liquid, the cleaning liquid will run off the cloth, so you will end up washing with the small amount of liquid that remains on the cloth, and most of the used liquid will be wasted. Removing the cloth and soaking it in a cleaning solution while removing dirt is more effective than leaving it attached, but removing the cloth is difficult and takes several hours. In addition, methods that involve spraying a cleaning solution or removing the cloth and soaking it in a cleaning tank require spraying a large amount of strong acidic or alkaline cleaning solution, and when handling cloth with cleaning solution on it, it may stick to the skin or cause mist. It is dangerous if it gets in your eyes. [Problems to be Solved by the Invention] As described above, in the prior art, there are various problems no matter which method is used, and no method has been found to be satisfactory. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cloth cleaning agent that is convenient to handle, economical, and has a high cleaning effect, and a cleaning method using the same. [Means for Solving the Problems] As a result of intensive research, the present inventors have found that the above object can be achieved by adding a thickener to a cleaning liquid mainly containing an alkali metal hydroxide to make it gel-like. They discovered this and completed the present invention. That is, the present invention resides in a cloth cleaning agent characterized by mixing an organic thickener with a cleaning liquid containing an alkali metal hydroxide as a main component to form a gel. Further, the present invention provides a method in which the above-described cloth cleaning agent is applied to at least one of the cloths of a belt press dehydrator, and is transferred to the other cloth in the pressing section of the dehydrator, and after a certain period of time has passed, the cloth is There is also a method for washing cloth in a belt press dehydrator, which is characterized by washing the cloth with water. Next, the present invention will be explained in detail. The organic thickener that can be used in the present invention can be selected from natural, semi-synthetic and synthetic thickeners. As natural organic thickeners, plant gums such as gum arabic and gum dragand, and seaweeds such as alginic acid and funori can be used. When using natural systems, the amount added is 20-45% by weight for vegetable gums, and for seaweeds.
A range of 0.5 to 10% by weight is preferable. As the semi-synthetic organic thickener, cellulose types such as methylcellulose, ethylcellulose, carboxymethylcellulose, and hydroxyethylcellulose can be used, and the amount added in this case is preferably in the range of 20 to 45% by weight. Furthermore, as synthetic organic thickeners, vinyl-based, acrylic-based, polyethylene oxide-based, and polyvinyl alcohol-based thickeners can be used. Among these, vinyl-based organic thickeners include vinyl acetate-acrylic acid ester copolymer, Bi-acetate-maleic anhydride copolymer and isobutylene-maleic anhydride copolymer can be used in an amount of 1 to 20% by weight, and examples of acrylic organic thickeners include sodium polyacrylate and acrylic. Acid-vinyl alcohol copolymer, acrylic acid-denbane copolymer, etc. can be used in an addition amount of 0.5 to 10% by weight, and polyethylene oxide, polyethylene imine, etc. can be used as a polyethylene oxide-based organic thickener. It can be used in an amount of 0.5 to 20% by weight, and furthermore, polyvinyl alcohol-based organic thickeners include polyvinyl alcohol,
A vinyl alcohol-maleic acid ester copolymer or the like can be used in an amount of 0.5 to 10% by weight. One or more of these organic thickeners can be added to make the cleaning liquid gel-like.
Viscosity range of the gel used (measured with a rotational viscometer)
If it is less than 400 cp, the cleaning liquid will run off the cloth, and if it is more than 70,000 cp, it will become lumpy and difficult to apply. As the cleaning liquid containing an alkali metal hydroxide as a product that can be used in the present invention, a commonly used alkaline cleaning liquid can be used. The cleaning power can also be strengthened by appropriately adding agents and the like. Furthermore, the amount of liquid used can be reduced by adding a thickener to these cleaning liquids. In this case, it is necessary to increase at least the concentration of the alkali metal hydroxide to some extent. When applied to a cloth, the gel-like cloth cleaning agent does not run off the cloth and maintains its applied shape, and by applying it to one cloth and moving the cloth, it is applied to the other cloth at the pressing part. will also be transcribed. If the cloth cleaning agent is applied by a supply device using a box-shaped member fixed onto the cloth of the dehydrator, the cloth can be easily and continuously applied. The above-mentioned feeding device using a box-shaped member is such that a box-shaped member with an open side opposite to the cloth running direction is placed on the cloth of a belt press dehydrator, and the lower end of the box-shaped member on the cloth running direction side is connected to the cloth. The box-shaped member is configured to be spaced apart from each other with an appropriate gap, and an inlet for the cloth cleaning agent is provided in the box-shaped member. According to the supply device, the cloth cleaning agent is constantly supplied into the box-shaped member from the inlet, and is applied to the entire surface of the cloth at a constant thickness from the gap at the lower end in the cloth running direction. Stable coating without any leakage can be performed using a simple device. [Examples] Examples of the present invention will be described below, but the present invention is not limited to these Examples. Example 1 In order to compare the cleaning power of the fabric cleaning agent of the present invention, a cleaning experiment was conducted using sample fabrics. The cloth used in the cleaning experiment was actually dehydrated for four months at a sewage treatment plant, and had an air permeability of 60.
cc/sec/ ^cm2 , 10 pieces of cloth cut into ^{100cm2 pieces}
Used as a set. In the experiment, each cloth was fixed in the air, 7g of each cleaning agent was applied to each 100cm ² cloth, and after 30 minutes, water was poured on the cloth to remove the cleaning agent. The water flow rate is 2/min and the water pressure is 3.0 Kg/cm ² . The results of this experiment are the dry weight before and after washing (110℃)
An evaluation was made based on the difference in air permeability and an air permeability test. The results are shown in Table-1. However, the air permeability recovery rate in the table is a percentage of the air permeability of the new cloth, which is 157 cc/sec/cm ² . For cloth cleaning, the following cleaning solution and thickener were mixed and gelled. Cleaning liquid components...20% aqueous solution containing the following ingredients Alkali metal hydroxide: 60% Builder: 30% Enzyme: 1% Surfactant: 3% Chelating reagent: 6% Thickener Natural organic thickener...Gum arabic, Sodium alginate Semi-synthetic organic thickener...Carboxylmethylcellulose Synthetic organic thickener...isobutylene-maleic anhydride copolymer, sodium polyacrylate, acrylic acid-vinyl alcohol copolymer, polyethylene oxide, vinyl alcohol- Maleic acid ester copolymer. As can be seen from the results in Table 1, gels containing an appropriate amount of thickener have a high air permeability recovery rate.
It is close to 100%, and the weight difference before and after washing is also large.
It can be seen that the cleaning power is great.

【table】

[Table] Example 2 A cleaning test was conducted using an actual belt press dehydrator. First, stop the sludge supply and wash it with water for a while using the dehydrator's cloth washing nozzle. As shown in the sectional view of the dehydrator in FIG. 1, the box-shaped member 1 is placed on the cloth 3. As shown in the plan view of the box-shaped member in Fig. 2, the side view in Fig. 3, and the front view in Fig. 4, the side plate is in contact with the cloth, and the front plate is in contact with the cloth with an appropriate gap. It is set aside. Apply the cleaning agent in the box member onto the cloth that is running idle at a cloth speed of 1 m/min. The cleaning agent is applied to the cloth at a constant thickness from the lower front gap of the box-shaped member. Although the cleaning agent is applied only to the lower cloth 3, the cleaning agent is also transferred to the upper cloth in the pressing section 5. 60
Wash with water after a minute. The washing time is 30 minutes, and the washing water volume is 0.2 m ³ /min. The experimental results were evaluated by air permeability tests before and after washing. The results are shown in Table-2. In Table-2,
The cleaning agent is the cleaning agent of Example 1 with 2.5% thickening agent.
It uses polyacrylate. From the results shown in Table 2, it was confirmed that the cleaning agent of the present invention is also effective in actual dehydrators.

〔Effect of the invention〕

According to the present invention, the following effects are produced. 1. Conventional cleaning agents are strong alkaline solutions that scatter onto the dehydrator and the human body, posing a risk of corrosion to the equipment and the human body.However, in the present invention, a thickening agent is added, making it easier to clean cloth. The scattering of the agent can be prevented, increasing safety. 2. With conventional solution-type cleaning agents, most of the cleaning agent flows away, but by adding a thickener, the cleaning agent can be retained on the fabric, reducing the amount of liquid used, making it economical. . 3. In the case of a belt press dehydrator, the cloth is coated using a fixed box-shaped member, so the coating is done automatically, and the cloth cleaning agent is transferred to the other cloth in the pressing section. Therefore, the application time was shortened. Approximately 30 to 60 minutes after application, the cleaning agent can be washed off with water using the cloth cleaning nozzle attached to the dehydrator, making the work easier than with conventional cleaning methods, and significantly reducing the number of workers and working time. can be reduced.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the belt press dehydrator, Figure 2
The figure is a plan view of the installation part of the box-shaped member, FIG. 3 is a side view of the installation part of the box-shaped member, and FIG. 4 is a front view of the installation part of the box-shaped member. 1... Box-shaped member, 2... String, 3... Lower cloth,
4...Upper cloth, 5...Compression part.

Claims (1)

[Scope of Claims] 1. A cleaning solution containing an alkali metal hydroxide as a main component, a natural type made from vegetable gum or seaweed, a semi-synthetic type made from cellulose, a vinyl type, an acrylic type, a polyethylene oxide type, or a polyvinyl alcohol type. A fabric cleaning agent characterized in that it is made into a gel by mixing an organic thickener selected from one or more of the synthetic systems consisting of the above-mentioned synthetic systems. 2. The cloth cleaning agent according to claim 1 is applied to at least one of the cloths of a belt press dehydrator, and transferred to the other cloth in the pressing section of the dehydrator, and after a certain period of time, the cloth is washed with water. A method for washing cloth in a belt press dehydrator, characterized by: 3 A box-shaped member with an open side opposite to the cloth running direction is arranged on the cloth of the belt press dehydrator, and the lower end of the box-shaped member on the cloth running direction side is separated from the cloth with an appropriate gap. 3. A cloth cleaning agent supply device for use in the cleaning method according to claim 2, further comprising an inlet for the cloth cleaning agent provided in said box-shaped member.