JP2003225641A - Treatment method for cellulosic waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method which is capable of enhancing the efficiency of treatment and transportation by efficiently solidifying cellulosic waste such as fallen leaves and shredded paper waste by using a simple apparatus and prevents the generation of toxic gas, etc., even on the incineration. <P>SOLUTION: This treatment method for cellulosic waste contains of a moisture controlling process in which water is sprayed to the cellulosic waste such as fallen leaves and shredded paper waste and, thereby, the water content is controlled, a heating compression process in which the waste is stored into a press machine, is heated to a temperature of 200°C or more and, at the same time, is compressed to a prescribed volume, a shape fixing process in which the heating compression state is maintained for a given length of time and a cooling process in which the heating in the press machine is stopped and the cooling is performed by blowing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating cellulosic waste such as fallen leaves and cut paper dust, and more particularly to treating cellulosic waste such as fallen leaves and cut paper dust. The present invention relates to a treatment method that can be compacted to reduce the volume and reduce the waste treatment cost.

[0002]

2. Description of the Related Art Conventionally, leaves and cut paper dust are rarely reused, and most of them are treated by incineration as waste. In addition, these fallen leaves and cut paper waste are packed in plastic bags and transported to the incineration facility, but their volume is large relative to their weight and they are not convenient for collection and handling. In addition, the transportation efficiency is low and the processing cost is high. Reduction of waste treatment cost is a big problem for local governments.

[0003]

In order to solve such problems, there has been proposed a method of heating and compressing fallen leaves and cut paper dust to solidify them to improve the efficiency of collection and transportation. This is a technique in which a resin adhesive called a binder is mixed with fallen leaves and cut paper dust, and the mixture is heated and compressed to solidify.

However, the waste solidified with the binder as described above may generate toxic gas or the like when incinerated, and may not be suitable for incineration, or may not be decomposed naturally even in landfill. .

The present invention eliminates the above-mentioned drawbacks of the conventional method, and efficiently solidifies cellulosic waste such as fallen leaves and cut paper dust with a simple device to improve processing and transportation efficiency. It is intended to realize a treatment method that does not generate toxic gas and the like even when incinerated.

[0006]

In order to achieve the above objects, the method for treating cellulosic waste of the present invention comprises:
A water content adjustment process in which water content is adjusted by spraying water on cellulosic waste such as leaves and shredded paper dust, and this waste is stored in a press machine and heated to a temperature of 200 ° C. or higher and at a predetermined temperature. It comprises a heating compression step of compressing to a volume, a shape fixing step of maintaining this heating compression state for a certain time, and a cooling step of stopping heating of the press machine and cooling by blowing air.

Further, in the method for treating cellulosic waste of the present invention, when the cellulosic waste has a large amount of oil like coffee slag, the water content adjusting step is omitted. It facilitates solidification of waste.

In this way, water is sprayed on cellulosic waste such as leaves and cut paper dust to increase the water content,
When this is heated and compressed at a temperature of 200 ° C or higher, lignin that elutes from the waste can solidify fallen leaves and cut paper dust without the use of a binder, thus treating and transporting the waste. A processing method that reduces costs can be realized. Further, since no binder is used to solidify the waste, even if it is incinerated, no toxic gas is generated.

Here, setting the heating temperature of the press machine to 200 ° C. or higher promotes the action of lignin eluted from the waste, accelerates the drying of the compact and shortens the processing time required for solidification, This has the effect of increasing work efficiency.

Further, the method for treating cellulosic waste of the present invention can be applied not only to fallen leaves and cut paper dust, but also to coffee slag. In the case of waste containing a large amount of oil, such as coffee slag, it has a high calorie when burned and can be reused as fuel.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 is a process diagram showing an embodiment of the method for treating cellulosic waste of the present invention. In the figure, 1 is a moisture adjustment step, 2 is a heating compression step, 3 is a shape fixing step, and 4 is a cooling step.

In the water content adjusting step 1, water is sprayed on the collected fallen leaves to adjust the water content. At this time, the standard of the water content may be a rough one, and the target is a range of approximately 20 to 50%. Since the purpose is to treat waste, it is enough to moisten the whole fallen leaves and the like with a hose and moisten the whole. The higher the water content, the softer the waste becomes and the easier it is to consolidate, but it takes longer to dry and the treatment time becomes longer.

In the heating and compression step 2, a predetermined amount of fallen leaves and the like after the water content adjusting step 1 is put into a press machine, and the fallen leaves and the like are compressed to a predetermined volume while heating the entire press machine. The heating temperature at this time is selected to be 200 ° C. or higher. It is generally known that wood chips and the like cause discoloration when a temperature of 180 ° C. or higher is applied, but this is within the range where there is no problem in waste treatment as in the present application. As the heating temperature is raised, the binding reaction of lignin eluted from the waste can be promoted, the compacted body can be dried more quickly, and the entire processing time can be shortened.

In the shape-fixing step 3, after the fallen leaves and the like are compressed to a predetermined volume by the heat-compression step 2, the binding reaction by lignin is allowed to proceed while maintaining the heat-compressed state, and the compacted fallen leaves and the like. Wait for them to dry. The set time at this time is determined by the amount of leaves to be compressed, the water content thereof and the heating temperature, but is empirically determined as a condition for obtaining the minimum quality.

In the cooling step 4, after the shape fixing step 3, the entire press machine is cooled by blowing air from a fan or the like.

The compact thus cooled to such an extent that it does not hinder handling is taken out from the press and transported as compacted waste to an incinerator or the like.

Here, the experimental data when the fallen leaves were compacted into a columnar body of 20 × 50 × 200 mm was shown. The moisture content of the sample was in the range of 20 to 50%, the heating temperature was 200 ° C., and the shape fixing process was performed. Under the condition that 3 was 1 hour and the cooling time in the cooling step 4 was 30 minutes, a compact having sufficient hardness could be obtained.

It should be noted that the present invention is intended only for the treatment of waste, and the quality of the compacted product to be delivered may be simply such that it can be easily handled during transportation. There is no need to strictly control the temperature and the time for fixing the shape. An appropriate value is determined by giving priority to the efficiency of the entire processing work.

The thus-consolidated fallen leaves and the like are easy to handle, have high transportation efficiency, and can reduce the treatment cost for waste treatment. Further, since a binder is not used for solidification, no toxic gas is generated even if the binder is incinerated.

Further, the compacted body obtained by the present invention is
Since it has excellent heat insulation and sound insulation, it can be reused as fuel, heat insulating material, and soundproofing material.

Next, the case where the method for treating cellulosic waste of the present invention is applied to something like a coffee slag will be described. Food residues such as coffee slag can also be compacted by the same method as described above. However, in the case of waste containing a large amount of oil such as coffee slag, experimental results have shown that it is easier to solidify if the water content is not set too high. 1 is omitted, and the heating and compression process 2 and the subsequent steps are carried out while maintaining a relatively low water content.

It should be noted that the waste to be consolidated may be only food residues such as coffee grounds, but it is also possible to consolidate it even if wood chips or the like are mixed.

In the case of waste containing a large amount of oil, such as coffee slag, high calories can be obtained when it is burned, and it can be reused as fuel.

[0024]

As described above, in the method for treating cellulosic waste according to the present invention, the water content adjusting step of adjusting the water content by spraying water on the cellulosic waste such as leaves and cut paper dust. A heat compression step of accommodating this waste in a press machine and heating it to a temperature of 200 ° C. or higher and compressing it to a predetermined volume; a shape fixing step of maintaining this heat compression state for a certain time; Since it is equipped with a cooling process that stops heating and cools by blowing air, cellulosic waste such as fallen leaves and cut paper dust is efficiently solidified with a simple device to improve processing and transportation efficiency. In addition to the above, it is possible to realize a treatment method that does not generate toxic gas or the like even when incinerated.

In addition, in the method for treating cellulosic waste of the present invention, when the cellulosic waste has a large amount of oil such as coffee slag, the water content adjusting step may be omitted. Therefore, waste containing a large amount of oil, such as coffee slag, can likewise be compacted and can be reused as fuel or the like.

[Brief description of drawings]

FIG. 1 is a process diagram showing an embodiment of a method for treating cellulosic waste according to the present invention.

[Explanation of symbols]

1 Moisture control process 2 Heat compression process 3 shape fixed stroke 4 cooling process

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3K065 AA24 AB01 AC01 AC17 BA05                       CA03 CA08                 4D004 AA12 CA03 CA22 CA32 CA45                       CB15 CB31 CB37 DA02 DA03                       DA06 DA09

Claims (2)

[Claims] 1. A water content adjusting step of spraying water to cellulosic waste such as fallen leaves and cut paper dust to adjust the water content, and storing the waste in a press to a temperature of 200 ° C. or higher. A cellulosic system comprising a heating compression step of heating and compressing to a predetermined volume, a shape fixing step of maintaining this heating compression state for a certain time, and a cooling step of stopping heating of the press machine and cooling by blowing air. Waste treatment method. 2. The cellulosic waste according to claim 1, wherein the water content adjusting step is omitted when the cellulosic waste has a large amount of oil such as coffee slag. How to dispose of things.