JP2005247665A - Method of manufacturing ripened compost-like material and organic fertilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing ripened compost-like material by which a high grade ripened compost-like material is manufactured in a short period of time using organic waste except sludge as raw material without causing the sticking of the material to be treated to a treating apparatus. <P>SOLUTION: In the method of manufacturing the ripened compost-like material by drying, then heat-treating the organic waste except sludge while stirring it in a heat treatment apparatus, dried material of material originating from sludge is mixed with the organic waste except sludge at least in the heat-treatment. By the above method, the organic waste except sludge is not stuck to the heat treatment apparatus and therefore uniform heat conduction is performed through the whole material to be treated in the heat treatment and the efficient manufacture of the high grade ripened compost-like material is performed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing an aged compost-like material, and particularly relates to a method for producing an aged compost-like material containing organic waste other than sludge as a raw material. The present invention also relates to an organic fertilizer produced by the method.

  The applicant of the present application uses biologically treated sludge as a raw material, and heat-dried biologically treated sludge as a method for producing aged compost-like material that can be obtained in a short time by processing at a relatively low temperature, using organic fertilizer similar to aged compost. Then, a method characterized by heat treatment has been proposed (see Patent Document 1).

Specifically, in this method, biological treatment sludge generated in the biological treatment process of waste water or waste, such as sewage treatment sludge, surplus sludge or digested sludge, is heated and dried, for example, dry sludge having a water content of less than 1%. The heating is further continued at a temperature of 100 to 200 ° C. with respect to the dried sludge. According to this method, an aged compost-like material can be obtained in only about 10 to 20 hours until the end of the heat treatment step. Moreover, the aged compost-like material obtained in this way is an aged compost obtained by a per se known composting method in which organic waste is fermented over a long period of several tens to hundreds of days. Similarly, since there is almost no odor, the organic fertilizer component remains sufficiently, the salt content is not so high, and the handleability is excellent, there are advantages such as being useful as a high-quality organic fertilizer.
JP 2001-130990 A

  By the way, it replaces with sludge, and when it implements the method of the said patent document 1 by using organic waste other than that, for example, garbage, as a raw material, it is a process by the heating continuation at 100-200 degreeC after heat drying. It has been found that the object to be treated adheres to the stirring blade disposed in the tank or inside the treatment tank in a state of being burnt, which may hinder the production of the aged compost-like material. Specifically, the adherence of the deposits to the heat treatment apparatus causes non-uniform heat conduction to the object to be processed, resulting in a reduction in product quality. Moreover, if the treatment is repeated while leaving the deposits as they are, the deposits solidify and it becomes difficult to remove. Therefore, it is necessary to interrupt the treatment every predetermined time and frequently remove the deposits from the heat treatment apparatus.

  However, the adhering matter has a high viscosity, so that it is difficult to remove it manually, and a considerable time is required for the removing operation. For this reason, there existed problems, such as processing interruption time becoming long and processing efficiency falling.

  The above problems can be solved first by devising a method in which an object to be processed is less likely to adhere to a heat treatment apparatus. Second, when an object to be processed adheres to the heat treatment apparatus, it can be solved by obtaining a method capable of easily removing the object.

  The present invention has been made in view of the circumstances as described above, and can produce a high-quality aged compost-like material in a short time using organic waste other than sludge as a raw material, and a material to be processed into a heat treatment apparatus. An object of the present invention is to provide a method for producing an aged compost-like product that is free from adhesion.

  Another object of the present invention is to provide a method for producing an aged compost-like material that exhibits the effect of removing deposits.

  Furthermore, the present invention intends to provide an organic fertilizer that can be manufactured using organic waste other than sludge as a raw material without causing adhesion of the object to be processed to the heat treatment apparatus.

  In order to solve the above-described problems, the method for producing an aged compost-like material according to the present invention is a method for producing an aged compost-like material in which organic waste other than sludge is dried and then heat-treated with a heat treatment apparatus while stirring. At least during the heat treatment, the organic waste other than the sludge is mixed with a dried substance derived from sludge (Claim 1). Here, the “substance derived from sludge” may be sludge itself, or may be a sludge treatment product, for example, an aged compost-like product obtained by heat treatment after drying the sludge. good. Moreover, sludge and the processed product of sludge may be included.

  According to the present invention, the object to be processed does not adhere to the heat treatment apparatus. This is because the dried product of sludge-derived material is hardened by heat treatment, and is stirred together with organic waste other than sludge so that organic waste other than sludge adheres to the heat treatment device. It seems to be because it prevents it.

  In addition, since organic waste other than the sludge does not adhere to the heat treatment apparatus, heat conduction is uniformly performed throughout the object to be treated during the heat treatment. For this reason, organic waste other than sludge is used as a raw material, and it is useful as an organic fertilizer, that is, high-quality aged compost-like material, that is, no foul odor, sufficient organic fertilizer remains, and salt is not so high. A product similar to aged compost can be efficiently produced.

  Specifically, after drying the mixture of organic waste other than sludge and sludge-derived material, the mixture can be heat-treated with the heat treatment apparatus while stirring, or organic waste other than sludge. The product and the substance derived from sludge can be dried separately, and the dried product can be heat-treated with the heat treatment apparatus while mixing and stirring them.

  In the method for producing an aged compost-like material according to another embodiment of the present invention, a material to be treated containing sludge-derived material is attached to a heat treatment apparatus to which the material to be treated adheres by heat-treating organic waste other than sludge. And heat-treating with stirring (Claim 2). Here, the content of “substance derived from sludge” is the same as described above. In addition, the “object to be treated containing a sludge-derived substance” may be only a substance derived from sludge, or other substances such as sludge-derived substances, for example, organic waste other than sludge and its treatment It may be a mixture of products.

  Also by this production method, an aged compost-like product can be obtained which does not have a bad odor, has a sufficient amount of organic fertilizer and does not have a high salt content and is useful as an organic fertilizer.

  In addition, according to the manufacturing method, the object to be processed adhered to the heat treatment apparatus is removed cleanly. This is presumably because the sludge-derived substance becomes hard granular when it is heat treated, and when it is stirred by the heat treatment apparatus, it exerts an exfoliating action for deposits.

  In each of the above production methods, it is desirable that the ratio of the substance derived from the sludge is at least 5% by dry weight in terms of adhesion prevention effect (Claim 3).

  Moreover, in each said manufacturing method, the said heat processing while stirring can be performed at 100-200 degreeC (Claim 4).

  The organic fertilizer according to the present invention is obtained by drying a mixture of an organic waste other than sludge and a substance derived from sludge and then heat-treating it (claim 5). This organic fertilizer is suitable because it does not have a bad odor, the organic fertilizer remains sufficiently, and the salinity is not so high. In addition, no deposits adhere to the processing apparatus.

  The organic fertilizer according to another embodiment of the present invention is obtained by heat-treating a mixture of dried organic waste other than sludge and dried sludge-derived material (claim 6). .

  The said heat processing shall be performed at 100-200 degreeC, for example (Claim 7).

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic view of a heat treatment apparatus (manufacturing apparatus for an aged compost-like material) 20 suitable for carrying out the method for producing an aged compost-like material according to an embodiment of the present invention, and FIG. It is a systematic diagram of the manufacturing method of the aged compost-like thing which concerns on embodiment.

  First, the heat treatment apparatus 20 will be described with reference to FIG. The heat treatment apparatus 20 of FIG. 1 performs drying and heat treatment of the workpiece 10 by indirect heating. The heat treatment apparatus 20 includes a heating container 1 having a double-wall structure so that the heating medium 2 circulates, and the medium oil 2 is circulated through the circulation path of the heating container 1 so that an internal treatment target is provided. The object 10 is indirectly heated. The medium oil 2 is heated by the heat exchanger 3 and circulates in the circulation path of the heating container 1. The workpiece 10 is introduced from the upper inlet (not shown) of the heating container 1 and is agitated by the agitating blade 5 by the rotation of the rotating shaft 4 driven by the motor 6 or the like, and indirectly by the medium oil 2. Heated. The mature compost-like product as a product is taken out from the bottom outlet (not shown) of the heating container 1. On the other hand, the gas generated in the heating container 1 is exhausted out of the apparatus by the blower 7. The heat treatment apparatus 20 is provided with a temperature detection means 12 for detecting the temperature of the workpiece 10.

  In one embodiment of the present invention, as the object to be treated 10, a mixture of organic waste other than sludge and sludge-derived material is used. Examples of organic waste other than sludge include food waste and livestock excrement. In addition to the sludge-derived substances, sewage treatment sludge, surplus sludge, digested sludge, and the like, as well as biological treatment sludge generated in the biological treatment process of wastewater and waste, and its treated products, for example, the applicant of the present application are disclosed in Examples include aged compost-like materials proposed in Japanese Patent No. -130990. The aged compost-like material is obtained by heating and drying biologically treated sludge to form, for example, a dry sludge having a water content of less than 1%, and further heating the dried sludge at a temperature of 100 to 200 ° C. be able to. The substance derived from the sludge may be only sludge or only a treated product of sludge, or may contain sludge and its treated product.

  The mixture is heat-dried by the heat treatment apparatus 20 and then heat-treated by the heat treatment apparatus 20. That is, the temperature of the medium oil 2 is maintained at, for example, 150 to 200 ° C., and the mixture is indirectly heated while being stirred by the stirring blade 5 (drying step). After the water in the mixture gradually evaporates and the moisture content is less than 1% and the drying is completed, the heating is further continued at 100 to 200 ° C. (heat treatment step). And the temperature of the said mixture is detected with the said temperature detection means 12, and when it reaches predetermined temperature, a heating is stopped. The time required for the treatment is about 10 to 15 hours for the drying step and about 2 to 6 hours for the next heat treatment step.

  As a result of the treatment, there can be obtained an aged compost-like product useful as an organic fertilizer that does not have a foul odor, remains sufficiently organic fertilizer, and does not have a high salt content. In addition, according to the experiment, no deposits adhered to the heating container 1 and the stirring blade 5. This is because the sludge-derived substance is hard dried by being heated and dried and heat treated, and is stirred together with organic waste other than sludge, so that organic waste other than sludge is transferred to the heat treatment apparatus. This seems to be because it prevents adhesion. That is, the sludge-derived substance in the mixture itself is converted into a high-quality aged compost-like material, and organic waste other than the sludge is prevented from adhering to the heat treatment apparatus. Furthermore, the substance derived from the sludge contributes to uniform heat conduction in the heating container 1 by preventing the occurrence of deposits on the heat treatment apparatus 20, and as a result, organic waste other than the sludge. It also has the effect of helping to denature the product into a high quality aged compost-like product.

  In the above mixture, the mixing ratio of the organic waste other than sludge and the sludge-derived substance is preferably 95: 5 to 1:99 in terms of dry weight. That is, it is desirable that the ratio of the substance derived from the sludge in the mixture is at least 5% by weight of dry matter in order to remove the deposit.

  In the present embodiment, the case where drying and heat treatment are performed in the common heating container 1 has been described as an example, but it is also possible to perform them using separate apparatuses.

  Further, as another embodiment, the organic waste other than sludge and the sludge-derived material are separately dried, and the dried materials are mixed and heat-treated while stirring, similarly to the above. The following effects can be obtained. Anyway, it is only necessary that a dried product of sludge-derived material is mixed with organic waste other than the sludge at least during the heat treatment. Also in this case, it is desirable that the ratio of the substance derived from the sludge in the mixture is at least 5% by dry weight in view of the deposit removal effect. The specific method of drying and heat treatment may be the same as in the above embodiment.

  Next, a method for producing an aged compost-like material according to still another embodiment of the present invention will be described.

  The method for producing an aged compost-like material according to this embodiment can also be carried out using the heat treatment apparatus 20 of FIG. In the method for producing an aged compost-like material according to the present embodiment, an object to be treated containing sludge-derived material is supplied to a heat treatment apparatus to which the object to be treated is attached by heat treating organic waste other than sludge. Heat treatment is performed while stirring.

  For example, it is assumed that food waste as organic waste other than sludge is heat-dried and heat-treated under the same conditions as in the case of the mixture using the heat treatment apparatus 20 of FIG. In this case, the object to be processed may adhere to the heating container 1 or the stirring blade 5 in a state of being burnt. Then, after taking out the processed goods from the heating container 1, the to-be-processed object containing the substance derived from sludge is supplied to the said heat processing apparatus in the state which left the deposit | attachment, and it heat-processes, stirring. By doing in this way, the high-quality matured compost-like thing (organic fertilizer) similar to the above can be manufactured from the to-be-processed object containing the substance derived from sludge as a raw material. It is possible to cleanly remove the object to be treated. This is presumably because the substance derived from the sludge in the object to be treated exerts the action of peeling and removing the adhered substance adhering to the heat treatment apparatus 20.

  The content of “substance derived from sludge” is the same as described above. In addition, the “object to be treated containing a sludge-derived substance” may be only a substance derived from sludge, or other substances such as sludge-derived substances, for example, organic waste other than sludge and its treatment It may be a mixture of products. The ratio of the sludge-derived substance in the object to be treated is also preferably at least 5% by dry weight in order to prevent adhesion, as described above.

  The present invention will be described more specifically with reference to the following examples.

<Example 1>
Using the apparatus for producing an aged compost-like material shown in FIG. 1, processing was performed along the processing flow shown in FIG. 2. A to-be-processed object is a mixture of the concentrated sludge (300 kg, moisture content 75%) discharged | emitted from the agricultural settlement wastewater treatment facility, and garbage (30 kg, moisture content 85%). The set temperature of the medium oil is set to 200 ° C, and the processing is completed when the temperature of the object to be processed reaches 160 ° C through the heat drying process and the heat treatment process by continuous indirect heating while rotating the stirring blade. did. After natural cooling for 7 hours, the object to be treated was taken out of the heating container. The product obtained in a short time (aged compost-like product as an organic fertilizer) had no foul odor, had a moisture content of almost 0%, and was excellent in handleability.

  Further, when the inside of the heating container was confirmed after discharging the product, no deposits were found on the heating container or the stirring blade.

<Example 2>
On the first day, the garbage (100 kg, moisture content 90%) was treated using the apparatus for producing an aged compost-like material shown in FIG. The set temperature of the medium oil is set to 200 ° C, and the processing is completed when the temperature of the object to be processed reaches 160 ° C through the heat drying process and the heat treatment process by continuous indirect heating while rotating the stirring blade. did. After natural cooling for 7 hours, the object to be treated was taken out of the heating container. As a result, the obtained product had a lot of oil, had a slight odor, and the handling property was not so good. Further, when the inside of the heating container was confirmed after discharging the product, the object to be treated adhered to the inner wall of the heating container and the stirring blade, and the object to be treated was solidified on the floor surface of the heating container. It was carbonized.

  On the second day, sludge (200 kg, water content 80%) was obtained by dewatering the concentrated sludge discharged from the agricultural settlement drainage treatment facility using the apparatus for producing aged compost-like material shown in FIG. The set temperature of the medium oil is set to 200 ° C, and the processing is completed when the temperature of the object to be processed reaches 160 ° C through the heat drying process and the heat treatment process by continuous indirect heating while rotating the stirring blade. did. After naturally cooling for 5 hours, the object to be treated was taken out of the heating container. As a result, the obtained product had no foul odor, had a moisture content of almost 0%, and was excellent in handleability.

  After the discharge of the product, the inside of the heating container was confirmed, and on the first day, there were no deposits attached to the inner wall of the heating container and the stirring blade, and the floor surface of the heating container There was almost no solid deposit. Thereby, the deposit removal effect by the process of sludge was confirmed.

  In addition, in the processing of only the garbage on the first day of Example 2, a high-quality product was not obtained, whereas in the processing of the mixture of garbage and sludge in Example 1, a high-quality product was obtained. Thus, in Example 1, it can be seen that, as a result of the sludge preventing the generation of deposits, sufficient uniform heating of the object to be treated in the heating container was achieved.

It is the schematic of the heat processing apparatus suitable for implementing the manufacturing method of the ageing | curing | ripening compost-like thing which concerns on one embodiment of this invention. It is a systematic diagram of the manufacturing method of the aged compost-like thing which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating container 2 Medium oil 3 Heat exchanger 4 Rotating shaft 5 Stirring blade 6 Motor 7 Blower 10 To-be-processed object 12 Temperature detection means 20 Heat processing apparatus

Claims (7)

  A method for producing an aged compost-like material in which organic waste other than sludge is dried and then heat-treated with a heat treatment apparatus while stirring, and at least during the heat treatment, the organic waste other than sludge is a substance derived from sludge. A method for producing an aged compost-like product, characterized in that the dried product of is mixed.   Aged compost-like, characterized by supplying heat-treated materials containing sludge-derived materials to a heat-treating device that has been treated by heat-treating organic waste other than sludge, and performing heat treatment while stirring Manufacturing method.   The method for producing an aged compost-like material according to claim 1 or 2, wherein a ratio of the sludge-derived substance is at least 5% by dry weight.   The method for producing an aged compost-like material according to claim 1, 2 or 3, wherein the heat treatment with stirring is performed at 100 to 200 ° C.   Organic fertilizer that is made by heat-treating a mixture of organic waste other than sludge and sludge-derived materials.   Organic fertilizer obtained by heat-treating a mixture of dried organic waste other than sludge and dried sludge-derived material.   The organic fertilizer according to claim 5 or 6, wherein the heat treatment is performed at 100 to 200 ° C.

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