JP2010265157A - Recycling method of surplus sludge and garbage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that the recycling of surplus sludge or garbage produced in food plant or the like conventionally requires large-scaled equipment and large fuel consumption, that is, a large quantity of carbon dioxide is produced, and malodor is caused by the method without necessitating them. <P>SOLUTION: The recycling method of the surplus sludge and the garbage is carried out by spreading the surplus sludge 1 or the garbage 2 of a waste water treatment by an activated sludge process on a dry field 3, and mixing and stirring them with the soil 4 of the dry field by a tilling means 5, thereby progressing a biological treatment in the dry field to make the surplus sludge and the garbage into fertilizer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for simultaneously recycling, for example, surplus sludge from wastewater treatment by an activated sludge method generated in a food manufacturing factory and raw garbage such as vegetable residues.

  For example, in a food manufacturing factory, surplus sludge and garbage from wastewater treatment by the activated sludge method are generated as waste that needs to be treated.

  Conventionally, surplus sludge generated in wastewater treatment by the activated sludge method is subjected to treatments such as dehydration and drying to make fertilizers as they are, or incineration to bury the ash. Patent Document 1 describes a method of drying sludge having a high water content such as sewage sludge, garbage, food waste, etc., and recycling it as a fuel for producing cement clinker.

  On the other hand, food waste generated in food factories, etc., is dried in the same way as excess sludge and then incinerated for landfill treatment or transported to a food waste treatment facility, where it is dried and treated with microorganisms. Or fertilizer is done. In addition to this, waste such as kitchen garbage has been piled up in fields, etc., and turned over as appropriate to fertilize with aerobic microorganisms.

  Further, in Patent Document 2, wastes such as excess sludge and residues derived from food production temporarily stored in the raw material storage are supplied to the mixing tank together with the seed agent supplied from the seed agent supply machine, and mixed. A large-scale device is described in which waste after mixing is aged in a ripening section consisting of a yard and a turning machine and recycled into organic fertilizers such as compost and soil / soil conditioners. In addition, this patent document 2 describes, as a conventional technique, a method in which waste is piled up in a field or the like, and this is appropriately turned back to a fertilizer or a soil / soil improvement agent that is fermented and decomposed by aerobic microorganisms.

Japanese Patent No. 4231737 JP-A-8-47700

Landfill processing without recycling waste as described above has the problem that effective use of resources cannot be achieved, and recycling in facilities with large-scale facilities is effective use of resources. Although it is preferable from the viewpoint, there is a problem that a large amount of energy such as fuel and electric power is consumed, resulting in the emission of carbon dioxide. Furthermore, in the method of stacking wastes in upland fields, etc., turning them back appropriately and converting them into fertilizers or soil / soil conditioners that are fermented and decomposed by aerobic microorganisms, the time until composting occurs with the problem of the generation of odors. There is a problem that it takes a long time.
It is an object of the present invention to solve such a problem.

  In order to solve the above-described problems, in the present invention, surplus sludge and garbage of wastewater treatment by the activated sludge method are spread on the field, and mixed and stirred together with the soil of the field by the plowing means, so that the microorganism treatment is performed in the field. We propose a method for recycling surplus sludge and food waste that is characterized by being fertilized.

  In the present invention, in the above configuration, the cultivating means can use a tractor provided with an attachment for cultivating as well as using a cultivator dedicated to cultivating.

  In the present invention, surplus sludge and garbage for wastewater treatment by the activated sludge method are spread on the field, and mixed and stirred together with the soil in the field by means of tillage, so that the aerobic microorganisms derived from the excess sludge and the soil-derived favorable With the use of aerobic microorganisms, so-called soil fungi, microbial treatment can be carried out well in the field and fertilized.

  As described above, in the present invention, surplus sludge and garbage are treated with microorganisms in the field. At this time, garbage that may generate a bad odor is mixed with surplus sludge and soil. Compared with the case where the microbial treatment is carried out by itself, it is effectively covered with excess sludge and soil, and the microbial treatment is performed very effectively, thereby effectively suppressing the generation of bad odor. be able to.

  Thus, after a predetermined period (for example, 3 to 6 months) has elapsed since the start of the treatment, and after surplus sludge and garbage have become fertilizer, fertilizer can be obtained by planting edible plants such as vegetables and beans in the field. Since the surplus sludge and garbage that have been converted to function as the original fertilizer, it is possible to perform very good cultivation with reduced or omitted additional fertilization and to fulfill the original function as a field.

  The air supply necessary for continuously performing the microbial treatment is performed well by mixing and stirring with the tillage means. As the tillage means, ordinary farm machinery such as a tiller or a tractor is used. be able to.

  As described above, in the present invention, a large-scale apparatus such as a treatment tank for treating excess sludge and garbage is not required, and the treatment can be performed with the field and ordinary agricultural machinery such as a tiller or a tractor. Therefore, the equipment cost is very low, and the consumption of fuel is very small because it is only in agricultural machinery and equipment, so the amount of carbon dioxide generated is also very small.

FIG. 1 is an explanatory view conceptually showing a method for recycling excess sludge and garbage according to the present invention.

Next, an embodiment of the method for recycling surplus sludge and garbage of the present invention will be described with reference to the accompanying drawings.
In the figure, reference numerals 1 and 2 indicate surplus sludge and garbage, respectively, of wastewater treatment by the activated sludge method generated at a food manufacturing factory. In this embodiment, the excess sludge 1 and the garbage 2 are generated in the same food manufacturing factory, but those with different generation points can be used.

  Reference numeral 3 denotes a field, and 4 denotes the soil. In the present invention, surplus sludge 1 and garbage 2 are spread on the field 3 and mixed and stirred together with the soil 4 of the field 3 by the tillage means 5. In this embodiment, the tillage means 5 has a structure in which a tillage attachment 7 is attached to a tractor 6.

  Thus, in the present invention, surplus sludge 1 and garbage 2 are spread on the field 3 and mixed and stirred together with the soil 4 of the field 3 by the cultivating means 5, so that the microorganism treatment is advanced in the field 3 and effective. Can be fertilized.

  At this time, the excess sludge 1 spread on the field 3 is preferably dehydrated to a water content of, for example, about 85% by a dehydrator, but may be the minimum necessary dehydration. The degree is appropriate.

  In the present invention, as described above, surplus sludge 1 and garbage 2 are microbially treated in the field 3. At this time, the garbage 2 that may generate a bad odor is mixed with the excess sludge 1 and the soil 2. Therefore, as compared with the case where the microorganism treatment is performed simply by stacking on the field 3, it is covered with the excess sludge 1 and the soil 4, and the microorganism treatment is performed very effectively. The generation of bad odor can be effectively suppressed.

  After the treatment is started, the surplus sludge 1, the garbage 2 and the soil 4 are operated by operating the tillage means 5 at an appropriate time interval, for example, about once or twice a day, or about once or twice a week. By cultivating the range of the field 3 where is mixed, it is possible to maintain the aerobic environment and continue the treatment with the aerobic microorganisms.

  After surplus sludge 1 and garbage 2 have become fertilizer after a predetermined period (for example, 3 to 6 months) in this way, if edible plants such as vegetables and beans are planted in field 3, surplus sludge that has been fertilized Since 3 and garbage 4 function as the original fertilizer, it is possible to perform very good cultivation by reducing or omitting the additional fertilization, and to fulfill the original function as the field 3. For example, in a certain example, even when the amount of chemical fertilizer used was reduced to 50% including the original fertilizer and the additional fertilizer, the same amount of vegetables could be produced.

  As described above, the supply of air necessary for continuously performing the microbial treatment is performed satisfactorily by operating the tillage means 5 appropriately every hour and mixing and stirring. Ordinary agricultural machinery such as a tractor or the like is used, so that the equipment cost is very low, and the fuel consumption is very little because it is almost only the tillage means 5, and therefore the amount of carbon dioxide generated is very little.

  The method for recycling surplus sludge and garbage of the present invention is optimally applied to a food manufacturing plant where both surplus sludge and garbage are generated, but can also be used when these are generated at different locations. Is.

DESCRIPTION OF SYMBOLS 1 Excess sludge 2 Garbage 3 Farmland 4 Soil 5 Tillage means 6 Tractor 7 Tillage attachment

Claims (4)

Excess sludge and waste from the wastewater treatment by the activated sludge method are spread over the field, and mixed and stirred together with the soil of the field by means of tillage, so that the microorganism treatment is advanced in the field and fertilized. And how to recycle garbage. The method for recycling excess sludge and garbage according to claim 1, wherein the tillage means is a tiller. The method for recycling surplus sludge and garbage according to claim 1, wherein the tillage means is a tractor. The method for recycling excess sludge and garbage according to claim 1, wherein the source of excess sludge and garbage is a food manufacturing factory.

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