JP2004154712A - Method of disposing garbage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of promptly deodorizing garbage. <P>SOLUTION: The garbage 41 is crushed together with a waste water 1 containing a host of soil bacteria obtained in a step 10 of purifying the organic waste water 1 and then separated into a liquid portion 46 and a solid portion 47. The liquid portion 46 is subjected to deodorization in the step 10 of purifying the organic waste water 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for treating garbage suitable for use in food processing factories and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, the bad smell of garbage generated in large quantities in food processing factories and the like is well known as a factor that deteriorates daily living environment. Japanese Patent No. 3217654 (Patent Document 1) of the same applicant as the patent applicant of the present invention discloses a method of treating garbage that can eliminate malodor caused by garbage. In this treatment method, the garbage that has been pulverized and liquefied is mixed with sludge and stirred to reduce the BOD concentration of the garbage and then solid-liquid separated. The liquid portion obtained by the separation is led to a wastewater treatment step using the sludge, and is deodorized using the soil bacteria group and its metabolite in the wastewater treatment step.
[0003]
[Patent Document 1]
Japanese Patent No. 3217654 [0004]
[Problems to be solved by the invention]
In the above-mentioned known treatment method, tap water is added to garbage to pulverize and liquefy. The resulting liquefied product is sent to a high-concentration reaction step, where it is mixed with sludge having high bacterial activity and placed under the action of soil bacteria and its metabolites. Thereafter, the liquefied material is separated into primary treated water and solid sludge (dewatered cake). The primary treated water is led to a system for purifying organic wastewater, deodorized by the action of soil bacteria and its metabolites, and is discharged out of the system as secondary treated water. Since this method is a batch system suitable for processing garbage in ton units, if the system is to be operated economically and efficiently, the garbage will accumulate to an extent commensurate with the scale of the high-concentration reaction process. I have to wait for During that time, it is inevitable that odors will be generated from the garbage. In addition, a large amount of tap water is required to liquefy such an amount of garbage. Furthermore, since a large reaction vessel is used in the high concentration reaction step, a large space is required for the reaction vessel.
[0005]
The present invention relates to an improvement of the known method for deodorizing food waste, and to make it possible to quickly deodorize food waste when it is generated or to eliminate the need for tap water, The task is to reduce the space for storing garbage.
[0006]
[Means for Solving the Problems]
An object of the present invention for solving the problem is to purify organic wastewater under the action of soil bacteria on the liquid portion of the solid portion and the liquid portion generated by crushing garbage. This is a method for treating garbage that can be led to a system to deodorize the liquid portion.
[0007]
In this processing method, the features of the present invention are as follows.
The step is an activation step for the soil bacteria, in which a part of the drainage is taken out from the drainage channel in the step and brought into contact with humic substances, and then a part of the drainage is returned to the channel. A purification step of advancing a reaction between the wastewater and the soil bacteria in the flow path to separate and concentrate the wastewater into purified treated water and sludge; and forming a part of the wastewater and the sludge in the purification step into the raw water. In addition to the garbage, the garbage is crushed, and then the garbage is dewatered and separated into the solid portion and the liquid portion, and the liquid portion and the flow path before the purification step. A garbage treatment step of leading to any of the flow paths in the initial stage of the purification step.
[0008]
The present invention has the following preferred embodiments.
(1) In addition to the wastewater containing the sludge to the garbage, the treated water is added to crush the garbage.
(2) The garbage is dewatered so that the solid portion has a moisture content of 75 to 40% by weight.
(3) The solid portion is sent to a fermenter, and either the wastewater containing the sludge or the treated water is added to the solid portion for fermentation.
(4) A compost is obtained from the fermented solid part.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The details of the method for treating garbage according to the present invention will be described below with reference to the accompanying drawings.
[0010]
FIG. 1 is a flowchart of the garbage processing including the wastewater purification step 10 and the garbage processing step 40 according to the present invention. From a factory P such as a food processing factory, organic wastewater 1 and garbage 41 are generated. The wastewater 1 proceeds to the regulating tank 2 according to the drainage flow path of the purification step 10 extending from the left to the right in the drawing, and further proceeds to the separation / concentration tank 4 through the reaction tank 3. In the separation / concentration tank 4, the wastewater 1 that has been purified and deodorized has become treated water 6 and goes out of the purification step 10, while the solids contained in the wastewater 1 are concentrated to sludge. Part of the wastewater 1 in the separation / concentration tank 4 can be returned to the adjustment tank 2 or the reaction tank 3 together with sludge as required. The purification step 10 is accompanied by an activation treatment step 30 in which the first intermediate treatment water 12, which is a part of the wastewater 1 in the separation / concentration tank 4, is guided to the culture tank 7 together with sludge if necessary. A first mixed water 31 containing humic substances in the form of fine particles 9 (see FIG. 2) is supplied to the culture tank 7 from a humic substance supply device 8 juxtaposed thereto. In the culture tank 7, the first intermediate treated water 12 becomes the second mixed water 32 containing a large amount of soil bacteria having an active growth ability, and the second mixed water 32 is sent to the adjusting tank 2 and / or the reaction tank 3. . The second mixed water 32 may include sludge in which a large amount of active soil bacteria inhabit. The adjusting tank 2 may be called a pretreatment tank, the reaction tank 3 may be called a processing tank or an aeration tank, and the separation / concentration tank 4 may be called a sedimentation tank because sludge precipitates. For each of the tanks 2, 3, and 4, those well-known and used in the art can be used.
[0011]
FIG. 2 is a sectional view of the culture tank 7 and the supply device 8 in FIG. The first intermediate treated water 12 from the separation / concentration tank 4 and the first mixed water 31 from the supply device 8 are supplied to the culture tank 7. The culture tank 7 has an air diffuser 14 and a first water pipe 16, and mixes the first intermediate treatment water 12 and the first mixed water 31 under aerobic conditions by air supply from the air diffuser 14.
[0012]
The supply device 8 includes a water supply device 20, a hopper 22, a stirrer 24 driven by a motor 23, and a second water supply pipe 26 connected to the culture tank 7, and a water supply pump 27 is attached to the second water supply pipe 26. I have. The water supply device 20 is a water supply tank or the like, from which water for mixing 21 suitable for mixing with the first intermediate treatment water 12 in the culture tank 7 and growing soil bacteria is continuously or intermittently supplied. Supplied. One example of the mixing water 21 is the treated water 6 in FIG. The hopper 22 is loaded with fine particles 9 mainly composed of humic substances and inorganic substances, and the fine particles 9 are continuously or intermittently sent to the supply device 8 via a feeder 25. The water 21 and the fine particles 9 are mixed by the stirrer 24 to become the first mixed water 31 and sent to the culture tank 7 by the pump 27.
[0013]
In the culture tank 7, the first mixed water 31 and the first intermediate treatment water 12 are mixed and agitated under aerobic conditions together with the fine particles 9 by the action of the air diffuser 14 to form the second mixed water 32. The second mixed water 32 promotes the growth of soil bacteria contained in the second mixed water 32 and the activation of the metabolic function under such stirring, and purifies the wastewater 1 when the second mixed water 32 is mixed with the wastewater 1. The ability and the ability to deodorize are improved. The second mixed water 32 is sent to the adjustment tank 2 and / or the reaction tank 3 through the first water pipe 16.
[0014]
In such a supply device 8, as the fine particles 9, those made of a mixture of humic substances and inorganic substances, preferably having a particle size of 50 mesh or more are used. Inorganic substances, preferably mineral particles, more preferably silicate-containing mineral particles, even more preferably pumice, andesite, rhyolite, volcanic glass, zeolite, green tough, diatomaceous earth, minerals containing silicates such as clay minerals Particles are used. In the fine particles 9, the inorganic substance accounts for 50 to 90% by weight, and the organic substance mainly composed of the corrosive substance occupies the remaining part. The use amount of the fine particles 9 is preferably in the range of 0.05 to 3% by weight in the first mixed water 31. In addition, the first mixed water 31 is continuously or intermittently pumped by the pump 27 at about 0.5 / 1000 to 5/1000 of the amount of the first intermediate treated water 12 to be treated in the culture tank 7 per day. It is preferable to add to the treated water 12. As described above, the amount of the first mixed water 31 used is very small as compared with the amount of the first intermediate treated water 12, so that the internal volume of the supply device 8 is normally 0% of the internal volume of the culture tank 7. 0.5 to 1% is sufficient. However, in FIG. 2, in order to clearly show the structure of the supply device 8, the supply device 8 is shown to be approximately the same size as the culture tank 7. Further, the culturing tank 7 does not need to incorporate a container for filling humic substance pellets as in the prior art, so that a small internal volume is sufficient.
[0015]
Referring again to FIG. 1, the garbage 41 enters a garbage processing step 40 and is continuously or in a crusher 42 together with the second intermediate treated water 33 sent from the separation / concentration tank 4 and the treated water 6 added as necessary. The pulverized material 43 is intermittently processed. The second intermediate treated water 33 contains wastewater 1 and sludge, and the wastewater 1 and treated water 6 contain a large amount of soil bacteria capable of deodorizing the wastewater 1. As soon as it enters the pulverizing process, it becomes deodorized. The pulverized material 43 obtained thereafter is subjected to solid-liquid separation in a dehydrator 44 to be separated into a liquid portion 46 and a solid portion 47 having a water content of 75 to 40% by weight. The liquid portion 46 proceeds to the adjusting tank 2 in the purification step 10 and merges with the waste water 1, and is purified together with the waste water 1 to be deodorized.
[0016]
The solid portion 47 has a suitable moisture content for fermenting it. If this is fermented in the fermenter 48 as needed, it can be used as compost. The second intermediate treated water 33 and the treated water 6 can be supplied to the fermentation tank 48. The second intermediate treated water 33 and the treated water 6 can be used for promoting fermentation or sprayed into the fermentation tank 48. It can be used for preventing bad smell generated in the fermenter 48. In particular, the second intermediate treatment water 33 has a high utility value because it has a large number of soil bacteria having a strong proliferation ability in the sludge contained therein.
[0017]
In the present invention, in addition to the example of FIG. 1 in which the liquid portion 46 is guided to the adjustment tank 2 which is an initial flow path in the purification step 10, the liquid portion 46 is guided to a flow path between the adjustment tank 2 and the reaction tank 3. Alternatively, it can be guided to a flow path before the purification step 10. In order to supply the humic substances to the culture tank 7, a known or well-known means can be used in addition to the use of the supply device 8. For example, a container such as a basket filled with pellets containing humic substances may be provided inside the culture tank 7 so that the first intermediate treated water 12 comes into contact with the pellets when passing through the container. When the pellets are exhausted, refill the container with new pellets.
[0018]
In the method for treating garbage according to the present invention, for example, a small crusher 42 and a dehydrator 44 are used to crush and dewater garbage every time it is generated in kilograms. A large space is not required for installing the 42 and the dehydrator 44. The garbage 41 treated in this way immediately becomes a solid part with a very small apparent volume when it is generated. For example, the volume of the garbage can be reduced to about 1/3 before and after the pulverization, so that the space for storing the garbage 41 becomes almost unnecessary. Since the garbage 41 comes into contact with soil bacteria having a deodorizing ability in the pulverizing step, according to the present invention, it is possible to prevent malodor from the initial stage of garbage generation.
[0019]
【The invention's effect】
According to the method for treating garbage according to the present invention, even if garbage is generated, the garbage can be immediately crushed and dewatered while being brought into contact with soil bacteria, thereby eliminating the generation of malodor due to the garbage. Garbage can be processed by a small crusher and a dehydrator, and does not require a large space for processing the garbage.
[Brief description of the drawings]
FIG. 1 is a flowchart of garbage processing.
FIG. 2 is a sectional view of a culture tank and a supply tank.
[Explanation of symbols]
Reference Signs List 1 wastewater 6 treated water 10 purification step 30 activation step 40 garbage processing step 41 garbage 46 liquid part 47 solid part 48 fermenter

Claims (5)

It is possible to deodorize the liquid portion by guiding the liquid portion of the solid portion and the liquid portion generated by crushing the garbage to a step of purifying organic wastewater under the action of soil bacteria. In the method of processing garbage,
The step, an activation step for the soil bacteria, wherein a part of the drainage is taken out from the drainage channel in the step and brought into contact with humic substances, and then a part of the drainage is returned to the channel. A purification step of advancing a reaction between the wastewater and the soil bacteria in the flow path to separate and concentrate the wastewater into purified treated water and sludge; and forming a part of the wastewater and the sludge in the purification step into the raw water. In addition to the garbage, the garbage is crushed, and then the garbage is dewatered and separated into the solid portion and the liquid portion, and the liquid portion and the flow path before the purification step. A garbage treatment step of introducing the garbage to any of the initial flow paths in the purification step. The treatment method according to claim 1, wherein the garbage is pulverized by adding the treated water in addition to the wastewater containing the sludge to the garbage. The processing method according to claim 1, wherein the garbage is dewatered to make the water content of the solid portion 75 to 40% by weight. The treatment method according to claim 1, wherein the solid portion is sent to a fermenter, and either the wastewater containing the sludge or the treated water is added to the solid portion for fermentation. The processing method according to claim 4, wherein compost is obtained from the fermented solid portion.

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