JP5879006B1 - Composting method using dehydrated cake - Google Patents

Abstract

[PROBLEMS] To obtain a dehydrated cake in which the fermentation accelerator is sufficiently mixed without waste without mixing the dehydrated cake more than necessary to mix the fermentation accelerator, and with the auxiliary materials while suppressing the decay of the dehydrated cake. To provide a composting method using dehydrated cake that is effectively and efficiently non-brominated compost. A dehydrator dehydrates sewage sludge and discharges a dehydrated cake containing a polymer flocculant to a belt conveyor, and a fermentation accelerator supply device stirs the fermentation accelerator of the granular material by a stirring member. It discharges | emits from a discharge port with a helical extrusion member, and the said fermentation promoter is the ratio of 50 kg-100 kg with respect to 1 cubic meter of said dehydration cake, and the said fermentation promoter is the upper surface side of the said belt conveyor, a left side surface side, and a right side surface. The belt that passes below the supply port within 1 minute after being discharged from the dehydrator by continuously supplying from a predetermined supply port provided on the upper surface side of the enclosure member that surrounds at least three sides of the enclosure A step of applying a fermentation accelerator on the upper surface of the dehydrated cake loaded on a conveyor, and a step of removing the dehydrated cake on which the fermentation accelerator has been applied. A step of sequentially discharging from the end in the traveling direction, dropping to a predetermined hopper and depositing to obtain a dehydrated dehydrated cake mixed with the fermentation accelerator, and dehydrating the dehydrated cake from the hopper by a predetermined vehicle A step of moving to a predetermined composting facility, a step of obtaining the compost raw material by mixing the deposited dehydrated cake and the auxiliary material in a mixing time within 7 minutes by a mixing device in the composting facility, and the compost raw material A composting method using a dehydrated cake having a step of composting at a rate of once every 6 to 8 days while promoting fermentation by the action of the fermentation promoter. [Selection] Figure 1

Description

  The present invention relates to a method of composting using a fermentation accelerator while suppressing decay of a dehydrated cake.

  As an effective use form of dewatered cake obtained by dewatering sewage sludge from sewage treatment facilities using dehydration equipment, it is composted with secondary materials using aerobic fermentation such as microorganisms in order to reduce it to the soil in a harmless form. There is a way to spray.

  It is known to mix fermentation accelerators with dehydrated cakes for odorless composting by aerobic fermentation of dehydrated cakes, but until now, even when fermentation accelerators are mixed with dehydrated cakes, malodor due to decay has occurred. There were many cases where I was troubled by doing.

  This is because dehydrated cakes must be thoroughly mixed with a fermentation accelerator for odorless composting, but if dehydrated cakes are kneaded more than necessary, they will harden and become lumps. It is difficult to break up such a lump during mixing, and the inside of the lump is anaerobic, so it is difficult to ferment and inhibit composting, and it will rot and generate a bad odor. Because.

  Therefore, the dehydrated cake must be thoroughly mixed with a fermentation accelerator for odorless composting, while avoiding the need to knead the dehydrated cake more than necessary to solidify it into a lump. Satisfying these two contradictory demands that it must not be a key to composting with secondary materials while suppressing the decay of dehydrated cake was a required technique.

  As a related technology, there is a technology in which livestock dung (cow dung) and a fermentation accelerator are simultaneously added to the input pit, urine is separated by a liquid-permeable transfer conveyor, and then transferred from the hopper to the fermentation / ripening room by another transfer conveyor. It is disclosed (see Patent Document 1).

  In addition, as a related technique, a dehydrated cake having a long side of 10 to 50 mm is crushed with a crusher and dropped during transfer of the belt conveyor, and the entire dehydrated cake immediately after the start of dropping is spread. As described above, a technique for efficiently deodorizing even a small amount of deodorizer by spraying a deodorizer having a droplet diameter of 1000 μm or less is disclosed (see Patent Document 2).

JP 2002-274986 A JP 2003-245691 A

However, in the technique disclosed in Patent Document 1 described above, animal dung is targeted, and the accumulated dung is not used as a polymer flocculant for separation from water, so that it is less sticky and the fermentation accelerator is mixed. It has the characteristic of being easy. On the other hand, sewage sludge is dehydrated by a dehydrator after adding a polymer flocculant (precipitating) agent for incineration, so that the volume of landfill is limited to about 1/5 by incineration. It becomes a dehydrated cake of about 70 to 85%, and it is not easy to mix the fermentation accelerator with the dehydrated cake coated with a polymer flocculant (water content of about 70 to 85%).
In addition, although the feces are not sticky and the fermentation promoters are easy to mix, the fermenter that can be mixed into the feces without being mixed well just by adding the livestock feces and the fermentation promoter into the input pit at the same time with the hopper As a result, there is a risk of uneven distribution and unevenness in the location where the fish is present, and it is kneaded by a screw conveyor such as a liquid-permeable transfer conveyor, and then the accumulated feces are moved so that the fermentation accelerator is mixed in various processes. Only a state in which the fermentation promoter is sufficiently mixed is ensured.
Here, as mentioned above, the dehydrated cake must be thoroughly mixed with the fermentation accelerator for odorless composting, while the dehydrated cake is kneaded more than necessary and solidified into a lump. There is a dilemma that must be avoided. Therefore, the technique disclosed in the above-mentioned Patent Document 1 is different from the present invention in target characteristics, and has an inhibiting factor when combined with other documents.
Furthermore, in the technique disclosed in the above-mentioned Patent Document 1, the urine and the like are separated by a liquid-permeable transfer conveyor after the animal stool and the fermentation accelerator are simultaneously added to the input pit by the hopper. Flowing out and the fermentation promoter is wasted and not efficient and economical.
In the technique disclosed in Patent Document 1 above, it does not fall from the end in the traveling direction of the belt conveyor (it is unclear from which direction it is dropped by what mechanism in the first place. If it falls from the end in the direction, it will not be deposited on a small transfer conveyor or fermentation / ripening room.), It is also inappropriate as a cited document, and has an obstruction factor when combined with other documents .

In addition, the technique disclosed in Patent Document 2 described above is intended only for temporary and superficial deodorization of the dehydrated cake, and the surface of the dehydrated cake cut into granules while being squeezed through a chopper-like machine It is not possible to cut off the source of malodor by simply spraying a deodorant on the surface. In other words, it is not a matter of promoting fermentation, that is, immersing microorganisms in the dehydrated cake, and fermenting and decomposing organic substances from the inside to make it non-brominated. It is inevitable that a bad odor will be generated when the value becomes high. Of course, it is difficult to prevent decay and reuse by composting with deodorants alone.
Furthermore, in the technique disclosed in the above-mentioned Patent Document 2, it is not enough to spray a deodorant only on a part of the dehydrated cake, such as the upper surface side, for the deodorizing effect. However, it is essential to increase the total surface area of the dehydrated cake and to spray fine droplets over the entire surface of the small mass. Therefore, a special device for crushing the dehydrated cake is required, which is expensive and complicated, and it takes time to spray the deodorant. Therefore, the technique disclosed in Patent Document 2 described above is completely different from the present invention in the method of preventing malodor, and has an inhibiting factor when combined with other documents.
In addition, spraying is possible when the deodorant is a liquid, but spraying is not always possible in the case of a granular material, and spraying is not necessarily the most suitable method, Since there is no deodorant, the deodorant scatters to the surroundings, and the inconvenience of contamination and waste is inevitable.

  The present invention is based on a high level of technology unique to companies with a track record in the background art field, and is at a high level that can be achieved by trial and error over several years after repeated verification tests in response to requests for cooperation from local governments. Boasting the reality and completeness of implementation that cannot be realized at the idea level.

  The object of the present invention is to obtain a dehydrated cake in which the fermentation accelerator is sufficiently mixed without waste without mixing the dehydrated cake more than necessary to mix the fermentation accelerator, while suppressing the decay of the dehydrated cake. It is to provide a composting method using dehydrated cake that is effectively and efficiently non-brominated compost together with auxiliary materials.

In the composting method using the first dewatered cake of the present invention, the dewatering device dewaters the sewage sludge and discharges the dewatered cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, the supply of the fermentation accelerator by continuously supplying from a predetermined supply port provided on the upper surface side of the enclosure member that surrounds at least three sides of the upper surface side, the left side surface side, and the right side surface side of the belt conveyor. A step of applying a fermentation accelerator onto the upper surface of the dehydrated cake loaded on the belt conveyor passing within 1 minute after being discharged from the dehydrator under the mouth;
The step of discharging the dehydrated cake on which the fermentation accelerator has been applied to the belt conveyor in order from the end in the traveling direction of the belt conveyor, dropping it onto a predetermined hopper and depositing it to obtain a deposited dehydrated cake mixed with the fermentation accelerator When,
Moving the deposited dewatered cake from the hopper to a predetermined composting facility by a predetermined vehicle;
In the composting facility, a step of obtaining a compost raw material by mixing the deposited dehydrated cake and the auxiliary material in a mixing time of 7 minutes or less by a mixing device;
A step of turning the compost raw material into compost by performing a turnover operation once every 6 to 8 days while promoting fermentation by the action of the fermentation accelerator.

By comprising in this way, the predetermined supply port provided in the upper surface side of the surrounding member of a belt conveyor with respect to the dewatering cake (about 70 to 85% of water content) containing the polymer flocculent loaded on the belt conveyor When the fermentation accelerator is continuously supplied from the end of the belt conveyor, the top surface on which the fermentation accelerator is added is randomly added when falling and depositing from the end in the direction of travel of the belt conveyor about a set of almost the same volume. It will be mixed inside the piled dehydrated cake, so there is no need to mix it by mixing work, and since the fermentation accelerator is mixed, the fermentation accelerator is mixed thoroughly without waste without kneading the dehydrated cake more than necessary. The dehydrated cake obtained can be obtained, and the non-brominated compost can be obtained effectively and efficiently together with the auxiliary materials while suppressing the decay of the dehydrated cake.
That is, when the dehydrated cake of the above-mentioned constant volume / unit is deposited to form the accumulated dehydrated cake, the dehydrated cake of the above-mentioned constant volume / unit is accumulated while rotating at various angles during the fall. As a whole, the sedimentary dehydrated cake as a whole will be stochastically and statistically always present with a certain amount of the above-mentioned constant volume / group of fermentation accelerators. It is possible to ensure that the fermentation accelerator is mixed and present in a wide dispersion (less biased) in the region. It is coated with a polymer flocculant and is widely dispersed (smallly biased) in various parts of the inside of the dehydrated cake in a buoyant state (water content of about 70 to 85%), and the fermentation accelerator is surely mixed. In order to ensure that it exists, the method of the present invention is preferred.
In addition, since the fermentation accelerator is applied to the top surface of the dehydrated cake within a short time within 1 minute after being discharged from the dehydrator, the effect of inhibiting spoilage is enhanced by the fermentation accelerator.
Moreover, since the fermentation accelerator supply device supplies the fermentation accelerator at a rate of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake, a dehydrated cake in which the fermentation accelerator is mixed without waste is obtained and is effective together with the auxiliary material. In addition, it can be efficiently made non-brominated compost. For example, if the ratio of the fermentation accelerator is 200 kg per 1 cubic meter of dehydrated cake, the burden of the fermentation accelerator becomes high, the running cost increases, and it is not economical and effective and efficient.
In addition, since the fermentation accelerator is applied to the top surface of the dehydrated cake loaded on the belt conveyor by the fermentation accelerator supply device, the fermentation accelerator is dropped, so that a small amount of fermentation accelerator can be supplied little by little.
In addition, the fermentation accelerator supply device discharges from the outlet through the spiral extrusion member while stirring the powder fermentation accelerator with the stirring member, thus avoiding inconvenience due to solidification of the powder and fermentation. The promoter can be continuously and smoothly supplied, and the fermentation promoter can be applied to the top surface of the dehydrated cake without waste.
In addition, since the fermentation accelerator is continuously supplied from a predetermined supply port provided on the upper surface side of the enclosure member that surrounds at least three sides of the upper surface side, the left side surface side, and the right side surface side of the belt conveyor, It is possible to add a fermentation accelerator to a dehydrated cake that is prevented from being scattered around, does not generate surrounding dirt, and is efficient without waste.
In addition, once the dehydrated cake is dropped and deposited in a predetermined hopper and obtained by mixing the fermentation accelerator, the dehydrated cake is moved from the hopper to a predetermined composting facility by a predetermined vehicle. The conventional problem that the rot of the dehydrated cake progresses while waiting for 8 hours to several days or more to move to a composting facility (where the fermentation accelerator is mixed) by a truck or the like has been solved. That is, immediately after discharging as a dehydrated cake from the dehydrator (even on the belt conveyor, within a few seconds to about 1 minute), the fermentation promoter is supplied by the fermentation promoter supply device installed in the existing sewerage treatment facility. It is a method to deal with the dewatered cake at the upstream stage before carrying it into the conventional composting plant equipment, and even in a small municipality class, it does not require excessive capital investment, and is economical at low cost .
In addition, by mixing the dewatered cake and the auxiliary material with the mixing device within 7 minutes, the dewatered cake is kneaded more than necessary for a long period of more than 7 minutes, and then solidified into a lump. Is avoiding.
In addition, the composting raw material is subjected to a turnover operation that is an agitation operation at a rate of once every 6 to 8 days, so that oxygen supplementation and fermentation / quality uniformity can be achieved. In addition, since the polymer flocculant is decomposed as the fermentation temperature rises, there is no fear that the dewatered cake is kneaded more than necessary and hardened into a lump by carrying out the turning-back operation as a stirring operation.
In addition, since dehydrated cake is composted with auxiliary materials and used as compost, landfill and incineration treatment is no longer necessary, and incineration equipment and fuel costs for incineration treatment of dehydrated cake has been a major problem in the past. It is possible to suppress such costs.

In the composting method using the second dewatered cake of the present invention, the dewatering device dewaters the sewage sludge and discharges the dewatered cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, supplying the fermentation accelerator continuously from a predetermined supply port to a space that passes through until the dewatered cake discharged from the end in the traveling direction of the belt conveyor is deposited on the hopper,
A step of adding the fermentation accelerator so as to be applied to the surface of the dehydrated cake discharged in order from the end in the traveling direction of the belt conveyor passing through the space within 1 minute after being discharged from the dehydrator. When,
The dehydrated cake coated with the fermentation accelerator falls onto the hopper and accumulates, and forms a dehydrated cake mixed with the fermentation accelerator;
Moving the deposited dewatered cake from the hopper to a predetermined composting facility by a predetermined vehicle;
In the composting facility, a step of obtaining a compost raw material by mixing the deposited dehydrated cake and the auxiliary material in a mixing time of 7 minutes or less by a mixing device;
A step of turning the compost raw material into compost by performing a turnover operation once every 6 to 8 days while promoting fermentation by the action of the fermentation accelerator.

Further, in the method for producing a deposited dehydrated cake mixed with the first fermentation accelerator of the present invention, the dehydrator dehydrates the sewage sludge and discharges the dehydrated cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, the supply of the fermentation accelerator by continuously supplying from a predetermined supply port provided on the upper surface side of the enclosure member that surrounds at least three sides of the upper surface side, the left side surface side, and the right side surface side of the belt conveyor. A step of applying a fermentation accelerator onto the upper surface of the dehydrated cake loaded on the belt conveyor passing within 1 minute after being discharged from the dehydrator under the mouth;
A step of discharging the dehydrated cake on which the fermentation accelerator has been deposited in order from the end in the traveling direction of the belt conveyor, and dropping and depositing the cake on a predetermined hopper.

By comprising in this way, the predetermined supply port provided in the upper surface side of the surrounding member of a belt conveyor with respect to the dewatering cake (about 70 to 85% of water content) containing the polymer flocculent loaded on the belt conveyor When the fermentation accelerator is continuously supplied from the end of the belt conveyor, the top surface on which the fermentation accelerator is added is randomly added when falling and depositing from the end in the direction of travel of the belt conveyor about a set of almost the same volume. It will be mixed inside the piled dehydrated cake, so there is no need to mix it by mixing work, and since the fermentation accelerator is mixed, the fermentation accelerator is mixed thoroughly without waste without kneading the dehydrated cake more than necessary. Dehydrated cake can be obtained.
That is, when the dehydrated cake of the above-mentioned constant volume / unit is deposited to form the accumulated dehydrated cake, the dehydrated cake of the above-mentioned constant volume / unit is accumulated while rotating at various angles during the fall. As a whole, the sedimentary dehydrated cake as a whole will be stochastically and statistically always present with a certain amount of the above-mentioned constant volume / group of fermentation accelerators. It is possible to ensure that the fermentation accelerator is mixed and present in a wide dispersion (less biased) in the region. It is coated with a polymer flocculant and is widely dispersed (smallly biased) in various parts of the inside of the dehydrated cake in a buoyant state (water content of about 70 to 85%), and the fermentation accelerator is surely mixed. In order to ensure that it exists, the method of the present invention is preferred.
In addition, since the fermentation accelerator is applied to the top surface of the dehydrated cake within a short time within 1 minute after being discharged from the dehydrator, the effect of inhibiting spoilage is enhanced by the fermentation accelerator.
Moreover, since a fermentation promoter supply apparatus supplies a fermentation promoter in the ratio of 50 kg-100 kg with respect to 1 cubic meter of dehydrated cake, the dehydrated cake with which the fermentation promoter was mixed without waste can be obtained. For example, if the proportion of the fermentation accelerator is 200 kg per 1 cubic meter of dehydrated cake, the burden of the fermentation accelerator becomes high, and the running cost increases, which is not economical.
In addition, since the fermentation accelerator is applied to the top surface of the dehydrated cake loaded on the belt conveyor by the fermentation accelerator supply device, the fermentation accelerator is dropped, so that a small amount of fermentation accelerator can be supplied little by little.
In addition, the fermentation accelerator supply device discharges from the outlet through the spiral extrusion member while stirring the powder fermentation accelerator with the stirring member, thus avoiding inconvenience due to solidification of the powder and fermentation. The promoter can be continuously and smoothly supplied, and the fermentation promoter can be applied to the top surface of the dehydrated cake without waste.
In addition, since the fermentation accelerator is continuously supplied from a predetermined supply port provided on the upper surface side of the enclosure member that surrounds at least three sides of the upper surface side, the left side surface side, and the right side surface side of the belt conveyor, It is possible to add a fermentation accelerator to a dehydrated cake that is prevented from being scattered around, does not generate surrounding dirt, and is efficient without waste.

In addition, in the method for producing a deposited dehydrated cake mixed with the second fermentation accelerator of the present invention, the dehydrator dehydrates the sewage sludge and discharges the dehydrated cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, supplying the fermentation accelerator continuously from a predetermined supply port to a space that passes through until the dewatered cake discharged from the end in the traveling direction of the belt conveyor is deposited on the hopper,
A step of adding the fermentation accelerator so as to be applied to the surface of the dehydrated cake discharged in order from the end in the traveling direction of the belt conveyor passing through the space within 1 minute after being discharged from the dehydrator. When,
The dehydrated cake coated with the fermentation accelerator falls onto the hopper and accumulates, and forms a dehydrated cake mixed with the fermentation accelerator;
Have

  According to the present invention, without mixing the dehydration cake more than necessary for mixing the fermentation accelerator, obtaining the dehydrated cake in which the fermentation accelerator is sufficiently mixed without waste, while suppressing the decay of the dehydrated cake It is possible to provide a composting method or the like using a dehydrated cake that is effectively and efficiently non-brominated compost together with the auxiliary material.

It is the schematic of the composting system using the dewatering cake in the 1st Embodiment of this invention. It is a figure which shows schematic structure of the fermentation promoter supply apparatus in the 1st Embodiment of this invention. It is a flowchart of the composting method using the dewatering cake in the 1st Embodiment of this invention. It is the schematic of the composting system using the dewatering cake in the 2nd Embodiment of this invention. It is a flowchart of the composting method using the dewatering cake in the 2nd Embodiment of this invention.

  Hereinafter, a composting method using a dehydrated cake according to the first embodiment of the present invention will be described with reference to the drawings.

  First, with reference to FIG. 1, the outline of the composting system for implementing the composting method using the dewatering cake in this Embodiment is demonstrated.

  As shown in FIG. 1, the composting system 100 implements composting of a compost raw material 60 including a deposited dehydrated cake 40 (a product in which the dehydrated cake 20 on which the fermentation accelerator 30 has been deposited) and a secondary material 50. Is. The dewatered cake 20 refers to a product obtained by separating the sewage sludge 10 generated in a sewerage treatment facility with a polymer flocculant and dewatering the water content to about 70 to 85% by the dewatering device 1.

  The composting system 100 includes a dewatering device 1 for dewatering the sewage sludge 10, a belt conveyor 2 as a conveying means for the dewatered cake 20, a fermentation accelerator supply device 3, a hopper 4, a vehicle 5, and a composting facility 6. And a mixing device 7 for mixing the deposited dehydrated cake 40 and the auxiliary material 50.

  A sewage sludge 10 is put into a dewatering apparatus 1 such as a known belt press dewatering machine or a centrifugal dewatering machine, and a dewatering cake 20 is rotated from the dewatering apparatus 1 in a forward direction by a drive motor (not shown). The width is about 40 cm to 100 cm, for example). The fermentation promoter supply device 3 supplies and adds the fermentation promoter 30 to the upper surface of the dehydrated cake 20 from above the dehydrated cake 20 loaded on the belt conveyor 2. The dehydrated cake 20 is discharged in order from the end of the belt conveyor 2 in the traveling direction, dropped onto the hopper 4 (a known dehydrated cake storage hopper or the like), accumulated, and the accumulated dehydrated cake mixed with the fermentation accelerator 30. Get 40. The accumulated dewatered cake 40 discharged from the hopper 4 to the loading platform of the vehicle 5 such as a 4t truck is moved to the composting facility 6 by the vehicle 5 and mixed with the auxiliary material 50 by the mixing device 7 to become a compost raw material 60, which is composted. Composted by aerobic fermentation at the facility 6.

  As the fermentation accelerator 30, for example, “soil-up” of a granular material manufactured by Greentex Co., Ltd. may be used. The fermentation accelerator 30 can realize high-temperature fermentation by an aerobic fermentation action of microorganisms, non-bromide, shortening, and composting at low cost.

Referring to FIG. 2 showing an example of the configuration of the fermentation accelerator supply device 3, a large amount of the fermentation accelerator 30 can be introduced from the opened upper portion, and the fermentation accelerator 30 is attached to the motor rotation shaft. While stirring so as not to be solidified by the stirring member 301, it is gradually moved by the spiral pushing member 302 attached to the motor rotation shaft in the vicinity of the bottom, and is discharged from the discharge port 303 and supplied. In addition, the auxiliary | assistant discharge part 304 which discharges | emits the fermentation promoter 30 which overflowed may be provided.
For example, by turning a dial (not shown), the fermentation promoter supply apparatus 3 can adjust the discharge amount / supply amount of the fermentation promoter by changing the opening area of the discharge port portion 303 by a physical mechanism. It may be. As an example, the amount of fermented accelerator discharged and supplied is when the dehydrator 1 is used to discharge the dehydrated cake 20 of about 0.5 cubic meters per hour according to the width and speed of the belt conveyor 2. , When the belt conveyor 2 is transporting / discharging the same amount of dehydrated cake 20 of about 0.5 cubic meters per hour, the discharge port portion 303 can supply 50 kg to 100 kg of the fermentation accelerator in 2 hours. Adjust to the size of the open area. When the water content of the dehydrated cake 20 is about 70 to 85%, when the volume of the dehydrated cake 20 is about 1 cubic meter, the specific gravity based on water is about 0.95, and thus it is about 1 t. The reason why the amount of the fermentation accelerator 30 is 50 kg to 100 kg with respect to about 1 cubic meter of the dehydrated cake 20 is not only low cost and economical, but also the result of odorless composting in the demonstration experiment. In addition, if the fermentation accelerator 30 reaches 200 kg, the burden on the fermentation accelerator 30 becomes high, the running cost increases, and it is not economical and effective and efficient. In addition, since it is not realistic if processing speed is too slow as a processing speed, it is desirable that a fermentation promoter can be supplied to a dehydrated cake of at least about 2 to 3 cubic meters per day.
In addition, the fermentation promoter supply device 3 can be remotely operated in a predetermined management room. If the belt conveyor 2 operates, the fermentation promoter supply device 3 starts to operate, and the operation of the belt conveyor 2 stops. The fermentation accelerator supply device 3 may also be controlled to stop its operation.

As shown in FIG. 2, the belt conveyor 2 may be surrounded by a surrounding member 201 that surrounds at least three sides of the upper surface side and the left and right side surfaces. The enclosure member 201 is provided with a supply port portion 202 that opens corresponding to the discharge port portion 303 of the fermentation promoter supply apparatus 3 and a supply port portion 203 that opens corresponding to the auxiliary discharge port portion 304. The enclosing member may be a cylinder or a cylinder that surrounds the four sides. Materials such as metal and resin are widely applicable.
By comprising in this way, in order to prevent the fermentation promoter 30 from scattering to the circumference, it is possible to add the fermentation promoter 30 to the dehydrated cake 20 efficiently without generating surrounding dirt and without waste. Become.

  The composting facility 6 is not limited to the inside of a building, and even if it is a large site itself (with a roof) of a predetermined facility, a plate-like body provided with a drain hole is laid on the site. Also good. The compost raw material 60, which will be described later, is aerobically fermented and composted on the large site. The moisture adjustment may be performed by dripping moisture from a drain hole provided in the plate-like body.

  The mixing device (mixer) 7 includes a mixing mechanism such as a screw mechanism and predetermined input / exhaust ports.

  Next, with reference to the flowchart of FIG. 3, the flow of the composting method using the dewatered cake in the present embodiment will be described in detail.

  First, sewage sludge 10 containing a polymer flocculant is put into the dewatering device 1 of the dewatering cake composting system 100 (step S1).

  Then, the dehydrated cake 20 containing the polymer flocculant discharged from the dehydrator 1 to the belt conveyor 2 is conveyed by the belt conveyor 2 (step S2). In addition, as long as it functions as a conveying means, various well-known techniques may be applied without being limited to the belt conveyor.

And with respect to the dewatering cake 20 currently conveyed by the belt conveyor 2, the fermentation promoter supply apparatus 3 arrange | positioned above the belt conveyor 2 accelerates | stimulates fermentation on the upper surface side of the dewatering cake 20 currently loaded on the belt conveyor 2. An agent 30 (for example, “soil up” of a granule manufactured by Greentex Co., Ltd.) is supplied and added (step S3).
More specifically, the fermentation accelerator supply device 3 discharges the powdery fermentation accelerator 30 from the discharge port 303 by the spiral pushing member 302 while stirring the granular fermentation accelerator 30 by the stirring member 301, and the dehydrated cake 20 is 1 cubic meter. The supply port 202 provided on the upper surface side of the enclosure member 201 that surrounds at least three sides of the fermentation promoter 30 in the ratio of 50 kg to 100 kg and the upper surface side, the left side surface, and the right side surface of the belt conveyor 2. Is continuously supplied from above, the fermentation accelerator 30 is applied to the upper surface of the dewatered cake 20 loaded on the belt conveyor 2 that passes within 1 minute after being discharged from the dehydrator 1 below the supply port 202. To get down.
In this way, the fermentation accelerator supply device discharges from the discharge port by the spiral extrusion member while stirring the fermentation accelerator of the granular material by the stirring member, thus avoiding the inconvenience due to the solidification of the granular material. The fermentation accelerator can be continuously and smoothly supplied, and the fermentation accelerator can be applied to the top surface of the dehydrated cake without waste.
In addition, since the fermentation accelerator 30 falls on the upper surface of the dehydrated cake 20 within a short time within 1 minute after being discharged from the dehydrator 1, the fermentation accelerator 30 is more effective in suppressing spoilage. ing.
Moreover, since the fermentation promoter 30 is applied to the top surface of the dehydrated cake 20 loaded on the belt conveyor 2 by the fermentation promoter supply device 3 so as to be sprinkled, a small amount of the fermentation promoter 30 is continuously supplied little by little. be able to.
The supply of the fermentation accelerator 30 by the fermentation accelerator supply device 3 is not limited to falling, and may be realized by various methods such as ejection. The supply of the fermentation promoter 30 by the fermentation promoter supply device 3 may be continuous or discontinuous. Arrangement | positioning of the fermentation promoter supply apparatus 3 is an example, and as long as a fermentation promoter is added to a part or all of the surface area | region of the dewatering cake 20, what kind of position may be sufficient as it.

Then, the dewatered cake 20 on which the fermentation accelerator 30 is applied is discharged and dropped sequentially from the end in the traveling direction of the belt conveyor 2 (step S4), and the dropped dehydrated cake 20 is a hopper with the bottom and the like closed. 4 is received and deposited (step S5) to form a dehydrated dehydrated cake 40 mixed with the fermentation accelerator 30 (step S6).
Thereby, it is not necessary to perform a mixing operation in order to mix the fermentation accelerator 30 in the accumulated dewatered cake 40. In addition, when falling and depositing from the end in the traveling direction of the belt conveyor 2 in a unit of a certain volume, the upper surface side to which the fermentation accelerator 30 has been added is randomly placed inside the accumulated dehydrated cake 40. It is not necessary to bother mixing by the mixing operation, and since the fermentation accelerator 30 is mixed, the dehydration cake 20 is not mixed more than necessary and the fermentation accelerator 30 is sufficiently mixed without waste. The cake 20 can be obtained, and the non-brominated compost can be obtained effectively and efficiently together with the auxiliary material while suppressing the decay of the dehydrated cake 20.
That is, when the dehydrated cake 20 for each of the above-mentioned fixed volume / unit is deposited to form the accumulated dehydrated cake 40, the dehydrated cake 20 for each of the above-mentioned fixed volume / unit is accumulated while rotating at various angles during the fall. Even if the accumulated dehydrated cake 40 is taken as a whole, the fermentation accelerator 30 is regularly present for each of the above-mentioned constant volume and unit parts in a stochastic and statistical manner. It is possible to ensure that the fermentation accelerator 30 is mixed and present in a wide manner (with little bias) widely in various parts throughout. It is coated with a polymer flocculant and is widely dispersed (smallly biased) in various internal parts throughout the entire piled dehydrated cake 40 in a buoyant state (moisture content of about 70 to 85%). It is preferable to use the method of the present embodiment to ensure that it exists.

  When a predetermined amount of accumulated dewatered cake 40 is accumulated in the hopper 4, the bottom of the hopper 4 is opened and the accumulated dehydrated cake 40 is discharged from the hopper 4 to the loading platform of the vehicle 5 such as a 4 t dump truck. 5 moves to a predetermined composting facility 6 and discharges the accumulated dewatered cake 40 from the carrier to a predetermined location of the composting facility 6 (step S7). It may be discharged directly to a charging port or the like of the mixing device 7 described later. Conventionally, for example, the dehydrated cake 20 that has been dehydrated at 8:00 AM takes time such that it cannot be moved from the hopper 4 by the vehicle 5 until PM 16:00 is reached. In some cases, it took several days for the vehicle 5 to move. In the meantime, irreversible rot of the dehydrated cake 20 has progressed and hindered odorless composting. According to the present embodiment, the accumulated dehydrated cake 40 mixed with the fermentation accelerator 30 is originally used. Therefore, the promotion of fermentation has begun, and such inconvenience has been eliminated.

The accumulated dewatered cake 40 and the auxiliary material 50 are introduced from a predetermined inlet of the mixing device 7 installed in the composting facility 6, and the mixing device 7 mixes the accumulated dehydrated cake 40 and the auxiliary material 50 within 7 minutes. Then, they are mixed by a screw mechanism or the like and discharged from a predetermined outlet as a compost raw material 60 (step S8). The reason why the mixing time is set to a short time of 7 minutes or less is that if it is a long time, the dehydrated dehydrated cake 40 tends to be kneaded more than necessary and hardened into a lump. In addition, since the fermentation accelerator 30 is mixed in the accumulated dewatered cake 40 in advance, it is only necessary to consider sufficient mixing of the accumulated dehydrated cake 40 and the auxiliary material 50, and the fermentation accelerator 30 is added separately at this stage. It is not necessary to consider mixing the fermentation accelerator 30 with the entire compost raw material 60 as in the case of doing so, and therefore the mixing time can be as short as 7 minutes or less. Of course, by achieving sufficient mixing of the deposited dehydrated cake 40 and the auxiliary material 50, the fermentation accelerator 30 is inevitably mixed with the entire compost raw material 60.
The amount of the auxiliary material 50 is about 2.5 to 3.5 cubic meters with respect to the accumulated dehydrated cake 40 of about 1 cubic meter (if the ratio is 1: 1, the fermentation temperature rises, but the temperature suddenly rises in the middle) Is inconvenient. The auxiliary material 50 is sawdust, rice crackers, wood chips, straws, and the like, and is crushed and pulverized as necessary to have a particle shape of 5 to 8 mm or less. When it is reduced to 5 to 8 mm or less, the particle shape is uniform, and the use of compost becomes wide. The auxiliary material 50 has a role as a moisture adjusting agent and a role that raises the fermentation temperature to promote fermentation and does not generate malodor.

The compost raw material 60 discharged from the mixing device 7 is deposited in a predetermined place of the composting facility 6, and the fermentation is promoted by the action of the fermentation accelerator 30 mixed in the dehydrated cake 40, and 6 to Composting is carried out while carrying out a turnover operation at a rate of once every 10 days (step S9). We will carry out turnover, which is an agitation operation, by manual operation or an agitator such as an excavator loader, etc., to achieve oxygen supplementation and uniform fermentation and quality.
The internal temperature (fermentation temperature) of the compost raw material 60 gradually increases by fermentation. When the fermentation temperature is 50 ° C. or higher, the growth of bacteria suitable for aerobic fermentation and the decrease of anaerobic bacteria occur in the process, and the occupation rate of aerobic bacteria increases. In the fermentation process in the above step S10, the fermentation temperature becomes about 60 ° C. after 2 days, and the fermentation temperature becomes about 60 ° C. to 75 ° C. in the following 15 to 20 days. ), Parasite eggs, and weed seeds that adversely affect crops.
As the fermentation temperature rises, the polymer flocculant is also decomposed, so there is no fear that the dewatered cake will be kneaded more than necessary and hardened into a lump by carrying out the reversing operation as a stirring operation.
The compost raw material 60 finishes fermentation (primary fermentation) in about 20 days (fermentation period). A temperature detection device for detecting the temperature inside the compost raw material 60 is arranged, and the detection signal is transmitted to a predetermined control device constituted by a microcomputer or the like, and the completion of the primary fermentation is detected according to the transition of the detected temperature. It may be.
Further, the compost raw material 60 is transferred to a predetermined aging tank or deposited as it is in the composting facility 6 and is ripened (secondary fermentation) for about 20 days (ripening period). When the ripening period ends, composting of the compost raw material 60 is completed, and the compost 70 can be obtained.
Further, the compost 70 may be dried for about 20 days (drying period), and then the dried compost 70 may be stored in a predetermined storage room or the like. Further, the compost 70 may be packed in a bag or sold as a pellet.

The non-brominated compost 70 obtained by completing the composting of the compost raw material 60 is hygienic and safe due to the high decomposition rate of organic substances and the progress of ripening, and improves the soil balance. It is a high quality organic product that nurtures the original power of crops.
In addition, since the dehydrated cake 20 that forms a part of the compost raw material 60 is composted and used, landfill / incineration is not necessary, and the incineration of the dehydrated cake 20 has been a big problem in the past. Costs such as incineration facilities and fuel costs can be reduced.

  According to the above-described embodiment, the dehydrated cake must be sufficiently mixed with a fermentation accelerator for odorless composting, while the dehydrated cake is kneaded more than necessary and solidified into a lump. It is possible to meet the contradictory requirement that it must be avoided, and since the fermentation accelerator is mixed, the dehydrating cake was not kneaded more than necessary, and the fermentation accelerator was sufficiently mixed without waste It is possible to obtain a dehydrated cake and to effectively and efficiently produce a non-brominated compost together with auxiliary materials while suppressing the decay of the dehydrated cake.

Next, a composting method using a dehydrated cake according to the second embodiment of the present invention will be described with reference to the drawings.
Since it is basically the same as that of the first embodiment described above, differences will be mainly described and overlapping description will be omitted.

  First, with reference to FIG. 4, the outline of the composting system for implementing the composting method using the dewatering cake in this Embodiment is demonstrated.

As shown in FIG. 4, the fermentation promoter supply device 3 ′ of the composting system 100 ′ ejects and supplies the fermentation promoter 30 from the discharge port. Note that the direction in which the fermentation accelerator 30 is ejected is preferably toward the hopper 4.
That is, the fermentation accelerator supply device 3 ′ passes through the dehydrated cake 20 that is discharged from the end in the traveling direction of the belt conveyor 2, discharged into the air, and dropped and received by the hopper 4 and accumulated. The fermentation promoter 30 is sprayed in the space.
The supply of the fermentation accelerator 30 to the space by the fermentation accelerator supply device 3 ′ is not limited to spraying and may be realized by various methods.
The arrangement of the fermentation accelerator supply device 3 ′ may be any position as long as the fermentation accelerator 30 is added to a part or all of the surface area of the dehydrated cake 20.

  Next, with reference to the flowchart of FIG. 5, the characteristic of the flow of the composting method using the dewatering cake in this Embodiment is demonstrated.

  The fermentation accelerator supply device 3 ′ is in a space through which the dehydrated cake 20 discharged from the end in the traveling direction of the belt conveyor 2, discharged into the air and dropped is received by the hopper 4 and accumulated. The fermentation promoter 30 is sprayed (step S13).

  And the dewatering cake 20 is discharged | emitted in order from the edge part in the advancing direction of the belt conveyor 2, is discharge | released toward the air | atmosphere of the upper part or the downward direction, and falls (step S14), and the discharged | dehydrated cake 20 discharged | emitted the fermentation promoter 30 When passing through the containing space, the fermentation accelerator 30 is added so as to be applied to a part or all of the surface area of the dehydrated cake 20 (step S15), and the dehydrated cake 20 that has fallen is received by the hopper 4 and deposited (step). (S16) A dehydrated dehydrated cake 40 mixed with the fermentation accelerator 30 is formed (step S17). The belt conveyor 2 may be surrounded by a surrounding member 201 that surrounds at least three sides of the upper surface side and the left and right side surfaces. With this configuration, a large amount of the fermentation accelerator 30 is added to the belt conveyor 2. The influence by adhering to can be avoided.

  In addition, although not illustrated one by one, the present invention may be implemented with various modifications within a range not departing from the gist thereof. That is, when the dehydrated cake is deposited, the portion to which the fermentation accelerator is added in advance is randomly mixed inside the accumulated dehydrated cake, so that it is not necessary to mix the fermentation accelerator in the subsequent process by mixing work. As long as it includes a wide variety of embodiments.

DESCRIPTION OF SYMBOLS 1 Dehydrator 2 Belt conveyor 3, 3 'Fermentation promoter supply device 4 Hopper 5 Vehicle 6 Composting facility 7 Mixing device 10 Sewage sludge 20 Dehydrated cake 30 Fermentation accelerator 40 Dehydrated cake 50 Secondary material 60 Compost raw material 70 Compost 100, 100 'Composting system 201 Fencing member 202 Supply port portion 203 Supply port portion 301 Stirring member 302 Extruding member 303 Discharge port portion 304 Auxiliary discharge port portion

Claims (4)

A dewatering device dewatering the sewage sludge and discharging the dewatered cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, the supply of the fermentation accelerator by continuously supplying from a predetermined supply port provided on the upper surface side of the enclosure member that surrounds at least three sides of the upper surface side, the left side surface side, and the right side surface side of the belt conveyor. A step of applying a fermentation accelerator onto the upper surface of the dehydrated cake loaded on the belt conveyor passing within 1 minute after being discharged from the dehydrator under the mouth;
The step of discharging the dehydrated cake on which the fermentation accelerator has been applied to the belt conveyor in order from the end in the traveling direction of the belt conveyor, dropping it onto a predetermined hopper and depositing it to obtain a deposited dehydrated cake mixed with the fermentation accelerator When,
Moving the deposited dewatered cake from the hopper to a predetermined composting facility by a predetermined vehicle;
In the composting facility, a step of obtaining a compost raw material by mixing the deposited dehydrated cake and the auxiliary material in a mixing time of 7 minutes or less by a mixing device;
Composting using a dehydrated cake having a step of turning the compost raw material at a rate of once every 6-8 days while promoting fermentation by the action of the fermentation accelerator, and composting Method. A dewatering device dewatering the sewage sludge and discharging the dewatered cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, supplying the fermentation accelerator continuously from a predetermined supply port to a space that passes through until the dewatered cake discharged from the end in the traveling direction of the belt conveyor is deposited on the hopper,
A step of adding the fermentation accelerator so as to be applied to the surface of the dehydrated cake discharged in order from the end in the traveling direction of the belt conveyor passing through the space within 1 minute after being discharged from the dehydrator. When,
The dehydrated cake coated with the fermentation accelerator falls onto the hopper and accumulates, and forms a dehydrated cake mixed with the fermentation accelerator;
Moving the deposited dewatered cake from the hopper to a predetermined composting facility by a predetermined vehicle;
In the composting facility, a step of obtaining a compost raw material by mixing the deposited dehydrated cake and the auxiliary material in a mixing time of 7 minutes or less by a mixing device;
Composting using a dehydrated cake having a step of turning the compost raw material at a rate of once every 6-8 days while promoting fermentation by the action of the fermentation accelerator, and composting Method. A dewatering device dewatering the sewage sludge and discharging the dewatered cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, the supply of the fermentation accelerator by continuously supplying from a predetermined supply port provided on the upper surface side of the enclosure member that surrounds at least three sides of the upper surface side, the left side surface side, and the right side surface side of the belt conveyor. A step of applying a fermentation accelerator onto the upper surface of the dehydrated cake loaded on the belt conveyor passing within 1 minute after being discharged from the dehydrator under the mouth;
A step of discharging the dewatered cake on which the fermentation accelerator has been deposited in order from the end in the traveling direction of the belt conveyor, and dropping and depositing the cake on a predetermined hopper. Manufacturing method. A dewatering device dewatering the sewage sludge and discharging the dewatered cake containing the polymer flocculant to the belt conveyor;
While the fermentation accelerator supply device agitates the powdered fermentation accelerator with the stirring member, the fermentation accelerator is discharged from the outlet by the spiral extrusion member, and the fermentation accelerator is in a ratio of 50 kg to 100 kg with respect to 1 cubic meter of the dehydrated cake. Then, supplying the fermentation accelerator continuously from a predetermined supply port to a space that passes through until the dewatered cake discharged from the end in the traveling direction of the belt conveyor is deposited on the hopper,
A step of adding the fermentation accelerator so as to be applied to the surface of the dehydrated cake discharged in order from the end in the traveling direction of the belt conveyor passing through the space within 1 minute after being discharged from the dehydrator. When,
The dehydrated cake coated with the fermentation accelerator falls onto the hopper and accumulates, and forms a dehydrated cake mixed with the fermentation accelerator;
A method for producing a deposited dehydrated cake mixed with a fermentation accelerator having

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