JP2003063887A - Internal mixing type fermentation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal mixing type fermentation apparatus by which good compost is obtained without adjusting the apparatus in response to the change in the nature of a treated substance. SOLUTION: The treated substance X within a tank 5a is sequentially scraped up with a plurality of scrapers 10a, 10b arranged on the inner surface 5b of the peripheral wall of the tank 5a in accordance with the rotation of the tank 5a. In this case, the treated substances whose particle size become greater by being rolled and granulated according to the rotation of the tank 5a are also sequentially scraped up by the above scrapers 10a, 10b. The treated substances scraped up by the scrapers 10a, 10b are caused to slide down sequentially from scrapers 10a, 10b at a position higher than the repose angle θ5 of the above treated substances, and the treated substances slid down from the scrapers 10a, 10b collide with inclined baffle plates 11b (11a) and are crushed and further fall down and are mixed with the treated substances X forming an inclined face due to the rotation of the tank 5. In this way, the mixture becomes not to ball form but to granules of desired particle size so as to ensure air permeability and sufficiently fermented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an internal mixing type fermentation apparatus for fermenting sludge to obtain compost.

[0002]

2. Description of the Related Art There is known a composting process in which surplus sludge generated by treating sewage or the like with activated sludge is composted and reused as a resource.

In this composting treatment, a sludge dewatering machine is used to mix sludge with a coagulant and dewater it to obtain dewatered sludge having a water content of about 80%, and this dewatered sludge is mixed with a predetermined amount of product compost in a mixer. Since then, an external mixing method is known in which a mixture of this dehydrated sludge and product compost is put into a fermenter and fermented. Here, the reason why a predetermined amount of product compost is mixed with the dehydrated sludge is that the product compost is used as seed compost and the water content of the mixture is set to a water content suitable for composting. However, in this external mixing method, a transport conveyor and a mixer that connect the mixer and the fermentation tank are separately required, and the equipment cost increases, so mixing of dehydrated sludge and product compost and fermentation of the mixture are performed in the same tank. So-called internal mixing type fermenters have been studied and put into practical use.

An example of a conventional internal mixing type fermentation apparatus is shown in FIG.
Shown in. The internal mixing type fermentation apparatus 80 shown in FIG. 10 is configured by applying the apparatus described in JP-A-8-73290, and the like, and the inner circumference of a horizontally rotatable drum-shaped tank (fermentation tank) 81. While the spiral blade (also called a ribbon screw) 82 is provided on the surface, the tank 8 is placed on the axis of the tank 81.
1, a rotatable rotary shaft 83 is provided separately, and a spiral blade 84 having a spiral direction opposite to that of the spiral blade 82 is provided on the outer circumference of the rotary shaft 83. Sludge is supplied from the input pipe 85 to a predetermined amount of product compost remaining on the extraction pipe 86 side for taking out the compost, and the tank 81 and the rotary shaft 83 are rotated in the same direction, whereby the spiral blades 82, 84 are used. The product compost is obtained by fermenting the mixture while repeatedly transporting the sludge and the residual product compost in the axial direction of the tank 81 while repeating the transfer.

[0005]

If the sludge and the residual product compost are not sufficiently mixed, a good product compost cannot be obtained. Therefore, in the fermenter 80, it is necessary to increase the rotation speed of the tank 81 in order to improve the mixing property of the sludge and the residual product compost. However, if the rotation speed of the tank 81 is increased in this way, the tank 8
The object to be processed (sludge, residual product compost) lifted in the rotation direction of 1 is lifted above the repose angle of the object to be processed and slides on the inclined surface of the object to be processed formed by the rotation of the tank 81. (Rolling) falls. In this way, when the object to be processed slides down the inclined surface, rolling granulation occurs, and the phenomenon in which the mass of the object to be processed due to the rolling granulation slides down the inclined surface as the tank 81 rotates is gradually increased into a large mass. It will be dumpling-shaped compost. Such dumpling-like compost has poor air permeability and insufficient fermentation, resulting in defective compost.

Therefore, in order to prevent such rolling granulation of the object to be treated, an internal mixing type fermentation apparatus shown in FIG. 11 has been proposed. This fermentation apparatus 90 is provided with a fixed shaft 92 coaxially with the tank 91 in a rotatable drum-shaped tank 91, and a large number of inclined baffle plates 93 along the axial direction on the fixed shaft 92. When the object to be processed is sandwiched between these baffle plates 93, 93 and the object to be processed is lifted above the angle of repose by the rotation of the tank 91, the object to be processed is lifted by the rotation of the tank 91. The object to be processed is lifted up to almost the top position of the tank 91 while suppressing the sliding down of the object, and the object to be processed is gravity dropped from the top position and crushed by hitting the baffle plate 93 to form a coarse (dango-shaped) compost. It is to stop.

However, in the fermentor 90, since the lifting height changes especially when the property of sludge changes, the inclination angle of the baffle plate 93 and the baffle plates 93, 93.
Since it is necessary to adjust the interval between each case, the work is troublesome and not practical.

The present invention has been made to solve the above problems, and provides an internal mixing type fermenter capable of obtaining good compost without adjusting the device according to the properties of the object to be treated. The purpose is to provide.

[0009]

The internal mixing type fermenter according to the present invention is provided with a drum-shaped tank, and the product compost remaining in the tank and the sludge introduced into the tank from the inlet are stored in the tank. In an internal mixing type fermenter that mixes by rotation and further ferments in the tank to obtain product compost, it is arranged on the inner surface of the peripheral wall of the tank and scrapes the object to be processed in the tank according to the rotation of the tank and rests the object to be processed. A plurality of scrapers that slide down at a position higher than a corner and an inclined baffle plate that is disposed at a position where the object to be processed fall from the scrapers are provided.

According to such an internal mixing type fermentation apparatus,
The object to be treated in the tank is sequentially scraped by a plurality of scrapers arranged on the inner surface of the peripheral wall of the tank as the tank rotates,
At this time, the object to be treated whose particle size has been increased by rolling granulation according to the rotation of the tank is sequentially scraped up by the scraper,
The processing object scraped up by the scraper is successively slid off from the scraper at a position higher than the repose angle of the processing object. The object slid from the scraper collides with the slanting baffle plate, is crushed, and further falls,
It is mixed with the object to be processed forming the inclined surface by the rotation of the tank. For this reason, the mixture is not in the form of dumplings but has a desired particle size, air permeability is ensured, and fermentation is sufficiently performed.

Here, a plurality of baffle plates are arranged in the axial direction of the tank, and the baffle plates are slanted so that the object to be treated slid down from the scraper and colliding toward one end of the tank. If the first baffle plate and the second baffle plate inclined so as to be directed toward the other end of the tank are mixed, the object to be crushed by colliding with the baffle plate is, Corresponding to the baffle plate that collided, it drops toward one of the end sides and goes toward both end sides by both the first and second baffle plates. To be enhanced.

Further, a plurality of scrapers are arranged on the inner surface of the peripheral wall of the tank, and when scraping up the object to be processed in the tank, a part of the object is treated at one end of the tank. A first scraper provided with a bottom plate inclined so as to slide down to the other side, and a second scraper provided with a bottom plate inclined so as to slide down toward the other end side in the tank, and a configuration comprising a mixture. The object to be scraped up by the scraper is
When being scraped up, a part of it slides down toward one of the end sides corresponding to the scraper to be scraped up, and the first and second scrapers move toward both end sides, The mixing property of the object to be processed in the axial direction is sufficiently enhanced.

Further, if the first and second scrapers are arranged in the circumferential direction of the inner surface of the circumferential wall of the tank, the mixing property of the object to be treated in the axial direction can be more sufficiently enhanced.

If a plurality of sets of the first and second scrapers arranged in the circumferential direction on the inner surface of the peripheral wall of the tank are arranged in the axial direction of the tank, the objects to be treated are mixed in the axial direction. The sex is further enhanced sufficiently.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an internal mixing type fermentation apparatus according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram showing a compost manufacturing system adopting an internal mixing type fermentation apparatus according to the present invention,
2 is a partial cross-sectional configuration diagram showing the internal mixing type fermentation apparatus in FIG. 1, FIG. 3 is a view taken along the line AA of FIG. 2, and FIG. 4 is located at a position Y in FIG. The perspective view which looked at the 2nd scraper from the B direction in the tank, FIG. 5 is the CC arrow line view of FIG. 4, FIG.
5 is a configuration view showing the baffle plate and the baffle plate support shaft in FIG. 2 extracted from FIG. 5, and FIG.
FIG.

This compost manufacturing system is attached to a water treatment system, and as shown in FIG. 1, mainly comprises an internal mixing type fermenter 5 for producing compost, and a sludge storage tank 1 in front of this. , A flocculant storage tank 2, a sludge flocculation tank 3, and a sludge dewatering machine 4.

The sludge storage tank 1 stores surplus activated sludge (surplus activated sludge in a water treatment system) for agricultural settlement drainage, industrial drainage, small-scale sewage treatment, etc. This sludge storage tank 1
Is connected to a sludge aggregating tank 3 via a line L1 for supplying surplus activated sludge.

The coagulant storage tank 2 stores a solution of an inorganic coagulant such as polyiron sulfate. The sludge flocculation tank 3 is connected to the flocculant storage tank 2 through a line L2 for supplying a flocculant solution.

The sludge flocculation tank 3 mixes the excess activated sludge from the line L1 and the flocculant solution from the line L2 to flocculate the sludge to obtain flocculated sludge. A sludge dewatering machine 4 is connected to the sludge aggregating tank 3 via a line L3 for supplying the agglomerated sludge.

The sludge dehydrator 4 is, for example, a belt press type,
A sludge dewatering machine such as a screw press type or a centrifugal dewatering type, which dewaters the coagulated sludge from the line L3 to a water content of about 80 to 90% to obtain dewatered sludge (plate-shaped dewatered cake). An internal mixing type fermentation apparatus 5 is connected to the sludge dehydrator 4 via a line L4 for supplying dehydrated sludge.

The internal mixing type fermenter 5 ferments the dehydrated sludge from the line L4 to obtain a product compost (compost). The dehydrated sludge is introduced once / week to obtain the product compost once / week. It is said to be a batch operation with a one-week cycle.

This fermenter 5 is provided with a cylindrical tank 5a arranged so that its axis is horizontal, and the inside of this tank 5a mixes the dehydrated sludge to be introduced with the remaining product compost described below. It is a space for fermenting this mixture.

As shown in FIG. 2, both ends of the tank 5a are closed by support plates 12a and 12b serving as fixing portions and are rotatably supported and fixed to the outer surface of the peripheral wall of the tank 5a. Rotation is performed by transmitting a rotational drive force from a drive source (not shown) to the gear 14 formed. An input pipe 21 that is connected to the line L4 and that inputs the dehydrated sludge into the tank 5a is introduced through the one support plate 12a above the end surface of the tank 5a on one side.

As shown in FIG. 1, the fermenter 5 is additionally provided with a blower 6 and a line 5 for introducing air from the blower 6 to the tank 5a is set. And tank 5a
An air supply pipe 24, which is connected to the line 5 and supplies air from the blower 6 into the tank 5a, is introduced through the one support plate 12a, as shown in FIG. .
Further, the line L5 is provided with an air heater 7 for heating the air from the blower 6 in the middle thereof, as shown in FIG. The blower 6 is independently driven in the fermentation process to supply air to the tank 5.
On the other hand, the blower 6 and the air heater 7 are driven together in the drying process after the fermentation process to supply hot air into the tank 5a.

From the upper end surface on the other side of the tank 5a,
An exhaust gas pipe 23 for discharging the exhaust gas in the tank 5a generated in the fermentation process and the drying process to the exhaust treatment facility 9 is led out through the other support plate 12b as shown in FIG. The exhaust treatment facility 9 performs a predetermined treatment on the exhaust gas from the tank 5a and discharges it as harmless and odorless gas to the outside.

Further, from the lower end surface on the other side of the tank 5a, a take-out pipe 22 for taking out the product compost produced in the tank 5a to the outside is led out through the other support plate 12b. . The product compost thus taken out is packed in bags and shipped.

In particular, in this embodiment, as shown in FIGS. 2 and 3, a large number of scrapers 10a, 10b are provided on the inner surface 5b of the peripheral wall of the tank 5a, and a large number of scrapers are arranged in the tank 5a along the axis of the tank 5a. Baffle plates 11a and 11b.

As shown in FIGS. 3 and 4, the scrapers 10a and 10b form a box shape together with the inner surface 5b of the peripheral wall of the tank 5a, and the objects to be treated (sludge, residual product compost in the tank 5a are rotated as the tank 5a rotates. ) And slide down the scraped object to be processed from its predetermined position by its own weight, and when scraping the object to be processed, part of the object to be processed is slid down in its own direction and dispersed. It is what makes me.

Hereinafter, the scrapers 10a, 1 as a single body
Although the structure of 0b will be described, in consideration of the easy understanding of the description, the scrapers 10a and 10b that are generally located at the horizontal level HL including the axis of the tank 5a are located on the right side when viewed from the charging pipe 21 side. The scrapers 10a and 10b that are operating (positioned at the position Y shown in FIG. 3) will be described. In addition,
At this position Y, the scraper 1 is moved according to the rotation of the tank 5a.
0a and the scraper 10b are sequentially located.

As shown in FIGS. 4 to 6, the scraper 10
a, 10b (scraper 10b is shown in FIGS. 4 to 6)
Is a bottom plate 14 that is connected to the inner surface 5b of the peripheral wall and has a predetermined downward inclination (inclination at a predetermined inclination angle θ1 with respect to the horizontal level HL) toward one of the ends of the tank 5a. A first side plate 15 connected to the bottom plate 14 at a predetermined opening angle θ2 at an end of the inner wall 5b of the bottom plate 14 opposite to the connecting end, and the first side plate 15 and the inner wall of the peripheral wall. 5b and also has a predetermined opening angle θ3 with respect to the bottom plate 14 and is connected to the upper end portion (the right end portion in the drawings of FIGS. 4 and 6) of the bottom plate 14 to open one side of the box shape. And a second side plate 16 closing the end. Note that FIG.
The hatched line indicates the inner surface 5b of the peripheral wall to which the bottom plate 14 and the second side plate 16 are connected. Here, the inclination angle θ1 is set to a predetermined angle equal to or less than the repose angle of the object to be processed, and the opening angle θ2
Although θ3 is set to a predetermined obtuse angle, these angles θ1
A preferred angle of ~? 3 will be described later.

As shown in FIG. 2, the bottom plate 14 is a first scraper 10a that is inclined downward as it goes toward one end of the tank 5a (on the side of the charging pipe 21). The second scraper 10b is inclined downward toward the other end (outlet pipe 22 side) in the tank 5a.
And these first and second scrapers 10a, 10b
Are arranged in parallel on the same circumference, and a large number of first and second scrapers 1 are arranged on the same circumference.
A large number of sets of 0a and 10b are arranged in parallel in the axial direction of the tank 5a. The scrapers 10a and 10b shown by hidden lines (dotted lines) in FIG. 2 represent fixed portions of the scrapers 10a and 10b with respect to the inner surface 5b of the peripheral wall.

Further, as shown in FIGS. 2 and 3, the tank 5a
The baffle plate support shafts 13, 13 are fixedly supported by the support plates 12a, 12b and installed horizontally above the axis of the tank 5a inside the baffle plate support shafts 13,
As shown in FIGS. 2 and 7, the multiple baffle plates 11 are
a and 11b are juxtaposed along the axis.

As shown in FIGS. 7 and 8, the baffle plates 11a and 11b are rectangular plates which are inclined in a predetermined direction so that the objects to be slid off from the scrapers 10a and 10b at predetermined positions collide with each other. In addition to crushing the object to be processed, the colliding object is dropped in a predetermined direction to be dispersed.

These baffle plates 11a and 11b are, as shown in FIGS. 2 and 7, taken out from the center of the tank 5a.
Side (the other support plate 12b side; the other end side) of the first baffle plate 11a and the second baffle on the side of the charging pipe 21 (one support plate 12a side; one end side) from the center of the tank 5a. Board 1
1b, the first baffle plate 11a is installed at a predetermined inclination angle θ4 with respect to the axis so that its upper surface faces one end side in the tank 5a. 11b is installed so as to be inclined at a predetermined inclination angle θ4 with respect to the axis so that its upper surface faces the other end side in the tank 5a. As shown in FIG. 3, these inclined baffle plates 11a and 11b are installed so as to be located immediately below the top position of the tank 5a and the vicinity thereof. The suitable angle of the angle θ4 will be described later.

Next, the operation of the compost manufacturing system having such a configuration will be described. Here, for the sake of convenience of explanation, product composting (water content of 20 to
(About 35%) will be described. First, the product compost is taken out from the extraction pipe 22 so that a predetermined amount of the product compost remains. A certain amount (about 35% in filling rate) of product compost remains on the extraction pipe 22 side,
This remaining product compost is used as seed compost in the next production, and the water content of the mixture with the dehydrated sludge added in the next production is about 40 to 60% (water content suitable for composting). Adjust so that

On the other hand, the surplus activated sludge in the sludge storage tank 1 and the coagulant solution in the coagulant storage tank 2 are guided to and mixed with the sludge coagulation tank 3, and the coagulated sludge aggregated here is guided to the sludge dehydrator 4. The condensed sludge is dehydrated to a water content of about 80 to 90% by driving the sludge dewatering machine 4, and the dewatered sludge is put into the tank 5a through the feeding pipe 21 while the sludge dewatering machine 4 is supplied. The dehydrated filtrate dehydrated in (1) is processed as desired.

When the dehydrated sludge is added, the tank 5a rotates at a predetermined rotation speed that allows the dehydrated sludge and the residual product compost to be mixed well. Then, these objects to be processed are in the tank 5a.
Is lifted in the rotation direction in accordance with the rotation of No. 1 and is lifted beyond the repose angle θ5 (see FIG. 3) of the object X to be mixed while causing rolling granulation.

On the other hand, at the same time, the scrapers 10a and 10b sequentially scrape up the object to be treated as the tank 5a rotates. At this time, the object to be treated whose grain size has been increased by rolling granulation is also scraped up in sequence. When the scrapers 10a and 10b scrape up the object to be processed, at this time, the bottom plate 14 has an inclination angle θ1 (below the repose angle of the object to be processed).
Since the object is scraped up, a part of the scraped object to be processed slides down.

Here, the object to be treated is the first scraper 10a.
When scraped up by, the first scraper 10a
Bottom plate 14 is located at one end of tank 5a (on the side of charging pipe 21)
Since it is inclined downward as it goes toward, when a part of the object to be processed slides down toward one end side and the object to be processed is scraped up by the second scraper 10b, Since the bottom plate 14 of the scraper 10b is inclined downward toward the other end side (take-out pipe 22 side) in the tank 5a, a part of the object to be processed slides down toward the other end side. . Since the first scraper 10a and the second scraper 10b are alternately arranged in the circumferential direction of the inner surface of the circumferential wall of the tank 5a, the slidable object to be processed is directed to both end sides in the axial direction almost uniformly, and The processed materials are thoroughly mixed in the axial direction, and the scrapers 10a and 10b are further mixed.
Since a plurality of sets in the circumferential direction are arranged in the axial direction of the tank 5a, the object to be treated is more sufficiently mixed in the axial direction. In this way, in order to slide a part of the object to be processed from the scrapers 10a and 10b, the inclination angle θ1 of the bottom plate 14 is
It is preferably 5 to 30 °.

When the scrapers 10a and 10b scraping up the object to be processed reach the top position of the tank 5a and its vicinity (a position higher than the repose angle θ5 of the object to be processed) as the tank 5a rotates, Since the one side plate 15 is opened at an opening angle θ2 with respect to the bottom plate 14, the scrapers 10a, 10b
The object to be treated scraped up to the surface slides down by its own weight (see the second scraper 10b at the top position of the tank 5a shown in FIG. 3). At this time, the object to be treated whose grain size is increased by rolling granulation also slides down. In this way, it is preferable that the opening angle θ2 is 110 to 135 ° so that the object to be processed slides down by its own weight at the top position of the tank 5a and the position in the vicinity thereof. The open angle θ3 is preferably about 120 °.

Here, the baffle plate 11 is provided at the dropping position of the object to be processed just below the top position of the tank 5a and its vicinity.
Since a and 11b are provided, the falling object to be processed collides with the baffle plates 11a and 11b, and the coarse object to be processed is crushed.

At this time, the second baffle plate 1 on one end side
The object to be processed that collides with 1b is the second baffle plate 11b.
Since the upper surface of the other end is inclined so as to face the other end side, the object to be processed which is directed toward the other end side and collides with the first baffle plate 11a on the other end side is the first baffle. Since the upper surface of the plate 11a is inclined so as to face the one end side, the plate 11a faces the one end side. That is, since the object to be processed on one end side is directed to the other end side and the object to be processed on the other end side is directed to one end side, the object to be processed is more sufficiently axially. Mixed. In this way, the inclination angle θ4 is preferably 45 to 60 ° so that the baffle plates 11a and 11b guide the object to be processed to the end side in the tank 5a.

As described above, the object to be processed is sufficiently mixed by the action of the scrapers 10a and 10b and the baffle plates 11a and 11b, and the object to be processed coarsened by the rolling granulation is the scraper 10a, Sliding from 10b sequentially, colliding with the baffle plates 11a and 11b and sequentially crushing, this is repeated, and the object to be treated is sufficiently mixed while preventing coarsening of the particle size.

In the fermentation process by this mixing, the blower 6 is driven independently to supply the air required for fermentation into the tank 5a to satisfactorily ferment the mixture, and when the fermentation process for a predetermined period is completed, the drying process is performed. Blower 6 and air heater 7
Are driven together to supply warm air into the tank 5a to dry the fermented product. Exhaust gas generated in the drying process and the fermentation process is treated in the exhaust treatment facility 9. Then, a drying process is performed to obtain a product compost having a predetermined water content (about 20 to 35%).

As described above, in the present embodiment, since the coarsening of the mixture is prevented and the desired particle size is obtained,
Ventilation is secured and fermentation is fully achieved. Therefore, good compost can be obtained without adjusting the apparatus for changes in the properties of the object to be treated.

By the way, in the fermenter 80 shown in FIG. 10, sludge having a water content of 80 to 90% supplied from the input pipe 85 is fed to the one end of the tank 81 by the spiral blades 84 of the rotary shaft 83. Even when trying to send the product compost from the (input pipe 85 side) to the other end side (the extraction pipe 86 side) where the product compost remains, the sludge adheres to the spiral blade 84, so the sludge and the residual product compost are sufficiently mixed. It is impossible. Therefore, in order to prevent the sludge from adhering to the spiral blades 84, it is possible to throw a large amount of a moisture regulator such as rice husks,
There is a problem that it is difficult to obtain a large amount of rice husks and the like, and the running cost becomes high, and that the tank 81 needs to be upsized and the equipment cost becomes high. Further, also in the conventional fermentation apparatus 90 shown in FIG. 11, since the baffle plate 93 is inclined so as to face only one end side in the tank 91, the sludge supplied from the input pipe 85 is It is impossible to sufficiently mix the product compost remaining on the extraction pipe 86 side.

However, in the fermentation apparatus 5 of this embodiment, as described above, the scrapers 10a, 10b and the baffle plates 11a,
By 11b, sludge and residual product compost can be sufficiently mixed in the axial direction, and good product compost can be obtained.

Hereinafter, Example 1 and Comparative Example 1 carried out by the inventor of the present invention in order to confirm the effect of the scraper of the above embodiment.
I will describe.

(Example 1) A tank having a diameter DM = 600 mm, a length LG = 1500 mm (see FIG. 1) and equipped with the scrapers 10a and 10b on the inner surface of the peripheral wall was used.
170 mm of white polypropylene beads was filled into the side of the 170 L take-out tube, and 20 L of red polypropylene beads of the same diameter was put in from a charging pipe. The rotation speed of the tank was 30 rotations / hour, and the rotation was performed for 5 hours. Then, after rotating for 5 hours, polypropylene beads were collected to examine the mixed state of white and red.

Comparative Example 1 The same as Example 1 except that the fermentation apparatus 80 shown in FIG. 10 was used.

The results of Example 1 and Comparative Example 1 are shown in FIG.
In FIG. 9, the horizontal axis represents the axial position in the tank, the vertical axis represents the ratio of red polypropylene beads to all polypropylene beads, the black circles correspond to Example 1, and the white circles correspond to Comparative Example 1. ing.

As shown in FIG. 9, in Comparative Example 1, the mixing was not sufficiently performed in the axial direction in the tank, but in Example 1, the mixing was sufficiently performed in the axial direction in the tank. As a result, the effect that the scrapers 10a and 10b improve the mixing property was confirmed.

Further, Example 2 and Comparative Example 2 carried out by the present inventor in order to confirm the effects of the scraper and the baffle plate of the above-mentioned embodiment will be described below.

Example 2 Using the fermentation apparatus 5 shown in FIGS. 1 and 2, the tank 5a has a diameter DM = 1800 mm and a length L.
G = 4000 mm, and the dimensions of the scrapers 10a and 10b (see FIGS. 4 to 6 for the dimension parts) are determined by the bottom plate 14
Length of the tank in the axial direction L11 = 200 mm, width L of the bottom plate 14
12 = 200 mm, vertical height L13 from the connecting portion of the second side plate 16 with the bottom plate 14 = 100 mm, inclination angle θ1
= 10 °, open angle θ2 = 120 °, 135 ° (120 ° is a scraper from the center to the take-out pipe 22 side, 135 ° is a scraper from the center to the input pipe 21 side), and an open angle θ3 = 120 °. , 10b are alternately arranged every 22.5 ° in the circumferential direction of the inner surface 5b of the circumferential wall (16 in total in the circumferential direction), and the scrapers 10 in the circumferential direction are arranged.
Seven sets of a and 10b were installed in the axial direction (112 in total in the circumferential direction and the axial direction). In addition, the baffle plate 11a,
Dimension of 11b (see FIGS. 7 and 8 for dimension part)
Is the vertical height L14 of the baffle plates 11a and 11b =
520 mm, axial length L15 of baffle plates 11a and 11b = 300 mm, distance L16 between baffle plates = 6
00 mm, width L17 of the baffle plates 11a and 11b = 60
The tilt angle was 0 mm and the inclination angle θ4 was 60 °. And tank 5a
The product compost with a water content of about 30% remains inside, and the water content is about 80%, the thickness is 2 to 4 mm, and the area is 1 to 1.
A 0 cm ² plate-shaped dehydrated sludge (using an inorganic salt as a dehydration aid) is charged from the charging pipe 21 so that the average water content of the mixture is about 45%, and 40 kg of a fermentation aid such as oil cake to promote fermentation. Was charged from the charging pipe 21. For about 6 days from the addition of dehydrated sludge to the end of fermentation, continuous rotation was performed at a low speed of 6 revolutions / hour. Regarding the air required for fermentation, the blower amount and the exhaust amount were adjusted by the blower 6 and the exhaust treatment facility 9 while monitoring the fermentation state. After the fermentation was completed, it was dried with warm air of 80 ° C by the air heater 7 so that the water content became about 30 to 35%. The dried compost was taken out from the take-out tube 22, and the particle size and the fermentation state were examined.

Comparative Example 2 The same as Example 2 except that the fermentation apparatus 80 shown in FIG. 10 was used.

As a result, in Comparative Example 2, dumpling-shaped composts of several cm or more were produced in a large amount of 50% or more and unfermented portions were large, but in Example 2, coarse compost of 8 mm or more was not recognized. Also, no unfermented part was observed. As a result, it was confirmed that the scrapers 10a and 10b and the baffle plates 11a and 11b have the effect of eliminating coarse dumpling-shaped coarse compost and achieving sufficient fermentation.

Although the present invention has been specifically described based on its embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the tank 5a is used.
The first baffle plate 11a and the second baffle plate 11b are used as the baffle plates on the side of the take-out pipe 22 and the side of the feed pipe 21 with the center of the boundary as the boundary.
The first and second baffle plates 11a and 11 are divided into
b may be arranged alternately along the axial direction.

As the scrapers 10a and 10b, the structure of the above embodiment is adopted as being particularly preferable, but the scrapers are not limited to this structure.

[0059]

INDUSTRIAL APPLICABILITY The internal mixing type fermenter according to the present invention sequentially scrapes up the object to be treated in the tank by a plurality of scrapers arranged on the inner surface of the peripheral wall of the tank according to the rotation of the tank.
The object to be treated, which has been increased in size by rolling granulation according to the rotation of the tank, is also sequentially scraped by the scraper, and the object scraped by the scraper is removed from the scraper at a position higher than the repose angle of the workpiece. Sliding down one by one, the object to be slid off from this scraper is crushed by colliding with an inclined baffle plate, and further dropped, so that the object to be processed which forms an inclined surface by rotation of the tank is mixed, Since the mixture is not in the form of dumplings but has a desired particle size to ensure air permeability and sufficient fermentation, good composting is possible without adjusting the device for changes in the properties of the object to be treated. Can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a compost manufacturing system adopting an internal mixing type fermentation apparatus according to the present invention.

FIG. 2 is a partial cross-sectional configuration diagram showing the internal mixing type fermentation apparatus in FIG.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a perspective view of the second scraper located at the position Y in FIG. 3 as seen from the direction B in the tank.

5 is a view taken along the line CC of FIG.

FIG. 6 is a view on arrow D-D of FIG. 5.

FIG. 7 is a configuration diagram showing the baffle plate and the baffle plate support shaft in FIG. 2 in an extracted manner.

FIG. 8 is a view taken along the line EE of FIG.

FIG. 9 is a diagram showing a state of mixing in the axial direction of the object to be treated in the tank in comparison between Example 1 and Comparative Example 1.

FIG. 10 is a configuration diagram showing an internal mixing type fermentation apparatus according to a conventional technique.

FIG. 11 is a configuration diagram showing another internal mixing type fermentation apparatus according to the prior art.

[Explanation of symbols]

5 ... internal mixing type fermenter, 5a ... tank, 5b ... inner wall inner surface,
10a ... first scraper, 10b ... second scraper, 1
1a ... 1st baffle board, 11b ... 2nd baffle board, 14
... bottom plate of scraper, 21 ... input pipe (inlet; one end side), 22 ... take-out pipe (other end side), θ5 ... repose angle of object to be treated, X ... object to be treated.

Claims (5)

[Claims] 1. A drum-shaped tank is provided, and product compost remaining in this tank and sludge introduced into the tank through an inlet are mixed by rotation of the tank and fermented in the tank to produce product compost. In the internal mixing type fermenter to obtain, a plurality of scrapers disposed on the inner surface of the peripheral wall of the tank, scraping up the object to be treated in the tank according to the rotation of the tank and sliding it down at a position higher than the repose angle of the object to be treated An internal mixing-type fermentation apparatus comprising: an inclined baffle plate arranged at a position where the object to be treated is dropped from the scraper. 2. A plurality of the baffle plates are arranged in the axial direction of the tank, and the baffle plates are arranged so that an object to be processed that has slid from the scraper and collides toward one end of the tank. 2. The internal mixing type fermenter according to claim 1, wherein a first baffle plate inclined toward the other end and a second baffle plate inclined toward the other end side in the tank are mixed. . 3. A plurality of the scrapers are provided on an inner surface of a peripheral wall of the tank, and when these scrapers scrape up the object to be processed in the tank, a part of the object to be processed is in the tank. A first scraper having a bottom plate inclined to slide to one end side and a second scraper having a bottom plate inclined to slide to the other end side in the tank are mixed. The internal mixing type fermentation apparatus according to claim 1 or 2, characterized in that. 4. The internal mixing type fermenter according to claim 3, wherein the first and second scrapers are arranged in the circumferential direction of the inner surface of the circumferential wall of the tank. 5. A plurality of sets of the first and second scrapers arranged in the circumferential direction of the inner surface of the peripheral wall of the tank are arranged in the axial direction of the tank. The internal mixing type fermentation apparatus described.