KR20070090057A - Waste processing apparatus - Google Patents

Abstract

A waste processing apparatus which enables heavy foreign materials to be certainly discharged from a methane fermentation tank while reducing the consumption of power required for operating the methane fermentation tank is provided. As a waste processing apparatus having a methane fermentation tank(4) for performing methane fermentation of waste introduced into the methane fermentation tank, the waste processing apparatus is characterized in that the methane fermentation tank comprises: a rake unit(4x) having a rake part that rakes heavy foreign materials contained in the waste settled on the bottom within the methane fermentation tank toward one direction; and a discharge port(4j) discharging the heavy foreign materials raked toward the one direction by the rake unit. The rake part of the rake unit is a screw(4y) extending in the one direction.

Description

Waste processing apparatus

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the waste processing apparatus provided with the waste processing apparatus which concerns on one Embodiment of this invention.

FIG. 2 is a diagram illustrating a methane fermentation tank in FIG. 1.

FIG. 3 is a front sectional configuration diagram showing a screw press as the solid-liquid separator in FIG. 1.

FIG. 4 is a view showing another configuration of the front end than the methane fermentation tank in FIG. 1.

5 is a block diagram showing a methane fermentation tank constituting a waste treatment apparatus according to another embodiment of the present invention.

6 is a block diagram showing a bottom portion of a methane fermentation tank constituting a waste treatment apparatus according to still another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

 4, 14, 24, 34, 44, 54: methane fermentation tank

4b: lower part of the bath

4c, 44c: home

4j: outlet

4x: Rake device

4y: screw (lake part)

5: screw press (solid-liquid separation device)

100: waste disposal apparatus

a: Food waste (waste)

The present invention relates to a waste treatment apparatus provided with a methane fermentation tank.

The types of methane fermenters for methane fermentation of wastes are largely divided into vertical and horizontal types. The vertical here means, for example, that the axis of the cylindrical jaw extends in the vertical direction, and the horizontal means, for example, the axis of the cylindrical jaw extends in the horizontal direction. Moreover, methane fermentation tanks are dry (about TS20-40%) and wet (TS15% or less) depending on the sludge concentration in the tank, depending on the methane fermentation temperature, high temperature (about 55 ° C) and medium temperature (about 37 ° C). According to the operation method, it is divided into continuous type and batch type (batch type), respectively. In methane fermentation of waste, organic waste such as sludge such as sewage, livestock manure, food waste, paper or vegetation, etc. are used as raw materials, and a method suitable for each property is adopted.

In view of the methane fermentation tank, almost all organic wastes can be vertically handled, but in the horizontal methane fermentation tank, it is difficult to treat food waste alone. Examples of the methane fermentation of food waste alone include the following. ⑴ Food wastes contain heavy foreign substances such as shells, egg shells, earth and sand or metals. (B) Since food waste has a high nitrogen concentration and a high decomposition rate of organic matter, the ammonia concentration in the methane fermentation tank is high, and the ammonia is susceptible to ammonia inhibition. Therefore, in order to avoid ammonia inhibition, the sludge concentration in a methane fermentation tank cannot be maintained high, and it is necessary to lower sludge concentration. However, when the sludge concentration is lowered, it is difficult to operate dry, and wet operation is suitable. 하면 When the sludge concentration in the methane fermentation tank is kept low, heavy foreign matters settle in the methane fermentation tank and are deposited at the bottom. In this connection, when the vertical type is adopted in the methane fermentation of food waste, the heavy foreign matter precipitates at the bottom but is discharged out of the tank together with the digested sludge. In addition, in sludge and livestock manure, organic matters are not decomposed as much as food waste, because heavy foreign matters such as soil and sand are difficult to settle. Moreover, in paper and vegetation, since nitrogen concentration is low, operation by dryness with high sludge concentration is possible, and since it does not settle even if heavy foreign material mixes, even if it is a horizontal type, there is no problem.

Thus, when waste is used as food waste especially when a horizontal type methane fermentation tank is adopted, the foreign body which accumulates in the horizontally long bottom part of a methane fermentation tank is attached to the end or side end of the bottom of a methane fermentation tank. It is necessary to discharge actively at the outlet of the part. Such a technique is disclosed in Patent Document 1 below. The technique described in this publication is provided with a discharge port at the side end of the horizontal methane fermentation tank, a pump is provided in the discharge pipe downstream of the discharge port, and the pump is driven to extract the fire sludge at the bottom of the tank. By removing the digested sludge, heavy foreign matter is also discharged.

[Patent Document 1] Japanese Patent Publication No. 2003-039099

However, in the technique described in the above publication, when the pipe diameter is increased so that heavy foreign matters do not accumulate in the discharge pipe, the speed at which fire sludge flows in the pipe decreases, and heavy foreign matters accumulate in the pipe. On the other hand, if the pipe diameter is reduced to increase the flow velocity in the pipe, a large weight foreign material will block the pipe, and anyway, a heavy weight foreign material will block, causing the heavy foreign material to be discharged from the methane fermentation tank. Cause problems. In addition, there is a problem that the pump power must be increased in order to at least prevent the accumulation of heavy foreign materials.

This invention is made | formed in order to solve such a subject, Comprising: It aims at providing the waste processing apparatus which can discharge heavy foreign material reliably from a methane fermentation tank, while saving power.

<Means for solving the problem>

A waste treatment apparatus according to the present invention is a waste treatment apparatus including a methane fermentation tank for methane fermenting introduced wastes, the methane fermentation tank having a weight in the waste settled at the bottom of the tank. A rake device having a rake portion for scraping foreign materials in one direction, and a discharge port for discharging heavy foreign materials scraped in one direction by the rake device. Doing.

According to such a waste treatment apparatus, foreign substances in the waste that settle in the bottom of the methane fermentation tank are deposited by the rake portion of the rake apparatus without using a pump that causes clogging and requires a large power. It is scraped away in one direction without being discharged from the outlet without causing the problem of blockage. For this reason, heavy foreign material is reliably discharged | emitted from a methane fermentation tank, trying to save power.

Here, the lower part of the jaw is composed of a downward slim shape that is thinner as it goes downward in one direction, and the downward slim shape extends in one direction. If the rake portion of the rake device is arranged in the portion so as to extend in one direction, the heavy foreign material is settled along the downward slim shape, and is easily guided to the rake portion of the rake device disposed in the bottom portion of the tank having the downward slim, The foreign matter is more reliably discharged from the methane fermenter.

In addition, if the bottom part of the tank has a groove shape along the outer shape of the lower part of the rake part of the rake device, the dead space between the tank and the rake part is reduced, so that heavy foreign matter is more reliably discharged from the methane fermentation tank without remaining in the tank. do.

Moreover, although various things are mentioned as a rake part of a rake device, it is preferable to employ | adopt a screw extended in one direction.

Here, the structure provided with the rake apparatus which scrapes the heavy foreign material of the bottom part in a tank toward one direction is suitable to apply to what is called a horizontal methane fermentation tank. In such a horizontal methane fermentation tank, a configuration including a solid-liquid separation device for solid-liquid separation of the discharge from the discharge port just below the discharge port of the methane fermentation tank can be adopted. This is because horizontal methane fermenters have a lower liquid level than vertical methane fermenters, so even if a solid-liquid separator is disposed directly below the outlet of the methane fermenter, the pressure acting in the solid-liquid separator is vertical. It is because it is lower than methane fermenter and does not cause a problem.

Moreover, although various things are mentioned as a solid-liquid separator, it is preferable to employ | adopt a screw press. According to this screw press, since it is a configuration which limits (blocks) the pressure acting from the methane fermentation tank, it functions as a stopper so that the discharge from the methane fermentation tank does not overflow and lowers the liquid level of the methane fermentation tank. Solid-liquid separation can be performed favorably. In this regard, the use of a belt press dehydrator, a centrifugal dehydrator, or the like does not have a stopper function to limit the pressure acting on the methane fermenter, resulting in a problem that the liquid from the methane fermenter overflows and the liquid level of the methane fermenter drops. Throw it away.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of the waste disposal apparatus which concerns on this invention is described, referring FIGS. Here, in each drawing, the same code | symbol is attached | subjected to the same or equivalent element, and the overlapping description is abbreviate | omitted. 1 to 4 show one embodiment of the present invention, FIG. 5 shows another embodiment of the present invention, and FIG. 6 shows yet another embodiment of the present invention, respectively. An embodiment will be described with reference to.

1 is a block diagram showing a waste treatment facility equipped with a waste treatment apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing a methane fermentation tank in FIG. 1, FIG. 3 is a solid-liquid separation device in FIG. 4 is a diagram showing another configuration of the front end of the methane fermenter in FIG. 1.

As shown in FIG. 1, the waste treatment apparatus 100 is installed in a cogeneration facility that is installed in the basement of a mansion and generates power from natural gas. The generated biogas is used as an auxiliary fuel for cogeneration. In addition to being used effectively, the resulting digestive sludge can be used as compost.

This waste treatment apparatus 100 includes a collection box 1, a storage tank 3, a methane fermentation tank (waste treatment apparatus) 4, a screw press (waste treatment apparatus) 5 as a solid-liquid separator, The sludge dryer 6, the dehumidifier 12, which are connected to the screw press 5 and provided with the drainage fitting 7 and the drainage treatment facility 8 in this order. The deodorizing device 13 is connected and provided in this order, and further, the desulfurization tower 9 connected to the methane fermentation tank 4, the gas holder 10, and the surplus gas combustion device 11 are provided in this order. It is connected and provided as it is. The collection port of the collection box 1, the desulfurization tower 9, the gas holder 10, and the surplus gas combustion device 11 are installed on the ground, and other than that are installed underground.

The collection box 1 receives the food waste (a) which is thrown in.

The storage tank 3 mixes the food waste a from the collection box 1 with surplus sludge generated in the wastewater treatment plant 8 at the rear stage, and adds steam b so that it is solubilized. It is. It is preferable to make solubilization temperature about 40-60 degreeC. In addition, steam (b) is preferably used in the cogeneration equipment, but in the equipment that does not generate steam, it may be obtained by operating a steam boiler separately. In addition, when treating food waste of low water content, water or treated water may be further added.

However, as shown in FIG. 4, the food waste grinder 2 is disposed at the lower portion of the collection box 1 to crush the food waste a put into the collection box 1 with the food waste grinder 2. Then, it may lead to the storage tank (3). In addition, when providing the food waste grinder 2 in this way, the storage tank 3 may be provided above the methane fermentation tank 4, and may be thrown in directly to the methane fermentation tank 4 in some cases.

Returning to FIG. 1 again, the input pump P at the rear end of the storage tank 3 is for injecting the food waste soluble in the storage tank 3 into the methane fermentation tank 4. Solubilization can be promoted by using this injection pump P as a crushing pump and circulating the contents of the storage tank 3 via the line L1.

The methane fermentation tank 4 is to methane ferment the solubilized food waste from the storage tank 3. The methane fermentation tank 4 is kept warm or warmed by hot water or steam c so that the fermentation temperature becomes a medium-temperature fermentation zone of about 37 ° C or a high temperature fermentation zone of about 55 ° C. When hot water is used, the methane fermentation tank 4 has a jacket structure to supply hot water generated from the cogeneration facility. In addition, when steam is used, it is added directly to the methane fermentation tank 4 and adjusted. However, the temperature of the methane fermentation tank 4 may be either a medium temperature fermentation zone or a high temperature fermentation zone. However, in the food waste (a) treatment alone, the ammonia concentration in the methane fermentation tank 4 increases, so that the operation management of stable fermentation and drainage treatment is maintained. In consideration, it is preferable to operate in a medium temperature fermentation zone. In addition, the residence time of the methane fermentation tank 4 shall be about 7-20 days.

In the methane fermentation tank 4, strong stirring is unnecessary, but in order to perform fermentation efficiently, it is preferable to provide a simple stirring mechanism. Here, since the horizontal type methane fermentation tank 4 is used (detailed later), the horizontal type stirrer (the stirring axis extends in the horizontal direction) 4r is used, but when the vertical type methane fermentation tank is used, It is preferable to set it as a suspension type (the stirring shaft extends in a perpendicular direction), and also it may be pump stirring or gas stirring, and what is important is just to be able to stir the inside of a methane fermentation tank to an appropriate grade. In the case of using a stirrer, however, when the stator blade provided on the stirring shaft is straight on, it is effective to destroy the scum generated in the methane fermenter if it comes out of the liquid level.

When organic matter is decomposed by methane fermentation, heavy foreign substances such as shells, egg shells, earth and sand or metals contained in food wastes are likely to settle in the methane fermentation tank. In the case of methane fermentation of food waste alone, the decomposition rate of organic matter is 70 to 90%, although it depends on the quality of food waste, for example, when methane fermentation is carried out at TS 10% and VS 9%, It becomes 1.9 to 3.7% and VS about 0.9 to 2.7%. The ease of sedimentation of the foreign matter is influenced by the viscosity of the sludge, but the viscosity of the sludge decreases with the decrease of the solid concentration, so that the foreign matter easily precipitates in the methane fermentation tank.

Here, in the present embodiment, as described above, the methane fermentation tank is installed underground of the mansion. For this reason, the horizontal methane fermentation tank 4 which can suppress a height compared with a vertical methane fermentation tank is used. The vertical here means, for example, that the axis of the cylindrical jaw extends in the vertical direction, and the horizontal means, for example, the axis of the cylindrical jaw extends in the horizontal direction. In such a horizontal methane fermentation tank, since a discharge port is provided at the side end of the horizontally long tank or at the bottom of the side end, the discharge sludge and the heavy foreign matter that settled widely at the horizontally long tank bottom are actively discharged. If not derived, it is deposited at the bottom. In addition, attempting to suck out the sludge and heavy foreign matter by means of a pump causes a problem of blockage as described above.

Therefore, especially in this embodiment, the horizontal methane fermentation tank 4 which does not generate | occur | produce a problem of blockage while there is no fear of depositing fire sludge and heavy foreign material is used. This horizontal methane fermentation tank 4 is shown in FIG.

2: is a block diagram which shows the methane fermentation tank, FIG. 2 (a) is a side cross-sectional block diagram which shows the methane fermentation tank in FIG. 1, and FIG. 2 (b) is a front cross-sectional block diagram which shows the methane fermentation tank.

The horizontal methane fermentation tank 4 has a horizontal stirrer 4r and a rake device in a non-circular ordinary body having both ends closed and placed in a horizontal direction. 4x). The upper part and the middle part 4a which are upper side than the lower part 4b of this methane fermentation tank 4 are comprised by the substantially semi-cylindrical shape (a circular arc shape which extends to the lower part rather than an axial center) which extends to a little lower part, and the lower part 4b is It is provided in a tangential direction at the bottom of the substantially semi-cylindrical shape of the upper part and the middle part 4a, and as shown in FIG.2 (a), it becomes the downward slim shape which becomes thinner as it goes down as seen from the axial direction of a normal body. In addition, this downward slim shape is configured to extend in the axial direction of the ordinary body, as shown in FIG. This lower function will be described later.

Moreover, the tank bottom part has the structure which the one end part (right end part of FIG.2 (b)) extends to one side more than the upper part, the middle part 4a, and the lower part 4b. This extended protrusion 4h is formed in a cylindrical shape. And the bottom part in the tank containing this extended protrusion part 4h has the structure which has the groove | channel 4c extended in the axial direction. That is, the bottom part in a tank becomes a groove shape.

Moreover, in the methane fermentation tank 4, from the storage tank 3 in the upper part of the edge part (left end part of FIG. 2 (b)) on the opposite side to the said extended protrusion part 4h in the upper part and the middle part 4a. An inlet 4i for introducing soluble food waste is provided, and an outlet 4j for discharging sludge and heavy foreign matter in the tank is provided at the bottom of the extended protrusion 4h. Biogas discharge port 4k for discharging the biogas generated in the tank on the upper end of the end (right end of FIG. 2 (b)) opposite to the inlet 4i in the upper part and the middle part 4a. Is provided.

The horizontal stirrer 4r is for efficiently performing methane fermentation, and has a stirring blade 4d on its circumferential surface and has a stirring shaft 4e extending along the axis of the ordinary body (horizontal direction). The outer motor 4f is configured to rotate. A seal such as a mechanical seal or a gland packing is used for the bearing 4g outside the stirring shaft 4e of the horizontal stirrer 4r, and the fire sludge leaks from the bearing 4g. It does not have a structure.

The rake device 4x is for scraping fire sludge and heavy foreign matter in the food waste settled in the bottom of the tank in one direction (toward the discharge port 4j), and the rake portion disposed along the groove 4c. The screw 4y is rotated by an electric motor 4m provided at the tank outer end of the extension protrusion 4h, and the screw 4y moves the fire sludge and the heavy foreign material toward one direction (outlet 4j). Driven by the electric motor 4m. In addition, the screw 4y is driven continuously or intermittently according to the ratio of the heavy foreign material introduced into the tank. As the bearing 4n of the screw 4y, a thread such as a mechanical thread, a gland packing, or the like is used, and the fire sludge does not leak from the bearing 4n. The screw diameter is preferably 200 mm or more. This is because, when the screw diameter is less than 200 mm, the frequency of clam shells and the like is increased.

And in order to reduce the dead space between a tank and the screw 4y, the groove | channel 4c of the bottom part in a tank becomes a shape along the external shape of the screw 4y lower side, as shown to FIG. 2 (a). .

In addition, although the rake device 4x is made into the apparatus which has the screw 4y as an especially preferable here, it is also possible to use a belt conveyor etc., for example.

Returning to FIG. 1 again, the screw press 5 is for solid-liquid separation of the discharge (sludge sludge and heavy foreign matter) from the methane fermentation tank 4, and the discharge port 4j of the methane fermentation tank 4. ) Just below it. This is because the horizontal methane fermentation tank 4 has a lower liquid level than the vertical methane fermentation tank, so that even if the screw press 5 is disposed directly below the outlet 4j of the methane fermentation tank 4, This is because the pressure acting in the screw press 5 is lower than that of the vertical methane fermentation tank and thus does not cause a problem. However, in consideration of maintenance, a gate valve may be provided between the methane fermentation tank 4 and the screw press 5.

As shown in FIG. 3, this screw press 5 is provided with the rotating screw 5a inside, and the predetermined diameter which connects internal and external to the casing 5b which accommodates this screw 5a, and makes it pass through. Has a large number of sorting holes (or slits) 5c, and the discharge from the methane fermentation tank 4 introduced from the inlet 5d is gravity-dehydrated in the first half, and the compression force by pushing the screw 5a in the second half. Dewatering by shear force by rotation, separating into dewatering sludge (cake) and drainage (separating liquid), discharging the wastewater from the drain port 5e, and discharging the dewatering sludge into the end of the transfer direction. It discharges from the dewatering sludge discharge port 5f provided in this.

Here, in order to effectively separate the discharge from the methane fermentation tank 4 into dewatering sludge and drainage, it is preferable that the screen diameter (or slit width) of the screw press 5 is 1 mm or less. In addition, when supplying the digested sludge to the screw press 5, as shown in FIG. 1, you may add the polymer flocculant liquid which mixed the polymer flocculent (d) and water (e). Thus, the sludge separated into solid-liquid becomes a dewatering sludge having a water content of about 70 to 80%.

Here, particularly preferred here is the solid-liquid separator as a screw press, but any concentrator or dehydrator having substantially the same effect and effect as the screw press may be used. For example, a multi-disc dehydrator may be used.

The sludge dryer 6 is for drying the dewatering sludge separated by solid-liquid separation by the screw press 5. Although the sludge dryer 6 may be a direct drying type, indirect drying type using steam f having a small amount of exhaust gas and easy to perform deodorization treatment is preferable considering that the installation place is in the basement of the apartment.

The dehumidifier 12 is for dehumidifying the dry flue gas from the sludge dryer 6 and dehumidifies the dry flue gas by the cooler 15.

The deodorizer 13 is for deodorizing the dehumidifying gas from the dehumidifier.

The drain pit 7 stores the waste water once solid-liquid separated by the screw press 5 once.

The wastewater treatment facility 8 is for preliminarily purifying wastewater from the drainage pit 7, and includes a flow rate adjusting tank 8a, an aeration tank 8b, and a precipitation tank 8c. have. The flow rate adjustment tank 8a is for adjusting the flow volume of the drainage from the drainage pit 7, and the aeration tank 8b aerations the wastewater from the flow rate adjustment tank 8a with the air from the blower B and is aerobic. The sedimentation tank 8c is for carrying out solid-liquid separation of the processed material from the aeration tank 8b. This settling tank 8c returns the surplus sludge settled to the bottom part to the storage tank 3, and supplies supernatant water to the process water pit 16. As shown in FIG.

The desulfurization tower 9 is for desulfurizing the biogas generated in the methane fermentation tank 4.

The gas holder 10 is for storing the desulfurized biogas desulfurized at the desulfurization tower 9 once. The gas holder 10 is connected with a line L2 for mixing desulfurized biogas with natural gas g.

The surplus gas combustion device 11 is for burning surplus gas in desulfurized biogas.

Next, the effect | action of the waste processing apparatus 100 comprised in this way is demonstrated. The food waste a put into the collection box 1 is soluble in the storage tank 3, and this solubilized food waste is introduced into the methane fermentation tank 4, and the horizontal stirrer 4r Methane fermentation is carried out efficiently by stirring with the stirring blade 4d.

Here, the tank lower portion 4b is configured to have a downward slim shape that becomes thinner as it goes downward in the axial direction, and the downward slim shape extends in the axial direction. And the foreign matter settle down along the downward slim shape, and are easily led to the screw 4y at the bottom of the tank. Here, when the downward slim shape is steeply inclined so that the inclined surface is erected, the fire sludge and the foreign matter are guided to the screw 4y more easily.

The fire sludge and heavy foreign substances guided to the bottom part of the tank are forcibly scraped toward the discharge port 4j without being deposited by the driving of the screw 4y, and discharged from the discharge port 4j as discharge. . Thus, by using the rake apparatus 4x, the sludge and heavy foreign matter are reliably discharged from the methane fermentation tank 4. However, the discharge port 4j is set to a size which is not clogged even with a large weight foreign matter.

In scraping by this screw 4y, the groove 4c which accommodates the lower side of the screw 4y in the bottom part of a tank becomes groove shape along the external shape of the lower side of the screw 4y. Since the dead space between the tank and the screw 4y is reduced, the fire sludge and the foreign matter are discharged from the discharge port 4j more reliably without remaining in the tank.

The discharge | emission from the discharge port 4j of the methane fermentation tank 4 is isolate | separated into dewatering sludge and wastewater by the screw press 5. In this screw press 5, since it is the structure which limits (blocks) the pressure which acts from the methane fermentation tank 4, it functions as a stopper, and discharge | emission from the methane fermentation tank 4 does not overflow, and thereby methane fermentation tank 4 Solid-liquid separation is performed satisfactorily without lowering the liquid level. In this regard, when a belt press dehydrator, a centrifugal dehydrator, or the like is used, there is no stopper function for limiting the pressure acting on the methane fermentation tank 4, so that the discharge from the methane fermentation tank 4 overflows and the The problem arises that the face drops.

Moreover, in this screw press 5, since the pressure acts only as much as the liquid level of the methane fermentation tank 4 inside, it becomes easier to carry out solid-liquid separation than usual.

And the dewatering sludge which was isolate | separated favorably by the screw press 5 is dried by the sludge dryer 6, and a dried sludge is used as compost h.

On the other hand, the dry exhaust gas generated in the sludge dryer 6 is dehumidified by the dehumidifier 12, deodorized by the deodorizer 13, and discharged to the atmosphere.

The drainage from the screw press 5 is once stored in the drainage pit 7 and then supplied to the wastewater treatment facility 8. This drainage is adjusted in the flow rate adjustment tank 8a, aerated in the aeration tank 8b, solid-liquid separated in the settling tank 8c, and the surplus sludge is returned to the storage tank 3 for reprocessing, while The supernatant water is once stored in the treated water pit 16 and then provided to the rear end.

Further, the biogas generated in the methane fermentation tank 4 is desulfurized in the desulfurization tower 9 and then stored in the gas holder 10 once, and the desulfurized biogas is mixed with the natural gas g through the line L2. In the cogeneration facility, it is converted into energy such as electricity, steam, and hot water and supplied into the apartment.

As described above, in the present embodiment, heavy foreign matter in the food waste that has settled at the bottom of the methane fermentation tank 4 without using a pump that causes clogging and requires a large power is applied to the rake device 4x. By the screw (rake part) 4y of), it is scraped in one direction without being deposited, and is discharged from the discharge port 4j without causing a problem of blockage. For this reason, it is possible to reliably discharge heavy foreign material from the methane fermentation tank 4, trying to save power.

FIG. 5: is a block diagram which shows the methane fermentation tank which comprises the waste processing apparatus which concerns on other embodiment of this invention, FIG. 5 (a) is a side cross-sectional block diagram of a methane fermentation tank, and FIG. 5 (b) is a methane fermentation tank Is a front cross-sectional configuration diagram.

The methane fermentation tank 14 of this embodiment differs from the methane fermentation tank 4 shown in FIG. 2 by connecting the upper part and the middle part 4a which are provided in the upper part of the lower part 4b, and form substantially semi-cylindrical shape. It replaces with the upper part and the middle part 14a of the shape which opened the cylindrical bottom part.

It goes without saying that even using the methane fermentation tank 14 configured in this manner, it has the same effect and effect as the methane fermentation tank 4 shown in FIG. 2.

Fig. 6 is a structural diagram showing a bottom portion of a methane fermentation tank constituting a waste treatment apparatus according to still another embodiment of the present invention, and the following structures shown in Figs. 6 (a) to 6 (d) may be adopted. good.

The methane fermentation tank 24 shown in FIG. 6 (a) has no groove 4c at the bottom of the methane fermentation tank 4 shown in FIG. The methane fermentation tank 34 shown in FIG. 6 (b) slightly expands the width of the bottom of the methane fermentation tank 24 shown in FIG. 6 (a), and the screw (lake portion) 4y in the widthwise direction is in the width direction. It is plural juxtaposition. The methane fermentation tank 44 shown to FIG. 6 (c) has the structure which has the groove 44c along the external shape of the lower side of the screw 4y provided in parallel with the bottom part of the methane fermentation tank 34 shown to FIG. 6 (b). I did it. In the methane fermentation tank 54 shown in FIG. 6 (d), the lower part of the methane fermentation tanks 4 and 14 shown in FIG. 2 and FIG. 5 is made into the lower part of the wide width which extended the upper part and the middle part 4a, 14a as it is. The wide bottom portion is provided with a plurality of screws 4y in the width direction. However, in the methane fermentation tank 54 shown to FIG. 6 (d), similarly to the methane fermentation tank 44 shown to FIG. 6 (c), the groove 44c along the external shape of the lower side of the screw 4y provided together is provided. It may be provided at the bottom of the bath.

As mentioned above, although this invention was concretely demonstrated based on the embodiment, this invention is not limited to the said embodiment, For example, in the said embodiment, although it is especially desirable, waste is made into food waste, Food and drink Applicable for waste other than waste.

In addition, the shape of a methane fermentation tank is not limited to the shape of the said embodiment, For example, shapes, such as a hexagonal cylinder, may be sufficient.

In addition, the structure provided with a rake apparatus is applicable also to what is called a vertical methane fermentation tank.

Moreover, in the said embodiment, although the bottom part of a methane fermentation tank and the upper part (upper part, middle part, and lower part) are integrated together, you may make it weld welding by making a bottom part separate, and also by making a flange connection etc. Also good.

Thus, according to the waste disposal apparatus which concerns on this invention, it becomes possible to discharge | emit heavy foreign material reliably from a methane fermentation tank, while saving power.

Claims (6)

A waste treatment apparatus having a methane fermentation tank for methane fermenting introduced wastes, The methane fermentation tank includes a rake device having a rake portion for scraping a heavy foreign material in the waste settled in the bottom of the tank toward one direction; And a discharge port for discharging the heavy foreign material scraped out in one direction by the rake device. The method according to claim 1, The lower part of the jaw is configured in a downward slim shape that is thinner as it goes downward in the one direction, and the downward slim shape extends in the one direction. Waste treatment apparatus, characterized in that arranged in the bottom portion of the lower slim tank, the rake portion of the rake device extends in the one direction. The method according to claim 1 or 2, The bottom part of the said tank is a waste disposal apparatus characterized by the groove shape along the outer shape of the lower side of the said rake part of the said rake apparatus. The method according to any one of claims 1 to 3, The rake portion of the rake device, waste treatment apparatus, characterized in that the screw extending in the one direction. The method according to any one of claims 1 to 4, And a solid-liquid separation device for solid-liquid separation of the discharge from the discharge port, directly below the discharge port of the methane fermentation tank. The method according to claim 5, The solid-liquid separator is a waste press, characterized in that the screw press.

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