JP7429117B2 - Organic matter treatment equipment, biogas generation system, and wastewater heating equipment - Google Patents

Description

One embodiment of the present invention relates to an organic matter treatment device, a biogas generation system, and a wastewater heating device. In particular, it relates to an organic matter treatment device used for pretreatment of activated sludge treatment using microorganisms.

2. Description of the Related Art Conventionally, activated sludge treatment methods have been known in which organic matter contained in organic wastewater such as sewage and industrial wastewater is decomposed by microorganisms and discharged as surplus sludge. Large amounts of surplus sludge are discharged from facilities using activated sludge treatment methods, but the rising cost of disposal and the decrease in the number of final disposal sites (landfills) have become problems. As a solution to such problems, Patent Document 1 discloses a technique in which ultrasonic treatment is performed as a solubilization treatment on surplus sludge generated by treatment in an aeration tank, and then the sludge is returned to the aeration tank again. has been done.

Japanese Patent Application Publication No. 2012-45884

The technique described in Patent Document 1 describes heating sludge before ultrasonication in order to increase the solubilization efficiency of ultrasonication. Specifically, Patent Document 1 describes that before the solubilization treatment, sludge is heated in advance in a heat exchanger equipped with a heater, and the proteins in the sludge are changed into a state that is easily destroyed by ultrasonic waves. has been done.

However, in the technology described in Patent Document 1, the sludge solubilizer performs ultrasonic treatment on sludge heated to around 70 degrees, so there is a problem that the sludge cannot be returned to the aeration tank as it is. . In other words, the microorganisms used in the aeration tank cannot withstand temperatures above 60 degrees, so when returning the sludge to the aeration tank, it is necessary to cool the sludge to a temperature that does not affect the microorganisms. In the technique described in Patent Document 1, sludge is cooled with a heat exchanger equipped with a heater.

Further, the technique described in Patent Document 1 has a problem in that it can only be applied to solubilization treatment using ultrasonic waves. In other words, since sludge heated to about 70 degrees Celsius is directly supplied to the sludge solubilization device, the technique described in Patent Document 1 cannot be applied to solubilization treatment using microorganisms.

One of the objects of an embodiment of the present invention is to provide an organic matter treatment device that can perform efficient solubilization treatment using microorganisms.

One of the objects of an embodiment of the present invention is to provide an organic substance treatment apparatus that can perform efficient solubilization treatment without the need to separately provide a cooling device.

An organic matter treatment device according to an embodiment of the present invention includes a sewage heating device that heats sewage using a coil heater provided inside a tank main body, and a sewage heating device that is connected to a downstream stage of the sewage heating device to remove organic matter using microorganisms. a sludge solubilization device for decomposition, the sewage heating device maintains the temperature of the sewage inside the coil heater at 55 degrees or more and 90 degrees or less, and maintains the temperature of the sewage at the treated water discharge port provided in the tank body. Keep the temperature of wastewater below 50 degrees.

A biogas generation system in one embodiment of the present invention includes the organic matter treatment device and a biogas generation device connected to a downstream stage of the organic matter treatment device.

A sewage heating device according to an embodiment of the present invention includes a coil heater provided inside a tank body, and maintains the temperature of the sewage inside the coil heater at 55 degrees or more and 90 degrees or less, and The temperature of wastewater at the provided treated water outlet is maintained at 50 degrees or less.

In the sewage heating device, when viewed from above, the distance L from the outer edge of the coil heater to the tank body is 0.5×D≦L≦2.0×D (where D is the inner diameter of the coil heater). Preferably, 0.75×D≦L≦1.5×D).

In the sewage heating device, at least a portion of the tank body may be made of a metal material.

The sewage heating device may further include a return device that returns the treated water discharged from the treated water discharge port to the inside of the tank body.

FIG. 1 is a schematic diagram showing the configuration of a biogas generation system according to a first embodiment. It is a top view showing the composition of the wastewater heating device of a 1st embodiment. FIG. 3 is a cross-sectional view of the sewage heating device shown in FIG. 2 taken along line AA. FIG. 3 is a cross-sectional view of the sewage heating device shown in FIG. 2 taken along line BB. It is a top view which shows the structure of the wastewater heating apparatus of 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings and the like. However, the present invention can be implemented in various forms without departing from the scope thereof, and should not be construed as being limited to the contents described in the embodiments exemplified below. In order to make the explanation more clear, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but these are merely examples and do not limit the interpretation of the present invention. It's not something you do. In this specification and each of the drawings, elements having the same functions as those described with respect to the existing drawings may be denoted by the same reference numerals, and redundant explanation may be omitted.

As used herein, "biogas" refers to gas obtained by decomposing organic matter using microorganisms. Examples of biogas include gases that can be used for energy, such as methane gas and hydrogen.

<First embodiment>
[Biogas generation system configuration]
FIG. 1 is a diagram showing the configuration of a biogas generation system 100 according to the first embodiment. The biogas generation system 100 of this embodiment includes at least a sewage heating device 105, a sludge solubilization device 110, and a biogas generation device 120. In addition, the biogas generation system 100 of this embodiment includes an alkaline solution tank 115, a water seal trap 125, and a cleaning trap 130. Biogas generated by the biogas generation system 100 is accumulated in the gas buffer 135. The biogas accumulated in the gas buffer 135 is used as fuel for hot water boilers, micro gas turbines, gas engines, etc. However, the example shown in Figure 1 is only one example, and is not limited to this example.

The sewage heating device 105 is a device that heats sewage (water to be treated) containing organic matter such as sewage, human waste, kitchen garbage, and factory waste liquid. The waste water is heated using a coil heater 106. In this embodiment, the wastewater heating device 105 heats the wastewater to a temperature of 55 degrees or more and 90 degrees or less (preferably 65 degrees or more and 70 degrees or less), and finally 50 degrees or less (preferably 45 degrees or less). (below) before releasing it from the equipment. The treatment by the sewage heating device 105 has the purpose of maintaining the temperature inside the tank of the sludge solubilization device 110 connected to the subsequent stage from 40 degrees to 50 degrees, and also has the purpose of decomposing proteins among organic substances contained in the sewage. have.

The sludge solubilization device 110 is a device that performs a process of denaturing high-molecular organic matter contained in sewage into low-molecular organic matter using microorganisms (solubilizing bacteria). Sewage discharged from the sewage heating device 105 at around 45 degrees is directly supplied to the sludge solubilization device 110. In the sludge solubilizer 110, high-molecular organic matter is treated by microorganisms and denatured into lower organic acids such as acetic acid. Therefore, the sludge solubilizer 110 is also called an acid generator. Details of the sludge solubilizer 110 will be described later.

The sewage treated by the sludge solubilizer 110 is maintained at 40 to 50 degrees inside the treatment tank. In this embodiment, the wastewater heating device 105 locally heats the wastewater to a temperature exceeding 60 degrees, and finally supplies it to the downstream sludge solubilization device 110 at a temperature of 50 degrees or less. Therefore, the wastewater in the sludge solubilizer 110 is maintained at a temperature of 40 degrees to 50 degrees. Furthermore, since organic substances such as proteins in the sewage are decomposed by the heat treatment in the sewage heating device 105, the efficiency of the organic substance solubilization treatment (low molecular weight treatment) in the sludge solubilization device 110 can be increased. Furthermore, by decomposing the organic matter in advance in the sewage heating device 105, effects such as a reduction in the amount of residue when the organic matter is solubilized in the sludge solubilization device 110 can be obtained.

The sludge solubilization device 110 of this embodiment includes a circulation pump 111 for circulating sewage in the tank and a PH meter 112 for measuring the PH value of the sewage. That is, the sludge solubilization device 110 can check the change in pH value over time while circulating the wastewater in the tank using the circulation pump 111.

The alkaline solution tank 115 is a tank that stores an alkaline solution for adjusting the pH of the sludge solubilizer 110. As the alkaline solution, for example, sodium hydroxide can be used, but the alkaline solution is not limited thereto. As described above, in the sludge solubilizer 110, the pH value is periodically measured. If it is determined that the inside of the sludge solubilizer 110 is biased towards acidity based on the measured pH value, an appropriate amount of alkaline solution is supplied to the sludge solubilizer 110 from the alkaline solution tank 115. The amount of alkaline solution supplied is adjusted using a flow rate adjustment pump 116.

In this embodiment, the sewage heating device 105, the sludge solubilizing device 110, and the alkaline solution tank 115 are collectively referred to as an organic matter treatment device 200. The organic matter treatment device 200 is a pretreatment device for denaturing organic matter in wastewater supplied to the biogas generation device 120 into a state that can be easily treated by the biogas generation device 120. Note that the organic matter treatment device 200 may include at least the sewage heating device 105 and the sludge solubilization device 110, and the alkaline solution tank 115 may be omitted. Further, the circulation pump 111 and the PH meter 112 provided in the sludge solubilization device 110 are not essential components and can be omitted.

The biogas generation device 120 is a treatment tank that decomposes organic matter using anaerobic microorganisms. Sewage whose organic matter has been solubilized in the sludge solubilizer 110 is supplied to the biogas generator 120 connected to the subsequent stage. In the biogas generation device 120, organic substances such as lower organic acids are processed by anaerobic microorganisms and decomposed into methane gas, carbon dioxide, hydrogen, and the like. In this embodiment, a UASB (Upflow Anaerobic Sludge Bed) type anaerobic treatment device is used as the biogas generation device 120. The biogas generator 120 has a biological sludge bed 121 in which anaerobic microorganisms capable of methane fermentation are pulverized and held at high density. The particulate anaerobic microorganisms exist in the treatment tank as black granular bodies called granules, and the aggregate of the granules functions as the biological sludge bed 121. In this embodiment, anaerobic microorganisms are used as an example, but aerobic microorganisms may also be used.

The treated water released from the biogas generator 120 is sent to the water seal trap 125. In the water seal trap 125, gas mixed into the treated water is removed.

Gas produced by biogas generator 120 is sent to wash trap 130. In the cleaning trap 130, slaked lime is used to convert carbon dioxide into calcium carbonate. When the ratio of carbon dioxide concentration decreases, the concentration of methane gas increases relatively, so it is possible to obtain methane gas with a high concentration comparable to that of city gas. Therefore, the wash trap 130 is also called a reformer.

Finally, the highly concentrated methane gas generated in the cleaning trap 130 is accumulated in the gas buffer 135. Since the methane gas generated by the biogas generation system 100 of this embodiment has a concentration equivalent to that of city gas, there is no need to use equipment dedicated to biogas when using it, and general equipment compatible with city gas can be used. be able to.

In this embodiment, the biogas generation system 100 for generating methane gas from organic waste is illustrated, but this is just an example. In other words, the configuration of the biogas generation system 100 may be changed as appropriate depending on the type of biogas to be extracted from organic waste, as long as the basic structure of the biogas generation device 120 described below does not change. For example, in recent years, attempts have been made to generate hydrogen power using residues such as pineapple peels. The biogas generation system 100 of this embodiment can also be used as a system for extracting hydrogen as biogas from organic waste.

[Configuration of organic matter treatment equipment]
FIG. 2 is a plan view showing the configuration of the wastewater heating device 105 of the first embodiment. FIG. 3 is a cross-sectional view of the wastewater heating device 105 shown in FIG. 2 taken along line AA. FIG. 4 is a cross-sectional view of the wastewater heating device 105 shown in FIG. 2 taken along line BB.

The sewage heating device 105 includes a tank body 201, a raw water supply port 202, a treated water discharge port 203, a first rectification chamber 210, a second rectification chamber 220, an adjustment chamber 230, a third rectification chamber 240, a heating chamber 250, and a fourth rectification chamber. It includes a chamber 260 and a treated water chamber 270. However, the configuration of the wastewater heating device 105 is not limited to the example shown in FIG. 2. The configuration can be changed as appropriate depending on the type of wastewater to be treated.

The tank body 201 is a member that functions as a frame of the sewage heating device 105, and is constructed using materials such as concrete, reinforcing bars, steel frames, metals, or resins, or a structure made of a composite thereof. In particular, in this embodiment, it is preferable to configure the tank body 201 using a metal material with a high heat dissipation effect. The tank body 201 includes an outer frame 21a and partition frames 21b to 21g. The partition frames 21b to 21g are arranged inside the outer frame 21a, and divide the inside of the outer frame 21a into each room.

The raw water supply port 202 is a part that supplies raw water (unheated wastewater) from a facility (for example, a regulating tank, etc.) located on the upstream side. The treated water discharge port 203 is a part that discharges treated water (sewage after heating) to a facility located on the downstream side (in this embodiment, the sludge solubilizer 110). As described above, this embodiment is designed so that the temperature of the treated water at the treated water discharge port 203 is 50 degrees or less.

The wastewater supplied from the raw water supply port 202 moves from the first rectification chamber 210 to the second rectification chamber 220 over the partition frame 21b. As shown in FIG. 3, the upper end of the partition frame 21b is located below the water surface, and substantially functions as a weir. As shown in FIGS. 2 and 3, the wastewater that has moved to the second rectification chamber 220 passes through the circulation hole 21ca provided in the partition frame 21c and moves to the adjustment chamber 230.

A return pipe 235 is arranged in the adjustment chamber 230. The return pipe 235 has a structure in which a cylindrical member 23b having an upwardly open end is provided at the end of the pipe 23a. When the water level of the waste water is higher than the open end of the cylindrical member 23b, the waste water flows into the return pipe 235. In this way, the return pipe 235 has the function of adjusting the water level in the adjustment chamber 230. The cylindrical member 23b is slidable in the vertical direction. The water level can be adjusted by adjusting the position of the cylindrical member 23b. Return pipe 235 is also called an overflow pipe.

The wastewater whose water level has been adjusted in the adjustment chamber 230 moves to the third rectification chamber 240 beyond the partition frame 21d. A V-notch 21da is provided at the upper end of the partition frame 21d. The wastewater moves to the third rectification chamber 240 via the V-notch 21da.

In the third rectification chamber 240, a communication hole 21ea is provided in the partition frame 21e. The wastewater in the third rectification chamber 240 moves to the heating chamber 250 via the circulation hole 21ea. Although not shown in FIG. 2, a current plate 265 (see FIGS. 3 and 4) having a plurality of through holes is arranged below the heating chamber 250. As the current plate 265, for example, a sheet-like member (referred to as punching metal or the like) having through holes formed in a metal plate or a plastic plate can be used. Although FIGS. 2 and 3 show an example in which the current plate 265 is supported using the outer frame 21a and the partition frames 21e and 21f, the present invention is not limited to this example. The current plate 265 may be supported. As shown in FIG. 4, the communication hole 21ea is provided below the current plate 265 arranged in the heating chamber 250. Therefore, the wastewater that has passed through the flow holes 21ea flows below the current plate 265.

The wastewater that has flowed below the current plate 265 passes through a plurality of through holes (not shown) provided in the current plate 265 and moves upward to the heating chamber 250. In this way, the rectifying plate 265 has a rectifying effect and forms an upward flow inside the heating chamber 250. Moreover, as shown in FIG. 2, in this embodiment, the circulation hole 21ea and the circulation hole 21fa are provided so that the dirty water moves diagonally across the heating chamber 250.

As shown in FIG. 1, the coil heater 106 is arranged in the heating chamber 250. In the wastewater heating device 105 of this embodiment, coil heaters 106a to 106f are arranged in a heating chamber 250. In addition, when there is no need to distinguish each coil heater, they are collectively referred to as coil heaters 106. Further, in this embodiment, an example in which six coil heaters 106 are provided is shown, but the number of coil heaters 106 to be arranged is not limited to this example.

When the wastewater that has moved to the heating chamber 250 becomes an upward flow and moves above the heating chamber 250, it passes inside each of the coil heaters 106a to 106c. The coil heater 106 is composed of a coiled pipe, and heated gas flows inside the pipe. Gas flowing into the coil heater 106 is supplied through the gas inflow pipe 255a, and flows out through the gas outflow pipe 255b. In other words, the coil heater 106 is configured such that heated gas is constantly circulated inside the coil heater 106. Thereby, in the heating chamber 250, the coil heater 106 heats the dirty water.

In this embodiment, as shown in FIG. 2, a coil heater 106 having a circular outer edge is used. Therefore, the inside of the coil heater 106 (for example, the shaded area 30 in the coil heater 106a) is heated evenly by the heat radiated from the piping that constitutes the coil heater 106, so that the temperature distribution of the waste water is biased. There is no. However, the shape of the coil heater 106 is not limited to a circular shape, and may be a polygonal shape in a plan view.

The temperature of the waste water inside the coil heater 106 can be maintained at 55 degrees or more and 90 degrees or less (preferably 65 degrees or more and 70 degrees or less) by adjusting the temperature of the gas flowing inside the coil heater 106. That is, in the area inside the coil heater 106, the organic matter contained in the sewage is heated to a temperature of 55 degrees or more and 90 degrees or less, so that the proteins in the sludge are efficiently decomposed into lower fatty acids and the like.

On the other hand, the temperature of the wastewater outside the coil heater 106 (for example, the area around the coil heater 106a) becomes lower as the distance from the coil heater 106 becomes lower than that of the wastewater inside the coil heater 106. In particular, in the area close to the tank body 201, the temperature tends to drop due to the heat dissipation effect of the tank body 201. This tendency is particularly noticeable when a metal material is used for at least a portion of the tank body 201 (specifically, a portion constituting the heating chamber 250). Therefore, the temperature of the wastewater heated to a temperature of 60 degrees or higher inside the coil heater 106 is lowered by mixing with the wastewater around the coil heater 106.

In this way, the heating chamber 250 of this embodiment is configured to leave a distance between the tank body 201 and the coil heater 106 so that the temperature distribution is uneven in the room. As a specific example, in this embodiment, as shown in FIG. 2, the distance L from the outer edge of the coil heater 106 to the tank body 201 (specifically, the outer frame 21a, the partition frames 21e to 21g, etc.) is When the inner diameter of the coil heater 106 is D, it is designed to satisfy 0.5×D≦L≦2.0×D (preferably, 0.75×D≦L≦1.5×D). . However, this numerical range is just an example, and can be adjusted as appropriate in consideration of the temperature of the waste water inside the coil heater 106, the material of the tank body 201, etc.

Finally, in the wastewater heating device 105 of this embodiment, the wastewater heated at a temperature of 60 degrees or more and 90 degrees or less in the heating chamber 250 can be heated to 50 degrees at the treated water discharge port 203 without requiring any particular cooling equipment. It is sufficient if it is designed to have a temperature of 45 degrees or less (preferably 45 degrees or less).

The sewage heated in the heating chamber 250 moves to the fourth rectification chamber 260 while mixing with the low temperature sewage flowing around the coil heater 106 . The wastewater heated in the heating chamber 250 moves to the fourth rectification chamber 260 via the distribution hole 21fa provided in the partition frame 21f. In the fourth rectification chamber 260, the temperature of the wastewater may be measured using a water thermometer or the like. In that case, the temperature of the gas flowing inside the coil heater 106 can be adjusted by feeding back the measurement results of the water thermometer.

The wastewater that has moved to the fourth rectification chamber 260 moves to the treated water chamber 270 via the circulation hole 21ga provided in the partition frame 21g. The wastewater (treated water after heat treatment) that has moved to the treated water chamber 270 is discharged to the outside of the apparatus through the treated water discharge port 203. As shown in FIG. 1, the discharged treated water is directly supplied to the sludge solubilizer 110 connected to the latter stage. As mentioned above, the wastewater heating device 105 of this embodiment heats wastewater at a temperature of 60 degrees or higher, but when discharging the wastewater outside the device, the temperature of the wastewater is kept at 50 degrees or lower. Designed. Therefore, even if the discharged treated water is directly supplied into the sludge solubilizer 110, the microorganisms in the sludge solubilizer 110 are not affected.

As described above, in the sewage heating device 105 of this embodiment, by intentionally creating temperature unevenness (unbalanced temperature distribution) inside the heating chamber 250, the sewage water reaches the treated water discharge port 203. The structure is such that the temperature naturally decreases. As a result, in the heating chamber 250, the temperature of the waste water inside the coil heater 106 is maintained at 60 degrees or more and 90 degrees or less (preferably 65 degrees or more and 70 degrees or less), and the treated water discharge provided in the tank body 201 is The temperature of the wastewater at the outlet 203 can be set to 50 degrees or less (preferably 45 degrees or less).

(Modified example)
In the wastewater heating device 105 of this embodiment, fins may be provided in a portion of the tank body 201 that constitutes the outer frame 21a of the heating chamber 250. A fin is a heat dissipation structure in which a plurality of protrusions are arranged side by side to expand the heat transfer area. In this case, the fins may be formed by processing a part of the tank body 201 without separately providing a complicated cooling device. This makes it easier to lower the temperature of the wastewater near the outer frame 21a that constitutes the heating chamber 250. Therefore, by increasing the set temperature of the coil heater 106, it is possible to increase the decomposition efficiency of organic matter in wastewater.

<Second embodiment>
In this embodiment, an example will be described in which the wastewater heating device 105 described in the first embodiment is further provided with a return device 280 that returns the treated water discharged from the treated water discharge port 203 to the inside of the tank body 201. . Note that the same elements as those in the wastewater heating device 105 of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

FIG. 5 is a plan view showing the configuration of a wastewater heating device 105a according to the second embodiment. The wastewater heating device 105a includes a return device 280 that is connected to the treated water discharge port 203 and returns the discharged treated water to the first rectification chamber 210. Specifically, the return device 280 includes a circulation pump 281 and a return pipe 282. However, the present invention is not limited to this example, and the return device 280 may include a water temperature meter or a flow meter.

In the heating chamber 250, organic substances that have passed inside the coil heater 106 are heated to a temperature of 60 degrees or higher, but organic substances that have not passed inside the coil heater 106 are discharged as treated water. In this embodiment, the return device 280 is used for the purpose of increasing the probability that the treated water passes inside the coil heater 106 by returning the treated water to the room before the heating chamber 250 (here, the first rectification chamber 210). It is set up.

According to the present embodiment, more organic matter can be decomposed and sent to the downstream sludge solubilizer 110 than in the first embodiment, so the processing load on the sludge solubilizer 110 is reduced compared to the first embodiment. can do.

The embodiments of the present invention and their modifications can be implemented in appropriate combinations as long as they do not contradict each other. Based on the above-described embodiments, a person skilled in the art may appropriately add, delete, or change the design of components, or add, omit, or change the conditions of a process, and still have the gist of the present invention. It is within the scope of the present invention.

Furthermore, even if there are other effects that are different from those brought about by the aspects of the embodiments described above, those that are obvious from the description of this specification or that can be easily predicted by those skilled in the art will, of course, be explained. is understood to be brought about by the present invention.

21a... Outer frame, 21b to 21g... Partition frame, 21ca, 21ea, 21fa, 21ga... Distribution hole, 21da... Notch, 23a... Piping, 23b... Cylindrical member, 100... Biogas generation system, 105, 105a... Sewage heating Apparatus, 106, 106a to 106f...Coil heater, 110...Sludge solubilization device, 111...Circulation pump, 112...PH meter, 115...Alkaline solution tank, 116...Flow rate adjustment pump, 120...Biogas generation device, 121...Biology Sludge bed, 125... water seal trap, 130... washing trap, 135... gas buffer, 200... organic matter treatment device, 201... tank body, 202... raw water supply port, 203... treated water discharge port, 210... first rectification chamber, 220...Second rectification chamber, 230...Adjustment chamber, 235...Return pipe, 240...Third rectification chamber, 250...Heating chamber, 255a...Gas inflow pipe, 255b...Gas outflow pipe, 260...Fourth rectification chamber, 265... Current plate, 270... Treated water chamber, 280... Return device, 281... Circulation pump, 282... Return pipe

Claims (11)

A sewage heating device including a heating chamber including a plurality of coil heaters and a rectification chamber downstream of the heating chamber inside a tank body;
A sludge solubilization device connected to the latter stage of the sewage heating device and decomposing organic matter using microorganisms,
A first flow port through which wastewater is supplied to the heating chamber is located below the coil heater,
A second flow port through which wastewater is supplied from the heating chamber to the rectification chamber is located above the coil heater. A sewage heating device including a heating chamber including a plurality of coil heaters and a rectification chamber downstream of the heating chamber inside a tank body;
A sludge solubilization device connected to the latter stage of the sewage heating device and decomposing organic matter using microorganisms,
A first flow port through which wastewater is supplied to the heating chamber is located below the coil heater,
A second flow port through which wastewater is supplied from the heating chamber to the rectification chamber is located above the coil heater,
The sewage heating device maintains the temperature of the sewage inside the coil heater at 55 degrees or more and 90 degrees or less, and maintains the temperature of the sewage at the treated water outlet provided in the tank body at 50 degrees or less. Organic matter processing equipment. In the sewage heating device, when viewed from above, a distance L from the outer edge of the coil heater to the tank body satisfies 0.5×D≦L≦2.0×D, where D is the inner diameter of the coil heater. The organic matter treatment apparatus according to claim 1 or 2. The organic matter treatment device according to any one of claims 1 to 3, wherein at least a portion of the tank body of the sewage heating device is made of a metal material. The organic matter treatment device according to claim 2 , wherein the wastewater heating device further includes a return device that returns the treated water discharged from the treated water discharge port to the inside of the tank main body. The organic matter treatment device according to any one of claims 1 to 5,
a biogas generation device connected to a downstream stage of the organic matter processing device;
A biogas generation system equipped with A heating chamber including a plurality of coil heaters and a rectification chamber downstream of the heating chamber are provided inside the tank body,
A first flow port through which wastewater is supplied to the heating chamber is located below the coil heater,
A second distribution port through which wastewater is supplied from the heating chamber to the rectification chamber is located above the coil heater. A heating chamber including a plurality of coil heaters and a rectification chamber downstream of the heating chamber are provided inside the tank body ,
A first flow port through which wastewater is supplied to the heating chamber is located below the coil heater,
A second flow port through which wastewater is supplied from the heating chamber to the rectification chamber is located above the coil heater,
A sewage heating device that maintains a temperature of sewage inside the coil heater at 55 degrees or more and 90 degrees or less, and maintains a temperature of sewage at a treated water discharge port provided in the tank body at 50 degrees or less. The sewage heating device according to claim 8, further comprising a return device that returns the treated water discharged from the treated water discharge port to the inside of the tank main body. In a plan view, a distance L from the outer edge of the coil heater to the tank body satisfies 0.5×D≦L≦2.0×D, where D is the inner diameter of the coil heater. 9. The wastewater heating device according to any one of 9. The sewage heating device according to any one of claims 7 to 10, wherein at least a portion of the tank body is made of a metal material.

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