JPH0244000A - Safty device of methane fermentation treating equipment - Google Patents

Abstract

PURPOSE:To enhance safety by equipping a filter mechanism for removing impurities in gaseous methane generated in a fermentation tank, a water seal mechanism and an overflow mechanism. CONSTITUTION:When abnormal pressure acts on both a methane fermentation tank 1 and a gas holder 2, liquid level (f) is lowered to liquid level (b) and liquid level (g) is raised to liquid level (c). Water exceeding the liquid level (c) is passed through the pipelines 39, 35 from the upper end of the pipeline 39 and discharged through an overflow hole 36. Furthermore when pressure is raised and exceeds the maximum allowable pressure of the gas holder 2, water seal is broken and gaseous methane is passed under a lower end part 43 from a fourth chamber 19 and discharged to the atmosphere via a fifth chamber 20 and a pipeline 34. At sn abnormal time of negative pressure, a state is made reverse to this case. A pipeline for deciding the maximum allowable pressure of the methane fermentation tank 1 is provided to the final part of a water seal mechanism and safety is enhanced. Thereby trouble can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a safety device for a methane fermentation treatment equipment.

[Prior Art and Problems to Be Solved] Generally, methane fermentation is used to treat highly concentrated organic wastewater and to reduce the amount of excess sludge generated in activated sludge treatment.

A conventionally used methane fermentation treatment apparatus is, for example, as shown in the flow sheet shown in FIG.

That is, the methane gas generated in the methane fermentation tank 51 is temporarily stored in the gas holder 52 via lines 61 and 62 after impurities are removed by the filter 54.

The methane gas stored in the gas holder 52 is transferred to the line 6.
3.64, a flashback prevention device 57, and a line 65 to be supplied as fuel to the boiler 53 in the building 70.

During this series of methane gas flows, water contained in the methane gas is condensed due to a drop in temperature, and the condensed water is passed through a line 68.69 to a condensed water recovery device 55.5.
6, and are disposed of as appropriate.

In addition, in order to cope with pressure abnormalities between the methane fermentation device 51 and the gas holder 52, safety valves 58 and 59 for dealing with high pressure and/or negative pressure are connected to the methane fermentation tank 51 and the gas holder 52 through lines 66 and 67, respectively. It is provided.

However, with conventional methane fermentation equipment configured as described above, there are many devices that need to be inspected and managed, and maintenance is complicated, so relatively advanced operating techniques are required. In addition to requiring a lot of effort, inspection and management required a lot of effort.

In addition, because the devices that contribute to and control safety are scattered, there is a high risk of overlooking abnormalities in these devices.
It had safety issues.

This invention solves the problems of the conventional ones as described above, and aims to provide a safety device for a methane fermentation device that can be easily maintained and operated safely. It is something.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention supplies methane gas generated when methane fermentation is performed on high-concentration organic wastewater or surplus activated sludge in a methane fermentation tank, or supplies it to a boiler or temporarily stores it in a gas holder. A safety device for methane fermentation processing that stores methane gas and then supplies it to a boiler. A water seal mechanism that keeps the pressure within the normal range when either one of the gas holders becomes abnormally high or negative pressure, an overflow mechanism that discharges condensed water in methane gas, and a flashback prevention system that prevents flashbacks. The filter mechanism has a plurality of gravel layers, and the flashback prevention mechanism has a plurality of gravel layers, and the gravel layer also serves as the gravel layer of the filter mechanism. This method adopted the following methods.

In addition, methane gas generated when high-concentration organic wastewater or surplus activated sludge in a methane fermentation tank is subjected to methane fermentation treatment is supplied to the boiler, or methane gas is stored in a gas holder and then supplied to the boiler. A safety device for fermentation processing, which includes four partition walls arranged inside the main body of the safety device to divide the interior into five chambers, a first chamber, a second chamber, and a second chamber.
The lower portions of the chamber and the third chamber are communicated, and the lower portions of the fourth chamber and the fifth chamber are communicated, and a perforated plate is provided in the first chamber, the second chamber, and the third chamber above the bottom surface thereof. A gravel layer is formed on the upper surface, the first chamber is connected to the methane fermentation tank, the second chamber is connected to the gas holder, and the third chamber is connected to the boiler, and the fourth and fifth chambers are connected to the liquid chamber. A small hole is provided between the third chamber and the fourth chamber so that condensed water can be stored in the lower portions of the first, second and third chambers, and excess water is drained into the fourth and fourth chambers. A pipe is installed in the fourth chamber that opens at the static liquid level and communicates with the outside. The fifth chamber is provided with piping that opens at a water head position whose height from the lower end corresponds to the maximum allowable pressure of the gas holder, and the fifth chamber includes a partition between the fourth and fifth chambers. A pipe is provided that opens above the lower end of the wall and below the opening position of the pipe inside the fourth chamber, and this pipe is connected to the methane fermentation tank, and the second The room is equipped with a water supply pipe.

[Effect]

By adopting the above-mentioned means, the present invention allows impurities inside the methane gas to be removed by the filter mechanism, and is also transmitted to the gas holder or boiler.
In this process, it passes through the filter mechanism again, so filtration is performed twice.In addition, in the case of pressure abnormalities, the water seal mechanism prevents the pressure from going out of the predetermined range, and the condensed water in the methane gas It is discharged by the overflow mechanism, and furthermore, flashback is reliably prevented by the flashback prevention mechanism.

〔Example〕

Embodiments of the invention shown in the drawings will be described below.

FIG. 1 shows a flow sheet of the entire methane fermentation treatment apparatus in which the safety device 4 of the methane fermentation treatment apparatus according to the present invention is used. 4, and this safety device 4 is connected to the gas holder 2 via a line 6 and to a boiler 3 in a building 8 via a line 7.

The safety devices include a filter, a condensed hydroxide device, a flashback prevention device, and the like in FIG. 5 showing a conventional flow sheet.
and has the function of a safety valve.

2 to 4 show a safety device for a methane fermentation processing apparatus according to the present invention, in which FIG. 2 is a schematic plan view, FIG. 3 is a sectional view taken along the line ■-■ in FIG. 4, and FIG. FIG. 4 is a sectional view taken along the line IV--IV in FIG. 2.

First, partition walls 12, 13, 14, 15 are arranged inside the safety device main body 11, which is approximately rectangular and made of a non-combustible and highly corrosion-resistant material such as stainless steel or AT lining. A first chamber 16, a second chamber 17, a third chamber 1, a fourth chamber 19, and a fifth chamber 20 are formed between the partition walls 12, 13, 14 and 15.

The partition walls 12, 13 and 15 are in close contact with the safety device main body 11 at the top and three sides, and the bottom side is in close contact with the safety device main body 11.
The sides are structured so that they do not touch, and the partition wall 14 is connected to the safety device main body 1.
1 and all four sides are close together, but there is an opening 2 above the center.
1, and a small hole 22 in which a short tube is provided perpendicularly to the partition wall 14 at the lower center.

In addition, without forming the small hole 22 using a short tube,
It may be formed by drilling into the partition wall 14, but if it is assumed that fire passes through the small hole 22 in relation to the flashback prevention mechanism described later, it may be formed by drilling into the partition wall 14. If the small hole 22 is formed using a short pipe, the contact surface with the fire will be larger, so it can be expected that the fire will be extinguished by lowering the temperature.In this sense, it is preferable to form the small hole 22 with a short pipe. .

Then, as shown in FIG. 4, from the first chamber I6 to the third chamber 1
A perforated plate 23 whose total area is as large as possible is provided as the bottom plate up to 8, and this perforated plate 23 is arranged slightly higher than the small holes 22 provided in the partition wall 14.

In the first chamber 16, the upper part of the perforated plate 23 has an average diameter of about 5 to 20 mm and a filling height of about 150 to 30 mm.
A gravel layer 24 of 〇- degree is provided, and the second chamber 17 and the third chamber are
The chambers 18 and 18 are also provided with gravel layers 25 and 26, respectively.

The average diameter of the gravel filled in the gravel layer 25.26 is preferably the same as that of the gravel layer 24, or slightly smaller, and the filling height of the gravel layer 25.26 is approximately 100 to 20 mm.
The roughness is 0, and it may be lower than the gravel layer 24.

Furthermore, as the filler for the gravel layer 24, 25, 26, it is also possible to use materials other than gravel, regardless of the shape, as long as it is nonflammable and has a relatively high specific heat. The frequency of washing or replacing the .25 and 26 is approximately 3 years for gravel layer 24, and approximately 6 years for gravel layer N25.26.

A pipe 28 connecting to the methane fermentation tank 1 via a valve 27 is provided at the upper side of the first chamber 16.
A pipe 29 connecting to the gas holder 2 is provided at the upper side of the chamber 17, and a water supply pipe 32 is further connected to the top plate 30 via a valve 31.

A pipe 33 that connects to the boiler 3 in the building 8 is provided at the upper side of the third chamber 18 .

Near the top of the side surface of the fifth chamber 20, a piping 34 whose upper end is open to the atmosphere and has a sufficient height is provided.

Outside the fifth chamber 20 and in the vicinity of the fifth chamber 20, an overflow pipe 35 is provided upright, and an overflow hole 36 that is open to the atmosphere is provided at the upper end of the pipe 35.

Inside the fourth chamber 19, the upper end of the piping 38 rising perpendicularly to the bottom plate 37 is opened at a position slightly lower than the small hole 22, and inside the fifth chamber 20, the piping 38 is opened.
The upper end of a pipe 39 rising perpendicularly to the bottom plate 37 is located at a position slightly lower than the joint with the base plate 4, and the other ends of the pipe 38 and the pipe 39 are both communicated with the pipe 35.

Further, the fifth chamber 20 has an overflow hole 36 and a pipe 38.
One end of a pipe 40 rising perpendicularly to the bottom plate 37 is opened at a position slightly lower than the line connecting the upper end, and the other end of this pipe 40 is located closer to the methane fermentation tank than the valve 27.
It communicates with the side piping 28.

Note that the diameter of each of the pipes is approximately 15 to 30 mm.

Also, a top plate 3 covering the upper portions of the first chamber 16 to fourth chamber 19 is provided.
It is preferable that the top plate 41 covering the upper portions of the 0 and 5 chambers 20 has a flange structure so that the inside of the safety device main body 11 can be inspected by opening if necessary.

In this case, both top plates 30.41 may be on the same level,
The bottom plate 37 may also be on the same level as the bottom plate 42.

Further, the gap between the lower end 43 of the partition wall 15 of the fourth chamber and the bottom plate 37 is preferably as large as about 10 mm or more;
It is desirable to make the distance between 3 and liquid level a as small as possible.
It is best to set it to about 30 to 30 hours.

The safety device for the methane fermentation treatment equipment according to the present invention is configured as described above, and includes a filter mechanism for removing impurities from methane gas, and a water seal for dealing with pressure abnormalities of high pressure and/or negative pressure. A mechanism, an overflow mechanism that automatically discharges condensed water after collection, and a flashback prevention mechanism that includes a gravel tank and a water tank to suppress flashback combustion due to temperature drop.

First, to explain the filter mechanism, this filter mechanism is composed of a first chamber to a third chamber, and the methane gas flows from the methane fermentation tank 1 into the safety device main body 11 via the pipe 28 (5) and the valve 27. is filtered through a gravel layer 24 filled in the first chamber 16.

In this case, the methane gas is sometimes mixed with thin film-like sludge, blades, etc. that have dried and peeled off, so these impurities are removed. A gravel layer 25 is provided in the chamber 17, a gravel layer 26 is provided in the third chamber 18, and a perforated plate 23 is provided on the lower surface of the gravel layer 24.25.
A space is provided between the liquid surface a and the liquid surface a.

As a result, the methane gas that has flowed into the first chamber 16 passes through the gap between the perforated plate 23 and the liquid level a after passing through the gravel layer 24.
In one case, the liquid reaches the boiler 3 via the gravel layer 26 and piping 33 (7), and in another case, after passing through the gravel layer 24, it passes through the gap between the perforated plate 23 and the liquid level a, and passes through the gravel layer 25 and the piping 29 (6). Once stored in the gas holder 2, it passes from the gas holder 2 to the pipe 29 (6), the gravel layer 25, the gap between the perforated plate 23 and the liquid level a, and the gravel layer 26, and then passes through the pipe 33 (7) to the boiler 3. The flow will change in one of two ways, and the wave will pass through the gravel layer as a filter at least twice.

Therefore, by performing this filtration at least twice, misfires due to clogging in the boiler can be prevented.

In the above case, increasing the opening diameter of the small hole 22 means that the passage from the gravel tank 24 passes through the gap between the perforated plate 23 and the liquid level a, and from the small hole 22 to the fourth chamber 19, and further, the opening 21,
This is not preferable because the amount of once-filtered methane gas that moves to the boiler 3 via the pipe 33 (7) increases.

In addition, the water seal mechanism is for dealing with pressure abnormalities of high pressure and/or negative pressure, and is composed of piping 35, 38, 39, 40, a fourth chamber 19, and a fifth chamber 20. 2, determine the position of the liquid level C so that the water pressure from the same liquid level as the lower end 43 of the partition wall 15 to the liquid level C is equal to the maximum allowable pressure of the gas holder 2, and Keep the upper end of 39 aligned with the liquid level C.

Next, the static liquid level d and the liquid level e before operation are set approximately halfway between the liquid level C and the upper end of the pipe 38 and the overflow level of the overflow hole 36,
Further, the water areas of the fourth chamber 197 and the fifth chamber 20 are designed to be approximately equal.

The water seal mechanism as described above operates as follows.

That is, during operation, pressure acts on the liquid level d before operation according to the predetermined pressure between the methane fermentation tank 1 and the gas holder 2, the liquid level d falls and the liquid level e rises, and the methane fermentation tank The water head difference between the gas holder 1 and the gas holder 2 that is balanced to a predetermined pressure is, for example, a state of liquid level [ and liquid level g].

If abnormal pressure acts on the methane fermentation tank 1 and the gas holder 2 for some reason, for example, the liquid level f will fall to the liquid level, and the liquid level g will rise to the liquid level C and exceed the liquid level C. Water is discharged from the upper end of pipe 39 through pipe 39.35 and through overflow hole 36.

When the pressure increases further and exceeds the maximum allowable pressure of the gas holder 2, the water seal is broken and methane gas passes through the lower end 43 from the fourth chamber 19, passes through the fifth chamber 20, and the piping 34, and is released into the atmosphere. It has become.

In this case, if the length of the vertical pipe section of the pipe 35 is the liquid level, then the liquid level C
It is effective to make the length sufficiently longer than the length between.

On the other hand, if a negative pressure abnormality occurs, the liquid level positions in the fourth chamber 19 and the fifth chamber 20 will be opposite to those described above.

In other words, the liquid level C will fall and the liquid level d will rise, but since the upper end of the pipe 38 is open to the liquid level d, the liquid level d does not actually rise and exceeds the liquid level d. The water will be discharged from the overflow hole 36 via piping 38,35.

Also, when the liquid level e falls to the lower end 43, the water head difference formed between the lower end 43 and the liquid level d shows the maximum negative pressure, and even if a larger negative pressure occurs, the water seal will not break. 5th room 2
Since the air of 0 passes through the lower end portion 43 and flows into the fourth chamber 19, an increase in negative pressure is not caused.

Therefore, the water pressure corresponding to the head difference between the lower end portion 43 and the liquid level d is the maximum allowable negative pressure, and its absolute value is approximately half of the absolute value of the maximum allowable pressure of the gas holder 2.

In addition, at the end of the water sealing mechanism, there is a valve 27 in case you forget to open it during operation or the gravel layer 24 becomes clogged, and in order to determine the maximum allowable pressure of the methane fermentation tank l. A piping 40 is provided in which a portion is inside the safety device body 11 and most of it is exposed outside.

Since one end of this pipe 40 is open to the fifth chamber 20, the water head difference formed between the upper liquid level of the horizontal part of the pipe 40 and the liquid level C is maximum, and the pressure in the methane fermentation tank 1 exceeds that state. If the temperature rises, the water seal in the pipe 40 is broken, and methane gas is blown out from the methane fermentation tank l via the pipe 40 into the fifth chamber 20, and then released into the atmosphere via the pipe 34.

By determining the position of the liquid level here, the methane fermentation tank l
The maximum allowable pressure of the gas holder 2 is determined, and together with the maximum allowable pressure of the gas holder 2 and the maximum allowable negative pressure, it becomes possible to determine the structural strength conditions of all equipment and piping.

In the above-mentioned water seal mechanism, the pipe 32 having the valve 31 is connected to the upper part of the second chamber 17, which prevents the water seal from becoming incomplete due to lack of water due to evaporated water or overflow water. This can be reliably prevented by supplying a small amount of water continuously or intermittently.

Next, the overflow mechanism will be explained.

The overflow mechanism is for collecting and discharging condensed water, and therefore the safety device main body 1 is provided at the lowest position among all the equipment and piping in the flow sheet shown in FIG.

The moisture condensed due to the temperature drop on the way from the methane fermentation tank 1 to the safety device main body 11, that is, the condensed water, passes through the pipe 28 (5) and the valve 27 and naturally falls into the first chamber I.
6 and is filtered through the gravel layer 24 before falling into the water layer 44.・Similarly, from the gas holder 2 to the safety device body 1! The condensed water generated between the boiler 3 and the safety device main body 11 flows from pipe 29 (6) to gravel layer 25 and pipe 33 (7).
It naturally flows down to the water layer 44 via the gravel N26.

When the collected and filtered condensed water gathers, the liquid level a of the water layer 44 rises, and excess condensed water overflows from the small hole 22 into the fourth chamber.

Here, if the liquid levels of the fourth chamber ■9 and the fifth chamber 200 during operation are, for example, r and g, respectively, the firing tank overflows into the fourth chamber 19 while maintaining the liquid head difference. The liquid level f and the liquid level g rise by an amount corresponding to the amount of water.

In this case, if the condensed water is excessive, the liquid levels in the fourth chamber 19 and the fifth chamber 20 will approach d and C, respectively, and eventually the pipe 35 will be removed from the upper end of the pipe 38 and/or the pipe 39. After that, it is discharged from an overflow hole 36.

Next, the flashback prevention mechanism will be explained.

This backfire prevention mechanism needs to take into consideration not only fire outbreak near the boiler 3, but also fire outbreak from around the methane fermentation tank 1 or gas holder 2.
No matter which one of (5), 29(6), or 33 (7) the fire runs through, it must first pass through one of the gravel layers 24, 25, 26, and then the specific heat at room temperature The fire can be extinguished simply by the sudden drop in temperature as it passes through the large gravel layer.

And in case the fire still passes through the gravel layer,
The gap between the porous holes VI23 and the liquid level a is narrowed so that the fire can be extinguished even if the temperature drops due to the liquid level a.

In addition, if the fire propagates from the boiler 3 to the gas holder 2 and from this gas holder 2 to the methane fermentation tank 1 via the safety device, it has to pass through another gravel layer, so methane gas cannot be stored. Alternatively, the backfire phenomenon in which the fire runs toward its source can be reliably suppressed within the safety device main body 11.

Each member constituting each mechanism that functions as described above is also used. For example, the gravel layer 24, 25, 26 functions as a filter for methane gas, and also serves as a filter for condensed water.
It can also be used as a filler layer to prevent flashbacks.

In addition, the water 1 and 1 mechanisms in the fourth chamber 19 and the fifth chamber 20 can cope with abnormal pressure exceeding the maximum allowable pressure of the gas holder 2 and the methane fermentation tank 1. It is now possible to handle abnormal pressures that exceed the allowable negative pressure.

Furthermore, by providing a space between the perforated plate 23 provided at the bottom of the first chamber 16 to the third chamber 18 and the liquid level a, it can function as a flashback prevention surface for the liquid level. Since the flow of methane gas moving from the methane fermentation tank 1 to the gas holder 2, or from the methane fermentation tank 1 and/or gas holder 2 to the boiler 3 is free within the space, two pipes were conventionally required to be taken out from the gas holder 2. It is something that can be made into one piece from what you already have.

Furthermore, although methane gas containing odor components such as hydrogen sulfide generated in the methane fermentation tank 1 is released into the atmosphere through piping, a surplus methane gas combustion device is installed to detect the pressure of a gas holder or safety device. It is preferable that the excess methane gas is also used as a combustion device for automatically burning the excess methane gas before releasing it into the atmosphere.

Further, it is preferable to provide a desulfurization tower in the middle of the piping connected to the boiler so as not to supply the highly corrosive hydrogen sulfide contained in the methane gas to the boiler.

Note that, without configuring this invention as in the above embodiment, the first chamber may be in contact with both the second chamber and the third chamber, or the fourth or fifth chamber may be in contact with the first chamber. And/or it may be in contact with the second chamber, and the overall shape is not limited to a rectangular parallelepiped, but may be formed into a cylindrical shape, a spherical shape, or the like.

[Effects of the Invention] By configuring the present invention as described above, each function can be provided within the main body and the whole can be made compact, the number of piping can be reduced, and all the constituent members are Since it is fixed and has no moving parts, it has excellent effects such as fewer breakdowns and safety.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of the entire methane fermentation treatment equipment equipped with the safety device according to the present invention, FIG. 2 is a schematic plan view showing the safety device of the methane fermentation treatment equipment according to the present invention, and FIG. FIG. 4 is a schematic cross-sectional view taken along the line ``---'' in the figure, FIG. 4 is a schematic longitudinal sectional view taken along the TV--TV line in FIG. 2, and FIG. 5 is a conventional flow sheet. l, 51... Methane fermentation tank 2.52... Gas holder 3.53... Boiler 4... Safety device 5.6.7... ... Line 8 ... Building 11 ... Safety equipment body 12.13.14.15 ... Partition wall 16 ...
...First room 17...Second room 18...Third room 19...Fourth room 20...Fifth room 21... ... Opening 22 ... Small hole 23 ... Perforated plate 24.25.26 ... Gravel layer 27.31 ... Valve 28 , 29 , 32, 33. 34.35.38.39.40... Piping 30.
41...Top plate 36...Overflow hole 37.42...Bottom plate 43...Lower end portion 44...Water layer portion 54... ... Filter 55.56 ... Condensed water recovery device 57 ...
・Flashback prevention device

Claims (6)

[Claims] (1) Methane gas generated when high-concentration organic wastewater or surplus activated sludge in a methane fermentation tank is subjected to methane fermentation treatment is supplied to the boiler, or is stored in a gas holder and then supplied to the boiler. A safety device for methane fermentation treatment, the safety device includes a filter mechanism that removes impurities from methane gas generated in the methane fermentation tank;
At least a water seal mechanism that keeps the pressure within a normal range when either the methane fermentation tank or the gas holder becomes abnormally high pressure or negative pressure, an overflow mechanism that discharges condensed water in methane gas, and a backfire prevention mechanism. A safety device for a methane fermentation processing device, characterized by comprising a backfire prevention mechanism to prevent backfire. (2) The safety device for a methane fermentation treatment apparatus according to claim 1, wherein the filter mechanism has a plurality of gravel layers. (3) The safety device for a methane fermentation processing apparatus according to claim 1, wherein the flashback prevention mechanism has a plurality of gravel layers, and the gravel layer also serves as a gravel layer of the filter mechanism. (4) Methane gas generated when high-concentration organic wastewater or surplus activated sludge in the methane fermentation tank is subjected to methane fermentation treatment is supplied to the boiler, or is stored in a gas holder and then supplied to the boiler. This is a safety device for methane fermentation treatment, and the safety device has four partition walls arranged inside the main body of the safety device to divide the interior into five chambers, a first chamber, a second chamber, and a second chamber.
The lower portions of the chamber and the third chamber are communicated, and the lower portions of the fourth chamber and the fifth chamber are communicated, and a perforated plate is provided in the first chamber, the second chamber, and the third chamber above the bottom surface thereof. A gravel layer is formed on the upper surface, the first chamber is connected to the methane fermentation tank, the second chamber is connected to the gas holder, and the third chamber is connected to the boiler, and the fourth and fifth chambers are connected to the liquid chamber. A small hole is provided between the third chamber and the fourth chamber so that condensed water can be stored in the lower portions of the first, second and third chambers, and excess water is drained into the fourth and fourth chambers. A pipe is provided that opens at the static liquid level in the fourth chamber and communicates with the outside. A safety device for a methane fermentation processing apparatus, characterized in that a fifth chamber is provided with a pipe that opens at a water head position whose height from the lower end corresponds to the maximum allowable pressure of the gas holder. (5) The fifth chamber has piping that opens above the lower end of the partition wall between the fourth and fifth chambers and below the opening position of the piping inside the fourth chamber. 5. The safety device for a methane fermentation treatment apparatus according to claim 4, wherein a pipe is connected to the methane fermentation tank. (6) Claim 4, wherein the second chamber is provided with a water supply pipe.
Safety device for the methane fermentation treatment equipment described.