JP5560123B2 - Grass-based biomass digestion promotion method, grass-based biomass digestion tank and digestion system - Google Patents

Description

  The present invention relates to a grass-based biomass digestion promotion method, a grass-based biomass digestion tank, and a digestion system.

  Conventionally, waste containing a large amount of cellulosic substrates such as grass generated by mowing roads or parks (hereinafter referred to as grass biomass) is generally incinerated and used as energy. It was rare. However, it is not possible to effectively use resources to incinerate grass-based biomass, which is wet biomass, without using it as energy. Thus, conventionally, grass-based biomass has been digested and disposed of together with other wet biomass such as food waste, sewage sludge, and livestock excrement by methane fermentation technology.

JP-A-2-268895 Japanese Patent Laid-Open No. 2-289482 JP 2001-114583 A JP 2003-94022 A JP 2006-305467 A Japanese Patent No. 3694744 Japanese Patent No. 4468123

  Here, grass-based biomass requires a much longer time for digestion than other wet biomass. For this reason, the time for soaking in the digestive fluid becomes longer, but if this time becomes longer, the digestion residue and intermediate products of the fungi will stay in the vicinity of the grass-based biomass to be digested. In addition, there arises a problem that the digestion efficiency is lowered due to the digestion residue of the bacteria, intermediate products and the like.

  Then, this invention is made | formed in view of said problem, and provides the grass-type biomass digestion promotion method, grass-type biomass digester, and digestion system which can improve the digestive efficiency of grass-type biomass. Objective.

To achieve the above object, grass biomass digestive process according to the present invention is a grass-based biomass digestion promoting method for promoting digestion by digestive juices grass biomass of grass biomass digestion tank, grass system A drainage step for discharging the digestive juice in the biomass digester, and an inflow step for flowing the digestive fluid in the sewage digester for sewage into the grass-based biomass digester as a new digestive fluid, A washing step of washing grass biomass by moving the digestion fluid by generating a flow of digestion fluid in the grass biomass digestion tank by discharging the digestion fluid in the biomass digestion tank and flowing in new digestion fluid only including, a washing step, and wherein the starting gas pressure of the grass biomass digestion tank or the flow rate of the gas discharged from the grass biomass digestion tank as an indicator.

Further, the grass-based biomass digester according to the present invention is a grass-based biomass digester for digesting grass-based biomass with a digestive liquid, a pressure sensor for measuring the pressure of gas in the grass-based biomass digester, grass The digester in the sewage digester for sewage provided separately from the discharge pipe that discharges the digestive juice in the biomass biomass digester and the grass biomass digester enters the grass biomass digester as a new nitrification solution having an inflow pipe which comprises a cleaning means for cleaning the grass biomass, characterized by being configured to initiate cleaning of grass biomass by cleaning means the pressure of the gas to be measured by the pressure sensor as an indicator And The grass-based biomass digester according to the present invention is a grass-based biomass digester for digesting grass-based biomass with digestive fluid, and is a flow rate sensor that measures the flow rate of gas discharged from the grass-based biomass digester. , A drainage pipe that discharges the digestive fluid in the grass-based biomass digester, and a digester in the sewage sewage digester provided separately from the grass-based biomass digester, as a new nitrification solution A cleaning means for cleaning grass-based biomass having an inflow pipe for flowing in, and configured to start cleaning the grass-based biomass by the cleaning means using the gas flow rate measured by the flow sensor as an index. It is characterized by.

Moreover, digestion system according to the present invention is a digestive system including a sewage digester grass system biomass digestion tank for sewage, a pressure sensor for measuring the pressure of the gas grass biomass digestion tank, It has a discharge pipe that discharges the digestive liquid in the grass-based biomass nitrification tank, and an inflow pipe that allows the digestive liquid in the sewage digester to flow into the grass- based biomass digestion tank. Cleaning means for cleaning with digestive liquid in the sewage digester, and configured to start cleaning of grass-based biomass by the cleaning means using the gas pressure measured by the pressure sensor as an index. Features. The digestion system according to the present invention is a digestion system including a sewage digester for sewage and a grass biomass digester, and a flow sensor for measuring the flow rate of gas discharged from the grass biomass digester. An exhaust pipe that discharges the digestive juice in the grass-based biomass digester, and an inflow pipe that flows the digested fluid in the sewage digester into the grass-based biomass digester, And a cleaning means for cleaning the biomass using the digestion liquid in the sewage digester, and configured to start the cleaning of the grass-based biomass by the cleaning means using the gas flow rate measured by the flow sensor as an index. It is characterized by that.

  According to the present invention, it becomes possible to wash away digestion residues and intermediate products of bacteria that have accumulated in the vicinity of wet biomass such as grass, so that the grass system that can improve the digestion efficiency of grass biomass It becomes possible to realize a biomass digestion promotion method, a grass-based biomass digestion tank, and a digestion system.

FIG. 1 is a schematic diagram showing a schematic configuration of a digestion system according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing an example of a digestion system according to the present embodiment. FIG. 3 is a flowchart showing an outline of a method for digesting grass-based biomass according to the present embodiment. FIG. 4 is a flowchart showing an outline of the cleaning process shown in FIG. FIG. 5 is a schematic diagram showing a schematic configuration of a digestion system according to Embodiment 2 of the present invention. FIG. 6 is a flowchart showing an outline of the cleaning process according to the second embodiment. FIG. 7 is a schematic diagram showing a schematic configuration of a digestion system according to Embodiment 3 of the present invention. FIG. 8 is a flowchart showing an outline of the cleaning process according to the third embodiment. FIG. 9 is a schematic diagram showing a schematic configuration of a digestion system according to Embodiment 4 of the present invention. FIG. 10 is a schematic diagram showing a schematic configuration of a digestion system according to Embodiment 5 of the present invention. FIG. 11 is a flowchart showing an outline of the cleaning process according to the fifth embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following description, each drawing only schematically shows the shape, size, and positional relationship to the extent that the contents of the present invention can be understood. Therefore, the present invention is illustrated in each drawing. It is not limited to only the shape, size, and positional relationship. Moreover, in each figure, a part of hatching in a cross section is abbreviate | omitted for clarification of a structure. Furthermore, the numerical values exemplified below are merely preferred examples of the present invention, and therefore the present invention is not limited to the illustrated numerical values.

(Embodiment 1)
Hereinafter, a digestion system, a grassy biomass digestion promoting method, a grassy biomass digestion tank, and a digestion system according to Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of a digestion system according to the first embodiment. As shown in FIG. 1, the digestion system 1 includes an existing sewage digester 100 and a plant digester 10 disposed adjacent to the sewage digester 100.

  Grass-based biomass G10 such as grass that has been transported by a transport vehicle 110 such as a dump truck or a garbage truck is input to the inside from an input port 11a provided above the plant digestion tank 10. The plant digestion tank 10 uses the water level difference D1 (= H100−H10) between the digestion solution W100 in the sewage digestion tank 100 and the digestion solution W10 in the plant digestion tank 10 for the digestion solution W100 in the sewage digestion tank 100. The digestive fluid W100 in the sewage digester 100 is caused to flow into the vegetation digester 10 using the upper inflow pipe 12 that flows into the digester 10 and the water level difference D1 between the digested fluid W100 and the digested fluid W10. A lower inflow pipe 14 is connected to a side discharge pipe 15 that wastes the digestive juice W10 in order to adjust the liquid level in the plant digestion tank 10. In addition, an outlet 11b for removing the residue G11 that could not be digested is provided at the bottom of the plant digestion tank 10. In this description, the digestive fluids W100 and W10 may each contain sludge.

  Here, the outlet of the upper inlet pipe 12 is located above the plant digestion tank 10. A shower head is provided at the outlet, and the digestive juice W100 is discharged in a shower shape. By releasing the digestive juice W100 from above into a shower shape, the surface of the grassy biomass G10 in the plant digestion tank 10 can be uniformly moistened with the digestive fluid W100. As a result, the fungus is activated to digest the grassy biomass. Can be promoted.

  The outlet of the lower inflow pipe 14 is located below the plant digestion tank 10. By flowing in the digestive juice W100 in the sewage digester 100 from below in the plant digester 10, the grass-based biomass G10 in the plant digester 100 is washed using the flow of the digested solution W100 and the like by this inflow. As a result, it becomes possible to activate the fungus and promote the digestion of grass-based biomass. However, it is also possible to use or use the release of the digestive fluid W100 from the upper inflow pipe 12 for washing the grassy biomass G10 in the vegetation digestion tank 10.

  The side discharge pipe 15 is branched into a plurality of branch pipes 15 </ b> A to 15 </ b> N on the upstream side (the plant digestion tank 10 side). The inflow ports of the branch pipes 15 </ b> A to 15 </ b> N are connected to different height positions on the side wall of the plant digestion tank 10. Thereby, it becomes possible to adjust easily the liquid level height of the digestive liquid W10 in the plant digestion tank 10 to the height where each branch pipe 15A-15N was connected. Moreover, it becomes easy to selectively discharge the supernatant portion of the digestive juice W10. In addition, the side part discharge pipe 15 after joining merges with the lower discharge pipe 13, for example.

  The inlet of the lower discharge pipe 13 is located near the bottom in the vegetation digestion tank 10 and discharges the digestive juice W10 near the bottom in the vegetation digestion tank 10. In addition, even if the digestive juice W10 discharged | emitted via the lower discharge pipe 13 (a part including the side part discharge pipe 15) returns to the sewage digestion tank 100, for example, it passes through a transport vehicle, a feed pipe, etc. May be sent to a sludge treatment facility such as a dehydrator (not shown). When returning the digested liquid W10 discharged to the lower discharge pipe 13 to the sewage digester tank 100, waste liquid or the like is not substantially generated from the plant digester tank 10, so that the grass-based biomass can be effectively used more efficiently. Here, the side discharge pipe 15 and the lower discharge pipe 13 after joining may be provided with a configuration such as a pump for promoting the discharge of the digestive fluid W10.

  In addition, each of the branch pipes 15A to 15N of the upper inlet pipe 12, the lower inlet pipe 14, the side outlet pipe 15 and the lower outlet pipe 13 is provided with valves 12a, 14a, 15a to 15n that are manually opened or closed. , And 13a are provided, and the respective flow paths are opened and closed as necessary.

Further, above the vegetation digester 10, an air pipe 16 for introducing / discharging air against grass wood digestion tank 10, the gas exhaust pipe for exhausting the gases such as methane that occurred vegetation digestion tank 10 17 And are connected. The air pipe 16 and the gas exhaust pipe 17 are respectively provided with valves 16a and 17a that are manually or automatically opened and closed, and the respective flow paths are opened and closed as necessary.

  The air exhaust pipe 16 is used to extract air from the sewage digester 10 when the digestive fluid W100 is allowed to flow from the sewage digester 100 into the sealed vegetation digester 10 by closing the inlet 11a and the outlet 11b. It is piping. The air exhaust pipe 16 is also a pipe for introducing air into the plant digestion tank 10 when the digestive fluid W10 is discharged from the plant digestion tank 10.

  The gas exhaust pipe 17 is a pipe for discharging the gas in the plant digestion tank 10 after completion of the digestion process or digestion process. In addition, the gas exhaust pipe 17 joins the gas exhaust pipe 120 connected to the sewage digester 100, for example. The gas exhaust pipe 120 is provided with a valve 120a that opens and closes manually or automatically, and the flow path is opened and closed as necessary. The gas exhausted from the sewage digester 100 or the plant digester 10 is, for example, via a gas exhaust pipe 120 (partly including the gas exhaust pipe 17), for example, a gas purification apparatus (for example, the gas purification apparatus 200 shown in FIG. 2). The gas is purified to biogas and stored in a gas tank (for example, see gas tank 210 shown in FIG. 2).

  In the first embodiment, for example, as shown in FIG. 2, a plurality of plant digesters 10-1 to 10-n may be installed adjacent to one sewage digester 100. FIG. 2 is a schematic diagram illustrating an example of a digestion system according to the first embodiment. In this case, as shown in FIG. 2, the gas exhaust pipes 17-1 to 17-n of the vegetation digesters 10-1 to 10-n are joined together to the gas exhaust pipe 120 of the sewage digester 100. Also good.

  Subsequently, the method for digesting grass biomass according to the first embodiment will be described in detail with reference to the drawings. FIG. 3 is a flowchart showing an outline of the grass-based biomass digestion method according to the first embodiment. As shown in FIG. 3, in this digestion method, first, the inlet 11a of the plant digestion tank 10 is opened, and grass-based biomass G10 such as grass that has been transported by the transport vehicle 110 or the like from this slot 11a is removed. 10 (step S101). Subsequently, it is determined whether or not the grass-based biomass G10 has reached a predetermined amount set in advance as a guide (step S102). If the predetermined amount has not been reached (No in step S102), the next grass-based biomass is determined. Wait for G10 input. On the other hand, if it is equal to or greater than the predetermined amount (Yes in Step S102), first, the inlet 11a of the plant digestion tank 10 is closed (Step S103), and then the valve 16a of the air pipe 16 is opened (Step S104). Subsequently, by opening the valve 14a of the lower inflow pipe 14 (step S105), the digestive fluid W100 in the sewage digester 100 is introduced into the plant digester 10 while the air in the plant digester 10 is being evacuated. At this time, the upper inflow pipe 12 may be used in combination. Note that the predetermined amount may be, for example, a weight or a bag. Further, a predetermined collection period or the like may be used instead of the predetermined amount.

  Thereafter, it is determined whether or not the liquid level of the digestive liquid W10 in the plant digestion tank 10 has reached a predetermined height (step S106), and waiting for it to reach (No in step S106). Thereafter, when the predetermined height is reached (Yes in step S106), the valves 14a and 16a of the lower inflow pipe 14 and the air pipe 16 are closed (step S107). In addition, the method of arrange | positioning a liquid level sensor etc. in the predetermined | prescribed height in the vegetation digestion tank 10 detects whether the liquid level of the digestive liquid W10 in the vegetation digestion tank 10 reached | attained the predetermined height, for example. Various modifications such as a method based on whether a predetermined time has passed or not can be made.

  Next, while waiting for a predetermined number of days (here, 60 days) from the introduction of the digestive fluid W100, the valve 12a of the upper inflow pipe 12 is opened at a predetermined interval (for example, every day) for a predetermined time (for example, 1 hour) ( In step S108), the upper layer of the grassy biomass G10 is prevented from being dried in the plant digestion tank 10 by taking a shower of the digestive fluid W100 in the plant digestion tank 10.

  In addition, as a treatment for improving the digestion efficiency of the grass-based biomass G10 once or twice or more after the predetermined number of days (60 days) from the introduction of the digestive liquid W100, the grass in the plant digestion tank 10 is used. A cleaning process for cleaning the system biomass G10 is executed (No in Step S109 and Step S110). This cleaning process may be performed, for example, every predetermined number of days (for example, 14 days or 30 days). Details of the cleaning process will be described later. It should be noted that until the predetermined number of days (60 days) has passed since the introduction of the digestive juice W100, for example, even after the cleaning process is performed once, the process of step S108 may be continued.

  Next, when the remaining days of the predetermined number of days (60 days) have elapsed (Yes in step S110), the valves 17a and 14a of the gas exhaust pipe 17 and the lower inflow pipe 14 are opened (step S111), whereby grass-based biomass. A gas such as methane generated in the plant digestion tank 10 by digestion of G10 is sent out to the gas exhaust pipe 17 with the pressure of the digestive liquid W100 flowing from the sewage digestion tank 100. The gas sent out to the gas exhaust pipe 17 is then sent to, for example, the gas purification device 200 (see FIG. 2) and purified, and then stored in the gas tank 210 (see FIG. 2).

  Then, it waits until the exhaust of the gas in the plant digestion tank 10 is completed (No in Step S112), and when completed (Yes in Step S112), the valves 17a and 14a of the gas exhaust pipe 17 and the lower inflow pipe 14 are closed ( Then, the digestion liquid W10 in the plant digestion tank 10 is discharged by opening the valves 16a and 13a of the air pipe 16 and the lower discharge pipe 13 (step S114). In addition, the digestive liquid W10 discharged | emitted from the plant digestion tank 10 may be returned to the sewage digestion tank 100, for example, and may be sent to sludge treatment facilities, such as a dehydrator.

  Thereafter, when the discharge of the digestive juice W10 is completed (Yes in step S115), the valves 16a and 13a of the air pipe 16 and the lower discharge pipe 13 are closed (step S116), and the operation is ended.

  With the configuration and operation as described above, in the first embodiment, the digestive juice W100 in the sewage digester 100 is used by using a plant digester 10 different from the sewage digester 100 for sewage digestion. It is possible to digest the grass-based biomass G10. Accordingly, a grass-based biomass digester, a digestion system, and a grass-based biomass digestion method capable of effectively utilizing grass-based biomass using existing facilities without excessively increasing the burden on the sewage digester 100 Can be realized.

  Next, the cleaning process shown in step S109 of FIG. 3 will be described in detail with reference to the drawings. FIG. 4 is a flowchart showing an outline of the cleaning process shown in FIG. As shown in FIG. 4, in the cleaning process, it is determined whether or not a predetermined number of days (for example, 14 days) has elapsed since the introduction of the digestive fluid W100 or the previous cleaning process (step S120). If it has not elapsed (No in step S120), the process returns to the operation shown in FIG. On the other hand, when the predetermined number of days have passed (Yes in step S120), first, the valve 16a of the air pipe 16 is opened and the valve 13a of the lower discharge pipe 13 is opened (step S121), so that the digestion in the plant digestion tank 10 is performed. The liquid W10 is discharged. As a result, digestion residues and intermediate products of bacteria remaining in the vicinity of the grass biomass G10 in the plant digestion tank 10 and the like, which inhibit digestion of the grass biomass G10 (hereinafter simply referred to as fungal digestion residues and intermediate products) Etc.) is washed away by the flow of the digestive fluid W10. At this time, the digestive juice W10 may be discharged by using the side discharge pipe 15 together. In this case, as a procedure for opening the valves 15a to 15n of the plurality of branch pipes 15A to 15N branched from the side discharge pipe 15, for example, the valve 15a of the uppermost branch pipe 15A is opened, and then in the plant digestion tank 10 When the liquid level drops to the position of the inlet of the discharge pipe where the valve is opened, a procedure of opening the valve of the next discharge pipe to the lowest branch pipe 15N can be adopted.

  Thereafter, when the liquid level in the vegetation digestion tank 10 is lowered to a predetermined height (for example, a height at which half or more of the grass-based biomass G10 is exposed from the digestive liquid W10) (Yes in step S122), then the air The valves 16a and 13a of the pipe 16 and the side discharge pipe 13 are closed (step S123), and then the valves 17a and 12a of the gas exhaust pipe 17 and the upper inflow pipe 12 are opened (step S124), thereby the sewage digester 100. The digestive liquid W100 is showered from above in the plant digestion tank 10. As a result, the fungus discharge remaining on the surface of the grass-based biomass G10 is washed away by the shower effect, and the plant digestion tank 10 is filled with the digestive fluid W100 in the sewage digestion tank 100, so that the grass-based biomass G10 is obtained. New bacteria adhere. As a result, the digestion efficiency of the grass-based biomass G10 is improved and digestion is promoted. However, at this time, the lower inflow pipe 14 may be used together, or the lower inflow pipe 14 may be used instead of the upper inflow pipe 12. Even in this case, since it is possible to generate the flow of the digestive juice W10 in the plant digestion tank 10, it is possible to wash away the digestion residue and intermediate products of bacteria remaining in the vicinity of the grass-based biomass G10, The plant digestion tank 10 is filled with the digestive liquid W100 in the sewage digestion tank 100, and new bacteria adhere to the grassy biomass G10.

  Thereafter, it is determined whether or not the liquid level in the plant digestion tank 10 has reached a predetermined height for operation (step S125), and if it has reached (Yes in step S125), the gas exhaust pipe 17 and the upper inflow pipe 12 are reached. The valves 17a and 12a are closed (step S126), and then the operation returns to the operation shown in FIG.

  By operating in this way, in the first embodiment, the digestion residue, intermediate products, and the like of the bacteria staying in the vicinity of the grass-based biomass G10 in the grass-based biomass digester 10 for the grass-based biomass are stored in the sewage digester 100. Therefore, it is possible to promote digestion by improving the digestion efficiency of the grass-based biomass G10. For this reason, compared with the case where grass-based biomass is digested in the sewage digester 100, the grass-based biomass is effectively utilized using existing facilities without excessively increasing the burden on the sewage digester 100. Is possible. Further, in the grass-based biomass cleaning method according to the first embodiment, it is not necessary to physically move grass-based biomass such as grass. For example, by moving grass-based biomass and stirring the digestion liquid, Compared with the method of removing digestion residues, intermediate products, etc. of bacteria staying in the vicinity, it becomes possible to promote digestion by washing grass biomass easily and simply.

  In addition, when digesting and disposing of grass-based biomass in addition to wet biomass such as food waste, sewage sludge, and livestock excrement that should be treated in the past, the load on one sewage digester is increased. However, according to the present embodiment 1, since the digester for plants and plants is used separately from the sewage digester, It is possible to efficiently digest grass-based biomass without excessively increasing the load on the sewage digester.

  Furthermore, grass biomass produced by mowing roads and parks is not stable throughout the year. Therefore, the digester that digests grass-based biomass exclusively will be a facility with a stop depending on the season. Introducing such a facility with a start and stop requires a great burden on the processing facility in terms of introduction cost, facility area, and the like. On the other hand, in this Embodiment 1, since it becomes possible to digest vegetation biomass using the existing sewage digester, it can avoid that a processing facility requires a big burden.

(Embodiment 2)
Next, a grassy biomass digestion promotion method, a grassy biomass digestion tank and a digestion system according to a second embodiment of the present invention will be described in detail with reference to the drawings. However, in the following description, the same configurations and operations as those of the first embodiment described above are denoted by the same reference numerals, and redundant description thereof is omitted.

  FIG. 5 is a schematic diagram illustrating a schematic configuration of the digestion system according to the second embodiment. As is clear from comparison between FIG. 1 and FIG. 5, the digestion system 2 according to the second embodiment measures the gas pressure in the plant digestion tank 10 in addition to the same configuration as the digestion system 1 shown in FIG. A pressure sensor 21 is provided. Other configurations are the same as those of the digestion system 1.

  In the second embodiment, the cleaning process shown in step S109 of FIG. 3 in the first embodiment is executed based on, for example, the gas pressure in the plant digestion tank 10 detected by the pressure sensor 21. That is, in the second embodiment, when the gas pressure in the vegetation digestion tank 10 is increased to some extent or the change in the gas pressure in the vegetation digestion tank 10 is reduced, the grass biomass G10 in the vegetation digestion tank 10 is washed. By doing this, the digestion residue of the bacteria, intermediate products, etc. staying in the vicinity of the grass-based biomass G10 are washed away.

  Here, the cleaning process according to the second embodiment will be described in detail with reference to the drawings. FIG. 6 is a flowchart showing an outline of the cleaning process according to the second embodiment. The grass-based biomass digestion method according to the second embodiment is the same as that of the first embodiment, except that the cleaning process shown in step S109 of FIG. 3 is replaced with the cleaning process shown in FIG.

As shown in FIG. 6, in the cleaning process according to the second embodiment, first, the gas pressure in the vegetation digestion tank 10 is measured using the pressure sensor 21 provided in the vegetation digestion tank 10 (step S220). It is determined whether or not the measured gas pressure is equal to or higher than a predetermined pressure set in advance (step S221). As a result of this determination, when the gas pressure in the plant digestion tank 10 is not equal to or higher than the predetermined pressure (No in step S221), the process returns to the operation shown in FIG. On the other hand, when the pressure is equal to or higher than the predetermined pressure (Yes in step S221), the grass biomass in the plant digestion tank 10 for grass biomass is executed by performing the operations after step S121 in FIG. 4 described in the first embodiment. G10 is washed (steps S121 to S126).

  By configuring and operating as described above, in the second embodiment, as in the first embodiment, the sewage digester tank 10 different from the sewage digester tank 100 for sewage digestion is used, and the inside of the sewage digester tank 100 is used. It becomes possible to digest grass-type biomass G10 using the digestive liquid W100. Accordingly, a grass-based biomass digestion promoting method, a grass-based biomass digestion tank, and a digestion system capable of effectively utilizing grass-based biomass using existing facilities without excessively increasing the burden on the sewage digester 100 Can be realized.

  In the second embodiment, the digestion residue and intermediate products of the bacteria staying in the vicinity of the grass-based biomass G10 can be washed away using the digestive liquid W100 in the sewage digestion tank 100. It becomes possible to improve the digestion efficiency of the biomass G10 and promote digestion. For this reason, compared with the case where grass-based biomass is digested in the sewage digester 100, the grass-based biomass is effectively utilized using existing facilities without excessively increasing the burden on the sewage digester 100. Is possible. Further, in the grass-based biomass cleaning method according to the second embodiment, it is not necessary to physically move grass-based biomass such as grass. For example, by moving grass-based biomass and stirring the digestion liquid, Compared with the method of removing digestion residues, intermediate products, etc. of bacteria staying in the vicinity, it becomes possible to promote digestion by washing grass biomass easily and simply.

  Since other configurations and operations are the same as those in the first embodiment, detailed description thereof is omitted here.

(Embodiment 3)
Next, a grassy biomass digestion promotion method, a grassy biomass digestion tank, and a digestion system according to Embodiment 3 of the present invention will be described in detail with reference to the drawings. However, in the following description, the same reference numerals are given to the same configurations and operations as those in the above-described first or second embodiment, and the redundant description thereof is omitted.

  FIG. 7 is a schematic diagram illustrating a schematic configuration of the digestion system according to the third embodiment. As is clear from comparison between FIG. 1 and FIG. 7, the digestion system 3 according to the third embodiment has the same configuration as the digestion system 1 shown in FIG. 1, and the valve 17 a that opens and closes the gas exhaust pipe 17 is omitted. In addition, a flow rate sensor 27 for measuring the flow rate of the gas flowing through the gas exhaust pipe 17 is provided. Other configurations are the same as those of the digestion system 1.

In the third embodiment, the gas generated in the plant digestion tank 10 is always sent to, for example, a gas purifier (see FIG. 2). At this time, how the plant digester 10, Do gas is generated, it is measured by the flow sensor 2 7 provided in the gas exhaust pipe 17. Therefore, in the present third embodiment, the cleaning process shown in step S109 in FIG. 3 in the first embodiment is executed based on the gas flow rate detected by the flow rate sensor 27, for example. That is, in Embodiment 3, when the amount of gas generated in the vegetation digestion tank 10 is reduced to some extent, the grass based biomass G10 in the vegetation digestion tank 10 is washed to stay in the vicinity of the grass based biomass G10. Wash away the digestion residue and intermediate products.

  Here, the cleaning process according to the third embodiment will be described in detail with reference to the drawings. FIG. 8 is a flowchart showing an outline of the cleaning process according to the third embodiment. The grass-based biomass digestion method according to the third embodiment is the same as that of the first embodiment described above, except that the cleaning process shown in step S109 in FIG. 3 is replaced with the cleaning process shown in FIG.

As shown in FIG. 8, in the cleaning process of the third embodiment, first, with a flow rate sensor 27 provided in the gas exhaust pipe 17, to measure the gas flow quantity occurring in plants digestion tank 10 (Step S320), it is determined whether or not the measured gas flow rate is equal to or higher than a predetermined flow rate (Step S321). As a result of this determination, if the gas flow rate is equal to or higher than the predetermined flow rate (Yes in step S321), the process returns to the operation shown in FIG. On the other hand, if not a predetermined flow rate or more (No in step S321), and executes the step S121 and subsequent operation of FIG. 4 described in the first embodiment, grass biomass G10 in plants digester 10 for grass biomass Is washed (steps S121 to S126). However, since the valve 17a for opening and closing the gas exhaust pipe 17 is omitted in the third embodiment, step S124 shown in FIG. 4 is replaced with step S324 in which the valve 12a of the upper inflow pipe 12 is opened. 4 is replaced with step S326 in which the valve 12a of the upper inflow pipe 12 is closed.

  By configuring and operating as described above, in the third embodiment, as in the first and second embodiments, a sewage digester is used using a plant digester 10 that is different from the sewage digester 100 for sewage digestion. It becomes possible to digest grass-type biomass G10 using the digestive liquid W100 in 100. FIG. Accordingly, a grass-based biomass digestion promoting method, a grass-based biomass digestion tank, and a digestion system capable of effectively utilizing grass-based biomass using existing facilities without excessively increasing the burden on the sewage digester 100 Can be realized.

  Also in the present third embodiment, the digestive juice W100 in the sewage digester 100 is used to remove the digestion residue, intermediate products, etc. of the bacteria staying in the vicinity of the grass biomass G10 in the plant digester 10 for the grass biomass. Since it can be used and washed away, digestion can be promoted by improving the digestion efficiency of the grass biomass G10. For this reason, compared with the case where grass-based biomass is digested in the sewage digester 100, the grass-based biomass is effectively utilized using existing facilities without excessively increasing the burden on the sewage digester 100. Is possible. Further, in the grass-based biomass cleaning method according to the third embodiment, since there is no need to physically move grass-based biomass such as grass, for example, grass-based biomass is stirred by moving the grass-based biomass and stirring the digestion liquid. Compared with the method of removing digestion residues, intermediate products, etc. of bacteria staying in the vicinity, it becomes possible to promote digestion by washing grass biomass easily and simply.

  Since other configurations and operations are the same as those in the first or second embodiment, detailed description thereof is omitted here.

(Embodiment 4)
Next, a grassy biomass digestion promotion method, a grassy biomass digestion tank, and a digestion system according to Embodiment 4 of the present invention will be described in detail with reference to the drawings. However, in the following description, the same reference numerals are given to the same configurations and operations as those in any of the first to third embodiments described above, and the overlapping description is omitted.

  FIG. 9 is a schematic diagram illustrating a schematic configuration of the digestion system according to the fourth embodiment. As is clear when FIG. 1 is compared with FIG. 9, the digestion system 4 according to the fourth embodiment has a configuration similar to the plant digestion tank 10 in the digestion system 1 shown in FIG. 1 and 10-2 are provided in two stages. Other configurations are the same as those of the digestion system 1.

  In the example shown in FIG. 9, the digestive fluid W100 is sent from the sewage digester 100 into the upper plant digester 10-1 via the lower inflow pipe 14-1. Moreover, the digestive liquid W100 in the sewage digester 100 is showered in the plant digester 10-1 through the upper inflow pipe 12-1. The air in the plant digestion tank 10-1 is appropriately exhausted through an air pipe 16-1 that merges with an air pipe 16-2 described later, and the gas in the plant digestion tank 10-1 is appropriately gas. Exhaust gas is exhausted through a gas exhaust pipe 17-1 that joins the exhaust pipe 120.

  Moreover, the digestive liquid W10 in the plant digestion tank 10-1 is suitably discharged | emitted via the lower discharge pipe 13-1. The discharged digestion liquid W10 is introduced into the lower plant digestion tank 10-2. In addition, the supernatant of the digestive juice W10 in the plant digestion tank 10-1 is appropriately placed in the lower plant digestion tank 10-2 via any one of the branch pipes 15A-1 to 15N-1 and the side discharge pipe 15-1. Showered inside. The air in the plant digestion tank 10-2 is appropriately exhausted through an air pipe 16-2, which will be described later, and the gas in the plant digestion tank 10-2 is appropriately supplied via a gas pipe 17-2. Exhaust gas is exhausted through a gas exhaust pipe 17-1 that joins the exhaust pipe 120.

  In addition, the digestive liquid W10 in the plant digestion tank 10-2 is suitably discharged | emitted via the lower discharge pipe 13-2. Further, the supernatant of the digestive juice W10 in the plant digestion tank 10-2 is appropriately sent to the lower discharge pipe 13-2 via one of the branch pipes 15A-2 to 15N-2 and the side discharge pipe 15-2. It is done. For example, the digestive juice W10 that has flowed into the lower discharge pipe 13-2 is sent to a lower vegetation digester tank (not shown) or returned to the sewage digester tank 100, via a transport vehicle, a feed pipe, or the like. May be sent to a sludge treatment facility such as a dehydrator (not shown).

  Thus, in this Embodiment 4, the digestive liquid W10 of the vegetation digestion tank 10-1 located in an upper stage is cooperated with the vegetation digestion tanks 10-1 and 10-2 arranged in a plurality of stages. On the other hand, it can be effectively utilized in the plant digestion tank 10-2 located in the lower stage. As a result, a grass-based biomass digestion promotion method, grass-based biomass digestion tank, and digestion system that can effectively utilize grass-based biomass using existing facilities while reducing the burden on the sewage digester 100 are realized. It becomes possible to do.

  Since other configurations and operations are the same as those in any of the first to third embodiments, detailed description thereof is omitted here.

(Embodiment 5)
Next, a grassy biomass digestion promotion method, a grassy biomass digestion tank, and a digestion system according to Embodiment 5 of the present invention will be described in detail with reference to the drawings. However, in the following description, configurations and operations similar to those in any of Embodiments 1 to 4 described above are denoted by the same reference numerals, and redundant description thereof is omitted.

  In the above description, the case where the discharge of the digestive liquid W10 in the plant digestion tank 10 and the inflow of the digestive liquid W100 in the sewage digestion tank 100 are repeated one or more times when washing the grassy biomass G10 is taken as an example. . However, the washing method of grass biomass can be variously modified. One example thereof will be described in detail below as Embodiment 5 with reference to the drawings. In the following description, the fifth embodiment will be described with reference to the above-described first embodiment, but the present invention is not limited to this and can be applied to any of the above-described embodiments.

  FIG. 10 is a schematic diagram showing a schematic configuration of a digestion system according to Embodiment 5 of the present invention. As is clear from a comparison between FIG. 1 and FIG. 10, the digestion system 5 according to the fifth embodiment includes an air pump 50 that sends out air in addition to the same configuration as the digestion system 1 shown in FIG. And an air introduction pipe 51 that discharges (bubbles) the air as bubbles B from below in the plant digestion tank 10. The air introduction pipe 51 is provided with a valve 51a that is manually or automatically opened and closed, and the flow path is opened and closed as necessary. In the fifth embodiment, the air from the air pump 50 is released as bubbles B from one or more lower positions in the vegetation digestion tank 10, thereby causing the digestion liquid W10 to flow in the vegetation digestion tank 10, Thereby, the grassy biomass G10 in the plant digestion tank 10 is washed.

  Here, the cleaning process according to the fifth embodiment will be described in detail with reference to the drawings. FIG. 11 is a flowchart showing an outline of the cleaning process according to the fifth embodiment. The grass-based biomass digestion method according to the fifth embodiment is the same as that of the first embodiment, except that the cleaning process shown in step S109 in FIG. 3 is replaced with the cleaning process shown in FIG.

  As shown in FIG. 11, in the cleaning process according to the fifth embodiment, whether or not a predetermined number of days (for example, 14 days) has elapsed since the introduction of the digestive fluid W100 or the previous cleaning process is performed. If it is determined (step S120) and it has not elapsed (No in step S120), the process returns to the operation shown in FIG. On the other hand, when the predetermined number of days have elapsed (Yes in step S120), first, the valve 17a of the gas exhaust pipe 17 is opened (step S521), and then the valve 51a of the air introduction pipe 51 is opened and the air pump 50 is started. (Step S522) Thus, the plant digestion tank 10 is bubbled from below. Thereby, the flow of the digestive liquid W10 generate | occur | produces in the vegetation digestion tank 10, and, thereby, the digestion residue, intermediate product, etc. of the microbe staying in the vicinity of grass-type biomass G10 are washed away. At this time, the gas in the plant digestion tank 10 and the fed air are exhausted through, for example, the gas exhaust pipe 17.

  After that, it waits for a predetermined time to elapse from the start of bubbling (No in step S523). When the predetermined time elapses (Yes in step S523), the valves 17a and 51a of the gas exhaust pipe 17 and the air introduction pipe 51 are closed, The air pump 50 is stopped (step S524), and then the process returns to the operation shown in FIG.

  By configuring and operating as described above, in the fifth embodiment, as in any of the first to fourth embodiments, sewage is obtained using a plant digester 10 that is different from the sewage digester 100 for sewage digestion. It is possible to digest grass-based biomass while using the digestive fluid W100 in the digestion tank 100. Accordingly, a grass-based biomass digestion promoting method, a grass-based biomass digestion tank, and a digestion system capable of effectively utilizing grass-based biomass using existing facilities without excessively increasing the burden on the sewage digester 100 Can be realized.

  Further, also in the fifth embodiment, it is possible to wash away the digestion residue, intermediate products, etc. of the bacteria staying in the vicinity of the grass-based biomass G10 by causing the digestion liquid W10 to flow in the plant digestion tank 10 by bubbling. Therefore, it becomes possible to improve digestion efficiency of grass-type biomass G10 and to promote digestion. For this reason, compared with the case where grass-based biomass is digested in the sewage digester 100, the grass-based biomass is effectively utilized using existing facilities without excessively increasing the burden on the sewage digester 100. Is possible. Further, in the grass-based biomass cleaning method according to the second embodiment, it is not necessary to physically move grass-based biomass such as grass. For example, by moving grass-based biomass and stirring the digestion liquid, Compared with the method of removing digestion residues, intermediate products, etc. of bacteria staying in the vicinity, it becomes possible to promote digestion by washing grass biomass easily and simply.

  Other configurations and operations are the same as those in any of Embodiments 1 to 4 described above, and detailed description thereof is omitted here.

  In addition, the above-described embodiment and its modifications are merely examples for carrying out the present invention, and the present invention is not limited to these, and various modifications according to specifications and the like are within the scope of the present invention. Furthermore, it is obvious from the above description that various other embodiments are possible within the scope of the present invention. For example, it is needless to say that the modification examples illustrated as appropriate for each embodiment can be applied to other embodiments.

1, 2, 3, 4, 5 Digestion system 10, 10-1 to 10-n Plant digestion tank 11a Input port 11b Outlet port 12, 12-1, 12-2 Upper inlet pipe 13, 13-1, 13-2 Lower discharge pipe 14, 14-1 Lower inflow pipe 15, 15-1, 15-2 Side discharge pipe 15A-15N, 15A-1-15N-1, 15A-2-15N-2 Branch pipe 12a, 13a, 14a , 15a to 15n, 16a, 17a, 120a Valve 16, 16-1, 16-2 Air piping 17, 17-1 to 17-n Gas exhaust pipe 21 Pressure sensor 27 Flow sensor 50 Air pump 51 Air introduction pipe 51a Valve 100 Sewage Digestion tank 110 Transport vehicle 120 Gas exhaust pipe 200 Gas purification device 210 Gas tank B Bubble D1 Water level difference G10 Grass biomass G11 Residue W10, W100 Digestion

Claims (7)

A grass- based biomass digestion promoting method that promotes digestion of grass-based biomass by digestive fluid in a grass-based biomass digestion tank for grass-based biomass ,
A discharge step for discharging the digested liquid in the grass-based biomass digester, and an inflow step for flowing the digested liquid in the sewage digester for sewage into the grass-based biomass digester as a new digested liquid. in, by entering the new digestion liquid is discharged digestive juices of the grass biomass digestion tank, by moving the digested liquid by generating a flow of digestive juices in the grass biomass digestion tank look including a cleaning step for cleaning the grass biomass,
The method for promoting digestion of grass-based biomass, characterized in that the washing step is started with the pressure of gas in the grass-based biomass digestion tank or the flow rate of gas discharged from the grass-based biomass digestion tank as an index . The washing step, wherein wherein said by generating a flow of digestive juices in the grass biomass digestion tank by releasing air bubbles from below the grass biomass digestion tank for cleaning the grass biomass Item 2. The method for promoting digestion of grassy biomass according to Item 1. A grass-based biomass digester for digesting grass-based biomass with digestive fluid,
A pressure sensor for measuring the pressure of the gas in the grass biomass digester;
An exhaust pipe for discharging the digestive liquid in the grass-based biomass digester, and the grass-based biomass using a digestive liquid in a sewage sewage digester provided separately from the grass-based biomass digester as a new nitrification solution Having an inflow pipe for flowing into the digestion tank, comprising a cleaning means for cleaning the grass-based biomass ;
A grass-based biomass digester configured to start cleaning of the grass-based biomass by the cleaning means using the pressure of the gas measured by the pressure sensor as an index . A grass-based biomass digester for digesting grass-based biomass with digestive fluid,
A flow rate sensor for measuring a flow rate of gas discharged from the grass biomass digester,
An exhaust pipe for discharging the digestive liquid in the grass-based biomass digester, and the grass-based biomass using a digestive liquid in a sewage sewage digester provided separately from the grass-based biomass digester as a new nitrification solution Having an inflow pipe for flowing into the digestion tank, and comprising a cleaning means for cleaning the grass-based biomass,
The cleaning unit starts cleaning the grassy biomass using the gas flow rate measured by the flow sensor as an index.
A grass-based biomass digester. The grass-based biomass digester according to claim 3 or 4 , wherein the cleaning means releases air bubbles from below in the grass-based biomass digester. A digestion system comprising a sewage digester grass system biomass digestion tank for sewage,
A pressure sensor for measuring the pressure of the gas in the grass biomass digester;
A discharge pipe for discharging the digestive liquid in the grass-based biomass nitrification tank, and an inflow pipe for allowing the digestive liquid in the sewage digester to flow into the grass- based biomass digestion tank; Cleaning means for cleaning the grass-based biomass using a digestive liquid in the sewage digester ,
A digestion system configured to start cleaning of the grass-based biomass by the cleaning means using the pressure of the gas measured by the pressure sensor as an index . A digestion system comprising a sewage digester for sewage and a grass biomass digester,
A flow rate sensor for measuring a flow rate of gas discharged from the grass biomass digester,
An exhaust pipe for discharging the digestive liquid in the grass-based biomass digester, and an inflow pipe for flowing the digested liquid in the sewage digester into the grass-based biomass digester, Cleaning means for cleaning the grass-based biomass using a digestion liquid in the sewage digestion tank,
Digestive system that is characterized by being configured to initiate cleaning of the grass biomass by the cleaning means a flow rate of the gas to be measured by the flow rate sensor as an index.

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