JP6598164B2 - Filtration device, digestive fluid filtration device, digestive fluid purification system and biomass processing system - Google Patents

Description

  The present invention relates to a filtration device, a digestive fluid filtration device using the same, a digestive fluid purification system using the same, and a biomass processing system using the same.

  Conventionally, when processing biomass by methane fermentation, a system for treating digestive juice obtained as a residue when biomass is methane-fermented is known (see, for example, Patent Document 1).

  The system of Patent Document 1 includes a separation device that separates a mixed solution in which an adsorbate that adsorbs phosphate ions into a digestion solution is separated into moisture and a solid component, and a pellet device that pellets the solid component separated by the separation device. With. The water separated by the separator is supplied to the fermenter and reused.

  The separating device includes a bottomed cylindrical rotating body having an inner surface whose diameter is increased upward, a net-like filter section disposed in an opening of the rotating body, a lid for closing the rotating body, and a filter section. And a lid portion having a moisture receiving portion for receiving moisture filtered through.

  According to this separation device, when the mixed liquid obtained by adding the adsorbate to the digested liquid is put into the rotating body and the rotating body is rotated by the motor, the mixed liquid is brought into its inner surface by the centrifugal force of the rotating body. Crawling up to reach the filter section.

  At this time, an adsorbate composed of rice bran, sawdust, oil cake, activated carbon or the like adheres to the net-like filter portion, functions as a filter, and solid components are filtered. The separated solid component can be pelletized and used as a fertilizer. On the other hand, the separated water is returned to the fermenter etc. and reused.

Japanese Patent Laying-Open No. 2006-10742

  According to the system of Patent Document 1 described above, the solid component can be recovered relatively easily because the solid component is separated in one form at the lower end of the filter unit. However, in order to be able to process a larger amount of biomass, a system capable of continuously and automatically processing the produced digestive juice is desired.

  In view of the above circumstances, an object of the present invention is to provide a filtration apparatus, a digestive juice filtration apparatus, a digestive juice purification system, and a biomass treatment system that can continuously and automatically process digestive juice.

The filtration device according to the first invention is
A first filter holding unit for holding a first filter for filtering a liquid material to be filtered in a mesh-like bag ;
A spraying unit for spraying the liquid material from above onto the first filter held by the first filter holding unit;
A second filter having an endless track shape that is coarser than the first filter that removes a relatively coarse solid material from the liquid material that is sprayed from the spraying unit and is traveling toward the first filter above the first filter. And a second filter moving part that moves along a circular orbit around the periphery of the first filter through above and below the first filter.

  According to the first aspect of the present invention, the relatively coarse solid matter is removed in advance from the liquid matter on the way to the first filter by the second filter that circulates around the first filter. And the number of exchanges can be reduced, and the removed solid matter can be easily and sequentially recovered from the circulating second filter. Therefore, continuous and automatic processing of the digestive juice can be achieved by using the filtration device of the first invention for the treatment of the digestive juice produced when methane fermentation of biomass.

The filtration device according to the second invention is the first invention,
From the second filter being moved by the second filter moving unit, a solid matter collecting unit for collecting the solid matter removed by the second filter,
The orbit is a trapezoidal track having a lower bottom shorter than the upper base, and returns from the upper base of the trapezoid through the first leg, the lower base, and the second leg to the upper base. Yes,
The first leg is inclined inward from the upper end to the lower end,
The solid matter recovery unit is provided so as to be rotatable outside a portion corresponding to the first leg of the orbit, and the solid matter adhered to the outside of the second filter is scraped by being rotated. It is characterized by including a rotating brush to be dropped.

  According to the second invention, the solid matter removed by the second filter can be continuously and easily scraped off from the second filter and recovered.

The filtration device according to the third invention is the first or second invention,
A cleaning liquid spraying head for spraying a cleaning liquid on the back surface of the orbital portion of the orbital track with the back surface of the second filter facing upward;
The cleaning liquid sprayed by the cleaning liquid spraying head is stored, and the cleaning liquid is provided with a cleaning tank provided so that a track portion of the circular track passes through the stored cleaning liquid.

  According to the third aspect of the invention, the surface of the second filter is directed downward in the orbit portion of the circular orbit where the back surface of the second filter faces upward. In this state, since the cleaning liquid is sprayed on the back surface of the second filter from above, the solid matter remaining on the surface of the second filter can be effectively removed. In addition, since the second filter in this state passes through the cleaning liquid stored in the cleaning tank, the second filter can be effectively cleaned and the solid matter remaining on the surface of the second filter can be dispersed in the cleaning liquid. it can.

  The filtration device according to a fourth aspect of the invention is characterized in that, in the third aspect of the invention, the filtration device includes a conduit and a pump for mixing the cleaning liquid stored in the cleaning tank with the liquid material sprayed by the spraying unit.

  According to the fourth aspect of the present invention, the solid material that has been removed by the second filter but remains on the second filter without being recovered and washed out in the cleaning liquid is mixed again with the liquid material sprayed by the spraying unit. Can be removed and recovered by the second filter.

  A digestive juice filtration apparatus according to a fifth aspect of the present invention includes any one of the filtration apparatuses according to the first to fourth aspects of the present invention, and filters the digestive juice that is a residue of methane fermentation by the filtration apparatus. . According to the fifth invention, the solid matter removed by the second filter can be recovered and reused as fertilizer.

  A digestive fluid purification system according to a sixth aspect of the invention includes the digestive fluid filtration device according to the fifth aspect of the present invention, and an explosion type purification tank that purifies the filtered digestive fluid filtered by the digestive fluid filtration device. To do. According to the sixth aspect of the present invention, the digested liquid can be purified to the extent that it can be finally discharged by purifying the filtered digested liquid filtered by the digestive liquid filtering device with the explosion type septic tank.

The biomass processing system according to the seventh invention is
A biomass processing system for generating generated gas containing methane by subjecting biomass to methane fermentation,
A hydrolysis tank for hydrolyzing the biomass;
A methane fermentation tank connected to the hydrolysis tank and fermenting the hydrolyzed biomass;
A digestive juice tank for storing digestive juice that is a residue after fermentation of the biomass in the methane fermentation tank;
The digestive fluid purification system according to the sixth aspect of the present invention purifies the digestive fluid stored in the digestive fluid tank.

  According to the seventh aspect of the invention, biomass can be treated effectively while reusing the gas generated by methane fermentation and the solid matter obtained in the process of purifying digestive juice by the digestive juice purification system.

It is an external view which shows the external appearance of the biomass processing system of this embodiment. It is a system block diagram which shows the whole structure of the biomass processing system of FIG. It is explanatory drawing which shows the specific structure of the 1st unit of FIG. 1, and a 2nd unit. FIG. 2 is a piping configuration diagram of the digestive juice purification system that can be used for purification of the digested juice produced in the biomass processing system of FIG. 1.

  As shown in FIG. 1 thru | or FIG. 3, the biomass processing system of this embodiment is a system which generate | occur | produces the generation gas containing methane by carrying out methane fermentation of biomass, Comprising: The pre-processing unit 10 and the 1st unit 11 The second unit 12, the third unit 13, and the fourth unit 14 are provided.

  The pretreatment unit 10 includes, for example, a crushing device 100 that crushes food residues such as leftovers and garbage, and generates a biomass raw material by crushing food residues such as leftovers and food waste by the crushing device 100.

  In FIG. 1, the preprocessing unit is provided in the first unit 11 to the fourth unit 14, but the preprocessing unit 10 is configured independently of the first unit 11 to the fourth unit 14. The first unit 11 to the fourth unit 14 may be installed in different places.

  For example, a waste disposal contractor who has collected food residues is disposed of as a waste by setting up a pretreatment unit 10 in a food residue accumulation site, and the disposal site or intermediate treatment facility is conventionally disposed of as waste. A large amount of biomass as a raw material for methane fermentation can be generated from the food residue.

  The first unit 11 includes a rainwater tank 111, a raw water tank 112, a hydrolysis tank 113, a solar water hot panel 114 and a solar power generation panel 115 installed on the roof of the housing 110. Prepare. Part of the solar power generation panel 115 is installed on the roof of the casing 120 of the second unit 12 (illustration of the solar power generation panel 115 is omitted in FIG. 2).

  The rainwater tank 111 is a tank that collects rainwater that has fallen on the roofs of the first unit 11 and the second unit 12. The rainwater in the rainwater tank 111 is sent to the solar hot water panel 114 and heated, and then the raw water. It is supplied to the tank 112.

  The raw water tank 112 stores raw water obtained by mixing and adjusting the biomass generated by the pretreatment unit 10 and the hot water heated by the solar hot water panel 114.

  In the hydrolysis tank 113, raw water mixed and adjusted in advance in the raw water tank 112 is supplied into the tank by a pump P.

  In the raw water tank 112 and the hydrolysis tank 113, the temperature of the raw water is adjusted to an appropriate temperature by the hot water heated by the solar hot water panel 114, a heater (not shown), or the like. The raw water tank 112 and the hydrolysis tank 113 are provided with a stirrer N driven by an electric motor M, and the raw water is appropriately stirred and mixed by the stirrer N.

  The second unit 12 includes a methane fermentation apparatus 121 and a desulfurization apparatus 122 housed in the housing 120.

  Here, the housing | casing 110 of the 1st unit 11 and the housing | casing 120 of the 2nd unit 12 are connectedly arranged adjacently on a straight line so that the process process of biomass may continue. As described above, the first unit 11 and the second unit 12 are integrally formed as a pair, and the first unit 11 and the second unit 12 are configured so as to be able to be loaded on a trailer integrally or separately. Furthermore, a plurality of the first unit 11 and the second unit 12 that are integrated can be provided as appropriate according to the amount of biomass fermentation treatment, and the entire system can be increased in size.

  In the methane fermentation apparatus 121, the biomass hydrolyzed in the hydrolysis tank 113 is supplied from the hydrolysis tank 113 by the pump P, and the supplied biomass is subjected to methane fermentation.

  The methane fermentation apparatus 121 includes a PH sensor PH, a temperature sensor t, and a heater H attached to the side wall, and is managed so that the pH and temperature are suitable for methane fermentation. A stirrer N driven by an electric motor M is provided, and the stirrer N performs stirring and mixing so that PH and temperature are uniform.

  The desulfurization apparatus 122 includes a plurality of desulfurization towers and removes hydrogen sulfide. The desulfurization device 122 is connected to an exhaust valve provided in the upper part of the methane fermentation device 121, and a generated gas containing methane generated as the methane fermentation of biomass in the methane fermentation device 121 progresses. Furthermore, by operating a plurality of valves provided in front of the desulfurization tower in accordance with the supply amount of the generated gas, the supply path of the generated gas can be changed, and the plurality of desulfurization towers are supplied with the generated gas. It can be used in a form suitable for the quantity.

  The third unit 13 includes a gas decomposition device 131 accommodated in the housing 130, a regeneration device 132 provided adjacent to the gas decomposition device 131, a desulfurization device 122 of the gas decomposition device 131 and the second unit 12, and And a generated gas tank 133 provided between the two.

  For example, by supplying methane gas between the discharge electrodes, the gas decomposition apparatus 131 decomposes methane and continuously generates a decomposition gas containing carbon and hydrogen.

  The regeneration device 132 is a variety of devices that use cracked gas as a recycled resource. For example, the storage device 132a that stores hydrogen in the cracked gas, a fuel cell 132b using the storage device 132a, an engine 132c that burns the cracked gas, and thereby This corresponds to the generator 132d that generates power, the compressor 132e that compresses the carbon component in the cracked gas, and the filler 132f that is filled with carbon.

  The generated gas tank 133 is supplied with a generated gas containing methane generated as the biomass methane fermentation proceeds in the methane fermentation apparatus 121 of the second unit 12 via the desulfurization apparatus 122, and the generated gas is temporarily stored. Is done. Therefore, even when a plurality of the first unit 11 and the second unit 12 are provided in parallel, the generated gas tank 133 functions as a buffer without directly supplying the generated gas supplied from them to the gas decomposition apparatus 131. With a simple configuration, the plurality of first units 11 and second units 12 can be supported.

  Here, by not providing the generated gas tank 133 in the housing 130, even when a plurality of the first units 11 and the second units 12 are provided at a later date, the capacity of the generated gas tank 133 can be increased accordingly. It is possible to cope with this by making it unnecessary to change the facilities of the entire three units 13.

  The fourth unit 14 includes a dehydrator 141 housed in the housing 140, a solidification device 142 provided adjacent to the dehydrator 141, and the dehydrator 141 and the methane fermentation apparatus 121 of the second unit 12. The digestive fluid tank 143 provided in the above.

  The dehydrator 141 dehydrates the digestive juice that is a residue after the methane fermentation of the methane fermentation apparatus 121. As the dehydration technique, various existing techniques can be employed. Further, the moisture obtained by dehydrating the digested liquid is filtered and then returned to the rainwater tank 111 of the first unit 11.

  The solidification device 142 solidifies the digestive juice residue dehydrated by the dehydration device 141. As the solidification technique, various existing techniques such as compression and drying can be adopted.

  In the digestive juice tank 143, digestive juice that is a residue after methane fermentation in the methane fermentation apparatus 121 of the second unit 12 is supplied via the pump P of the methane fermentation apparatus 121, and the digestive juice is temporarily stored. Therefore, even when a plurality of the first unit 11 and the second unit 12 are provided in parallel, the digestive juice tank 143 functions as a buffer without supplying the digestive juice supplied from these to the dehydrator 141, so that With such a configuration, the plurality of first units 11 and second units 12 can be configured.

  Here, by not providing the digestive juice tank 143 in the housing 140, even when a plurality of the first units 11 and the second units 12 are provided at a later date, the capacity of the digestive juice tank 143 is increased accordingly. It is possible to cope with this by making it unnecessary to change the equipment of the entire fourth unit.

  The above is the configuration of the biomass processing system of the present embodiment, and according to such a biomass processing system, the first unit 11 and the second unit 12 are configured integrally on a straight line, and a plurality of them are provided side by side. The whole can be enlarged according to the fermentation processing amount of biomass.

  Further, since the third unit 13 and the fourth unit 14 are configured to be capable of supporting a plurality of first units 11 and second units 12 that are integrated, a plurality of the first units 11 and the second units 12 are provided. Even when the entire system is enlarged, the third unit 13 and the fourth unit 14 are shared, so that the apparatus configuration is not complicated.

  Thus, according to the biomass processing system of this embodiment, it is possible to cope with an increase in the size of the entire system with a simple configuration.

  In the present embodiment, the generated gas tank 133 is not accommodated in the casing 130 of the third unit 13, but may be configured to be accommodated in the casing 130. Similarly, the digestive fluid tank 143 is not accommodated in the casing 140 of the fourth unit 14, but may be configured to be accommodated in the casing 140.

  FIG. 4 shows an example of a digestive juice purification system that can be employed in the biomass processing system of the present embodiment. As shown in FIG. 4, the digestive fluid purification system 150 includes a digestive fluid filtration device 151 that filters the digestive fluid as a liquid substance stored in the digestive fluid tank 143 of the biomass processing system, and the digestive fluid filtration device 151. And a double septic tank 154 having explosive septic tanks 152 and 153 for purifying the filtered digested liquid filtered by the above.

  The digestive fluid filtering device 151 disperses the digestive fluid from above onto the first filter holding unit 156 that holds the first filter 155 that filters the digestive fluid and the first filter 155 that is held by the first filter holding unit 156. And a second filter moving unit 159 that moves the second filter 158 having a coarser (lower accuracy) than the first filter 155 so as to pass over the first filter 155.

  The 1st filter holding | maintenance part 156 hold | maintains the 1st filter 155 in the cage | basket whose outer periphery is mesh shape. The first filter 155 includes, for example, a filter bed in which a filter medium is spread, a filter material having a particle size several times larger than the particle size of the filter medium, and a sponge material having a pore diameter smaller than the particle diameter of the filter medium. Contained in a bowl.

  As the filter medium, pumice, lava, pebbles, sand, glass cullet, hydrocone, and the like can be appropriately used according to the purpose. As the material of the filter material, shale, glass cullet and the like can be used. Such a filter is disclosed in Japanese Patent Laid-Open No. 2017-029014.

  The filtered digested liquid filtered by the first filter 155 (hereinafter referred to as “filtered digested liquid”) is received by the filtered liquid receiving tank 160 and stored in the lower filtered liquid storage tank 161. The first filter holding unit 156 is disposed in the filtered liquid receiving tank 160. The filtered liquid receiving tank 160 and the filtered liquid storage tank 161 are connected by a pipe line 162, and the filtered digested liquid in the filtered liquid receiving tank 160 is sent to the filtered liquid storage tank 161 by gravity.

  The first filter holding unit 156 is provided with liquid level switches 163 and 164 for monitoring the level of the digestive fluid. The filtered liquid storage tank 161 is provided with a liquid level switch 165 for monitoring the liquid level of the filtered digested liquid.

  The spraying unit 157 temporarily stores the digestive fluid transferred from the digestive fluid tank 143 and the digestion fluid for spraying the digestive fluid stored in the flow control tank 166 on the first filter 155 from above. Liquid spraying heads 167 and 168 are provided. Electric valves 171 and 172 and a plurality of opening and closing valves 173 to 175 whose opening / closing amounts can be controlled by motors 169 and 170 are provided between the flow rate adjusting tank 166 and the respective digestive fluid spraying heads 167 and 168. The supply of the digestive fluid from the flow rate adjusting tank 166 to the digestive fluid spraying heads 167 and 168 is performed by gravity.

  The digestive fluid tank 143 and the flow rate adjustment tank 166 are connected by a pipe line 176. The pipe 176 is provided with a pump 177 and opening / closing valves 178 and 179 on both sides thereof. The digestion liquid is transferred from the digestion liquid tank 143 to the flow rate adjustment tank 166 by the pump 177.

  The flow rate adjustment tank 166 is provided with liquid level switches 180 and 181 for detecting the upper limit and the lower limit of the liquid level of the digestive liquid. The amount of digestion fluid transferred by the pump 177 is controlled so that the liquid level is within the upper and lower limits. In order to prevent the flow rate adjustment tank 166 from overflowing, a pipe line 182 connecting the upper end portion of the flow rate adjustment tank 166 and the digestive fluid tank 143 is provided.

  The second filter moving unit 159 moves the second filter 158 having an endless track shape along a circular trajectory that goes around the first filter 155 through the upper side and the lower side of the first filter 155. The second filter moving unit 159 includes one driving wheel 183, three driven wheels 184, and a motor 185 that rotates the driving wheel 183. The second filter 158 is wound around the drive wheel 183 and the driven wheel 184, and can be moved on the orbit by rotating the drive wheel 183 with the motor 185.

  The second filter 158 is a coarser (less accurate) filter than the first filter 155, and removes a relatively coarse solid from the digestive juice that is sprayed from the spraying unit 157 and goes to the first filter 155. Remove above 1 filter 155. As the second filter 158, for example, a wire mesh filter can be used.

  The orbit around the periphery of the first filter 155 is a trapezoidal orbit having a lower bottom shorter than the upper base located above the first filter 155, and the first leg, the lower bottom, and the second bottom from the upper base. It is a trajectory that returns to the upper base through the legs. The first leg and the second leg are inclined inward from the upper end to the lower end.

  In the vicinity of the second filter moving unit 159, a solid material collecting unit 186 that collects the solid material removed by the second filter 158 from the second filter 158 moved by the second filter moving unit 159 is provided. The solid matter recovery unit 186 includes a rotating brush 187 provided so as to be able to rotate outside the portion corresponding to the first leg in the orbit, and a motor 188 that rotates the rotating brush 187.

  The rotating brush 187 is configured to scrape off the solid matter attached to the outside of the second filter 158 by being rotated by the motor 188. The solid matter scraped off is sequentially conveyed by the conveying means 189.

  Further, in the above-described orbit, the orbital portion where the back surface of the second filter 158 faces upwards, the cleaning liquid spraying head 190 for spraying the cleaning liquid on the back surface from above, and the cleaning liquid storing the cleaning liquid sprayed by the cleaning liquid spraying head 190 are stored. A tank 191 is provided. The cleaning tank 191 is provided so that the track portion of the circular track passes through the cleaning liquid stored thereby.

  That is, the track portion with the back surface of the second filter 158 facing upward is a portion corresponding to the lower base of the trapezoid in the circular track, and this portion passes through the cleaning liquid in the cleaning tank 191.

  The cleaning liquid spraying head 190 is connected to a purified water source via an open / close valve 192 and an electric valve 194 whose opening / closing amount is controlled by a motor 193. The liquid level of the cleaning tank 191 is monitored by an upper / lower limit liquid level switch 195 that can control the upper and lower limits of the liquid level, and the electric valve 194 is controlled so as to be a constant level.

  Between the cleaning tank 191 and the flow rate adjustment tank 166, a pipe 196 and a pump 197 are provided for mixing the cleaning liquid accumulated in the cleaning tank 191 with the digested liquid sprayed by the spraying section 157.

  The filtered liquid storage tank 161 is connected to the septic tank 152 via the pump 199 and the small flow rate measuring tank 200 in order to transfer the filtered liquid stored therein to the septic tank 152. Air is supplied to the septic tanks 152 and 153 from the blower 201 via the floaters 202 and 203, respectively. On-off valves 204 and 205 are provided between the blower 201 and the floaters 202 and 203.

  In the digestive fluid purification system 150, while digestive fluid is being purified, the digestive fluid in the digestive fluid tank 143 is sequentially sent to the flow rate adjustment tank 166 via the conduit 176 by the pump 177. In parallel with this, the cleaning liquid containing the solids removed by the second filter 158 in the cleaning tank 191 but not recovered by the solid recovery unit 186 but washed away in the cleaning tank 191 by the pump 197 is obtained. It is sent to the flow rate adjustment tank 166.

  At this time, the liquid level switches 180 and 181 monitor the liquid level of the flow rate adjusting tank 166 and control the driving of the pumps 177 and 197 so that the liquid level is between the upper limit and the lower limit.

  The digestive fluid in the flow rate adjusting tank 166 is sprayed from the digestive fluid spraying heads 167 and 168 toward the first filter 155 while adjusting the spraying amount by the motors 169 and 170. The motors 169 and 170 are controlled based on the detection values of the liquid level switches 163 and 164 so that the liquid level of the first filter holding unit 156 does not exceed a predetermined upper limit. Note that the digestive liquid in the flow rate adjusting tank 166 includes a cleaning liquid containing solids sent from the cleaning tank 191, but the digestive liquid in this state is simply referred to as “digestive liquid”.

  The digestive fluid sprayed toward the first filter 155 passes through the second filter 158 moved by the second filter moving unit 159 and then reaches the first filter 155. At this time, the solid matter is removed from the digested liquid by the second filter 158. The removed solid matter is collected as much as possible in the solid matter collecting unit 186.

  The solid matter that could not be collected is washed with the second filter 158 together with the washing liquid in the washing tank 191 and dispersed in the washing liquid. Further, the cleaning of the solid is more effectively performed by the cleaning liquid sprayed from the cleaning liquid spraying head 190.

  The cleaning liquid in the cleaning tank 191 is replenished with the sprayed cleaning liquid and transferred to the flow rate adjusting tank 166. The liquid level is monitored by the upper / lower limit liquid level switch 195, and the upper / lower limit liquid level is monitored. A constant level is maintained by controlling the motor e, the pump b, and the like based on the output of the switch 195.

  The digested liquid that has reached the first filter 155 is filtered by the first filter 155, finer solids are removed, collected by the filtered liquid receiving tank 160, sent to the filtered liquid storage tank 161, and stored. The The stored filtered digested liquid is sent to the septic tank 152 through the flow rate measuring tank 200 by the pump 199. The filtered digested liquid sent to the septic tank 152 is purified in the septic tank 152 and further purified by the septic tank 153.

  As a result, the filtered digestive juice has a COD value that meets or close to the predetermined drainage standard, and can be used for drainage, etc., but it can be reused by returning it to the rainwater tank 111 (FIG. 2). Also good.

  As described above, according to the present embodiment, the relatively coarse solid is previously removed from the digestive juice on the way to the first filter 155 by the second filter 158 that circulates around the first filter 155. Therefore, the clogging of the first filter 155 can be prevented to reduce the number of replacements, and the removed solid matter can be easily and sequentially recovered from the second filter 158 in circulation. Therefore, continuous and automatic processing of digestive juice can be achieved.

  Further, since the solid is collected by the rotating brush 187 provided outside the orbit around which the second filter 158 circulates, the solid can be collected automatically and easily. Further, the solid matter remaining on the second filter 158 without being collected is automatically washed in the washing tank 191 with the surface of the second filter 158 facing downward, and the solid matter dispersed in the washing liquid is adjusted again. Since it is returned to the tank 166, solids can be more reliably collected.

  Therefore, according to the biomass processing system of the present embodiment, the biomass is effectively processed while recycling the gas generated by methane fermentation and the solid matter obtained in the purification process by the digestive juice purification system 150. Can do.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this. For example, the digestive fluid filtration apparatus can be used not only for filtering digestive fluid but also for filtering liquid materials containing other useful solids.

DESCRIPTION OF SYMBOLS 10 ... Pretreatment unit, 11 ... 1st unit, 12 ... 2nd unit, 13 ... 3rd unit, 14 ... 4th unit, 100 ... Crushing device, 111 ... Rain water tank, 112 ... Raw water tank, 113 ... Hydrolysis tank 121 ... Methane fermentation device, 122 ... Desulfurization device, 131 ... Gas decomposition device, 132 ... Regeneration device, 133 ... Generation gas tank, 141 ... Dehydration device, 142 ... Solidification device, 143 ... Digestion solution tank, 150 ... Digestion solution purification system 151 ... Digestive fluid filtration devices 152, 153 ... Septic tanks, 154 ... Dual septic tanks, 155 ... First filter, 156 ... First filter holding part, 157 ... Scattering part, 158 ... Second filter, 159 ... Second filter Moving unit, 160 ... filtered liquid receiving tank, 161 ... filtered liquid storage tank, 162 ... pipe, 163, 164, 165 ... liquid level switch, 166 ... flow rate Adjusting tank, 167, 168 ... Digestive fluid spraying head, 169, 170 ... Motor, 171, 172 ... Electric valve, 173-175 ... Open / close valve, 176 ... Pipe line, 177 ... Pump, 178, 179 ... Open / close valve, 180, 181 ... Liquid level switch, 182 ... Pipe line, 183 ... Drive wheel, 184 ... Driven wheel, 185 ... Motor, 186 ... Solid matter recovery unit, 187 ... Rotating brush, 188 ... Motor, 189 ... Conveying means, 190 ... Scattering of cleaning liquid Head, 191 ... Cleaning tank, 192 ... Open / close valve, 193 ... Motor, 194 ... Electric valve, 195 ... Upper / lower limit level switch, 196 ... Pipe, 197 ... Pump, 199 ... Pump, 200 ... Flow rate measuring tank, 201 ... Blower, 202, 203 ... floater, 204, 205 ... open / close valve.

Claims (7)

A first filter holding unit for holding a first filter for filtering a liquid material to be filtered in a mesh-like bag ;
A spraying unit for spraying the liquid material from above onto the first filter held by the first filter holding unit;
A second filter having an endless track shape that is coarser than the first filter, which removes a relatively coarse solid material from the liquid material on the way to the first filter that is sprayed from the spraying unit, above the first filter. And a second filter moving section that moves along a circular orbit around the first filter through the upper and lower sides of the first filter. From the second filter being moved by the second filter moving unit, a solid matter collecting unit for collecting the solid matter removed by the second filter,
The circling track is a trapezoidal track having a lower bottom that is shorter than the upper base, and is such a track that returns from the upper base of the trapezoid through the first leg, the lower base, and the second leg to the upper base. Yes,
The first leg is inclined inward from the upper end to the lower end,
The solid matter recovery unit is provided so as to be able to rotate outside a portion corresponding to the first leg of the orbit, and the solid matter adhering to the outside of the second filter is scraped by being rotated. The filtration device according to claim 1, further comprising a rotating brush that drops. A cleaning liquid spraying head for spraying a cleaning liquid on the back surface of the orbital portion of the orbital track with the back surface of the second filter facing upward;
The cleaning liquid sprayed by the cleaning liquid spraying head is stored, and a cleaning tank is provided so that the track portion of the circular track passes through the stored cleaning liquid. The filtration apparatus as described in.   The filtration apparatus according to claim 3, further comprising a pipe and a pump for mixing the cleaning liquid stored in the cleaning tank with the liquid material sprayed by the spraying unit.   A digestive fluid filtration device comprising the filtration device according to any one of claims 1 to 4, wherein the digestive fluid that is a residue of methane fermentation is filtered by the filtration device. A digestive fluid filtration device according to claim 5;
A digestive fluid purification system comprising: an explosive septic tank that purifies the filtered digestive fluid filtered by the digestive fluid filtration device. A biomass processing system for generating generated gas containing methane by subjecting biomass to methane fermentation,
A hydrolysis tank for hydrolyzing the biomass;
A methane fermentation tank connected to the hydrolysis tank and fermenting the hydrolyzed biomass;
A digestive juice tank for storing digestive juice that is a residue after fermentation of the biomass in the methane fermentation tank;
A biomass treatment system comprising the digestive fluid purification system according to claim 6 for purifying digestive fluid stored in the digestive fluid tank.