JP4641271B2 - Fermenter charging method and processing apparatus for organic substance-containing liquid - Google Patents

Description

The present invention relates to a fermenter charging method and a processing apparatus for an organic substance-containing liquid, and in particular, to a method for introducing an organic substance-containing liquid to be processed into a fermenter that decomposes an organic substance-containing liquid by contact with a methane fermentation microorganism group and to the implementation of the method. The present invention relates to an organic substance-containing liquid processing apparatus to be used.
INDUSTRIAL APPLICABILITY The present invention can be effectively used for a waste recycling type methane fermentation facility that decomposes a ground slurry of organic waste by contact with a methane fermentation microorganism group and recovers biogas as energy. .

  Aiming at the formation of a recycling-oriented society, food waste generated from ordinary households, hotels, restaurants, etc. that have been incinerated or landfilled in the past, food production residues from food factories, agriculture, forestry, fisheries, Recycling technology for recovering energy from organic waste such as animal and plant residues discharged from livestock facilities and factories by methane fermentation treatment has been developed and promoted. For example, Patent Documents 1 and 2 disclose a bioreactor (hereinafter referred to as a fermenter) in which a carrier to which a methane fermentation microorganism group (hereinafter referred to as a decomposing microorganism) is attached after finely pulverizing organic waste in a slurry state. Disclosed is a method for treating organic waste that is charged and decomposed by bringing the waste slurry into contact with the decomposing microorganism at a temperature at which the decomposing microorganism is active. Patent Document 3 discloses a system in which an organic waste slurry is sent to a fermentor to be converted into biogas and residual organic matter, and power energy is recovered from the biogas by a fuel cell, and fertilizer and feed are recovered from the residual organic matter. Is disclosed. The methods of Patent Documents 1 to 3 are also applicable when energy is recovered from organic wastewater or the like using methane fermentation in a sewage treatment plant or a human waste treatment plant.

  In the methane fermentation treatment of Patent Documents 1 to 3, a fermenter is used to efficiently and stably perform methane fermentation of pulverized slurry of organic waste, organic waste water, and the like (hereinafter collectively referred to as organic substance-containing liquid S). The organic substance-containing liquid (fermented liquid) S in the inside needs to be properly stirred to be uniform and kept at an optimal fermentation temperature. Various agitation methods can be employed. For example, in the small-sized fermenter 1, as shown in FIG. 5C, an agitator 45 with a stirring blade 46 is provided on the upper part of the fermenter 1, and the organic substance-containing liquid S in the fermenter 1 is provided. A method is used in which the agitator is agitated by the rotation of the agitating blade 46. On the other hand, in the fermenter 1 provided with the large-scale fermenter 1 and the microorganism fixed bed 2 (see FIG. 4), an external circulation path with a pump 6 is provided in the fermenter 1 as shown in FIGS. 5, and a method of stirring the organic substance-containing liquid S in the fermenter 1 by circulation through the circulation path 5 (circulation type stirring method) is employed.

  FIG. 5 (A) shows that the organic substance-containing liquid S in the fermenter 1 is extracted from the lower part and returned to the upper part to circulate the organic substance-containing liquid S while forming a downward flow in the fermenter 1 (hatched line in the figure). (Refer to the attached arrow, downward flow type circulation stirring method). On the other hand, FIG. 5 (B) circulates the organic substance-containing liquid S while forming an upward flow in the fermenter 1 by extracting the organic substance-containing liquid S in the fermenter 1 from the upper part and returning it to the lower part (FIG. (See the shaded arrow in the inside, upward-flow circulation type stirring method). The downward flow type in FIG. 6A can destroy the scum layer formed on the surface of the organic substance-containing liquid S, and the upward flow of biogas generated in the fermenter 1 (see the white arrow in the figure). This is superior to the upward flow type in FIG. 5B in that an effective stirring of the organic substance-containing liquid S can be expected due to the intersection with.

  FIG. 4A shows an example of a conventional methane fermentation treatment system that recovers the biogas G from the organic substance-containing liquid S. The organic substance-containing liquid S stored in a storage tank 30 such as a slurry tank is supplied to the inlet 33 at the top of the fermenter 1 via a supply path 32 by a pump 31 such as a rotary pump, a screw pump, or a tube pump dedicated to slurry. Input at an appropriate flow rate. The fermenter 1 in the illustrated example is an airtight tank maintained in an anaerobic state, and has a fixed bed 2 to which decomposed microorganisms are attached, and is externally circulated between a lower outlet 3 and an upper outlet 8. A path 5 is provided. The organic substance-containing liquid S charged in the fermenter 1 stays in the fermenter 1 for a required time while being stirred by the downward flow circulation type stirring method, and comes into contact with the decomposing microorganisms for biogas G and treatment liquid W. Is broken down into The treated liquid W after the treatment is discharged from the bottom of the fermenter 1, and after advanced treatment at a secondary treatment facility as necessary, it is discharged into sewers and rivers. The residence time of the organic substance-containing liquid S in the fermenter 1 can be adjusted by the supply flow rate of the pump 31 and the discharge flow rate of the processing liquid W. The biogas G produced in the fermenter 1 is desulfurized by the desulfurizer 36 as needed, and then recovered outside the processing system.

Japanese Patent No. 270887 JP 10-005718 A Japanese Patent No. 3064272

  However, in the methane fermentation treatment system of FIG. 4 (A), when the input port 33 of the organic substance-containing liquid S to the fermenter 1 is one place as shown in FIG. 3 (A), the input organic substance-containing liquid S is input. There is a case where the methane fermentation process stays under the mouth 33 and cannot maintain a stable methane fermentation treatment in the fermenter 1. The reaction process of the methane fermentation treatment until the organic substance in the organic substance-containing liquid S is decomposed to produce the final gas product G can be roughly divided into three stages. In the first stage, an organic substance is hydrolyzed by a hydrolyzing bacterium in the decomposing microorganism to be decomposed into a low molecular weight organic substance (hydrolysis reaction). In the second stage, an organic substance having a low molecular weight is decomposed into an organic acid such as acetic acid (acid fermentation reaction) by the acid-fermenting bacteria in the decomposing microorganism. In the final stage, the organic acid is decomposed into methane and carbon dioxide by the methanogen in the decomposing microorganism (methane production reaction). Among these reactions, hydrolysis reaction and acid fermentation reaction proceed relatively easily, but the methanogenesis reaction is inhibited when the concentration of organic acids such as formic acid and acetic acid used by methanogens becomes too high. When the organic substance-containing liquid S is introduced into the fermenter 1 from a single inlet 33, the organic substance-containing liquid S is intensively supplied to the liquid surface F immediately below the inlet 33, where microbial reactions occur locally. Since the local organic acid concentration rises and the pH falls in the organic substance-containing liquid S, the microorganisms may die and the efficiency of the microbial reaction may be lowered.

  In order to avoid local residence of the organic substance-containing liquid S in the fermenter 1 of FIG. 4 (A), a plurality of outlets 8 are provided in the supply path 32 of the organic substance-containing liquid S to the fermenter 1 as shown in FIG. 3 (B). The organic substance-containing liquid S can be evenly distributed to the outlets 8 and dispersed over the entire liquid surface F in the fermenter 1. However, in this method, when the organic substance-containing liquid S contains a large amount of solids and has a high viscosity, in order to avoid clogging, the pipe diameters of the supply path 32 and the plurality of outlets 8 of the fermenter 1 are increased to some extent, In order to distribute evenly from the supply path 32 to the plurality of outlets 8, it is necessary to supply the organic substance-containing liquid S at a sufficient flow rate. In an actual methane fermentation facility, the amount of organic substance-containing liquid S generated (for example, the amount of organic waste recovered) is small, and it is often difficult to secure a supply flow rate that can be evenly distributed to the plurality of outlets 8. If the organic substance-containing liquid S is diluted with a large amount of water, it is possible to easily disperse the organic substance-containing liquid S by decreasing the viscosity and simultaneously increasing the flow rate. However, since the amount of water increases, the recovery efficiency of the biogas G decreases. In order to increase the recovery efficiency, the capacity of the fermenter 1 needs to be increased. Moreover, the running cost (for example, the energy required for heating the fermenter 1 or the capacity of the circulation pump 6 increases and the cost for power) increases.

  Patent Document 1 discloses a method of supplying the organic substance-containing liquid S to the circulation path 5 of the fermenter 1 as shown in FIG. If the organic substance-containing liquid S in the supply path 32a is mixed with the organic substance-containing liquid S in the circulation path 5 (hereinafter also referred to as the circulation liquid S) and then introduced into the fermenter 1, the organic substance-containing liquid S in the supply path 32a. Even when the flow rate is small, the flow rate in the circulation path 5 is sufficient, so that the organic substance-containing liquid S can be evenly distributed to the plurality of outlets 8 while being mixed with the circulating liquid S.

  However, in the downward flow circulating stirring method as shown in FIG. 4B, the water pressure of the fermenter 1 is applied to the upstream side of the pump in the circulation path 5, and the water pressure is also applied to the downstream side of the pump in the circulation path 5. The pump pressure is applied, and the circulation path 5 is always pressurized. For this reason, when the supply path 32a of the organic substance-containing liquid S is directly connected to the circulation path 5 as shown in the drawing, the circulation path is used when the supply pump 31 is stopped for some reason or when a seal leak occurs in the supply path 32a. There is a risk of causing a serious accident in which the circulating fluid S in 5 flows back to the supply path 32a and leaks outside. Even if a check valve for preventing the backflow of the circulating fluid S is installed in the supply path 32a, there is a possibility that the solid content contained in the organic substance-containing liquid S may block the check valve and the check valve does not function sufficiently. is there. In addition, even if the supply path 32b is held higher than the connection point with the circulation path 5 as indicated by the dotted line in the figure, the circulating fluid S may flow back to the supply path 32a due to the siphon phenomenon. It is difficult to reliably prevent external leakage of S.

  Then, the objective of this invention is providing the fermenter input method and processing apparatus of the organic substance containing liquid which can maintain the stable fermentation process of the organic substance containing liquid safely.

Referring to the embodiment of FIG. 1, the fermenter charging method of the organic matter-containing liquid according to the present invention includes the fermenter 1 that holds the decomposed microorganisms and decomposes the organic matter-containing liquid S by contact with the microorganisms. An external circulation path 5 with a pump 6 that returns the liquid S from the lower part and returns to a plurality of discharge ports 8 distributed at the top is provided, the bottom is connected to the circulation path 5 at the level of the liquid level L of the fermenter 1 and The top space 13 holds a liquid tank 10 communicating with the upper space 4 in the fermenter 1, and the organic substance-containing liquid S is taken into the top space 13 of the liquid tank 10 from the bottom of the liquid tank 10 to the circulation path 5. To the fermenter 1 from the plurality of discharge ports 8 together with the circulating fluid S in the circulation path 5.

  Preferably, the top and bottom of the liquid storage tank 10 are connected to the pump downstream side 5b and the upstream side 5a of the circulation path 5, and the organic matter-containing liquid S to be treated enters the liquid storage tank 10 from the pump downstream side 5b of the circulation path 5. It mixes with the circulating fluid S drawn in and is supplied to the pump upstream side 5a of the circulation path 5.

Referring to the embodiment of FIG. 1, the processing apparatus for organic matter-containing liquid according to the present invention includes a fermenter 1 that holds decomposed microorganisms and decomposes the organic matter-containing liquid S by contact with microorganisms, and contains organic matter in the fermenter 1. The liquid S is withdrawn from the bottom and returned to a plurality of discharge ports 8 distributed at the top, and is attached to the external circulation path 5 with a pump 6, maintained at the level of the liquid level L of the fermenter 1, and the bottom is connected to the circulation path 5. The liquid tank 10, the pressure equalization path 18 that connects the top of the liquid tank 10 and the upper space 4 in the fermentation tank 5, and the supply of the organic substance-containing liquid S to be treated connected to the top of the liquid tank 10 A road 32 is provided.

  Preferably, the bottom of the liquid reservoir tank 10 is connected to the pump upstream side 5a of the circulation path 5, and the retraction path 15 with the control valve 16 is drawn into the top of the liquid reservoir tank 10 from the pump downstream side 5b of the circulation path 5. Is provided.

The fermenter charging method and the processing apparatus of the organic substance-containing liquid according to the present invention are such that the bottom is connected to the circulation path 5 at the liquid level L of the fermenter 1 and the top space 13 is connected to the upper space 4 in the fermenter 1. A liquid reservoir tank 10 is held, and the organic substance-containing liquid S to be treated is taken into the top space 13 of the liquid reservoir tank 10 and supplied from the bottom of the liquid reservoir tank 10 to the external circulation path 5 of the fermenter 1. Since it introduce | transduces in the fermenter 1 via the some discharge port 8 disperse | distributed and arrange | positioned at the top part of the fermenter 1 with the circulating fluid S of this, there exists the following remarkable effect.

(A) Since the organic matter-containing liquid S to be treated is dispersed and introduced from the plurality of discharge ports 8 to the liquid surface in the fermenter 1, avoiding local retention of the organic substance-containing liquid S in the fermenter 1, The stable fermentation within 1 can be maintained.
(B) Since the organic substance-containing liquid S to be treated is introduced into the fermenter 1 together with a large amount of the circulating liquid S in the circulation path 5, even if the organic substance-containing liquid S is small, it is evenly distributed to the plurality of discharge ports 8. It can be dispersed and put into the fermenter 1.
(C) A top space 13 communicating with the upper space 4 in the fermenter 1 is provided in the liquid storage tank 10, and the supply path 32 for the organic substance-containing liquid S to be treated is connected to the top space 13 of the liquid storage tank 10 and the liquid By connecting the bottom of the storage tank 10 to the circulation path 5, the back space of the organic substance-containing liquid S from the circulation path 5 to the supply path 32 can be effectively prevented by the top space 13.

(D) By allowing a decomposition treatment additive such as a neutralizing agent to flow into the liquid storage tank 10, the additive can be evenly distributed and introduced onto the liquid surface in the fermenter 1 together with the organic matter-containing liquid S to be treated.
(E) By connecting the top and bottom of the liquid storage tank 10 with the pump downstream side 5b and the upstream side 5a of the circulation path 5, the circulating liquid containing the organic substance to be treated S drawn from the pump downstream side 5b of the circulation path 5 It becomes possible to supply to the pump upstream side 5a of the circulation path 5 after sufficiently reducing the viscosity by mixing with S.
(F) In addition, the liquid tank 10 and the fermenter 1 are connected at a liquid level, and the fermenter 1 is connected to the pump downstream side 5b of the circulation path 5 via the switching valve 20. It becomes possible to discharge the floating foreign matter inside the liquid level to the foreign matter tank 21 via the liquid reservoir tank 10.

  FIG. 1 shows an embodiment of the treatment apparatus of the present invention that recovers biogas G by decomposing an organic substance-containing liquid S, which is a pulverized slurry of organic waste, by contact with decomposing microorganisms. The processing apparatus of the illustrated example has an external circulation path 5 with a pump 6 that circulates the fermenter 1 holding the decomposing microorganisms and the organic substance-containing liquid S in the fermenter 1 in a downward flow manner (see FIG. 5A). And a liquid storage tank 10 connected to the circulation path 5.

  The fermenter 1 in the illustrated example is an airtight tank similar to the conventional fermenter shown in FIG. 4, and has a microorganism fixed bed 4 inside, and the hydrolyzed bacteria, acid fermenting bacteria, and methane described above in the fixed bed 4. Decomposing microorganisms containing bacteria and the like are retained. The fixed bed 4 is formed by regularly arranging an appropriate carrier to which a degrading microorganism can adhere at a high concentration, for example, a hollow cylindrical carrier made of glass fiber or carbon fiber. However, the fermenter 1 to which the present invention is applied is not limited to the fermenter 1 having the fixed bed 4 as long as it holds a decomposing microorganism.

  The circulation path 5 in the illustrated example has a circulation pump 6, a pump upper flow path 5 a connecting one end of the circulation pump 6 to the lower outlet 3 of the fermenter 1, and the other end of the circulation pump 6 connected to the top of the fermenter 1. And a dispersion discharger 7 attached to the fermenter side end of the pump lower flow path 5b. The dispersion | distribution discharger 7 has the some discharge port 8 distributedly arrange | positioned at the top surface 9 of the fermenter 1, as shown to FIG. 3 (B). The organic substance-containing liquid S in the fermenter 1 is extracted from the outlet 3 by the circulation pump 6 via the pump upper flow path 5a, sent to the dispersion discharger 7 via the pump lower flow path 5b, and a plurality of discharge ports 8 of the dispersion discharger 7 Is circulated by returning to the fermenter 1. The flow rate of the circulating fluid S in the circulation path 5 can be adjusted by the circulation pump 6 so that the circulating fluid S in the circulation path 5 is evenly distributed to the plurality of discharge ports 8.

  The liquid storage tank 10 in the illustrated example is maintained at the level of the liquid level L of the fermenter 1, and has a top inlet 11 connected to the supply path 32 for the organic matter-containing liquid S to be treated and a bottom connected to the circulation path 5. And an outlet 12. The liquid storage tank 10 has a capacity not filled with the organic substance-containing liquid S flowing from the inlet 11, and a top space 13 is provided between the liquid surface of the organic substance-containing liquid S stored in the tank and the inlet 11 at the top of the tank. . By the top space 13 provided in the liquid storage tank 10, the organic substance-containing liquid S in the supply path 32 and the circulating liquid S in the circulation path 5 are once cut (edge cut) in the liquid storage tank 10 and supplied from the circulation path 5. Liquid leakage or liquid outflow to the path 32 can be prevented.

  Preferably, the liquid storage tank 10 is a sealed tank, and a pressure equalizing path 18 is provided to communicate the top of the liquid storage tank 10 with the upper space 4 in the fermentation tank 5. The upper space 4 in the fermenter 5 can become high pressure due to the biogas G produced during fermentation. If the pressure is equal to 4, the liquid level in the liquid storage tank 10 can always coincide with the liquid level L in the fermenter 1. However, the sealing of the liquid storage tank 10 is not essential to the present invention, and the liquid storage tank 10 may be sufficient if it can form the top space 13 described above, and may be a top open tank, for example.

  In the illustrated example, the bottom of the liquid storage tank 10 is held at a level higher than the pump upstream side 5 a of the circulation path 5, and the outlet 12 at the bottom of the liquid storage tank 10 is connected to the upstream side of the circulation path 5 via the outflow path 17. The organic substance-containing liquid S in the liquid storage tank 10 is caused to flow down to the pump upstream side 5a of the circulation path 5 by gravity. The arrangement level of the liquid storage tank 10 is not limited to the illustrated example, and an appropriate pump may be provided between the liquid storage tank 10 and the circulation path 5. However, when the organic substance-containing liquid S contains a large amount of solids and has a high viscosity, the outflow path 17 may be blocked by the organic substance-containing liquid S flowing down in the outflow path 17 at a low pressure.

  Desirably, the top of the liquid storage tank 10 is held at a level below the pump downstream side 5b of the circulation path 5 as shown in the drawing, and the circulating liquid S is supplied to the top of the liquid storage tank 10 from the pump downstream side 5b of the circulation path 5. A service passage 15 with a control valve 16 is provided. Since the circulation liquid S in the circulation path 5 is fermented, the organic matter is decomposed by about 90%, and the clay is about 1/10 of the organic matter-containing liquid S in the supply path 32. In the liquid storage tank 10, the organic substance-containing liquid S in the supply path 32 is mixed with the circulating liquid S drawn from the pump downstream side 5b of the circulation path 5, and the viscosity of the organic substance-containing liquid S is lowered to increase the pump upstream side 5a of the circulation path 5. By flowing down, the outflow passage 17 is prevented from being blocked. The viscosity of the organic substance-containing liquid S flowing down to the outflow path 17 can be adjusted by the amount of the circulating liquid S drawn by the control valve 16.

  The organic substance-containing liquid S to be treated is guided from the storage tank 30 through the supply pump 31 and the supply path 32 to the inlet 11 at the top of the liquid storage tank 10 at an appropriate flow rate, and enters the top space 13 in the liquid storage tank 10. Supplied. In the liquid storage tank 10, the viscosity of the organic substance-containing liquid S is adjusted by mixing with the circulating liquid S drawn from the drawing path 15. After the viscosity adjustment, the organic substance-containing liquid S is caused to flow down from the bottom outlet 12 to the circulation path 5 via the outlet path 17. For example, considering the relationship between the supply flow rate of the supply pump 31 and the flow rate of flow down to the outflow passage 17 and the amount of circulating fluid S drawn from the draw-in passage 15, for example, the liquid level in the liquid storage tank 10 is substantially intermediate Adjust to position. By supplying the organic substance-containing liquid S to the top space 13 in the liquid storage tank 10, even if a failure of the supply pump 31 occurs, the top space 13 in the liquid storage tank 10 causes the organic matter in the circulation path 5. It is possible to reliably prevent the contained liquid S from flowing back into the supply path 32a or flowing in due to a siphon phenomenon.

  The organic substance-containing liquid S supplied to the circulation path 5 is sent to the dispersion discharger 7 at the top of the fermenter 1 together with the circulation liquid S in the circulation path 5 by the circulation pump 6. A heat exchanger 35 is connected to the downstream side 5b of the pump 5 in the circulation path 5 in the illustrated example, and the circulating liquid S in the circulation path 5 is optimally fermented by heat exchange with an appropriate high-temperature fluid H in the heat exchanger 35. Heated to temperature. Further, the flow rate of the circulating fluid S in the circulation path 5 is adjusted so as to be evenly distributed to the plurality of discharge ports 8. The organic substance-containing liquid S supplied to the circulation path 5 is heated together with the circulation liquid S in the heat exchanger 35, and then dispersed and fed from the plurality of discharge ports 8 to the entire liquid surface F in the fermenter 1. By dispersing and introducing the organic substance-containing liquid S over the entire liquid surface, a local increase in organic acid concentration and pH in the fermenter 1 are prevented, and the fermentation process in the fermenter 1 is stably promoted. it can.

  Thus, it is possible to achieve the “objective method and apparatus for fermenting an organic substance-containing liquid that can safely maintain a stable fermentation treatment of the organic substance-containing liquid”, which is an object of the present invention.

  FIG. 2 shows another embodiment of the processing apparatus for the organic substance-containing liquid S according to the present invention. The liquid reservoir tank 10 in the figure has a supply port 28 for a decomposition treatment additive such as a neutralizing agent and a micronutrient, and the supply port 28 is connected to the additive tank 26 via an additive transport path 27. By supplying the additive from the additive tank 26 to the liquid storage tank 10 as necessary, the additive is sent to the dispersion discharge device 7 at the top of the fermenter 1 together with the organic substance-containing liquid S, and the liquid level in the fermenter 1 It is possible to disperse and put in the whole of F. By providing an appropriate control valve or pump in the additive transport path 27, the amount of additive added can be adjusted.

  In the embodiment of FIG. 2, the fermenter 1 and the liquid storage tank 10 are connected at a liquid level L by a foreign matter discharge passage 24 with an opening / closing valve 23, and the switching valve 20 is connected to the pump downstream side 5 b of the circulation passage 5. A foreign matter tank 21 is connected via the open valve 23 and the changeover valve 20 is switched to collect floating foreign matter (for example, fine plastics or fibers that are difficult to ferment) on the liquid surface F of the fermenter 1. It can be discharged to the foreign matter tank 21 via the tank 10. In this case, by connecting the top space 13 in the liquid storage tank 10 and the upper space 4 in the fermentation tank 5 through the pressure equalizing path 18, the liquid level in the liquid storage tank 10 is adjusted to the liquid level in the fermentation tank 1. It can be matched with level L. The foreign matter discharge path 24 can have an appropriate tube diameter so that various foreign matters can be discharged, and preferably has a sufficiently large tube diameter that is not easily blocked by foreign matter. During normal processing operation, the on-off valve 23 is closed and the circulation pump 6 and the dispersion discharger 7 are connected by the switching valve 20. The opening / closing valve 23 is opened as necessary, and the switching pump 20 connects the circulation pump 6 and the foreign matter tank 21 so that the floating foreign matter on the liquid surface F of the fermenter 1 can be circulated in the liquid storage tank 10, the outflow passage 17, and the circulation. It is conveyed to the foreign matter tank 21 through the pump upstream side 5 a of the path 5, the circulation pump 6, the pump downstream side 5 b of the circulation path 5, the switching valve 20 and the foreign matter conveyance path 22.

It is explanatory drawing of one Example of this invention. It is explanatory drawing of the other Example of this invention. It is explanatory drawing of the several discharge outlet of the dispersion | distribution arrangement | positioning used by this invention. It is explanatory drawing of the fermenter injection | throwing-in method of the conventional organic substance containing liquid. It is explanatory drawing of the stirring method of the organic substance containing liquid in a fermenter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fermenter 2 ... Microorganism carrier 3 ... Outlet 4 ... Upper space 5 ... Circulation path 5a ... Pump upstream side
5b ... Downstream side of pump 6 ... Circulating pump 7 ... Dispersion discharger 8 ... Discharge port 9 ... Top wall 10 ... Liquid reservoir tank
11 ... Inlet 12 ... Outlet
13… Top space 14… Inlet
15 ... Retract 16 ... Control valve
17 ... Outflow 18 ... Pressure equalization
20 ... Switch valve 21 ... Foreign matter tank
22 ... Foreign matter transfer path 23 ... Open / close valve
24 ... Foreign matter discharge passage 26 ... Additive tank
27 ... Additive transport route 28 ... Additive supply port
30 ... Storage tank 31 ... Supply pump
32 ... Supply path 33 ... Inlet
35 ... Heat exchanger 36 ... Desulfurizer
45 ... Stirrer 46 ... Stirring blade F ... Liquid level G ... Biogas H ... High temperature fluid L ... Water level S ... Organic substance-containing liquid W ... Treated water

Claims (8)

A fermenter that holds decomposed microorganisms and decomposes the organic matter-containing liquid by contact with the microorganisms is provided with an external circulation path with a pump that draws the organic matter-containing liquid in the tank from the bottom and returns it to a plurality of outlets that are dispersedly arranged at the top. Hold the liquid tank where the bottom is connected to the circulation path at the liquid level of the tank and the top space communicates with the upper space in the fermentation tank, and the liquid containing organic matter to be treated is taken into the top space of the liquid tank. A fermenter charging method of an organic substance-containing liquid, which is supplied to the circulation path from the bottom of the storage tank and is charged into the fermentation tank from the plurality of discharge ports together with the circulation liquid of the circulation path. The method according to claim 1 , wherein a decomposition treatment additive is supplied to the liquid storage tank, and the organic matter-containing liquid is added to the fermenter along with the additive to be treated together with the additive. 3. The method according to claim 1 or 2 , wherein the top and bottom of the liquid storage tank are connected to the pump downstream side and upstream side of the circulation path, and the organic substance-containing liquid to be treated is drawn into the liquid storage tank from the pump downstream side of the circulation path. A fermenter charging method of an organic substance-containing liquid, which is mixed with a circulating liquid and supplied to the upstream side of the circulation path pump. In the method according to claim 3 , the fermenter and the liquid reservoir tank are connected by a foreign matter discharge passage with an on-off valve having a liquid level, and a foreign matter tank is connected to the downstream side of the circulation passage via a switching valve. A method for charging an organic substance-containing liquid into a fermenter, in which floating foreign matter on a liquid surface in a fermenter is discharged to a foreign matter tank via a liquid storage tank by opening the on-off valve and switching the switching valve. Fermenter that retains decomposed microorganisms and decomposes organic matter-containing liquid by contact with microorganisms, external circulation path with a pump that returns the organic matter-containing liquid in the fermentor from the bottom to a plurality of outlets dispersed and arranged at the top, fermenter A liquid tank that is maintained at a liquid level and has a bottom connected to the circulation path, a pressure equalizing path that communicates the top of the liquid tank and the upper space in the fermenter, and the top of the liquid tank A processing apparatus for an organic substance-containing liquid, comprising a connected supply path for an organic substance-containing liquid to be processed. 6. The apparatus for treating an organic substance-containing liquid according to claim 5 , wherein a supply port for a decomposition treatment additive is provided in the liquid storage tank. 7. The apparatus according to claim 5 or 6 , further comprising an outflow path connecting the bottom of the liquid reservoir tank to the upstream side of the pump of the circulation path, and a control valve for drawing the circulating liquid from the pump downstream side of the circulation path to the top of the liquid tank. The processing apparatus of the organic substance containing liquid which provides a drawing path. 8. The apparatus according to claim 7 , wherein a foreign substance tank connected via a switching valve to the downstream side of the pump of the circulation path, and a foreign substance discharge path with an on-off valve for connecting the fermentation tank and the liquid reservoir tank at a liquid level. An organic substance-containing liquid processing apparatus.

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