JP6933525B2 - Organic waste treatment system - Google Patents

Description

The embodiment relates to an organic waste treatment system.

Systems for treating organic waste, including organic matter, are known. Such a system uses ozone to oxidize waste and then anaerobic digestion to generate biogas containing methane and the like.

Japanese Patent No. 4631162 Japanese Patent No. 4507712 Japanese Unexamined Patent Publication No. 2006-212581 Japanese Unexamined Patent Publication No. 2006-305546 Japanese Unexamined Patent Publication No. 2004-58047

However, the above-mentioned system has a problem that the amount of biogas generated is not sufficient.

In order to solve the above-mentioned problems and achieve the object, the organic waste treatment system of the embodiment includes a digestion facility and a solubilization facility. The digestion facility digests the object to be treated, including organic matter, to produce digestive sludge and biogas. The solubilization equipment solubilizes the digested sludge to produce solubilized sludge . The solubilization equipment includes a supply member, a solubilization tank, a circulation path, a pressurizing member, a gas generator, and a crusher. The supply member supplies the digested sludge to the solubilization equipment. The solubilization tank stores the digested sludge and the solubilized sludge . In the circulation route, the digested sludge and the solubilized sludge stored in the solubilized tank are solubilized and returned to the solubilized tank again. In the circulation path, a pressurizing member that pressurizes the digested sludge and the solubilized sludge stored in the solubilization tank and flows them through the circulation path, ozone supplied from an ozone generating portion, and the pressurization. A crusher that mixes the digested sludge and the solubilized sludge that are pressurized by the member and flows through the circulation path, and crushes the digested sludge and the solid matter contained in the solubilized sludge by pressure fluctuation, and the crusher. Dissolution that is located downstream of the vessel and injects the digested sludge containing the ozone and the crushed solid and the solubilized sludge to increase the contact between the ozone and the crushed solid by turbulence. A reaction section and a reaction section are provided.

FIG. 1 is a diagram showing the overall configuration of the organic waste treatment system according to the first embodiment. FIG. 2 is an overall configuration diagram of the experimental device. FIG. 3 is an overall configuration diagram of the organic waste treatment system of the second embodiment. FIG. 4 is an overall configuration diagram of the organic waste treatment system of the third embodiment.

Similar components are included in the following exemplary embodiments and modifications. Therefore, in the following, similar components are given a common reference numeral, and duplicate explanations are partially omitted. The portion included in the embodiment or the modification can be configured by replacing the corresponding portion of the other embodiment or the modification. Further, the configuration and position of the portion included in the embodiment and the modified example are the same as those of the other embodiments and the modified example unless otherwise specified.

<First Embodiment>
FIG. 1 is a diagram showing the overall configuration of the organic waste treatment system 10 according to the first embodiment.

The organic waste treatment system 10 removes organic matter by producing methane and carbon dioxide from organic waste contained in sewage or the like by anaerobic digestion. The organic waste treatment system 10 recovers and uses biogas containing about 70% of methane produced by anaerobic digestion as energy. For example, the organic waste treatment system 10 converts methane contained in biogas into heat with a gas boiler and uses it for heating the digestion tanks 20 and 22 described later. Further, the organic waste treatment system 10 uses methane contained in biogas for power generation by the gas generator of the power generation facility 90, and the generated power is used in the organic waste treatment system 10. Profit by reducing the amount of electricity purchased or selling electricity.

As shown in FIG. 1, the organic waste treatment system 10 includes a digestion facility 12 and a solubilization facility 14.

The digestion facility 12 anaerobic digests organic waste or sludge containing organic matter to generate biogas containing methane, and discharges the digested sludge from which organic matter has been removed. The digestion facility 12 has a first digestion tank 20 and a second digestion tank 22. Organic waste or sludge is an example of an object to be treated.

The first digestion tank 20 is, for example, the most upstream side of the organic waste treatment system 10 and is provided on the upstream side of the solubilization equipment 14. The first digestion tank 20 contains anaerobic microorganisms inside, and anaerobic digests organic waste supplied from the outside by the anaerobic microorganisms. Anaerobic microorganisms are, for example, hydrolyzing bacteria, acid-producing bacteria, methanogens and the like. For example, the first digestion tank 20 decomposes high molecular weight organic substances such as carbohydrates, proteins, and lipids contained in organic waste into low molecular weight organic substances by hydrolyzing bacteria. Next, the first digestion tank 20 decomposes small molecule organic substances into lower fatty acids such as acetic acid and propionic acid by acid-producing bacteria. The first digestion tank 20 decomposes lower fatty acids into methane and carbon dioxide by methanogens to generate biogas. The first digestion tank 20 sends biogas produced by anaerobic digestion of organic waste to a power generation facility 90 or the like, and solubilizes the sludge after digestion, which is the residue from which some organic substances have been removed. Send to. As shown by the dotted arrow, the first digestion tank 20 may supply a part of the sludge to the second digestion tank 22 instead of the solubilization equipment 14.

The second digestion tank 22 is provided on the downstream side of the solubilization equipment 14. The second digestion tank 22 anaerobicly digests the solubilized sludge sent from the solubilization equipment 14 by the same digestion method as the first digestion tank 20. The second digestion tank 22 sends the biogas produced by anaerobic digestion of the solubilized sludge to the power generation facility 90 and the like, and discharges the remaining digested sludge from which the organic matter has been removed from the sludge to the dehydration facility 92 and the like. ..

The solubilization equipment 14 solubilizes and liquefies the sludge after digestion sent from the digestion equipment 12 and supplies it to the digestion equipment 12. The solubilization equipment 14 includes a supply pump 30, a circulation path 32, a solubilization tank 34, a pressurizing pump 36, a hydrogen peroxide injection device 38, an injection pump 40, an ozone generator 42, and a crusher 44. And a dissolution reaction unit 46 and a discharge pump 48.

The supply pump 30 is an example of a supply member. The supply pump 30 is connected to the first digestion tank 20 and the solubilization tank 34 of the digestion facility 12. The supply pump 30 supplies the sludge from the first digestion tank 20 to the solubilization tank 34 of the solubilization equipment 14.

The circulation path 32 is a sludge path connecting the solubilization tank 34, the pressurizing pump 36, the crusher 44, the dissolution reaction unit 46, and the solubilization tank 34. The circulation path 32 circulates the sludge in the solubilization tank 34 in the order of the pressure pump 36, the crusher 44, and the dissolution reaction unit 46, and returns the sludge to the solubilization tank 34.

The solubilization tank 34 is connected to the first digestion tank 20 and the second digestion tank 22. The solubilization tank 34 temporarily stores the digested sludge sent from the first digestion tank 20 via the supply pump 30. Further, the solubilization tank 34 temporarily stores the solubilized sludge sent from the dissolution reaction unit 46. The solubilization tank 34 sends sludge to the crusher 44 and also sends the solubilized sludge to the second digestion tank 22.

The pressurizing pump 36 is an example of a pressurizing member. The pressurizing pump 36 is on the circulation path 32 and is connected between the solubilization tank 34 and the crusher 44. The pressurizing pump 36 pressurizes the sludge in the solubilization tank 34, flows it through the circulation path 32, and sends it to the crusher 44. The flow rate of sludge by the pressurizing pump 36 is larger than the flow rate of sludge by the supply pump 30. As a result, the pressurizing pump 36 circulates the sludge a plurality of times in the circulation path 32.

The hydrogen peroxide injection device 38 is connected to the circulation path 32 on the upstream side of the crusher 44 via the injection pump 40. The hydrogen peroxide injection device 38 generates hydrogen peroxide for injecting and supplying sludge flowing through the circulation path 32. For example, the hydrogen peroxide injection device 38 supplies a liquid hydrogen peroxide solution containing hydrogen peroxide to sludge. The hydrogen peroxide injection device 38 and the injection pump 40 are examples of hydrogen peroxide supply units.

The injection pump 40 is connected to the hydrogen peroxide injection device 38 and is connected to a circulation path 32 between the downstream side of the pressurizing pump 36 and the upstream side of the crusher 44. The injection pump 40 injects hydrogen peroxide supplied from the hydrogen peroxide injection device 38 into the sludge pressurized by the pressure pump 36 on the upstream side of the crusher 44. For example, the injection pump 40 supplies hydrogen peroxide to sludge at a flow rate of 100 ppm or less.

The ozone generator 42 is an example of a gas generating unit. The ozone generator 42 is connected to the crusher 44. The ozone generator 42 generates ozone, which is a gas mixed with sludge. The ozone generator 42 supplies ozone to the sludge flowing through the crusher 44. For example, the ozone generator 42 preferably supplies ozone to sludge in an addition amount of 450 mg / L or less.

The crusher 44 is provided on the circulation path 32. The crusher 44 is connected to the downstream side of the pressurizing pump 36 and the injection pump 40 and the ozone generator 42. The crusher 44 is connected to the upstream side of the dissolution reaction unit 46. The crusher 44 is, for example, an ejector (also referred to as a pressure fluctuation pipe) which is one of the pumps. The crusher 44 sucks ozone supplied from the ozone generator 42. The crusher 44 mixes ozone with sludge that is pressurized by the pressurizing pump 36 and injected with hydrogen peroxide by the injection pump 40. The crusher 44 crushes the solid matter in the sludge to reduce the molecular weight by the shearing force generated by the pressure fluctuation due to the supply of ozone, and makes the ozone into microbubbles. The crusher 44 sends the sludge mixed with microbubbled ozone to the dissolution reaction unit 46.

The dissolution reaction unit 46 is on the circulation path 32 and is connected to the downstream side of the crusher 44 and the upstream side of the solubilization tank 34. The dissolution reaction unit 46 includes a nozzle 50, a dissolution reaction tank 54, and a turbulent flow member 52. The nozzle 50 is installed in the dissolution reaction tank 54 and is connected to a circulation path 32 extending from the crusher 44. The nozzle 50 injects sludge mixed with ozone sent from the crusher 44 into the dissolution reaction tank 54. The turbulent flow member 52 is installed in the dissolution reaction tank 54. The turbulent flow member 52 disturbs the flow of ozone-mixed sludge injected into the dissolution reaction tank 54. As a result, the turbulent flow member 52 increases the contact between the microbubble-like ozone and the solid matter in the sludge, destroys the cell wall of the organic matter in the sludge mixed with ozone by the oxidizing power of ozone, and inside the cell. Promotes solubilization of carbohydrates and proteins. The dissolution reaction tank 54 internally pressurizes the ozone-mixed sludge. The dissolution reaction tank 54 is connected to the solubilization tank 34. The dissolution reaction tank 54 sends the solubilized sludge to the solubilization tank 34.

The discharge pump 48 is connected to the second digestion tank 22 and the solubilization tank 34 of the digestion facility 12. The discharge pump 48 supplies the solubilized sludge in the solubilization tank 34 to the second digestion tank 22.

Next, the operation of the organic waste treatment system 10 will be described.

The first digestion tank 20 of the digestion facility 12 anaerobic digests organic waste containing organic matter sent from the outside to generate biogas containing methane and digested sludge from which some organic matter has been removed. do. The first digestion tank 20 sends the biogas to the power generation facility 90 and the like, and also sends the digested sludge to the solubilization tank 34 of the solubilization facility 14. The pressurizing pump 36 pressurizes the stored sludge supplied to the solubilization tank 34 and flows it through the circulation path 32. The injection pump 40 injects the hydrogen peroxide supplied from the hydrogen peroxide injection device 38 into the sludge in the circulation path 32 flowing to the crusher 44. The crusher 44 mixes the ozone supplied from the ozone generator 42 with the sludge that has been pressurized and injected with hydrogen peroxide, and melts the ozone-mixed sludge that crushes the solid matter in the sludge into the dissolution reaction unit 46. send. The dissolution reaction unit 46 sends the solubilized sludge to the solubilization tank 34 by increasing the contact between ozone and the solid matter in the sludge. While storing the solubilized sludge, the solubilization tank 34 sends a part of the sludge as solubilized sludge to the second digestion tank 22, and circulates the rest in the solubilization equipment 14. The second digestion tank 22 anaerobic digests the solubilized sludge to produce biogas and digested sludge from which organic matter has been removed from the solubilized sludge. The second digestion tank 22 sends the biogas to the power generation facility 90 and the like, and also sends the digested sludge to the dehydration facility 92 and the like.

Next, an experiment for demonstrating the effect of the solubilization equipment 14 of the organic waste treatment system 10 described above will be described. First, the experimental device 14a used in this experiment will be described. FIG. 2 is an overall configuration diagram of the experimental device 14a. The same reference numerals are given to the configurations of the experimental apparatus 14a similar to the configurations of the solubilization equipment 14 of the organic waste treatment system 10 described above to simplify the description.

As shown in FIG. 2, the experimental device 14a includes a circulation path 32, a solubilization tank 34, a pressurizing pump 36, a hydrogen peroxide injection device 38, an injection pump 40, a crusher 44, and an ozone generator. 42 and a dissolution reaction unit 46 are provided. The dissolution reaction unit 46 includes a nozzle 50, a turbulent flow member 52, and a dissolution reaction tank 54.

<First experiment>
In the first experiment, the effect of ozone in the organic waste treatment system 10 will be described. As shown in Table 1 below, the first experiment was performed under 6 different conditions. Each sample No. of 6 different conditions. Is A-1 to A-6. In the first experiment, the solubilization rate and the gas increase ratio were investigated.

In the experiment for examining the solubilization rate, the sludge in the solubilization tank 34 was circulated in the circulation path 32 by the pressure pump 36. As the sludge in the solubilization tank 34, digested sludge having a loss on ignition (Volatile Solids: VS) of 1.5% at the sewage treatment plant was used.

Sample No. A-1 is for comparison purposes and remains as digestive sludge from a sewage treatment plant that does not supply ozone or the like.

Sample No. A-2 is sludge to which 150 mg / L of oxygen is supplied from the non-discharged ozone generator 42 to which no voltage is applied via the crusher 44. In addition, sample No. Ozone is not supplied to A-1. Sample No. The oxygen injection rate per VS of sludge in A-2 is 0.01 mg-O ₂ / mg-VS.

Sample No. Each of A-3 to A-5 is sludge to which 150 mg / L, 300 mg / L, and 450 mg / L of ozone are supplied from the ozone generator 42 via the crusher 44. Sample No. Ozone injection rate per VS sludge in each of A-3 of the A-5, respectively _{0.01mg-O 3 /mg-VS,0.02mg-O 3 /mg-VS,0.03mg-O 3} / It is mg-VS.

Sample No. A-6 is sludge for which 150 mg / L of ozone is supplied from the ozone generator 42 through an air diffuser tube instead of the crusher 44 for comparison. Sample No. Ozone injection rate per VS sludge in A-6 is _{0.01mg-O 3 / mg-VS} .

In the experimental device 14a, the gas flow rate of ozone or oxygen from the ozone generator 42 and the flow rate of sludge by the pressurizing pump 36 are fixed, and the amount of ozone and oxygen added is the processing time (minutes) for supplying ozone or oxygen. ) Was adjusted.

The ignition loss (Volatile Suspended Solids: VSS) of the suspended solids of the sludge sample after the experiment was analyzed, and the solubilization rate was calculated by the following formula (1).
Solubilization rate [%] = (1-α1 / α2) × 100 ・ ・ ・ (1)
α1: VSS [%] of the sludge sample after treatment
α2: VSS [%] of untreated sludge (Sample No. A-1)

Next, a digestion experiment was carried out to obtain the amount of gas generated. The above-mentioned sample No. The sludges A-1 to A-6 and the seed sludge containing methane-producing bacteria were placed in a 200 mL vial at a ratio of 1: 1 and the gas phase part was replaced with nitrogen to enclose the vial. The amount of gas generated from a vial filled with sludge and set in a constant temperature shaker at 37 ° C. was measured for more than 30 days. Sample No. The gas increase ratio, which is the ratio of the measured gas generation amount per VS amount of each sludge sample to the gas generation amount per VS amount of the untreated sludge of A-1, is calculated by the following equations (2) and (3). Calculated.
Gas generation amount [L / g-VS] = β1 × 10 ^-3 / (β2 × β3 × 10 ^-2 ) ・ ・ ・ (2)
β1: Measured value of gas generation amount of each sample [mL]
β2: Sludge amount of each sample [mL]
β3: VS [%] of each sample
Gas increase ratio = γ1 / γ2 ・ ・ ・ (3)
γ1: Gas generation amount of each sample calculated by the formula (2) [L / g-VS]
γ2: Gas generation amount of untreated sludge (sample No. A-1) calculated by the formula (2) [L / g-VS]

The experimental results of the solubilization rate and the gas increase ratio of the first experiment are shown in Table 1 below.

Sample No. By comparing A-1 and A-2, even when oxygen was supplied without supplying ozone, the experimental device 14a having the crusher 44 in FIG. 2 increased the solubilization rate by 8.2 points and increased the gas. It was found that the ratio could be increased by 0.4 points. This is because the crusher 44 of the experimental device 14a functions as a pressure fluctuation conduit of the ejector when the sludge is mixed with a gas (oxygen in this case), and the shearing force generated by the pressure fluctuation causes the sludge to be solid. It is considered that this is the effect of crushing and reducing the molecular weight.

Sample No. By comparing A-2 to A-5, it was found that the solubilization rate of sludge and the gas increase ratio increase as the amount of supplied gas (here, oxygen or ozone) increases.

Sample No. with the same amount of ozone added. By comparing A-3 and A-6, the solubilization rate of sludge increased by 2.8 points and the gas increase ratio increased by 0.1 points. This is the sample No. The crusher 44 used for supplying ozone of A-3 was sample No. It is considered that this is because the solubilization performance was superior to that of the air diffuser used for supplying ozone of A-6 and it contributed to the increase in the amount of gas generated.

From the experimental results of the first experiment, the experimental apparatus 14a supplied ozone to microbubbles to pulverize the solid matter contained in the sludge, so that the solubilization rate was determined by the addition amount of ozone of 450 mg / L or less. It was found that the gas increase ratio can be improved. Sample No. in Table 1 In the tests A-3 to A-5, ozone exhaust was not detected in the exhaust gas, and the ozone charged was used efficiently. From the results of the first experiment, it was found that the organic waste treatment system 10 can be constructed without the ozone exhaust device by adopting the configuration of the first embodiment.

<Second experiment>
In the second experiment, the effect of hydrogen peroxide on the organic waste treatment system 10 will be described. As shown in Table 2 below, the second experiment was performed under 5 different conditions. Each sample No. of 5 different conditions. Is B-1 to B-5. In the second experiment, the solubilization rate and the gas increase ratio were investigated.

Sample No. B-1 is sample No. It is the same as A-1.

Sample No. B-2 to B-5 are sample Nos. The sludge is prepared by adding 50 ppm, 50 ppm, 100 ppm, and 150 ppm of hydrogen peroxide to each of A-2 to A-5, respectively.

Sample No. was prepared in the same manner as in the first experiment. The solubilization rate and gas increase ratio of B-1 to B-5 were calculated. The experimental results of the solubilization rate and the gas increase ratio of the second experiment are shown in Table 2 below.

Sample No. B-2 is sample No. Compared with A-2, the solubilization rate increased by 5.9 points and the gas increase ratio increased by 0.1 points. Sample No. B-3 is sample No. Compared with A-3, the solubilization rate increased by 8.4 points and the gas increase ratio increased by 0.3 points. Sample No. B-4 is sample No. Compared with A-4, the solubilization rate increased by 9.5 points and the gas increase ratio increased by 0.3 points. Sample No. B-5 is sample No. Compared with A-5, the solubilization rate increased by 9.5 points and the gas increase ratio decreased by 0.1 points. Sample No. It is probable that the reason why the gas increase ratio of B-5 decreased was that ozone was excessively oxidized and a part of the organic matter was oxidatively decomposed into gas.

Therefore, sample No. From the results of B-2, it was found that the addition of hydrogen peroxide alone contributed little to the solubilization of sludge and the improvement of the gas increase ratio.

Sample No. From the results of B-3 to B-5, it was found that hydrogen peroxide can be added together with ozone to significantly improve the solubilization rate of sludge and the gas increase ratio.

Sample No. From the results of B-5, it was found that when the amount of ozone added was 450 mg / L and the amount of hydrogen peroxide added was 150 ppm, sludge was over-decomposed and the gas increase ratio was reduced.

From these results, it was found that in order to promote the gas increase ratio, it is preferable that ozone and hydrogen peroxide are added together and the amount of hydrogen peroxide added is 100 ppm or less. More preferably, the amount of ozone added is 0.02 _{mg-O 3} / mg-VS (= 300 mg / L) or less, and the amount of hydrogen peroxide added is 100 ppm or less. Further, the sample No. having almost the same gas increase ratio. From the results of A-4 and B-3 (gas increase ratio: 1.9), it can be obtained that adding 50 ppm of hydrogen peroxide solution gives the same gas increase ratio as adding 150 mg / L of ozone. all right. Sample No. with almost the same gas increase ratio. From the results of A-5 and B-4 (gas increase ratio: 2.1 or 2.2), adding 100 ppm of hydrogen peroxide solution gives the same gas increase ratio as adding 150 mg / L of ozone. It turned out to be obtained.

From the experimental results of the second experiment, when hydrogen peroxide is supplied to the sludge and then ozone is supplied while being microbubbled to crush the solid matter contained in the sludge, the experimental apparatus 14a is at least 300 mg / L or less. It was found that the solubilization rate and the gas increase ratio can be improved by adding ozone and adding hydrogen peroxide of 100 ppm or less.

As described above, in the organic waste treatment system 10 of the first embodiment, the crusher 44 mixes sludge and ozone while crushing the solid matter in the sludge by the pressure fluctuation generated by the supply of ozone. As a result, the organic waste treatment system 10 can increase the amount of biogas generated by increasing the contact between the micronized solid matter and ozone and improving the solubilization rate.

In the organic waste treatment system 10, the flow rate of sludge circulated by the pressurizing pump 36 is larger than the flow rate of sludge supplied by the supply pump 30. Therefore, since the organic waste treatment system 10 can circulate the sludge a plurality of times in the circulation path 32, the solubilization rate can be further improved and the amount of biogas generated can be increased.

In the organic waste treatment system 10, the ozone generator 42 supplies ozone to sludge. As a result, the organic waste treatment system 10 can improve the solubilization rate and increase the amount of biogas generated as compared with the case where oxygen or the like is supplied.

In the organic waste treatment system 10, the hydrogen peroxide injection device 38 and the injection pump 40 supply hydrogen peroxide to the sludge. As a result, the organic waste treatment system 10 can increase the amount of biogas generated while reducing the supply amount of ozone, which is expensive in terms of manufacturing cost, operating cost, material cost, and the like.

In the organic waste treatment system 10, the hydrogen peroxide injection device 38 and the injection pump 40 supply hydrogen peroxide to sludge in an addition amount of 100 ppm or less. As a result, the organic waste treatment system 10 can reduce the supply amount of expensive ozone, suppress the addition of excess hydrogen peroxide, and increase the amount of biogas generated.

In the organic waste treatment system 10, the hydrogen peroxide injection device 38 and the injection pump 40 are connected to the upstream side of the crusher 44. As a result, the crusher 44 promotes not only the mixing of sludge and ozone but also the mixing of sludge and hydrogen peroxide, so that the organic waste treatment system 10 determines the solubilization rate and the amount of biogas generated. It can be improved further.

<Second Embodiment>
FIG. 3 is an overall configuration diagram of the organic waste treatment system 110 of the second embodiment. As shown in FIG. 3, the organic waste treatment system 110 of the second embodiment includes a digestion facility 112 and a solubilization facility 14.

The digestion facility 112 has a digestion tank 122.

The digestion tank 122 is connected to the downstream side of the solubilization tank 34. Sludge solubilized by the solubilization tank 34 is sent to the digestion tank 122. The digestion tank 122 anaerobic digests the solubilized sludge to produce biogas and digested sludge from which organic matter has been removed from the solubilized sludge. The digestion tank 122 supplies biogas to the power generation facility 90 and the like, and sends the sludge after digestion to the dehydration facility 92 and the like.

The solubilization equipment 14 solubilizes organic waste that has not been anaerobic digested and supplies it to the digestion equipment 112. Organic waste is directly sent from the outside to the solubilization tank 34. The solubilization tank 34 stores sludge in which organic waste containing organic matter and not anaerobic digested and sludge sent from the dissolution reaction unit 46 are mixed. The pressurizing pump 36 sends a part of the sludge mixed and stored in the solubilization tank 34 to the crusher 44, and the discharge pump 48 sends the remaining sludge to the digestion tank 122.

Also in the second embodiment, the addition amount of ozone and the addition amount of hydrogen peroxide are the same as those in the first embodiment.

Also in the second embodiment, the same effect as that of the first embodiment can be obtained.

<Third Embodiment>
FIG. 4 is an overall configuration diagram of the organic waste treatment system 210 of the third embodiment. As shown in FIG. 4, the organic waste treatment system 210 of the third embodiment has a digestion facility 212 and a solubilization facility 14.

The digestion equipment 212 has a digestion tank 220.

The digestion tank 220 is connected to the solubilization tank 34. The digestion tank 220 anaerobic digests the organic waste supplied from the outside and the solubilized sludge sent from the solubilization tank 34 to produce biogas and digestive sludge from which organic substances have been removed. The digestion tank 220 sends the generated biogas to the power generation facility 90 and the like. The digestion tank 220 sends a part of the sludge after digestion to the solubilization tank 34, and sends the remaining sludge to the dehydration equipment 92 and the like.

In the solubilization tank 34 of the solubilization equipment 14 of the third embodiment, sludge in which the sludge after digestion sent from the digestion tank 220 and the sludge sent from the dissolution reaction unit 46 are mixed is stored. The solubilization tank 34 sends a part of the mixed and solubilized sludge to the crusher 44 by the pressurizing pump 36, and sends the remaining sludge to the digestion tank 220 by the discharge pump 48.

Also in the third embodiment, the addition amount of ozone and the addition amount of hydrogen peroxide are the same as those in the first embodiment.

Also in the third embodiment, the same effect as that of the first embodiment can be obtained.

The arrangement, function, number, numerical value, and the like of each configuration of each of the above-described embodiments may be changed as appropriate. Each of the above embodiments may be combined.

For example, the order of each configuration on the circulation path 32 in each of the above embodiments may be changed as appropriate.

In the above-described embodiment, the ozone generator 42 that generates ozone and supplies it to sludge is given as an example of the gas generating unit, but the gas generating unit is a device that supplies gas such as oxygen other than ozone to sludge. You may.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10, 110, 210 ... Organic waste treatment system, 12, 112, 212 ... Digestion equipment, 14 ... Solubilization equipment, 30 ... Supply pump (supply member), 32 ... Circulation route, 34 ... Solubilization tank, 36 ... Pressurized pump (pressurizing member), 38 ... hydrogen peroxide injection device (hydrogen peroxide supply section), 40 ... injection pump (hydrogen peroxide supply section), 42 ... ozone generator (gas generator), 44 ... crushing vessel.

Claims (10)

Digestive equipment that digests processing objects containing organic matter to generate digestive sludge and biogas,
A solubilization facility that solubilizes the digested sludge to produce solubilized sludge,
With
The solubilization equipment
A supply member that supplies the digested sludge to the solubilization facility,
A solubilization tank for storing the digested sludge and the solubilized sludge,
It has a digestive sludge stored in the solubilization tank and a circulation route for solubilizing the solubilized sludge and returning it to the solubilization tank again.
In the circulation path,
A pressure member that pressurizes the digested sludge and the solubilized sludge stored in the solubilization tank and flows them through the circulation path.
The ozone supplied from the ozone generating unit, the digested sludge pressurized by the pressurizing member and flowing through the circulation path, and the solubilized sludge are mixed, and the digested sludge and the solubilized sludge are formed by pressure fluctuation. A crusher that crushes the solids contained in it,
The digested sludge containing the ozone and the crushed solid matter and the solubilized sludge are injected and input downstream of the crusher, and the contact between the ozone and the crushed solid matter is increased by turbulence. An organic waste treatment system provided with a dissolution reaction section. Wherein the circulation path, the hydrogen peroxide supply unit for supplying hydrogen peroxide to the solubilized sludge and the digested sludge is flow in the circulation path by the pressure member is further provided, according to claim 1 organic waste treatment system according to. In the circulation path, hydrogen peroxide is supplied between the pressurizing member and the crusher to the digested sludge and the solubilized sludge flowed into the circulation path by the pressurizing member. The organic waste treatment system according to claim 1, further provided with a hydrogen supply unit. Hydrogen peroxide supplied by the hydrogen peroxide supply unit is 100ppm or less, organic waste treatment system according to claim 2 or claim 3. The digestion facility has a single digestion tank, and the digestion sludge and the biogas are digested in the digestion tank by digesting the treatment target containing the organic substance and the solubilized sludge returned from the solubilization facility. The organic waste treatment system according to claim 1. The digestion facility has a first digestion tank and a second digestion tank, and the first digestion tank digests the treatment target including the organic substance to generate the digestion sludge and the biogas. The organic waste treatment system according to claim 1, wherein in the second digestion tank, the solubilized sludge supplied from the solubilization facility is digested to generate the digested sludge and the biogas. The organic waste treatment system according to claim 1, wherein the amount of ozone supplied from the ozone generating unit is 450 mg / L or less. The organic waste treatment system according to claim 7, wherein the injection rate of ozone supplied from the ozone generating unit to the ignition loss of sludge is 0.03 or less. The organic waste treatment system according to claim 4, wherein the amount of ozone supplied from the ozone generating unit is 300 mg / L or less. The organic waste treatment system according to claim 9, wherein the injection rate for the ignition loss of ozone supplied from the ozone generating unit is 0.02 or less.

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