Waste treatment system and waste treatment method

Patent metadata

Field	Value
Publication number	US-12410085-B2
Application number	US-202118027486-A
Country	US
Kind code	B2
Filing date	Sep 21, 2021
Priority date	Sep 28, 2020
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A waste treatment system, includes: at least one reformer for hydrolyzing waste; a microbial reactor for microbially degrading a reformed material containing at least a solid of the waste hydrolyzed by the at least one reformer; a microbial reaction detection device for detecting a state of degradation of the reformed material in the microbial reactor; and an adjustment device for adjusting amount and timing of supply of the reformed material to the microbial reactor, based on a detected value of the microbial reaction detection device.

First claim

The invention claimed is:

1. A waste treatment system, comprising:
at least one reformer for hydrolyzing waste;
a microbial reactor for microbially degrading a reformed material containing at least a solid of the waste hydrolyzed by the at least one reformer;
a microbial reaction detection device for detecting a state of degradation of the reformed material in the microbial reactor; and
an adjustment device for adjusting amount and timing of supply of the reformed material to the microbial reactor, based on a detected value of the microbial reaction detection device,
wherein the adjustment device includes a storage unit that stores a supply model created based on a first detected value detected in past by the microbial reaction detection device, reformed material information including the amount and timing of supply of the reformed material to the microbial reactor based on the first detected value, and state information including the state of degradation of the reformed material in the microbial reactor, and
wherein the adjustment device is configured to calculate the amount and timing of supply of the reformed material to the microbial reactor by inputting a second detected value detected by the microbial reaction detection device into the supply model.

2. The waste treatment system according to claim 1 ,
wherein the microbial reaction detection device includes:
a collecting device for collecting part of the reformed material in the microbial reactor as a detection sample;
a solid-liquid separation device for separating the detection sample into a solid component and a liquid component;
a dilution device for diluting the liquid component separated by the solid-liquid separation device; and
a concentration measurement device for measuring concentration of a diluted liquid which is the liquid component diluted by the dilution device.

3. The waste treatment system according to claim 2 ,
wherein a measured value of the concentration measurement device includes at least one of concentration of volatile fatty acids or concentration of ammonia contained in the diluted liquid.

4. The waste treatment system according to claim 1 , further comprising:
a reforming state detection device for detecting a state of hydrolysis of the waste in the reformer; and
a hydrolysis condition adjustment device for adjusting a hydrolysis condition of the waste by the reformer, based on the state of hydrolysis of the waste in the reformer detected by the reforming state detection device.

5. The waste treatment system according to claim 1 ,
wherein the reformed material supplied to the microbial reactor includes a readily degradable material that can be microbially degraded within a predetermined time in the microbial reactor, and
wherein the adjustment device is configured to adjust supply amount of the readily degradable material supplied to the microbial reactor and timing of supply of the readily degradable material to the microbial reactor, based on a detected value of the microbial reaction detection device.

6. The waste treatment system according to claim 1 , further comprising a separation device, disposed between the at least one reformer and the microbial reactor, for separating a reaction-unsuitable substance that is unsuitable for microbial degradation in the microbial reactor from the reformed material.

7. The waste treatment system according to claim 6 ,
wherein the reformed material supplied to the microbial reactor includes a readily degradable material that can be microbially degraded within a predetermined time in the microbial reactor, and a persistent material that takes a longer time to be microbially degraded than the readily degradable material, and
wherein the separation device is configured to separate the reformed material into the readily degradable material and the persistent material.

8. The waste treatment system according to claim 1 ,
wherein the reformed material supplied to the microbial reactor includes a readily degradable material that can be microbially degraded within a predetermined time in the microbial reactor, and
wherein the waste treatment system further comprises:
a readily degradable material tank for storing the readily degradable material; and
a readily degradable material state detection device for detecting a state of the readily degradable material in the readily degradable material tank.

9. The waste treatment system according to claim 8 ,
wherein the readily degradable material state detection device is configured to detect at least one of turbidity or sugar content of the readily degradable material in the readily degradable material tank, and
wherein the waste treatment system further comprises a cellulase supply device for supplying cellulase to the readily degradable material tank, based on the at least one of turbidity or sugar content of the readily degradable material in the readily degradable material tank detected by the readily degradable material state detection device.

10. The waste treatment system according to claim 1 ,
wherein the supply model is created by machine-learning teacher data in which the first detected value, the reformed material information, and the state information are associated with each other.

11. The waste treatment system according to claim 1 ,
wherein the reformed material supplied to the microbial reactor includes a readily degradable material that can be microbially degraded within a predetermined time in the microbial reactor,
wherein the waste treatment system further comprises at least one tank, disposed between the at least one reformer and the microbial reactor, for storing the reformed material,
wherein the supply model is created based on:
reformer information including at least one of torque for stirring contents of the reformer or amount of the readily degradable material contained in the reformer;
tank information including at least one of concentration of volatile fatty acids, concentration of an inhibitor, concentration of ammonia contained in contents of the at least one tank, or pH of the contents of the at least one tank;
the first detected value detected in past by the microbial reaction detection device, the first detected value including at least one of concentration of volatile fatty acids, concentration of an inhibitor, concentration of ammonia contained in contents of the microbial reactor, pH of the contents of the microbial reactor, or torque for stirring the contents of the microbial reactor;
the reformed material information; and
the state information, and

wherein the adjustment device is configured to calculate the amount and timing of supply of the reformed material to the microbial reactor by inputting the first detected value, the reformer information, and the tank information into the supply model.

12. The waste treatment system according to claim 1 , further comprising at least one tank, disposed between the at least one reformer and the microbial reactor, for storing the reformed material,
wherein the supply model is created based on:
reformer information including at least one of concentration of volatile fatty acids, concentration of an inhibitor, concentration of ammonia contained in contents of the reformer, or pH of the contents of the reformer;
tank information including at least one of concentration of volatile fatty acids, concentration of an inhibitor, concentration of ammonia contained in contents of the at least one tank, or pH of the contents of the at least one tank;
the first detected value detected in past by the microbial reaction detection device, the first detected value including at least one of concentration

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Noma Akira
• Kawai Kazuhiro
• Fujikawa Keiji
• Okino Susumu
• Okamoto Shinichi
• Nakamura Shinji
• Shizukuishi Kouetsu
• Ukai Nobuyuki
• Nakajima Yuuji
• Nakagawa Keiichi
• Adachi Haruka
• Ike Takashi
• Nakagawa Yosuke

Classifications

• Y02E50/30

  Fuel from waste, e.g. synthetic alcohol or diesel · CPC title

• B09B3/45 Primary

  Steam treatment, e.g. supercritical water gasification or oxidation · CPC title

• C02F11/18

  by thermal conditioning (by pyrolysis C02F11/10) · CPC title

• C02F3/006

  Regulation methods for biological treatment · CPC title

• B09B3/65

  Anaerobic treatment · CPC title