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US 2010/0248335 A1Published application
Method and apparatus for treatment of organic waste
OwnerToshihiro Komatsu, Tomoko Matsuzaki +1inventors
InventorsToshihiro Komatsu, Tomoko Matsuzaki, Shin-ichiro Wakahara
Life of this patent
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Abstract
The pH condition in a methane fermentation tank is adjusted in a predetermined range equal to or less than the intended pH condition causing no scale formation, while being maintained in a predetermined range approximate to an optimized pH condition suitable for methane fermentation, and thereby the formation of inorganic scales and the like is suppressed.
Claims9
A method for treatment of organic waste, comprising:
- circulating a digestion liquid between a methane fermentation tank having raw material organic waste containing an inorganic scale forming substance flowing thereinto and a membrane separation tank having a membrane separation apparatus submerged therein;
- and
- adding a pH adjusting agent to the digestion liquid in the membrane separation tank or to the digestion liquid flowing from the methane fermentation tank into the membrane separation tank,
- thereby adjusting a pH condition in the membrane separation tank in a predetermined range equal to or less than an intended pH condition causing no scale formation, while maintaining a pH condition in the methane fermentation tank in a predetermined range approximate to an optimized pH condition suitable for methane fermentation.
1 more element
A method for treatment of organic waste, comprising:
- circulating a digestion liquid between a methane fermentation tank having raw material organic waste containing an inorganic scale forming substance flowing thereinto and a membrane separation tank having a membrane separation apparatus submerged therein;
- separating a CO2-rich gas from biogas generated in the methane fermentation tank;
- and
- blowing the CO2-rich gas into the digestion liquid in the membrane separation tank or into the digestion liquid flowing from the methane fermentation tank into the membrane separation tank to dissolve CO2,
- thereby adjusting a pH condition in the membrane separation tank in a predetermined range equal to or less than an intended pH condition causing no scale formation, while maintaining a pH condition in the methane fermentation tank in a predetermined range approximate to an optimized pH condition suitable for methane fermentation.
2 more elements
A method for treatment of organic waste, comprising:
- drawing a digestion liquid from a methane fermentation tank having raw material organic waste containing an inorganic scale forming substance flowing thereinto;
- concentrating the digestion liquid by a pressure type membrane separation apparatus to separate the digestion liquid into a separated liquid and a concentrated sludge;
- drawing the separated liquid in the pressure type membrane separation apparatus therefrom;
- returning the concentrated sludge in the pressure type membrane separation apparatus to the methane fermentation tank;
- and
- adding a pH adjusting agent to the digestion liquid supplied from the methane fermentation tank to the pressure type membrane separation apparatus,
- thereby adjusting a pH condition in the pressure type membrane separation apparatus in a predetermined range equal to or less than an intended pH condition causing no scale formation, while maintaining a pH condition in the methane fermentation tank in a predetermined range approximate to an optimized pH condition suitable for methane fermentation.
4 more elements
An apparatus for treatment of organic waste, comprising:
- a methane fermentation tank having raw material organic waste containing an inorganic scale forming substance flowing thereinto;
- a membrane separation tank having a digestion liquid circulated between the methane fermentation tank and the membrane separation tank;
- a membrane separation apparatus submerged in the membrane separation tank;
- a pH adjusting agent adding unit for adding a pH adjusting agent to the digestion liquid in the membrane separation tank or to the digestion liquid flowing from the methane fermentation tank into the membrane separation tank;
- a pH meter for measuring a pH of the digestion liquid in the membrane separation tank;
- and
- a controller for controlling an amount of the pH adjusting agent added by the pH adjusting agent adding unit, using a measured value of the pH meter,
- wherein by adjustment of the amount of the pH adjusting agent by the controller, a pH condition in the membrane separation tank is adjusted in a predetermined range equal to or less than an intended pH condition causing no scale formation, while a pH condition in the methane fermentation tank is maintained in a predetermined range approximate to an optimized pH condition suitable for methane fermentation.
5 more elements
An apparatus for treatment of organic waste, comprising:
- a methane fermentation tank having raw material organic waste containing an inorganic scale forming substance flowing thereinto;
- a membrane separation tank having a digestion liquid circulated between the methane fermentation tank and the membrane separation tank;
- a membrane separation apparatus submerged in the membrane separation tank;
- a CO2 concentrating unit for separating a CO2-rich gas from biogas generated in the methane fermentation tank and blowing the CO2-rich gas into the digestion liquid in the membrane separation tank or into the digestion liquid flowing from the methane fermentation tank into the membrane separation tank;
- a pH meter for measuring a pH of the digestion liquid in the membrane separation tank;
- and
- a controller for controlling an amount of the CO2-rich gas blown by the CO2 concentrating unit, using a measured value of the pH meter,
- wherein by adjustment of the amount of the CO2-rich gas by the controller, a pH condition in the membrane separation tank is adjusted in a predetermined range equal to or less than an intended pH condition causing no scale formation, while a pH condition in the methane fermentation tank is maintained in a predetermined range approximate to an optimized pH condition suitable for methane fermentation.
5 more elements
An apparatus for treatment of organic waste, comprising:
- a methane fermentation tank having raw material organic waste containing an inorganic scale forming substance flowing thereinto;
- a pressure type membrane separation apparatus for concentrating a digestion liquid transferred from the methane fermentation tank to separate the digestion liquid into a separated liquid and concentrated sludge, removing the separated liquid therefrom, and returning the concentrated sludge to the methane fermentation tank;
- a pH adjusting agent adding unit for adding a pH adjusting agent to the digestion liquid supplied from the methane fermentation tank to the pressure type membrane separation apparatus;
- a pH meter for measuring a pH of the digestion liquid supplied from the methane fermentation tank to the pressure type membrane separation apparatus;
- and
- a controller for controlling an amount of the pH adjusting agent added by the pH adjusting agent adding unit, using a measured value of the pH meter,
- wherein by adjustment of the amount of the pH adjusting agent by the controller, a pH condition in the pressure type membrane separation apparatus is adjusted in a predetermined range equal to or less than an intended pH condition causing no scale formation, while a pH condition in the methane fermentation tank is maintained in a predetermined range approximate to an optimized pH condition suitable for methane fermentation.
4 more elements
Dependencies are inferred from the claim text.