Organic wastewater treatment apparatus and organic wastewater treatment method
AssigneeMitsubishi Kakoki Kaisha, Ltd.
InventorsTaira HANAOKA, Tsuyoshi MAEDA
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Abstract
An organic wastewater treatment apparatus includes: a first treatment device configured to perform methane fermentation on organic wastewater containing a floating substance, an organic substance, and a nitrogen component under an anaerobic condition and perform membrane filtration to obtain membrane-filtered water; a second treatment device provided downstream of the first treatment device and including a vacuum degassing device that removes and recovers a part of dissolved methane in the membrane-filtered water; and a third treatment device provided downstream of the second treatment device and configured to perform post-treatment.
Claims19
An organic wastewater treatment apparatus comprising:
- a first treatment device configured to perform methane fermentation on organic wastewater containing a floating substance, an organic substance, and a nitrogen component under an anaerobic condition and perform membrane filtration to obtain membrane-filtered water;
- a second treatment device provided downstream of the first treatment device and including a vacuum degassing device that removes and recovers a part of dissolved methane in the membrane-filtered water;
- and
- a third treatment device provided downstream of the second treatment device and configured to perform post-treatment, wherein
- the vacuum degassing device includes a closing part that closes an upper gas phase section of a second treatment tank to bring the second treatment tank into a sealed state, a degassing outer cylinder erected in a vertical axis direction on an upper side of the closing part, an inner cylinder having one end disposed in the membrane-filtered water inside the degassing outer cylinder and the other end disposed in an upper gas reservoir inside the degassing outer cylinder, and a methane recovery line connected to a top portion of the degassing outer cylinder and having a vacuum pump interposed therein.
(canceled)
An organic wastewater treatment method, comprising:
- a first treatment step of performing methane fermentation on organic wastewater containing a floating substance, an organic substance, and a nitrogen component under an anaerobic condition and performing membrane filtration to obtain membrane-filtered water;
- a second treatment step including a vacuum degassing device that removes and recovers a part of dissolved methane in the membrane-filtered water obtained in the first treatment step;
- and
- a third treatment step of performing post-treatment on treated water obtained in the second treatment step, wherein
- in the second treatment step,
- the vacuum degassing device includes a closing part that closes an upper portion of a second treatment tank to bring the second treatment tank into a sealed state, a degassing outer cylinder erected in a vertical axis direction on an upper side of the closing part, an inner cylinder having one end disposed in the membrane-filtered water inside the degassing outer cylinder and the other end disposed in an upper gas reservoir inside the degassing outer cylinder, and a methane recovery line connected to a top portion of the degassing outer cylinder and having a vacuum pump interposed therein, and recovers the dissolved methane in the membrane-filtered water at a predetermined vacuum degree.
(canceled)
Dependencies are inferred from the claim text.