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US 4,071,445 AGranted
Method and apparatus for treating waste water on ships
AssigneesDaicel Corporation, Katayama Chemical Works Co., Ltd.
InventorsSakae Katayama, Sadaoki Kanada, Michitake Kamata, Yasuhiro Sakaguchi, Katsumi Kojima
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Abstract
The present invention relates to a method and apparatus for treating waste water on ships, and more particularly to a method and apparatus for treating waste water on ships in a closed system.
Claims11
A method of treating waste water on a ship comprising the steps of passing waste water through a coarse mesh filter and a crushing means;
- causing the filtered waste water to flow upward;
- passing the waste water through a plurality of downwardly slanting open cellular plate-like members projecting alternately from a pair of opposed walls defining a passage for the upward flow of the waste water, with a small space provided between the free end of each of the plate-like members and the wall opposed thereto, while causing large suspended solids to be separated from the waste water and accumulated in a concentrated state beneath each of the plate-like members by flotation with bubbles generated in the interior of each of the plate-like members to thereby reduce suspended solids in the waste water to below 1,000 ppm and clarifying the resulting treated water by passing the treated water through a semipermeable membrane.
An apparatus for treating waste water on a ship comprising:
- i. means for feeding the waste water,
- ii. means for removing relatively large solids from the waste water,
- iii. at least one liquid-solid separation column of the flotation type having a plurality of downwardly slanting bubble generating plates projecting alternately from opposed inner walls of the column, with a small space formed between the free end of each of the plates and the inner wall opposed thereto, each of the bubble generating plates including an open-cellular plate-like member and a pressurized gas distributing channel formed within the plate-like member and extending substantially in parallel to the plane of the member, the liquid-solid separation column having a waste water inlet at its bottom portion and outlet at its upper portion,
- iv. means for supplying a pressurized gas to the distributing channel, and
- v. a treating system incorporating a semipermeable membrane and a high-pressure pump.
2 more elements
Dependencies are inferred from the claim text.