Liquid purification or separation – With gas-liquid surface contact means – With separator
Patent
1990-12-07
1992-08-18
Silverman, Stanley S.
Liquid purification or separation
With gas-liquid surface contact means
With separator
210207, 210521, 261113, 261123, B01D 2102
Patent
active
051396572
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
According to the conventional technology, maintaining an aerobic condition and settling solid matters in water have not been accomplished at the same time. More particularly, when it is desired to supply oxygen into water, there has been no alternative other than letting air pass through the water in a bubbling manner on a large scale. On the other hand, the settlement of solid matters is done by keeping the water stationary or by causing a centrifugal motion of the water. These two phenomena can not occur at the same time. Considering the sewage treatment currently carried out as a concrete example, treated water through an aeration tank contains a large number of microorganisms and small metazoans and is in great demand of oxygen. Accordingly, in a precipitation or settling tank, it is inevitable that oxygen in the treated water is used up in a short period of time and the treated water comes to a state of containing no oxygen. As concerns supplying oxygen while removing carbonic acid gas, according to the conventional technology, any measures except ventilation with strong stirring of water have been considered to be impossible.
The present invention is an apparatus which can perform settlement in an aerobic manner.
Letting air effectively pass through water has been considered to be best for bringing the water to an aerobic condition, and to bring about such a condition involves stirring of the water. On the other hand, when causing settlement, water has to be kept stationary and, therefore, it is impossible to let air pass therethrough. However, the applicant of the present invention has filed another international application entitled "MULTIPLE-GAS-PHASE BREEDING METHOD" (PCT/JP88/00925). In that application, a new method of supplying oxygen into water, or a ventilation method which is sure and involves less stirring effect, has been proposed. The method proposes holding air in plural piles under water to physically increase a contact surface area between the air and water. This method has the characteristic feature that natural water surfaces are artificially provided under water in countless numbers and, at the same time, breeding places for life are countlessly provided.
SUMMARY OF THE INVENTION
The present invention is a multiple gas-phase settling tank characterized by a container group which is composed of flat containers each fixed horizontally and upside down for a purpose of holding a predetermined quantity- of gas under water, a number of which containers are arranged vertically in multiple stages at fixed intervals, and hollow projections provided on vent ports of the respective containers of the container group, which vent ports are respectively formed in parts of bottoms (corresponding to upper partitions) of the containers, which hollow projections protrude downward for shorter distances than the heights of side walls of the containers and are in communication with the respective vent ports. Further, the invention can employ a multiple-gas-phase settling tank wherein, in the above-mentioned container group, in spaces of fixed intervals existing between adjacent upper and lower containers, which spaces, under water, make passages for allowing water to freely come in and out partitions are provided to block part of the spaces to limit the entrance and exit of water.
When the invention is put in operation in a tank, the following occurs. The respective containers of the container group are fixed upside down at fixed intervals within the tank and, when ventilating the lowermost container, a fixed quantity of the gas is held therein for the height of the hollow projection. Gas in excess of the fixed quantity ascends through the hollow projection, which is in communication with the vent port, to be held in the upper containers again. This means that, when continuously ventilating the lowermost container, all the upper containers can be ventilated in order through the hollow projections thereof. It should particularly be noted that the ascent at this time is not
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Nojima Hisatake
Nojima Youko
Silverman Stanley S.
Upton Christopher
Yuugen Kaisha Parasight
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