Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1991-12-06
1993-10-26
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204242, 204269, 204275, 210128, C02F 146
Patent
active
052562638
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method of purifying lacustrine water and a filthy water purification boat.
BACKGROUND ART
In a lake (the word "lake" used herein means a pond, a marsh and the like in addition to a lake), water is hard to move as compared with in the sea or rivers, resulting in stagnating and fails to exhibit a satisfactory self-purifying action, so that pollution of lacustrine water gets worse, to thereby often cause production of algae, odor development and the like.
Purification of lacustrine water thus polluted has been conventionally carried out by arranging an aeration system at a lake, installing a water treating system on the land, or drawing up water by means of a pump from a lake for treatment.
DISCLOSURE OF INVENTION
However, use of the aeration system for evenly purifying lacustrine water requires lots of time. Purification of lacustrine water through the water treating system requires arrangement of a water suction and guide pipe network over a whole lake. Unfortunately, this obstructs navigation of boats, so that it is difficult to evenly purify lacustrine water. The present invention solves the above-described problem by operating, on a lake, a filthy water purification boat mounted with a calcium fluoride electrolyzing device.
In accordance with one aspect of the present invention, a method of purifying lacustrine water is provided. The method comprising the steps of operating a boat provided with a calcium fluoride electrolyzing device, a DC power supply device electrically connected to the electrolyzing device and a coagulant pouring device on a lake, and concurrently introducing lacustrine water into the electrolyzing device and pouring coagulant into lacustrine water through the coagulant pouring deivce.
In a preferred embodiment of the method of the present invention, the boat is further provided with a flock recovering device for recovering a part or all of the flocks produced.
In a preferred embodiment of the method of the present invention, lacustrine water introduced into the electrolyzing device is treated while being stirred.
In accordance with another aspect of the present invention, a filthy water purification boat is provided. The boat comprises an electrolyzing device suspendedly arranged at a lower portion of the boat and including a plurality of electrode plates juxtaposed to each other at suitable intervals on struts and a cage arranged between each adjacent two of the electrode plates for receiving fluorite therein; a coagulant pouring device including a pipe provided with coagulant pouring nozzles and arranged forward of the electrode plates and a coagulant tank arranged on the boat; and a DC power supply arranged on the boat and electrically connected to the electrolyzing device.
In a preferred embodiment of the filthy water purification boat of the present invention, a flock recovering device of which at least a part is arranged at a rear portion of the boat is further provided.
In the present invention constructed as described above, the filthy water purification boat on which the calcium fluoride electrolyzing device, DC power supply and coagulant pouring device are mounted and the flock recovering device may be further mounted as desired is operated on a lake. With operation of the filthy water purification boat, the electrolyzing device is actuated and coagulant is fed to the pipe provided with the coagulant pouring nozzles; so that lacustrine water is caused to flow between the electrodes, during which lacustrine water is fed with fluorine ions (F.sup.-) and coagulant. The fluorine ions cause polluting substances contained in lacustrine water to form flocks and the coagulant causes the flocks to be increased in particle size, so that lacustrine water may be purified. The flocks thus large-sized are recovered through the flock recovering device to the boat or settle on a bottom of a lake due to a decrease in volume of the flocks by a hydrophobic action of the flocks. The purified water is returned to a lake during operation of the
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patent: 4337136 (1982-06-01), Dahlgren
patent: 4747958 (1988-05-01), Eberhardt
patent: 4770755 (1988-09-01), Valanti et al.
Niebling John
Phasge Arun S,.
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