Liquid purification or separation – Processes – Using magnetic force
Patent
1996-11-15
1999-03-30
Woo, Jay H.
Liquid purification or separation
Processes
Using magnetic force
210721, 210760, 210763, 210806, 210807, 210192, 210199, 210201, 210205, 210223, C02F 148
Patent
active
058884033
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a water treatment process and a water treatment system for purifying water such as waste water, ground water, river water, lake/marsh water, sea water or reservoir water.
BACKGROUND ART
A water treatment process utilizing ozone is one of advanced water treatment processes for purifying waste water, ground water, river water, lake/marsh water, sea water, storage water or the like.
Conventionally, the water treatment process utilizing ozone comprises the steps of dissolving ozone in water and reacting the dissolved ozone with substances to be oxidized in the water.
More specifically, the process employs an aerator plate disposed at the bottom of a large water vessel to diffuse fine bubbles of ozone in the water. In order to dissolve as much ozone as possible, the greatest possible water depth is provided while the bubbles are made as fine as possible. In practice, however, the depth is limited to 5 m to 6 m at the maximum and the size (diameter) of the bubble to about 20 .mu.m at the minimum.
The process requires an ozone residence time of about 8 minutes to about 10 minutes for the reaction and a large-scale system such as having an ozone dissolution vessel and the like.
Even with such a system, the utilization factor of ozone is only about 60% to about 80%.
Where water containing inorganic substances to be oxidized such as soluble iron and manganese and organic substances is to be treated, inorganic substances more susceptible to oxidization are first oxidized by ozone injected into the water, so that the decomposition of the organic substances by oxidation is slowed.
This is because the oxidization of the inorganic substances entails production of colloidal substances which consume ozone. Accordingly, the amount of ozone used in a process for the decomposition of the organic substances reaches several times an amount required for the intended treatment.
Although the aforesaid problem may be solved by injecting ozone again after removal of the colloidal substances, the colloidal substances have particle diameters on the order of submicron and are difficult to be removed as they are.
Therefore, a need exists for adding a coagulant to increase particle diameters of the colloidal substances for separation and removal thereof.
Such a treatment requires additional facilities such as a reaction vessel and an apparatus for adding the coagulant. Furthermore, the addition of the coagulant results in an increase of waste products.
In view of the foregoing, it is an object of the present invention to provide a simplified water treatment process and system which are capable of purifying water without addition of a coagulant and offer an improved use efficiency of ozone.
DISCLOSURE OF INVENTION
A water treatment process of the present invention comprises the steps of: injecting ozone into water to be treated, while applying a magnetic force to the water, for oxidation and coagulation of substances to be oxidized; filtering away coagulated substances; injecting ozone into the resulting water, while applying a magnetic force to the water; passing the resulting water through a catalytic layer of activated carbon; and filtering away coagulated substances.
A water treatment system of the present invention comprises: first and second ozone generators; a first magnetic treatment reaction vessel including a magnetic treatment section for introducing therein water to be treated and applying a predetermined magnetic force to the water, and an ozone injecting/mixing section for injecting ozone generated by the first ozone generator into the water introduced from the magnetic treatment section and mixing the ozone with the water; a first filter for filtering away coagulated substances from the water introduced from the first magnetic treatment reaction vessel; a second magnetic treatment reaction vessel including a magnetic treatment section for introducing therein the water from the first filter and applying a predetermined magnetic force to the water, and an ozone injecting
REFERENCES:
patent: 4098582 (1978-07-01), Takeda
patent: 4655933 (1987-04-01), Johnson et al.
patent: 4879045 (1989-11-01), Eggerichs
patent: 4954263 (1990-09-01), Woodhouse
patent: 5130032 (1992-07-01), Sartori
patent: 5145585 (1992-09-01), Coke
patent: 5433719 (1995-07-01), Johnson et al.
patent: 5466367 (1995-11-01), Coate et al.
patent: 5505856 (1996-04-01), Campen et al.
patent: 5622622 (1997-04-01), Johnson
Morrison Betsey J.
Woo Jay H.
LandOfFree
Water treatment process and system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Water treatment process and system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water treatment process and system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1210896