Liquid purification or separation – Filter – Material
Reexamination Certificate
1996-10-25
2001-09-11
Cintins, Ivars (Department: 1724)
Liquid purification or separation
Filter
Material
C210S504000, C210S506000, C428S402000, C502S402000, C502S417000
Reexamination Certificate
active
06287468
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a granular carriers and a method for producing the same, and to an apparatus for treating sewage or waste water by using the granular carriers.
Description of the Prior Art
Generally, as a microorganism fixing carrier for treating organisms, a granular carrier with a small specific surface or a coated granular carrier has been utilized in practice. The granular carrier and inorganic powder are required to have a great intensity and a great attaching intensity, respectively.
However, in the prior art, since the specific surface of the granular carrier is small, the number of the microorganisms attached thereto is reduced. In case that the granular carrier has a large specific surface, during a prolonged aeration, the attached inorganic powder is separated from the carrier. Particularly, in case of treating certain industrial waste water, the carrier is worn out due to the hot waste water and mechanical shocks so that the specific surface of the carrier is not sufficiently utilized, the control of the size thereof within a desired range is difficult and the techniques for controlling the temperature and moisture in a reaction chamber is required.
Furthermore, as a method for treating indissoluble waste water of high density, an activated sludge treatment method has been widely used. The activated sludge treatment method resolves polluters dissolved in the waste water by using only sludge microorganisms in an aeration tank. However, since a quantity of mixed liquid suspended solids (“MLSS”) in the aeration tank is about 2,000 to 3,000 mg/L, the treatment time is increased, thereby an amount of air to be consumed becomes larger, resulting in a larger air generating arrangement for injecting air artificially. In order to get a large amount of air with a low cost, the activated sludge treatment method employs a root blower instead of a compressor which results in a high cost. Pressure of the root blower is limited to a range of 0.5 to 0.6 Kg/Cm
2
, thereby the height of a water tank is restricted to a range of about 4 to 6 meters. Under the above condition, since only 3 to 7% of oxygen supplied is dissolved in the water, a large amount of air must be required.
As described above, in the prior art, it is difficult to control within a desired range the grain size of the carriers for treating sewage or waste water and to produce the carriers. In addition, the sewage or waste water treatment apparatus requires a large amount of air, thereby resulting in a high cost.
SUMMARY OF THE INVENTION
It is, therefore, a primary object of the invention to provide a granular carrier having a great mechanical wear-resistance, a great chemical-resistance, a high intensity, a high inorganic powder attachment intensity, and an increased specific surface, thereby allowing a great number of microorganisms to attach to the surface thereof, resulting in a high speed treatment of sewage or waste water.
It is another object of the invention to provide a method in which a ratio of components to be mixed and the size and specific gravity of granular carrier can be adjusted with ease so that the requirements for various uses can be achieved with ease and yield is considerably increased.
It is still another object of the invention to provide an apparatus for treating sewage or waste water by, using the above granular carriers, the apparatus treating the sewage or waste water rapidly by the granular carriers being once projected and circulated in a treatment tank without any change thereof, thereby increasing the treatment efficiency thereof.
In accordance with an aspect of the present invention, there is provided a granular carrier for treating sewage or waste water, comprising: a tire powder of 100 parts by weight; an ethylene vinylacetate copolymer(“EVA”) or its derivative of 30 to 50 parts by weight, the EVA or its derivative which serves as a bonding agent having hydrophilicity and bonding force chemically stable, the EVA or its derivative being insoluble at a high temperature; and an activated carbon or inorganic micropowder equivalent thereto of 5 to 10 parts by weight.
In accordance with another aspect of the present invention, there is provided a method of producing granular carriers for treating sewage or waste water, which comprises the steps of: mixing a tire powder of 100 parts by weight and an EVA or resin of 30 to 50 parts by weight, the resin having bonding force and hydrophilicity equivalent to that of the EVA; resolving the EVA or its derivative of the mixture at a temperature of 100 to 250° C.; bonding an activated carbon to the tire powder; extruding the mixture through an extrusion machine; cutting the mixture extruded from the extrusion machine; and attaching the activated carbon powder to the EVA or its derivative dissolved on the surface of the cut part of the mixture.
In accordance with still another aspect of the present invention, there is provided an apparatus for treating sewage or waste water by using a plurality of granular carriers, which comprises: an outer housing; an inner case disposed in the outer housing; a supplier for supplying the sewage or waste water, the supplier being installed on top of the outer cylinder; a granular carrier separating duct for removing bubbles attached to the granular carriers therefrom and guiding the granular carriers downwardly, the granular carrier separating duct being located on top of the inner cylinder; an outlet duct for discharging the treated sewage or waste water, the outlet duct being disposed on top of the granular carrier separating duct; an inner and an outer air injection pipes for injecting air into the inner case and the outer housing, respectively, the inner and an outer air injection pipes being spaced apart form each other vertically; a compressed air injection duct for injecting the compressed air into the outer housing, the compressed air injection duct being located under the inner case; an overflow duct for overflowing the sewage or waste water, the overflow duct being disposed over the granular carrier separating duct; a guiding duct for guiding the sewage or waste water overflowed to the outlet duct; and a slant member for guiding the flow direction of sewage or waste water and granular carriers.
REFERENCES:
patent: 3536615 (1970-10-01), Bunn
patent: 3567660 (1971-03-01), Winkler
patent: 3739913 (1973-06-01), Bogosian
patent: 4077923 (1978-03-01), Tanaka et al.
patent: 4802985 (1989-02-01), Sugimori et al.
Cintins Ivars
Perman & Green LLP
Sam Kwang Aqua-Clear, Inc.
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