Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – With spaced non-particulate separating means
Reexamination Certificate
1999-05-12
2001-05-01
Simmons, David A. (Department: 1724)
Liquid purification or separation
Particulate material type separator, e.g., ion exchange or...
With spaced non-particulate separating means
C210S283000, C210S289000, C210S352000, C210S502100
Reexamination Certificate
active
06224764
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is in the water purifying and disinfecting field.
2. Description of the Background Art
U.S. Pat. No. 4,298,475 discloses an apparatus of which the tubular plastics housing accommodates an inlet-end stage of porous material, a further stage having a polyhalide anion exchange resin layer, an intermediate filter of porous polymer, an outlet filter of porous polymer and a mouthpiece. Owing to this construction, sewage water is sufficiently disinfected from microorganisms and mechanical impurities are removed to a certain extent. If, using the known apparatus, for example, river water having an initial enteric bacteria contamination of 10
5
microbe cells/liter and having a content of mechanical impurities of from 60 to 100 mg/liter is sucked up continuously, the water leaving the outlet end has a contamination of enteric bacteria of from 10 to 100 microbe cells/liter and a content of mechanical impurities of from 40 to 70 mg/liter.
Those values are inadequate. In addition, the amount of water that can flow through the housing is small when the water contains a large amount of impurities of organic and inorganic origin. The average amount of water which can be taken up using such an apparatus is not more than from 10 to 15 l. The known apparatus must then be discarded.
U.S. Pat. No. 4,995,976 discloses an apparatus having a tubular housing of polycarbonate in the case of which the inlet-end stage is formed by an inlet filter which is produced from porous plastics material having a pore size of 80 &mgr;m and which is placed on the inlet end of the housing. A purification stage which is formed by a purifying resin and which is used to kill bacteria, organic materials and organisms adjoins the inlet-end stage. The next stage contains activated charcoal for absorption. Finally, a sterilisation stage is provided. The individual stages are separated from one another by porous spacer discs. A respective layer of resilient foam having a larger pore size than the inlet filter or the spacer discs is provided on the front and the rear end of the activated charcoal layer.
This apparatus is able to provide purification and disinfection of water improved by one order of magnitude compared with the apparatus known from U.S. Pat. No. 4,298,475. The total amount of water which can be purified using this apparatus is, however, not greater.
SUMMARY OF THE INVENTION
The problem of the invention is to provide, using constructionally simple means, an apparatus for purifying and disinfecting water by means of which it is possible to purify and disinfect adequately a large amount of water.
That problem is solved by an apparatus for purifying and disinfecting water including a tubular housing comprising a rear inlet end and a front outlet end, a disinfection stage and an absorption stage containing activated charcoal being provided in said housing between said rear inlet end and said front outlet end, each of said disinfection stage and said absorption stage having a front end and a rear end at which a respective perforated cylindrical insert is arranged, said cylindrical inserts having an outside diameter which corresponds substantially to the inside diameter of said housing, said inserts at said front and said rear end of said disinfection stage and said insert at said front end of said absorption stage being arranged to be stationary and said insert at said rear end of said absorption stage being arranged to be axially displaceable, a spring element exerts a pressing force on said insert at said rear end of said absorption stage in the direction towards said absorption stage being provided in the tubular housing between said insert at said front end of said disinfection stage and said insert at said rear end of said absorption stage.
The apparatus according to the invention ensures adequate disinfection of bacteria, viruses and bacteriophages regardless of the initial contamination of the water. The resilient force of the spring element moves the insert at the rear end of the absorption stage in the direction of insert at the front end of the disinfection stage when the volume of the adsorption stage increases due to adsorbed substances. Therefore both, formation of ducts in the adsorption stage through which the water could flow without sufficient absorption and clogging of the absorption stage is prevented. Further the spring element creates turbulences in the space between the absorption and the disinfection stage. This involves an improved mixing and a longer residence time of the solved iodine in the water which leads to a more effective disinfection.
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patent: 4995976 (1991-02-01), Vemes et al.
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Kim Zoya Kirillovna
Matyushin Gennady Alexeevich
Lawrence Frank M.
R-Amtech International, Inc.
Rothwell Figg Ernst & Manbeck
Simmons David A.
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