Liquid purification or separation – With gas-liquid surface contact means
Patent
1987-11-30
1989-08-22
Wyse, Tom
Liquid purification or separation
With gas-liquid surface contact means
261123, C02F 306
Patent
active
048593214
DESCRIPTION:
BRIEF SUMMARY
Technical Field
The present invention relates to a water treating device having a water wheel arranged on upper side of an immersion filter bed so as to perform surface aeration, which device can be used in treatment of not only industrial wastewaters but also sewage water exhausted from hospitals, offices, houses or the like.
BACKGROUND ART
A water treating device of above-mentioned type in the prior art is disclosed, for example, in Japanese patent publication No. 54638/1983.
The water treating device is constituted in that a water wheel is rotatably fixed on upper side of a treating tank, a circulation partitioning plate with lower side opened is installed from just below a water raking-out member of the water wheel throughout the whole width region of the treating tank, the water level is adjusted so that a part of the water raking-out member of the water wheel is sunk in the water, water circulation is generated from the circulation partitioning plate as the border by rotating the water wheel, and an immersion filter bed is arranged at least on one side of the circulation partitioning plate.
The immersion filter bed is formed by contact materials such as Rasching ring, plastic short tubes in net shape or small stones (gravel), filled or suspended.
In the filter bed constituted by the contact materials, however, if the specific gravity of the contact material is more than 1.0, the voidage is gradually decreased towards the bottom of the treating tank. On the other hand, if the specific gravity is less than 1.0, the voidage is gradually decreased towards the top of the treating tank. Consequently, it is difficult to obtain the contact flow of suitable rate for adhering and activation of microorganisms (If too slow, the microorganisms cannot be adhered; if too rapid, oxygen supply becomes insufficient), and to secure the voidage which cannot be closed by flocks or waste throughout the whole filter bed. If closing of the immersion filter bed is produced, the filter bed must be washed. However, the washing is troublesome and not preferable because the microorganisms are washed away (Time is required for the microorganisms to be adhered to the filter bed again).
DISCLOSURE OF INVENTION
The invention consists in a water treating device wherein a water wheel is arranged on upper side of an immersion filter bed so as to perform surface aeration, characterized in that the immersion filter bed is composed of a plurality of filter bed elements including net-shaped substance as main element, stood in parallel or laminated.
According to the feature, in the invention, the contact flow having suitable rate to adhere the microorganisms to the filter bed and activate them can be obtained throughout the whole filter bed, and the voidage which is not easily closed by flocks or water can be secured throughout the whole filter bed. Consequently, the wastewater treating efficiency per unit capacity of filter bed is significantly improved and the water treating tank can be made compact.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a sectional view illustrating a first embodiment of the invention taken in line I--I of FIG. 2;
FIG. 2 is a sectional view taken in line II--II of FIG. 1;
FIG. 3 is a plan view of FIG. 1;
FIG. 4 is a sectional view illustrating a modification of the first embodiment of the invention;
FIG. 5 is a sectional view illustrating another modification of the first embodiment of the invention;
FIG. 6 is a sectional view illustrating a second embodiment of the invention;
FIG. 7 is a plan view illustrating a third embodiment of the invention;
FIG. 8 is a sectional view of FIG. 7;
FIG. 9 is a sectional view illustrating a fourth embodiment of the invention;
FIG. 10 is a perspective view of an immersion filter bed with filter bed elements suspended;
FIG. 11 is a perspective view of a net tube as a first example of net-shaped substances to be used in the invention;
FIG. 12 is a perspective view of a flat net tube as another example of net-shaped substances;
FIG. 13 is a front view of a fishing net as anothe
REFERENCES:
patent: 3402125 (1968-09-01), Tanaka
patent: 3773660 (1973-11-01), Hopwood
patent: 4364826 (1982-12-01), Kato
patent: 4416993 (1983-11-01), McKeown
patent: 4680111 (1987-07-01), Veda
LandOfFree
Aeration type water treating device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aeration type water treating device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aeration type water treating device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2416294