Liquid purification or separation – Plural distinct separators – Filters
Patent
1996-06-14
1997-10-28
Walker, W. L.
Liquid purification or separation
Plural distinct separators
Filters
210332, 210401, 210410, 2104161, B01D 2915
Patent
active
056814658
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to filtration equipment for clarifying food products such as beer or sake or for clarifying chemical products such as flocculants or paper coating agents, and more particularly to filtration equipment with a filtrate recovery apparatus.
BACKGROUND OF THE INVENTION
Conventionally, as filtration equipment of the type described, filtration equipment of the suspended filtration element type and filtration equipment of the upright filtration element type are known.
First, a conventional filtration equipment of the suspended element type is described with reference to FIG. 10. FIG. 10 is a partial sectional view of a conventional filtration equipment of the suspended element type.
As shown in FIG. 10, a filtration equipment of the type described includes an upper tank 101a and a lower tank 101b partitioned and sealed from each other by a partition plate 103. A plurality of tubular filtration elements 102 made of a ceramics material and each closed at the lower end thereof are provided in a suspended condition on the partition plate 103.
Suspension to be filtered is supplied into the lower tank 101b by a pump 110 and is filtered by the tubes of the filtration elements 102, whereafter it is collected into the upper tank 101a through hollow portions. The filtrate filtered and collected into the upper tank 101ais delivered to a filtrate storage tank (not shown). Filter aid is precoated on the surface of each of the filtration elements 102 so that choking of the filtration elements 102 is prevented to maintain a stabilized filtration capacity.
A conventional filtration equipment of the upright filtration element type is described with reference to FIG. 11. FIG. 11 is a sectional view of a conventional filtration equipment of the upright element type.
As shown in FIG. 11, a filtration equipment 121 of the type mentioned includes a delivery pipe 125 provided at a lower portion of a tank 121a and connected to a filtrate storage tank (not shown), and a plurality of tubular filtration elements 122 are provided uprightly on a delivery pipe 125. Hollow portions of the filtration elements 122 and a hollow portion of the delivery pipe 125 are communicated with each other so that the suspension supplied to the tank 121a passes through and is filtered by the filtration elements 122 and then delivered to the filtrate storage tank through the delivery pipe 125. It is to be noted that, also with the filtration equipment 121 of the upright element type, filter aid is precoated on the surfaces of the filtration elements 122 in order to maintain a stabilized filtration capacity.
By the way, whether the filtration equipment is of the suspended element type or of the upright element type described above, although filter aid is precoated on the surfaces of the filtration elements, if filtered substances adhere to and are deposited in a large amount on the surfaces of the filtration elements, then the filtration capacity of the filtration equipment is deteriorated. Therefore, the filtered substances deposited on the surfaces of the filtration elements must be removed by washing in accordance with necessity. In this instance, the filtration operation is interrupted once and the suspension remaining in the tank is processed, and then the filtration elements are washed individually.
For the processing of the suspension remaining in the tank, it would seem possible to recover the full amount of the suspension from the tank and then resume filtration processing after the filtration elements are washed. However, since filtered substances deposited on the surfaces of the filtration elements merely adhere to the surfaces of the filtration elements by a pressure difference caused by flows of the liquid from the suspension side (primary side) to the filtrate side (secondary side), there is the possibility that, upon recovery, the filtered substances (including the filter aid) deposited on the surfaces of the filtration elements may exfoliate and mix into the suspension. Further, in filtration of, f
Kawamori Shoji
Kawanishi Katsuoki
Kobayashi Kouhei
Takenoya Kenichi
Tsubone Tsuyoshi
Human Techno Co., Ltd.
Sapporo Breweries Ltd.
Walker W. L.
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