Liquid purification or separation – Processes – Treatment by living organism
Patent
1992-03-19
1995-01-10
Hruskoci, Peter A.
Liquid purification or separation
Processes
Treatment by living organism
210150, 210232, 261 94, 261DIG72, C02F 310
Patent
active
053804392
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a "biological filter" whose enclosure can be submerged in the liquid to be treated.
Biological filters are used in particular for the treatment of waste water. These filters are in fact treatment vessels or basins comprising substrates or supports for bacteria beds involved essentially in the breakdown of the organic matter contained in the waste water.
TECHNICAL BACKGROUND
In biological filtration it is known to use various systems functioning aerobically or anaerobically, such as fixed or fluidised bacteria beds, biodiscs and activated sludge processes.
The document FR-A-2,565,579 has proposed an installation for the treatment of waste water by microorganisms, in which installation the treatment microorganisms are absorbed on glass fibres assembled in the manner of a cylindrical brush; they can be desorbed therefrom by mechanical action, which regenerates the treatment members.
The use of glass fibres and their assembly in the form of a cylindrical brush makes this type of installation costly, without any guarantee of easy accessibility to the bacteria bed formed.
The document DE-A-3,110,859 describes multiple-use devices, in particular for exchanges of materials, comprising spiralled plates.
The document CH-A-621,263 describes a device for treating liquids with gases, comprising a conduit containing metal shavings or plastic materials.
All these systems offer only a small fixation surface for the bacterial film relative to the weight of the support used, or they require heavy infrastructures. Their servicing in the event of blockage is difficult, given their great volume and their lack of internal accessibility.
AIMS OF THE INVENTION
The present invention aims to improve the surface available for the bacterial fixation and to reduce the cost of the infrastructures peripheral to the bacterial support, while at the same time providing easy accessibility for their servicing.
PRINCIPAL CHARACTERISTICS OF THE INVENTION
According to the present invention, the submersible biological filter for the purification of waste water is characterised in that it comprises, as bacterial support, an assembly of skeins of essentially continuous bands made of plastic material in a spiral arrangement around at least two holding members.
The assembly of the skeins of bands is used by charging it with a bacteria bed according to conventional techniques and by arranging it, by virtue of the holding members, in a basin for waste water treatment, preferably in several successive vertical planes.
The holding members advantageously are in the form of a frame which can be extracted with the skeins of bands with which it is lined.
In one basin it is possible to arrange, in parallel vertical planes, 3 to 10 frames of this type per running metre.
The bands forming the skeins are essentially continuous, that is to say they have a large length so that they can be arranged easily around the holding members which in principle only need to hold the bands at their ends.
Of course, an interruption may arise as a result of tearing or when the end of a reel is reached, and in this case an intermediate fixation on the holding member may be required.
According to another embodiment, it is preferable to ensure the fixation of the bands on the holding member by clipping on a longitudinally slotted tube of a diameter greater than the holding member.
The bands can be obtained from a bar of plastic material converted into continuous bands and spiralled by turning.
The bars of plastic material used are of any plastic material capable of giving a thin band, preferably by turning, by means of a cutting tool. The width of the band is in general a few tens of millimetres and its thickness is preferably several hundredths of a millimetre. Any other dimensions can be chosen without departing from the scope of the present invention.
It has been found that the technique of obtaining bands by turning a bar of plastic material by means of a cutting tool gives a non-smooth band which is particularly suited
REFERENCES:
patent: 4169050 (1979-01-01), Serfling et al.
patent: 4303600 (1981-12-01), Roe
patent: 4396507 (1983-08-01), Grant
patent: 4422930 (1983-12-01), Hatanaka
patent: 4929484 (1990-05-01), Basse
patent: 5160395 (1992-11-01), Basse et al.
patent: 5168058 (1992-12-01), Bohak et al.
patent: 5194231 (1993-03-01), Gough et al.
Patent abstract of Japan, vol. 12, No. 482 (C-533) (3329), Dec. 15, 1988 & JP, A, 63197600 (Nishihara Environ. Sanit. Res. Corp.) Aug. 16, 1988.
Cofido S.A.
Hruskoci Peter A.
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