Liquid purification or separation – Processes – Treatment by living organism
Patent
1996-11-13
1998-09-01
Cintins, Ivars
Liquid purification or separation
Processes
Treatment by living organism
210661, 210150, 2102212, 210274, 210290, C02F 308
Patent
active
058007105
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for the biochemical purification of a liquid medium containing contaminants, the liquid medium being passed through a bed provided in a holder and comprising a granular filter material.
Such methods are generally known. In these methods, the liquid medium is generally purified because the granular filter material retains and/or absorbs contaminants and lets the liquid medium through.
The object of the present invention is to provide an improved method and apparatus of the abovementioned type.
According to the invention, this object is achieved in that the granular filter material contained in the holder is set in motion. In this connection, the granular filter material is preferably set in motion by the injection of a gas, such as air. On the granular material there forms a layer, generally a slimy layer, containing bacteria and/or microorganisms which absorb and/or convert the contaminants, in which process they purify the liquid medium again chemically. Surprisingly, the purifying action of the bacteria and/or microorganisms appears to be considerably assisted if the granular material is set in motion. In this process, the purifying action is further stimulated by using a suitable gas for setting in motion. Such a suitable gas may in many cases be air. The sitting up of the bed is counteracted by the granular filter material being circulated.
According to the invention, it may be advantageous for the further improvement of the purifying action if microorganisms and/or an activator for microorganisms are/is fed to the holder. Use can also be made of microorganisms which are already present in the medium and/or on the filter material. Furthermore, known further purifying agents for, for example, aqueous systems, as well as nutrients for the microorganisms can be added, as is generally known to persons skilled in the art. Instead of, or in addition to, microorganisms, bacteria and/or an activator for bacteria may also be supplied.
According to the invention, the support function of the filter material for microorganisms and/or bacteria can be appreciably improved if the filter material comprises porous granules in which the microorganisms and/or bacteria are able to lodge. The more porous the granules, the greater is the contact surface of the medium to be purified with the bacteria and/or microorganisms.
All the known filter materials for biological filters, such as, in particular, porous granules, may be used. These materials may optionally be formed into granules having the desired size before use. Filter materials and purifying agents provided on granular support materials may also be used.
A BWC (Bio Water Clean), such as the BRC (Bio Reactor Clean) related thereto, may be used as activator.
A typical composition for Bio Water Clean is:
The elements normally found furthermore also comprise: aluminium, antimony, barium, bromine, cadmium, chlorine, chromium, cobalt, fluorine, iodine, lead, mercury, nickel, selenium, silicon, sodium, strontium, tin, tungsten and vanadium.
If Bio Water Clean is used with the filter according to the application, the following advantages are obtained if the filtration water is recirculated to the glasshouse for watering plants: products; the plants.
This makes it possible to use, for example, tap water and/or ditch water in the watering of glasshouses without undesirable build-up of salts in the recirculation system, for example in the mats on which the plants are cultivated.
According to the invention, it is advantageous, in particular, if the filter material comprises fairly large, preferably porous, granules and fairly small granules. The fairly small granules are then able to fill up the gaps between the fairly large granules so that the contact between the granules and the filter material is improved.
According to the invention, a very suitable filter material comprises a mixture of lava and sand. Such a mixture is preferably composed of 28% to 38% sand and 61% to 71% lava. A so-called filtering sand, for example, can be used as
REFERENCES:
patent: 4256573 (1981-03-01), Shimodaira et al.
Cintins Ivars
Shieer Globe N.V.
LandOfFree
Method and apparatus for the biochemical purification of a liqui does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for the biochemical purification of a liqui, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for the biochemical purification of a liqui will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-266512