Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
1997-04-04
2001-06-26
Lithgow, Thomas M. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
C210S624000, C210S625000, C210S629000, C210S705000, C210S724000, C210S725000, C210S732000
Reexamination Certificate
active
06251277
ABSTRACT:
The invention relates to a method for purifying protein containing waste water, in which (a) a first insoluble protein containing material is caused to form in the waste water, (b) the mixture obtained in step (a) is separated to form pre-purified waste water, (c) the pre-purified waste water is treated with aerobic microorganisms and (d) the mixture obtained in step (c) is separated to form finely purified waste water. The invention also relates to a device for purifying protein containing waste water.
WO 92/19547 describes a method and device for purifying waste water containing carbohydrates, proteins and fats. In this method, waste water is fed in a first step to a first aeration tank which contains microorganisms. Then a cationic and/or an anionic polymer and possibly a solution of an iron(III) salt in water is fed to the waste water to make some of the microorganisms flocculate and to remove phosphate. The waste water is then fed to a flotation device, where it is separated into flotation sludge and a first effluent. The first effluent is then fed to a second aeration tank which also contains microorganisms and is provided with a separating device. In said second aeration tank, the first effluent is purified to form purification sludge and a second effluent. Some of the purification sludge is then fed back to the first aeration tank and another portion is fed back to the second aeration tank. According to WO 92/19547. The method and the device are suitable, in particular, for purifying waste water originating from a foodstuffs processing factory.
The method and the device according to WO 92/19547 have, however, a number of disadvantages. Both the first and the second purification step comprise a biological purification with the aid of microorganisms. Because, in particular, the biological purification in the first step requires a large amount of oxygen, the energy consumption is high in the first stap. If sufficient oxygen cannot be fed to the device, for example if the waste water to be purified containing a large amount of impurities, a strong stench due to rotting may be produced, which is disadvantageous for this immediate dwelling and working environment of the device, The purification sludge as such is also no longer directly usable, for example in agriculture or as an additive for livestock fodders. One more disadvantage of the device according to WO 92/19547 is that the device must be operated for an expedient employment on a relatively large scale, which not only imposes a load on the available space, our also requires large investment.
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Friesland Brands B.V.
Lithgow Thomas M.
Pepper Hamilton LLP
Villacorta Gilberto M.
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