Liquid purification or separation – Processes – Treatment by living organism
Patent
1996-08-21
1999-10-05
Woo, Jay H.
Liquid purification or separation
Processes
Treatment by living organism
210620, 210622, 210623, 210624, 210626, 210650, C02F 300, C02F 302
Patent
active
059618299
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for the purification of water, more especially condensate originating from a composting process and to the use of a bioreactor for performing such a method. The invention furthermore relates to a method for the composting of organic materials and to an apparatus for the performance of this method.
BACKGROUND OF THE INVENTION
The German patent publication 3,637,393 C, the German patent publication 3,811,399 A and the German patent publication 2,541,070 A disclose composting methods, in which organic materials, more particularly those containing waste materials (or "biowaste"), are composted. More particularly the said German patent publication 3,637,393 C, describes a method and an apparatus, in which organic materials are composted in a sealed container using forced ventilation.
In the prior art composting methods exhaust air purification takes place, with the production of water, since on falling below the dew point on cooler surfaces water vapor entrained in the air and originating from the biological reaction or, respectively, conversion is condensed out.
The composting of kitchen and garden waste, which has been separately handled in the garbage collection service, leads to the release of substantial quantities of water. When the hot exhaust air has cooled down so far that no odors escape into the atmosphere, condensate is produced. So far exhaust air from biological processes, more particularly from composting processes, has been passed through biological filters for reducing the odor fraction, the humidity water being substantially caused to precipitate, this meaning that the filters became clogged on the inlet side. The liquid then produced, which is hard to dispose (also named "percolating water") is heavily contaminated owing to the contact with the biomass and accordingly possessed a very high oxygen requirement (a CSB of approximately 40,000 to 80,000 mg O.sub.2 /l). As a consequence of technical developments filters were provided with upstream cooling traps or scrubbers so that the liquid no longer came into contact with the biomass, in order to reduce the CSB (chemical oxygen requirement) value and the BSB (biochemical oxygen requirement) value of the condensate. The CSB values then resulting amounted approximately to 5,000 mg O.sub.2 /l. This value as well is however still in need of improvement.
SUMMARY OF THE INVENTION
One object of the invention is to provide a method for the purification of water, more particularly condensate resulting from a composting process, with which such purification action may be improved upon.
In accordance with the invention this aim is to be achieved by cleaning the water in a bioreactor, more particularly a high performance bioreactor.
Preferably the water is brought into contact with oxygen, preferably atmospheric oxygen, in the bioreactor and/or agitated.
The water is preferably filtered. It is an advantage if the water is ultra-filtered, for example in an ultra-filtration module.
The composition of the water to be purified is preferably so altered that a biological clarification process is possible.
Preferably the active substances, which determine the oxygen requirement, in the water to be purified are measured. In accordance with a further advantageous development the active substances to be removed from the water are set. This is preferably by measurement of the active substances, on which the oxygen requirement depends, in the water to be purified. A further advantageous development of the invention is characterized in that by inoculating the water to be purified the course of the metabolic functions of the microorganisms, which are introduced, is set. After this the individual substrate parameters (as for example oxygen, carbon, nitrogen, phosphorus, pH value and/or temperature) and the changes resulting therefrom in the metabolic functions may be ascertained. Preferably, the water borne active substances set are filtered from the water. A further advantageous development is characterized
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Claudy Markus
Schnorr Karl-Ernst
Herhof Umwelttechnik GmbH
Morrison Betsey J.
Woo Jay H.
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