Liquid purification or separation – Processes – Treatment by living organism
Patent
1986-10-31
1989-04-25
Castel, Benoit
Liquid purification or separation
Processes
Treatment by living organism
210194, 210614, 210219, 210220, 435167, 435267, C02F 328, C12P 502
Patent
active
048245712
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention has for its object a method and an equipment for carrying out the degradation of organic products, by-products and scraps of human, animal or vegetable origin. More specifically, the subject matter of the invention is a process and an improved plant for performing a continuous methanizing of solid and/or liquid organic compounds.
In the European patent application EP-A-0074290 of the applicants, there has been described a method for carrying out a degradation in an anaerobic medium, for instance of methanogenesis of organic products, by-products or scraps of human, animal and/or vegetable origin, consisting in feeding the products to be degraded into a closed vessel after having possibly sowed the products with a suitable substrate, imposing upon the said products a direction of circulation within the vessel, recovering the gas produced called biogas evolved above the body of products and discharging the degraded products. This process describes various means for obtaining a pneumatic thrust of the substrate and a homogenization of the latter to accomplish a directed forced circulation and a good fluidizing thereof.
These means comprise feeding or discharging the products pneumatically preferably, through siphons by a pneumatic thrust; inducing sudden variations in pressure of the gas contained within the closed vessel in combination with a reintroduction of the biogas into the body of products present in the vessel.
In the method forming the subject matter of the European patent application EP-A-0074290, there has also been described a blowing of biogas by means of biref and successive jets through ducts opening into the bottom of the fermentation tank. Thus was carried out a simultaneous injection of gas into the whole bottom of the fermentation tank through the intermittent emission of brief jets. It appeared now during additional searches that this simultaneous blowing into the whole fermentation vat by means for time-bound short and successive jets did not lead to the desired result so that the fluidizing often was not perfect. It could moreover be found during these searches that the density of the substrate would vary from the feed shaft to the discharge shaft in such a manner that a uniform injection of biogas throughout the fermentation vat is inadequate because it does not at all take into account this difference in density.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to remove the inconveniences of the method and the equipment forming the subject matter of this prior european application EP-A-0074290.
Thus, according to the present invention there is provided a method of the type previously described concerning the document EP-A-0074290, characterized in that one subdivides the vessel into a plurality of sectors; and in that one intermittently injects biogas into each one of the sectors under a pressure and for a period of time which are predetermined, adjustable in accordance with the density of the products within the sector.
Thus, according to the present invention, one adapts the biogas injection pressure and the duration of the injection in accordance with the instant density of the solid products or of the substrate within the injection sector. One therefore understands easily that one obtains with the invention a perfect fluidizing of the products during their circulation in the fermentation tank.
On the other hand, according to an advantageous characteristic of the method of the invention, one reintroduces biogas into each sector successively, that is in a manner shifted in time so as to obtain a rotation of the biogas injection within the vessel from one sector to another one. This rotation may be regular or irregular.
According to a particular characteristic of the method according to the invention, one provides a biogas storage tank under high pressure upstream of the fermentation vessel, the pressure being at least equal to the injection pressure in the sector where the density of the products is the
REFERENCES:
patent: 3210053 (1965-10-01), Boester
patent: 3808123 (1974-04-01), Neel
patent: 4437992 (1984-03-01), Saito et al.
patent: 4663046 (1987-05-01), Feldkirchner
patent: 4780415 (1988-10-01), Ducellier et al.
Ducellier, deceased Gilbert
Pavia Andre
Castel Benoit
Ducellier Lucienne
Ducellier Veronique
Ducellier nee Richert Renee
Fabres nee Ducellier Michele
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