Chemistry: fertilizers – Processes and products – Bacterial
Patent
1986-11-26
1990-03-20
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Bacterial
71 10, 71 21, 422184, C05F 300, C05F 306
Patent
active
049098250
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process and an apparatus for drying and conditioning chicken manure or similar pasty substances by the use of carrier materials employed as heat carriers and as carriers of micro-organisms.
TECHNOLOGY REVIEW
The state of the art of drying pasty substances is as follows:
Pasty substances which can be pumped or sprayed, are dried in spray driers on a cushion of air. In the case of substances that cannot be pumped, costly spraying systems must be used. In addition, contact layer dryers, most of which are indirectly heated, can also be employed. These processes are operated with hot gas or with heat carrier materials and operate at normal atmospheric pressure.
Coarse vacuum dryers are also used for substances that are temperature sensitive.
All of the processes described above are complicated with respect to design and operation; they require large amounts of investment capital and consume large quantities of both heat and energy. Furthermore, as a rule, the dried end products require subsequent processing such as granulation, for example, before they can be placed on the market.
It is the object of the process according to the present invention to dry granulated, pelletized or chipped pasty substances with the least amount of energy, by means of micro-organisms that are concentrated on carrier elements, with a small portion of the available organic or even inorganic substances being converted by the micro-organisms into carbon dioxide, heat and residual substances. Very frequently, these organic substances are not desired in the end product since they produce an unpleasant odor and limit the shelf life of the dried end product. Finally, the dried product should emerge from the drying process in granular form and thus be ready for marketing.
The process according to the invention will be described below using chicken droppings as an example, although the invention is in no way limited to this application. As a consequence of a world-wide tendency to once more use biological fertilizers, attempts are being made to process chicken droppings from large-scale animal holdings so that they can be readily stored and also sold in supermarkets. In this connection, it is important that their water content be reduced to less than 15%, that the product be sterilized so as to destroy all hazardous bacteria, and that the odor be reduced to a point where it has no unpleasant effect on the environment.
Today, the state of the art is such that the droppings are either dried in the sun, if the climate permits, and are then sterilized and rendered odor-free in a drum-type drier heated by means of oil burners. Belt type driers can also be used in place of a drum-type drier. Attempts have also been made to perform these operations by means of indirect driers, such as, for example, tube-type driers, but these resulted in operational malfunctions due to clogging. Furthermore, processes and apparatus have been proposed for the production of fertilizers from organic wastes, particularly from animal manure, in which the manure is subjected to biological decomposition and is then dried.
In all of these known processes, two problems are encountered, namely, on the one hand, a considerable odor pollution of the environment and, on the other hand, the problem of energy costs. The cost for drying with heavy furnace oil account for up to 40% of the total costs of the process.
SUMMARY OF THE INVENTION
These drawbacks of the prior art processes can be overcome by the process according to the invention which provides a process for drying and conditioning chicken manure or similar pasty substances having an organic fraction and being available in stranded, chipped, granulated, pelletized or fiber form which, upon being mixed with organic or inorganic, molded, stable materials results in a loose, air permeable pile of material. The process according to the invention is characterized in that it is carried out in two phases, a microbiological phase followed immediately by flow-through
REFERENCES:
patent: 2660809 (1953-12-01), Morrison
patent: 3697056 (1972-10-01), Prins, Sr. et al.
LandOfFree
Process and apparatus for drying and conditioning chicken manure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and apparatus for drying and conditioning chicken manure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and apparatus for drying and conditioning chicken manure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-790435