Liquid purification or separation – Processes – Treatment by living organism
Patent
1987-08-04
1988-09-06
Castel, Benoit
Liquid purification or separation
Processes
Treatment by living organism
210180, 71 10, 71901, 48197A, C02F 1104, C05F 700, C05F 900
Patent
active
047691492
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process for total recovery of residues and waste of various origins, particularly residues of industrial or agricultural origin or urban refuse of the household garbage type.
SUMMARY OF THE INVENTION
The process according to the invention allows recovery of these by-products with production of energy, in particular in the form of combustible gas, and of thermal energy and with the obtaining of a product with added high value of the organo-mineral improvement or fertilizer type, and this without any rejection into the environment of polluting residues in the liquid, solid or gaseous state.
To that end, the invention relates to a process for recovery and exploitation of residues or rejects of industrial, agricultural or urban origin, with a view to extracting the potential energy therefrom, and characterized in that the residues, after sieving and separation of the fines, are subjected to an operation (known per se) of bacterial digestion in a methanization reactor with a view to producing a stored combustible gas, and in that the solid phase of the digestate coming from the preceding operation, after fresh sieving and separation of the fines, is subjected to incineration in a furnace in order to produce thermal energy recovered in at least one heat recuperator, the respective two steps of bacterial digestion and of incineration being joined together so that at least one of the two steps uses at least partially the production of energy of the other step, enabling the conditions of operation of the receiving step to be optimized.
Within the scope of embodiment of the process according to the invention, the waste is thus subjected to a first step of digestion with a view to producing combustible gases and to a subsequent step of incineration with a view to producing thermal energy.
For example, and in accordance with an important feature of the invention, there is used in the incineration phase, the energy of the combustible gas produced in the preceding methanization phase and, to this end, there is injected into the incineration furnace a quantity of combustible gas for the purpose of regulating the conditions of production of thermal energy during the incineration phase.
In particular, the injection of gas into the incineration furnace is modulated as a function of the regime of instantaneous operation of the furnace, depending on the calorific characteristics of the solid fuel which supplies it, the complementary supply of the combustible gas thus being called upon to compensate the momentary irregularities or deficiencies in calorific power of the principal combustible, so as to obtain a substantially constant thermal regime and an optimum post-combustion of the combustible elements supplying the furnace.
However, according to the invention, the synergy may operate in both ways and in the same way as the incineration phase is optimalized by taking part of the energy and the products derived from the preceding methanization phase, this first methanization phase is itself optimalized thanks to the particularly calorific supply taken from the incineration phase.
In this way, the thermal energy produced in the incineration phase is used for heating the magma in the course of digestion in the methanization reactor and for optimizing production of combustible gas.
According to another feature, the thermal energy produced in the incineration phase is used for obtaining concentration of the sludge and liquors coming from the separation of the solid phase of the digestate, with a view to recycling thereof.
In addition, in order to obtain total recovery of the residues and waste, the invention allows production of a by-product of value, constituted by the solid particles adapted to form a substrate for agricultural or other use.
And to this end, the fines coming from the initial separation of the residues, then from the separation of the solid phase of the digestate, are mixed with the combustion ashes and with a solid phase coming from decantation
REFERENCES:
patent: 1892681 (1933-01-01), Rankin
patent: 3577229 (1971-05-01), Bruck
patent: 4028087 (1977-06-01), Schultz et al.
patent: 4076515 (1978-02-01), Rickard
patent: 4198211 (1980-04-01), Shattock
patent: 4369194 (1983-01-01), Arsovic
patent: 4632758 (1986-12-01), Whittle
Bonhomme Michel
Desplat Philippe
Nobilet Bernard
Castel Benoit
Propiorga
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