Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1997-10-14
1999-06-22
Hruskoci, Peter A.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210639, 210650, 210713, 210721, 210727, 210728, 210730, 210734, 210905, 210906, 210916, C02F 156
Patent
active
059140402
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the purification of a medium containing organic waste.
It also relates to the application of the said process to the treatment of organic dejecta, in particular liquid animal manures, especially liquid pig manure.
It also relates to the application of this process to the treatment of other effluents, such as the effluents arising from the production of olive oils and the effluents arising from the production of wine (for example, the waste water resulting from the cleaning of wine vats).
The treatment of waste, in particular of organic type, for the purpose of removing it and/or of recovering it, is a requirement which is becoming increasingly felt in the industrial and agricultural world of today.
Thus, the high production of waste water of agricultural origin, in particular from liquid animal manures, poses increasingly severe problems in agriculture and also in the protection of the natural environment, in particular of water courses. Increasingly strict regulations are in place in order to prevent the highly negative effects of pollution of water courses due to various liquid animal manures.
A certain number of treatment processes have been proposed.
It is known to treat liquid animal manures by aerobic biological fermentation in order to provide for oxidation of the malodorous sulphur-containing combinations.
It is also known to treat fermentable and malodorous waste using oxidizing agents.
It has already been proposed to sterilize municipal waste using gas containing nitrous gases.
Likewise, the possibility of destroying the putrid compounds contained in household refuse by means of gas containing nitrogen oxides has been mentioned in the past.
Nevertheless, these processes for the purification of a medium (or effluent) containing organic waste do not give entirely satisfactory results from a technical and even economic viewpoint.
This is in particular the case for purification treatments for liquid animal manures in conventional total oxidation plants.
Likewise, the drying of complete liquid manure by evaporation of the water which it contains is not economically viable, causes air pollution and is troublesome to the sense of smell.
The known processes for the purification of a medium (or effluent) containing organic waste also have the disadvantage of not treating all of this waste but only certain kinds of waste. Moreover, not all waste can be recovered.
The present invention intends in particular to solve the abovementioned disadvantages.
With this aim, the present invention proposes to provide a process for the purification of a medium (or effluent) containing organic waste, in which the said medium is subjected to a combination of specific chemical, physical or physicochemical treatments, all the organic waste contained in this medium being treated and, preferably, no unrecovered waste remaining on conclusion of the process, which process is simple and economic to implement.
Moreover, the discharge to the natural environment (water courses, irrigation, and the like) of the aqueous part of the effluents treated according to the invention becomes possible because it is advantageously odourless, clear, sterile and relatively depleted in BOD (biological oxygen demand) and COD (chemical oxygen demand).
Finally, the process according to the present invention makes it possible, in particular in the case of the treatment of liquid animal manures (in particular liquid pig manure), to obtain sludges which can be spread directly, that is to say which can be used directly as agricultural fertilizer without it being necessary to add fertilizing adjuvants thereto.
Thus, the main subject of the invention is a process for the purification of a medium containing organic waste, characterized in that it comprises an oxidation treatment (in particular of chemical type), a flocculation treatment, a treatment using a polyelectrolyte (in particular of the anionic or cationic type), a filtration and, preferably, an ultrafiltration.
Another subject of the invention consist
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Bonfill Jean
Castelas Bernard
Danda Sylvain
Morales Jose
Pescher Yvette
Carleton Katherine L.
Hruskoci Peter A.
Rhone-Poulenc Chimie
Seugnet Jean-Louis
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