Method and facility for treating effluents loaded with organic material, particularly by wet oxidation and with internal solid residue recycling, and purification facility therefor
First Claim
1. A method for the purification of industrial and/or urban effluents containing a substantial proportion of soluble organic matter and/or organic matter in suspension, comprising the acts of:
- treating said effluents in a wet air oxidation reactor within which said effluents are made to undergo an oxidation in the presence of at least one oxidizing gas so as to mineralize a major part of the organic matter contained in said effluents, the treating act producing, firstly, a gas phase and, secondly, an essentially liquid phase containing mainly soluble residual organic matter as well as an essentially mineral solid phase in suspension,separating the mineral solid phase in suspension from said essentially liquid phase resulting from the treating act to isolate said solid phase; and
recycling at least a fraction of said separated solid phase within said wet air oxidation reactor.
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Abstract
An integrated method for purifying industrial and/or urban effluents containing a large amount of organic material in solution and/or suspension, wherein said effluents are treated in a wet oxidation reactor. The effluents are oxidized in the presence of at least one oxidizing gas to mineralize a large part of the organic material therein by producing a gas phase and an essentially liquid phase mainly containing soluble residual organic material, as well as an essentially inorganic solid phase in suspension. The essentially liquid phase from the reactor is subjected to liquid/solid separation to separate the solid phase, and at least a fraction of the separated solid phase is recycled in the wet oxidation reactor. Various alternative embodiments of the method include adding a catalyst and/or an agent for acidifying the recycled solid phase fraction. The facility may operate continuously or semi-continuously between interruptions.
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Citations
25 Claims
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1. A method for the purification of industrial and/or urban effluents containing a substantial proportion of soluble organic matter and/or organic matter in suspension, comprising the acts of:
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treating said effluents in a wet air oxidation reactor within which said effluents are made to undergo an oxidation in the presence of at least one oxidizing gas so as to mineralize a major part of the organic matter contained in said effluents, the treating act producing, firstly, a gas phase and, secondly, an essentially liquid phase containing mainly soluble residual organic matter as well as an essentially mineral solid phase in suspension, separating the mineral solid phase in suspension from said essentially liquid phase resulting from the treating act to isolate said solid phase; and recycling at least a fraction of said separated solid phase within said wet air oxidation reactor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An installation for the purification of industrial and/or urban effluents containing a substantial proportion of soluble organic matter and/or organic matter in suspension, the installation comprising:
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a continuous wet air oxidation reactor for treating said effluents within which said effluents are made to undergo an oxidation in the presence of at least one oxidizing gas so as to mineralize a major part of the organic matter contained in said effluents to produce, firstly, a gas phase and, secondly, an essentially liquid phase containing mainly soluble residual organic matter as well as an essentially mineral solid phase in suspension; and a separator distinct from said reactor for separating the essentially mineral solid phase in suspension from the essentially liquid phase to isolate the solid phase; an inlet conduit connecting the reactor to the separator, the inlet conduit receiving the essentially liquid phase produced by the reactor and transferring the essentially liquid phase to the separator; and a return conduit connecting the separator to the reactor, the return conduit recycling at least a fraction of the separated solid phase to said reactor. - View Dependent Claims (23, 24)
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25. An installation for the purification of industrial and/or urban effluents containing a substantial proportion of soluble organic matter and/or organic matter in suspension, the installation comprising:
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a wet air oxidation reactor for treating said effluents within which said effluents are made to undergo an oxidation in the presence of at least one oxidizing gas so as to mineralize a major part of the organic matter contained in said effluents to produce, firstly, a gas phase and, secondly, an essentially liquid phase containing mainly soluble residual organic matter as well as an essentially mineral solid phase in suspension, the reactor further separating the essentially mineral solid phase in suspension from the essentially liquid phase to isolate the solid phase; and means for draining of the separated liquid phase and at least a first fraction of the separated solid phase from the reactor while retaining and recycling at least a second fraction of the separated solid phase within the reactor.
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Specification