Process for reducing the biological and chemical oxygen demand of spent antibiotic fermentation broth
阅读：485发布：2021-12-11
专利汇可以提供Process for reducing the biological and chemical oxygen demand of spent antibiotic fermentation broth专利检索，专利查询，专利分析的服务。并且A process is provided for reducing the biological and chemical oxygen demand of spent antibiotic fermentation broth which comprises treating the aqueous fermentation broth with or without one or more chemical coagulating and viscosity adjusting agents, removing the suspended solids from such broth by a two step centrifugation procedure followed by a coalescing strainer, subjecting the effluent from such solids removal step to a pressure of from about 200 to about 500 psig and contacting such broth with a semi-permeable membrane adapted to restrict the passage of molecules having a molecular weight slightly below that of the molecular weight of the anitbiotic being processed. The antibiotic activity is concentrated and the permeate water flowing through such semi-permeable membrane has a biological and chemical oxygen demand of from about 0.2 to about 0.4 g. per liter, or less.，下面是Process for reducing the biological and chemical oxygen demand of spent antibiotic fermentation broth专利的具体信息内容。
1. A PROCESS FOR REDUCING THE BIOLOGICAL AND CHEMICAL OXYGEN DEMAND OF SPENT ANTIBIOTIC FERMENTATION BROTH COMPRISING: A. COMMINGLING A COAGULANT WITH AN ANTIBIOTIC ACITVITY CONTAINING FERMENTATION BROTH; B. PASSING THE BROTH FROM STEP (A) THROUGH A SOLIDS REMOVING MEANS; C. FLOWING THE BROTH FROM STEP (B) THROUGH A COALESCING STRAINER; D. ELEVATING THE PRESSURE ON THE BROTH FROM STEP (C) TO FORM ABOUT 200 TO ABOUT 500 PSIG; E. CONTACTING THE PRESSURE BROTH FROM STEP (D) WITH A SEMI-PEREABLE MEMBRANE ADAPTED TO RESTRICT THE FLOW THERETHROUGH OF MOLECULES HAING A MOLECULAR WEIGHT SLIGHTLY BELOW THAT OF THE MOLECULAR WEIGHT OF THE ANTIBIOTIC ACTIVITY CONTAINED IN SUCH BROTH; F. MAINTAINING THE CONTACT BETWEEN SAID PRESSURIZED BROTH AND SAID SEMI-PERMEABLE MEMBRANE UNTIL FROM ABOUT 80 TO 90 PERCENT OF THE VOLUME OF SAID BROTH PASSES THROUGH SAID MEMBRANE ESSENTIALLY FREE OF ANTIBIOTIC ACITVITY BECOMING PERMEATE;
2. The process according to claim 1 wherein the coagulant commingled with the antibiotic activity containing fermentation broth is selected from the group consisting of aluminum chloride, aluminum sulfate, or polyacrylonitrile.
3. The process according to claim 1 wherein the undissolved solids are separated from the antibiotic activity containing fermentation broth in a two step centrifugation operation under a force of from about 6,000 to about 9,000 Gs.
4. The process according to claiim 1 wherein the antibiotic activity containing fermentation broth from which the undissolved solids and coagulated colloids and gels have been removed is conveyed to the suction side of a high pressure pump and the pressure on such broth elevated to frOm about 200 to about 500 psig.
5. The process according to claim 1 wherein there is about a 5-to 10-fold concentration of the antibiotic activity in such broth in the reverse osmosis operation in which from about 80 to 90 percent of the volume of such fermentation broth permeates the semi-permeable membrane to become an essentially antibiotic activity free and low oxygen demanding permeate.
6. The process according to claim 2 wherein the semi-permeable membrane which is contacted by the antibiotic activity containing fermentation broth is comprised of a material selected from the group consisting of cellulose acetate, polyethylene, polypropylene, cellulose nitrate, polyacetate, and polyvinylacetate.
7. The process according to claim 1 wherein the semi-permeable membrane is adapted to restrict the flow of molecules having a molecular weight greater than 100.
8. The process according to claim 1 wherein the contact between the antibiotic activity containing fermentation broth and the semi-permeable membrane in the osmosis operation is conducted at a pressure of approximately 200 psig.
9. A process for reducing the biological and chemical oxygen demand of spent antibiotic fermentation broth comprising: a. commingling a coagulant selected from the group consisting of aluminum chloride, aluminum sulfate, or polyacrylonitrile with an antibiotic activity containing fermentation broth; b. separating the undissolved solids contained in the broth from step (a) by a two step centrifugation operation operated at from about 6,000 to about 9,000 gs; c. separating the coagulated colloids and gels from the broth from step (b) by passing such broth through a coalescing screen; d. conveying the broth from step (c) to the suction side of a high pressure pump and therein elevating the pressure on such broth to from about 200 to about 500 psig; e. conveying the pressurized broth from step (d) to a reverse osmosis operation wherein such broth is contacted with a semi-permeable membrane which is adapted to restrict the passage therethrough of molecules having a molecular weight greater than 100; f. maintaining the contact between said pressurized broth and said semi-permeable membrane until the antibiotic activity in such broth is concentrated from about 5- to about 10-fold and from about 80 to about 90 percent of the volume of said broth has permeated said membrane to become an essentially antibiotic activity and low oxygen demanding free permeate; g. extracting the antibiotic activity from the concentrated broth from step (f) by commingling such broth with a water-immiscible partitioning solvent; h. separating the antibiotic activity containing solvent from the extracted fermentation broth from step (g) by a decantation step followed by a centrifugation operation under a force of 6, 000 gs on the solvent to remove the entrained water from such solvent and commingling such water with that separated in the decantation step; i. conveying the spent broth from step (h) to the suction side of a high pressure pump and therein elevating the pressure of such spent broth to from about 200 to about 500 psig; j. contacting the pressurized broth from step (i) with a semi-permeable membrane as described in step (e); k. maintaining a contact between said pressurized broth and said semi-permeable membrane as in step (f); and l. commingling the permate from steps (f) and (k) for reuse or further treatment before discharge into the environment.
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