摘要:
There are disclosed a bioreactor carrier comprising a (A) water swellable thermoplastic resin, preferably water swellable thermoplastic polyurethane resin and a (B) specific inorganic filler which is added thereto at the time of producing and/or molding said resin, characterized in that the specific gravity of the carrier on swelling in water is controlled within the range of 1.02 to 1.35; a process for producing the bioreactor carrier; and a process for denitrifying treatment of organic waste water which comprises nitrifying and denitrifying nitrogen components in the organic waste water with microbes by the use of the above bioreactor carrier. The bioreactor carrier has high physical strength, can be readily produced and uniformly fluidized in a reactor, and enables microbial and enzymatic reactions to be effectively performed.
摘要:
A bioreactor carrier is provided which is a thermoplastic organic high molecular compound having a swelling rate of volume in water of 150-4,000% and which is useful as a carrier to which animal cells, plant cells, microorganisms and/or protozoans are fixed to obtain a bioreactor for substance production, harmful substance treatment, waste oil treatment, wastewater treatment, deodorization or the like. A method of producing the carrier includes the steps of reacting long-chain and short-chain polyol compounds and an isocyanate compound to obtain a thermoplastic resin, heating the thermoplastic resin to its melting temperature thereby plasticizing it, extruding the plasticized resin into strands with an extruder, and continuously chopping the strands into pellets.
摘要:
There are disclosed a bioreactor carrier comprising a (A) water swellable thermoplastic resin, preferably water swellable thermoplastic polyurethane resin and a (B) compatible resin with the resin as the component (A), and as the case may be, a (C) inorganic filler, characterized in that the degree of volumetric swelling of said carrier is controlled within the range of 120 to 3000%, and that the specific gravity of said carrier on swelling in water is controlled within the range of 1.02 to 2.12; a process for producing the bioreactor carrier; and a process for denitrifying treatment of organic waste water which comprises nitrifying and denitrifying nitrogen components in the organic waste water with microbes by using the above bioreactor carrier. The bioreactor carrier has high physical strength, can be readily produced and uniformly fluidized in a reactor, and enables microbial and enzymatic reactions to be effectively performed.
摘要:
A water-insoluble, nonionic water-absorptive polyurethane fiber that combines the properties of high water absorptivity and excellent physical strength is produced by extrusion from a thermoplastic polyurethane resin composition at a temperature higher than its melting point. The thermoplastic polyurethane resin composition, which has a water absorption rate within the range of 200-3,000%, is obtained by reacting a polyisocyanate compound, a water-soluble polyalkylene ether polyol having a weight-average molecular weight of 2,000-13,000 and a chain extender at an equivalent ratio (R ratio) between the equivalent number of NCO groups and the equivalent number of OH groups in the range of 1.0 to 1.8. Also provided is a method of producing the water-absorptive polyurethane fiber.
摘要:
There is disclosed a process for nitrifying denitrifying organic waste water to nitrify and denitrify the nitrogenous components in the waste water, which comprises making use of a microbe carrier composed of an organic thermoplastic high molecular compound (thermoplastic polyurethane) in both a nitrifying step and a denitrifying step, preferably in an alternate and repeated manner, wherein the compound has, in a state of complete swelling in water, a water absorption rate in the range of 50 to 3500%, a compressive yield stress of at least 1.0 MPa each being defined by a specific formula, and a particle diameter in the range of 1.0 to 30 mm. The process is capable of efficiently performing nitrifying and denitrifying steps, steadily achieving high treatment performances, contriving compactification of the treatment facility, and curtailing the treatment time and treatment cost, while the microbe carrier can withstand long-term service without any trouble.
摘要:
A bioreactor carrier is provided composed of a water absorption gel of a crosslinked N-vinylcarboxamide resin which has a great moisture content and excellent physical strength, is not eroded by microorganisms and is easily mass-produced on an industrial scale. The gel is obtained by swelling and gelling a crosslinked N-vinylcarboxamide resin made from an N-vinylcarboxamide such as N-vinylacetoamide. The swollen gel may be in the form of beads of 1.0 to 20 mm, and the resin when swollen with water has a water absorption coefficient of 500 to 3500%. Resin beads may be swollen in a suspension of a biocatalyst such as animal cells, plant cells, microorganisms or protozoans to bind and immobilize the biocatalyst to form a bioreactor. The microorganisms can be nitrate bacteria, denitrification bacteria or Hyphomycetes, and the bioreactor may be used to treat waste water or for deodorizing. The crosslinked N-vinylcarboxamide resin contains a repeating unit shown by formula (A) below crosslinked with a crosslinking agent. ##STR1## wherein R.sup.1 and R.sup.2 represent independently a hydrogen atom or a methyl group.
摘要:
A bioreactor carrier is provided using an organic polymer substance having a water absorptivity of 50 to 1,700%, and containing an inorganic salt, organic nitrogen source and/or organic carbon source utilizable as a nutrient by animal cells, plant cells and/or microorganisms which fix to the carrier for uses such as substance production, harmful substance treatment, waste oil treatment, wastewater treatment and deodorization. A preferred polymer substance is a water swellable thermoplastic polyurethane gel having the water absorptivity and a swelling rate of volume of 150 to 4,000%. The polyurethane gel is obtained by reacting together a long-chain diol compound, a short-chain diol compound and a diisocyanate compound. The long-chain diol compound has a number-average molecular weight of 400 to 10,000, and is selected from an ethylene oxide-propylene oxide copolymer having an ethylene oxide content not less than 70% and a polyethylene glycol. The short-chain diol compound has a number-average molecular weight of 30 to 400. The diisocyanate compound has a number-average molecular weight of 100 to 1,000 at an NCO/OH equivalency in the range of 1-5. Microorganisms multiply rapidly at the surface and interior of the carrier. Preferred adherence and proliferation of desired microorganisms is possible by appropriately selecting substances incorporated as microorganism nutrients.
摘要:
To provide a sheet for ink-jet recording having a low ink-spreading property and an excellent sheet-feeding property, a sheet for ink-jet recording which comprises a base material taking the form of sheet and an ink receiving layer which is laminated onto at least one surface of the base material and contains a binder and fine porous polysaccharide particles is produced. Further, the above-mentioned sheet for ink-jet recording wherein the fine porous polysaccharide particles are exposed on the surface of the ink receiving layer to form unevenness thereon is produced.
摘要:
A composite particle that can be easily converted to cured particle or half cured particle by the use of carbodiimide resin without changing of the configuration of matrix particle of, for example a thermoplastic resin, excelling in mechanical and functional characteristics by virtue of the reaction capability inherently possessed by a carbodiimide group. In particular, a composite particle comprising matrix particle (A) having a functional group capable of reacting with a carbodiimide group and carbodiimide resin (B), characterized in that the functional group of the matrix particle (A) couples with the carbodiimide group of the carbodiimide resin (B) and that the composite particle is provided with an outer shell layer of carbodiimide resin (B) having an average thickness diameter (L), defined by the following formula [1], ranging from 0.01 to 20 μm: L=(L2−L1)/2 [1] wherein L1 represents the average diameter of matrix particle, and L2 represents the average diameter of composite particle.
摘要:
A composite particle that can be easily converted to cured particle or half cured particle by the use of carbodiimide resin without changing of the configuration of matrix particle of, for example. a thermoplastic resin, excelling in mechanical and functional characteristics by virtue of the reaction capability inherently possessed by a carbodiimide group. In particular, a composite particle comprising matrix particle (A) having a functional group capable of reacting with a carbodiimide group and carbodiimide resin (B), characterized in that the functional group of the matrix particle (A) couples with the carbodiimide group of the carbodiimide resin (B) and that the composite particle is provided with an outer shell layer of carbodiimide resin (B) having an average thickness diameter (L), defined by the following formula [1], ranging from 0.01 to 20 μm: L=(L2−L1)/2 [1] wherein L1 represents the average diameter of matrix particle, and L2 represents the average diameter of composite particle.