66results about How to "Uniform degradation" patented technology

The invention belongs to the field of environment protection and discloses a membrane bioreactor for denitrification and waste water denitrification method thereof. The membrane bioreactor is divided into a first anoxic pond, an aerobic pound, a second anoxic pound, an anaerobic pond and a membrane pound by a vertical deflecting baffle plate and an aeration device, wherein the ponds are five independent and communicated reactor chambers; after waste water enters the process, the biochemical treatment processes such as the degradation, nitrification and denitrification of organic matters are completed under the action of microorganisms; and effluent is obtained by membrane filtration and pumping. The bioreactor and the method have the advantages that: sludge mixed liquid flows in a piston flow mode in the whole system, but is in a fully mixed state in a single cell and a refluxing device is used, so the degree of mixing in the entire reactor is high and the mass transfer effect is good; under a condition of not adding extra carbon source, the process strengthens the denitrification by using high sludge concentration, so deep denitrification treatment is realized and the pollution to the membrane is relieved; and at the same time, due to the high efficiency trapping and separation characteristic of the membrane, the quality of effluent of filtration is high.

The invention relates to a preparation method of a fibroin microsphere, and the fibroin microsphere can be taken as a carrier of medicaments for slow release. At present, there is not a preparation method of a demand-satisfying fibroin microsphere; and wherein the demands are that the fibroin microsphere has high embedding efficiency, and the medicament can be released slowly and uniformly along with the degradation of the prepared fibroin microsphere. The preparation method comprises the following steps: adding the medicament needing to embed and release into a regenerated fibroin solution with a concentration of 3-10 wt%, then dropwise adding a coagulating agent with a concentration of 2-10 wt%, and slowly stirring at a rotary speed of 80-120 r / min to obtain a mixed solution; spraying the mixed solution into a space with a temperature of -20 DEG C to -80 DEG C and coagulating, collecting icy particles, continually preserving the icy particles in a space with a temperature of -20 DEG C to -80 DEG C for more than 2 hours, then unfreezing the icy particles at 0 DEGC to room temperature, washing and removing the coagulating agent at 0 DEG C to room temperature, collecting the fibroin microsphere by centrifuging or filtering. The fibroin microsphere prepared by the method is high in embedding efficiency and excellent in biological compatibility, and the medicament is released slowly and uniformly along with the degradation of the fibroin microsphere.

The invention provides a degradable film preparation process, comprising the following steps: (1) Preparation of photodegradable masterbatch: drying the photosensitizer for 0.5-1h, drying the dried photosensitizer, dispersant, polypropylene resin, antioxidant, Mix and granulate hydrophobic agent and lubricant to prepare photodegradable masterbatch; (2) Preparation of starch-based degradable masterbatch: dry starch for 0.5-1h, mix and stir dried starch and coupling agent evenly to prepare starch mixture, Then mix and granulate the starch mixture with polypropylene resin and plasticizer to obtain starch masterbatch; (3) preparation of degradable film: mix photodegradable masterbatch and starch masterbatch and dry for 0.5-1h, then dry the dried The photodegradable masterbatch and starch masterbatch are kneaded at high speed in a high-speed kneader to obtain a blow molding masterbatch, and the blow molding masterbatch is blow molded to obtain a degradable film. The process is simple and the cost is low, and the prepared degradable film has good mechanical properties, high degradation rate and uniform degradation.