Abstract: The present invention belongs to the field of sewage treatment, and relates to a method for preparing a modified natural wood material and an application thereof in sewage treatment. The method for preparing the modified natural wood material includes the following steps: S1. placing wood into a lignin removal solution, after a heating reaction, washing, impregnating, and lyophilizing the wood to obtain removed lignin wood; S2. blending TiO2 with NaBH4, performing low-heat reduction treatment, and then washing and drying to obtain reduced black titanium; S3. dispersing the reduced black titanium ultrasonically in a solvent, then coating dropwise on the removed lignin wood, and drying to obtain a modified natural wood material. The modified natural wood material prepared by the present invention has high disinfection and sterilization performance, and has the ability to remove bio-risk components.

Abstract: The present invention relates to a method for promoting growth of gas-fermented microorganisms, comprising the following steps: S1. ultrasonically blending a surfactant and a culture medium, then adding a fluorine-containing alkyl compound to a mixture, and ultrasonically processing the mixture to obtain a perfluorocarbon nanoemulsion; S2. inoculating a bacterial suspension into the perfluorocarbon nanoemulsion, and introducing simultaneously a mixed gas to obtain a precursor; S3. cultivating the precursor in a shaker, wherein the precursor has a diameter of bubbles of 2.0-4.2 mm, and the bubbles have the total volume of less than 40 ml. Under these conditions, the microorganisms have a high utilization rate of the gas, can grow and metabolize more quickly, and can obtain bacteria and products more quickly. Compared with a traditional culture system, addition of a mass transfer material can promote gas mass transfer. Therefore, the gas consumption is small, and the cost is low.