链格孢菌对库存喷气燃料性质的影响

Effect of Alternaria alternata on the properties of stock jet fuel

研究链格孢菌在生长过程中对库存喷气燃料总酸值等性质的影响。以菌丝干重为指标,通过三因素三水平正交试验,筛选了链格孢菌最佳培养条件;构建喷气燃料、培养基、菌液培养体系,研究了链格孢菌生长繁殖对喷气燃料总酸值以及银片腐蚀试验、水反应试验、表面张力等的影响;构建以喷气燃料替代物十二烷为唯一碳源的培养体系,通过气相色谱检测十二烷残留率,研究了链格孢菌生长繁殖与十二烷的降解特征。链格孢菌最佳培养条件为30℃、初始pH为8、钠元素浓度为0;链格孢菌在生长繁殖过程中,能产生酸性物质,增加喷气燃料总酸值、降低水相pH,能产生表面活性物质,降低喷气燃料表面张力、水相表面张力,但培养周期内对银片腐蚀试验、水反应试验无显著影响;链格孢菌能以十二烷为唯一碳源进行生长繁殖。链格孢菌在生长繁殖过程中,能增加喷气燃料总酸值,降低喷气燃料、水相表面张力以及水相pH。

The objective of this study was to research the effect of Alternaria alternata on the total acid value and other properties of stock jet fuel during growth. With the dry weight of mycelium as the index,the optimal culture conditions of Alternaria alternata were selected by three-factor and three-level orthogonal experiments. The jet fuel, medium and fungus culture system were constructed to study the effects of Alternaria alternata growth and proliferation on the total acid value of jet fuel, the silver sheet corrosion test, water reaction test, and surface tension, etc. The culture system with dodecane as the sole carbon source was constructed and the residual rate of dodecane was detected by gas chromatography to study the growth and reproduction of Alternaria alternata and the degradation characteristics of dodecane.The optimal culture conditions of Alternaria alternata were 30℃, the initial pH was 8, and the sodium concentration was 0 mg/L. With acidic substances and surface-active substances produced, the total acid value of jet fuel was increased, and the aqueous pH, the surface tension of jet fuel and water were reduced during Alternaria alternata growth and reproduction. Alternaria alternata could grow and multiply with dodecane as the sole carbon source. It was concluded that in the process of growth and reproduction,Alternaria alternata could increase the total acid value of jet fuel, reduce the surface tension of jet fuel,water phase and the aqueous pH.