棉籽油制备生物柴油的生物降解性能

以棉籽油甲酯、乙酯生物柴油及其与石化柴油形成的调和油为研究对象，采用改进的Sturm试验方法，考察了生物柴油及其调和油的生物降解特点。研究表明：在有氧的水环境中生物降解28 d，棉籽乙酯生物柴油与甲酯生物柴油生物降解率分别达99.7%和99.1%；对甲酯生物柴油而言，生物柴油体积分数为50%和20%的调和油的28 d生物降解率分别为93.8%和80.8%，而乙酯生物柴油体积分数为50%和20%的调和油的28 d生物降解率分别95.7%和81.9%，但在相同条件下，0#柴油生物降解率仅49.9%；生物柴油在调和油中体积比越大，调和油的生物降解速度越快，生物柴油对石化柴油的生物降解具有促进作用。该文对认识棉籽油生物柴油在环境中的消解规律，控制环境污染具有一定的意义。

Evaluation of biodegradability of biodiesel prepared from cotton seed oil

The biodegradabilities of biodiesels prepared from cotton seed oil via methyl or ethyl were investigated by the OECD 301B Modified Sturm Method. In aquatic aeration cultures, pure cotton seed oil methyl and ethyl esters biodegradability rates was 99.7% and 99.1%, respectively, after 28 days; Biodegradability rates of cotton seed oil methyl and ethyl esters in samples of B50 was 93.8% and 95.7%, respectively, after 28 days. Biodegradability rates of cotton seed oil methyl and ethyl esters in samples of B20 was 80.8% and 81.9%, respectively, after 28 days, but only 49.9% of fossil diesel was decomposed at the same condition. The more the cotton seed oil methyl and ethyl esters in mixtures were, the easier the biodegradability was. The biodegradability of the fuel mixture was enhanced by adding biodiesel. The research contributes to understand the decomposition characteristics of biodiesel via cotton seed oil, and also helps to control environment pollution.