Biological treatment of dissolved organic matter by antarctic psychrophilic yeast cells

从南极洲万达湖5.0m水样中分离到8株酵母菌，对其鉴定及在有机物低温处理中的应用进行了研究。这些菌株是专性的嗜冷性和可发酵的许多糖，如葡萄糖和蔗糖。从形态、生理特征、辅酶Q系统（Q8）和G+C含量（53%）等方面分析，8株菌株均属于念珠菌属同一新种。菌株成功地降解了0和5‰的合成废水。孵育3 d后TOC、Kj-N和Total-P分别降低71.5 ~ 779、73.2 ~ 79.9和95.8 ~ 100%。Total-P被有效地去除。每TOC的生物量产量约为0.9，生物量中含有约42%的粗蛋白质。

Eight yeast strains were isolated from water samples as a depth of 5.0m in Lake Vanda in Antarctica and their identification and application for low temperature treatment of organic matter were investigated. These strains are obligate psychrophilic and fermentable for many sugars such as glucose and sucrose. It was concluded that the eight strains were classified into the same and a new species in the genus Candida from the view points of their morphological and physiological characteristics, coenzyme Q system (Q8) and G+C content (53%). The strain successfully degraded synthetic wastewater at 0 and 5ﾟC.The reduction of TOC,Kj-N and Total-P after 3 days of incubation was 71.5-79,73.2-79.9 and 95.8-100%, respectively. Removal of Total-P was efficiently observed. Production of biomass per TOC was about 0.9 and the biomass contained about 42% of crude protein.