好気性バイオフィルターにおけるジメチルホルムアミドの処理特性と微生物馴致過程の解析

抄録

The change of microbial phase in the course of acclimation to hard-biodegradable chemicals such as dimethylformamide (DMF), which is widely used as solvent and discharged from chemical industries, was analyzed on the basis of quinone profile in the aerobic biofilter to assure the optimal operating condition for the further improvement of their removal from wastewater. The microbial film cultivated by feeding the artificial wastewater containing glucose and peptone (GP wastewater, hereafter) was acclimated to DMF within 3 weeks after the onset of continuous feeding of DMF, and a remarkable change in the quinone profile was observed along with the acclimation. The predominant quinone of the microbial film cultivated on the GP wastewater was featured ubiquinone (Q)-8, and those on the mixture of GP wastewater and DMF and on DMF as a sole carbon source were MK-9 (H₂) and Q-10, respectively. The predominant bacteria in the film could be changed from the β-group of Proteobacteria, generally inhabiting the activated sludge, to the facultative C₁-using bacteria such as Mycobacterium and to the obligate C₁-using bacteria such as Methylobacterium along with the acclimation. Relationship between the removal efficiency of DMF and the change in quinone profile was clarified in the aerobic biofilter.