共基质条件下脱氮副球菌W12对吡啶的降解  

Biodegradation of pyridine with co-substrates by Paracoccus denitrificans W12

作　　者：熊瑞林[1] 陈吕军[1] 刘江江[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第6期842-845,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术研究发展计划项目(2004AA6490902006AA06Z336)

摘　　要：为了研究难降解有机物在共基质条件下的生物降解性能,从实验室的废水生物处理反应器内采集活性污泥样本,以吡啶为唯一碳、氮源筛选出来一株脱氮副球菌(Paracoccus denitrificans)W12,选择3种共基质:葡萄糖、苯酚和喹啉,研究了W12分别在这种基质中对吡啶降解的影响。结果表明:葡萄糖对吡啶的降解具有促进作用,但其促进作用存在一个最优点,过高浓度的葡萄糖不促进降解,甚至会减慢吡啶的降解。苯酚对吡啶的生物降解有抑制作用,且随着苯酚浓度的增大而增大。喹啉对吡啶的生物降解也有抑制作用,且随着喹啉的增大而增大,但W12在单基质和共基质下均不能降解苯酚和喹啉。A bacterial strain, W12, that utilizes pyridine as the sole source of carbon and nitrogen was isolated from an activated sludge reactor and identified as the species Paracoccus denitriflcans for biodegradation of refractory organics with co-substrates. The biodegradation of pyridine by the Paracoccus denitrificans W12 was studied using three organic co substrates, glucose, phenol, and quinoline. The results indicate that glucose promotes pyridine degradation with an optimal glucose concentration after which the degradation rate decreased. Phenol and quinoline inhibited pyridine degradation,with the inhibiting effect enhanced as the phenol or quinoline concentrations increased. The W12 did not consume the phenol or the quinoline in the presence of pyridine.

关 键 词：吡啶 共基质 脱氮副球菌 生物降解 

分 类 号：X172[环境科学与工程—环境科学]