几种芳香化合物对苯并芘在泥浆反应器中降解的影响

Effects of Aromatics on the Degradation of Benzo(a)pyrene in Slurry Reactors

苯并芘在土壤中难于被生物降解 ,其降解方式通常以共代谢方式进行 .本研究考查了几种多环芳烃及 2种单环芳香化合物对苯并芘降解的影响 .先把几种芳香化合物投入到供试无污染土壤中进行 3d的预培养 ,然后向土壤中加入苯并芘并使土壤在三角瓶内形成泥浆系统 ,放在摇床上培养 .42d的实验表明 ,用菲对土壤进行预处理消除了苯并芘的降解滞后期 ,并提高了苯并芘的降解率 .蒽、芘未能改变苯并芘的降解模式 ,而苯并蒽则相对抑制了苯并芘的降解 .水杨酸和邻苯二甲酸同样消除了苯并芘降解的滞后阶段 ,且促进了苯并芘的降解 ,但质量差别未对苯并芘的降解产生影响 .

Benzo(a)pyrene (BaP) can't be biodegraded in the soil easily, the degradation of BaP is know as a cometabolic process.This paper dealed with the effects of some polycyclic aromatic hydrocarbons (PAHs) and two kinds of monoaromatics on the degradation of BaP.The test soil was pre incubated with the aromatics for 3d and spiked with BaP stock solution, which eventually formed into slurry system in Erlenmeyer flasks and was incubated on rotary shaker.42 d experiment demonstrated that lag period in degradation process of BaP disappeared due to the preexposure to phenanthrene, and degradation rate of BaP was enhanced.On the contrary, degradation pattern of BaP was not obviously improved by the preexposure to anthracene or pyrene, and was even inhibited by benz(a)anthracene.The lag period also disappeared after the preexposure to salicylic acid or phthalic acid, and the degradation of BaP was accelerated by both monoaromatics, even though the impact of mass difference on the degradation of BaP was not detected.