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环境化学

Effect of particles on the biodegradation of PAHs in natural waters—A study for the Yellow River

基金项目：国家自然科学基金资助项目(No.40201046);国家自然科学基金委员会、水利部黄河水利委员会黄河联合研究基金项目(No.50239010);水资源与水电工程科学国家重点实验室开放基金(No.2003B004)

摘要：以典型的多泥沙河流黄河为例,采用微宇宙实验模拟研究水体中多环芳烃、苯并(a)芘和苯并(g,h,i)的自然生物降解过程.结果表明,颗粒物对体系中各种多环芳烃的生物降解均有一定的促进作用;可用不支持微生物生长的基质动力学降解模型对降解过程进行模拟,降解速率常数随颗粒物含量的增加而增加.对于颗粒物含量分别为0、4和10g·L^-1的水体,当的初始含量为3.8μg·L^-1时,其降解速率常数K^-1分别为0.053、0.083和0.102d^-1.水体颗粒物对多环芳烃生物降解速率的影响机制主要包括以下几方面:(1)颗粒物的存在使水体多环芳烃主要存在于颗粒相;(2)颗粒物的存在促进了微生物的生长,且微生物主要存在于颗粒相;(3)整个体系中多环芳烃的降解主要发生在水颗粒相界面.

Abstract：The biodegradation of chrysene, benzo(a)pyrene and benzo(g,h,i)perylene in natural water of the Yellow River has been studied using microcosms-experiments with both water and solid phases coexisting. The results indicated that the existence of particles in the water system could stimulate the biodegradation of PAHs. The model for the kinetics of biodegradation of organic compounds not supporting growth has been applied to analyze the biodegradation of PAHs; the biodegradation rate constants of PAHs increased with the particle content. When the particle contents were 0g·L^-1,4g·L^-1 and 10g·L^-1, the biodegradation rate constants of chrysene with the initial concentration of 3.8μg·L^-1 were 0.053d^-1,0.083d^-1 and 0.102d^-1, respectively. The mechanism regarding the effect of particles on PAHSbiodegrodation includes the following aspects: (1) most of PAHs exist on the particle phase; (2) the existence of particles stimulates the growth of PAHs-bacteria and most of them are attached to the particles; (3) the biodegradation of PAHs in the water system mainly occurred on the interface between water and particles.