中文摘要：

沿湖泊沉积物垂直高度取表层（SL,0～2cm）、中层（ML,14～16cm）、底层（BL,28～30cm）3层底泥微生物为对象,研究了湖泊沉积物对17β-雌二醇（17β-estradiol,E2）的生物降解效能。结果表明：无论在好氧还是厌氧条件下,E2及其副产物雌激素酮（estrone,E1）的降解行为与沉积物沉积深度和环境温度有密切关系：底泥沉积深度愈深,E2降解速率愈低;在微生物活性温度范围内,环境温度愈高,E2降解速率愈高。好氧条件下,湖泊沉积物中E2降解反应的k值为0.002～0.120h^-1·g^-1·L;厌氧条件下,k值为0.002～0.057h^-1·g^-1·L。由于诱导驯化及有机物竞争关系减小等原因,向反应体系中再次添加E2后,其k值增大约34%。湖泊沉积物中硝化细菌的存在对E2降解具有促进作用。

英文摘要：

Batch experiments using sediment mud liquors spiked with 17β-estradiol（E2） were performed.The sediment mud liquors were prepared from the sliced surface（SL,0~2 cm）,middle（ML,14~16 cm） and bottom（BL,28~30 cm） layers of sediment cores collected in a lake,respectively.By measuring the concentration profiles of E2 and its biotransformation compound,estrone（E1）,the great dependency of E2＇s degradation behavior upon the vertical position of the sediment and temperature was clearly demonstrated under both aerobic and anaerobic conditions： the degradation rate decreased with the increase of sediment depth and increased with higher temperature.In addition,by assuming a first-order rate reaction,the disappearance rate constant（k） of E2 under the aerobic condition was estimated to in the range of 0.002~0.120 h^-1·g^-1L,while under the anaerobic condition in the range of 0.002~0.057 h^-1·g^-1L.Because of microorganism domestication and competition reduction of organic compounds,k was increased by about 34% after re-spiking E2.The addition of ammonia to the experiment under aerobic condition seemed to be responsible for promoting disappearance of E2 from solutions.