活性污泥对雌激素的吸附和好氧生物降解  

Adsorption and biodegradation of typical estrogens in activated sludge under aerobic conditions

作　　者：王凌云[1] 张锡辉[1] 陶益[1] 胡江泳[2] 

机构地区：[1]清华大学深圳研究生院环境工程与管理研究中心,广东深圳518055 [2]新加坡国立大学土木与环境工程系,新加坡119260

出　　处：《哈尔滨工业大学学报》2013年第8期117-121,共5页Journal of Harbin Institute of Technology

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07423-001);水利部公益性行业专项(201201033)

摘　　要：为研究活性污泥工艺对类固醇类雌激素去除的规律,从深港两地的污水处理厂采集4种不同性质的污泥,比较其对5种环境雌激素酮(E1)、雌二醇(E2)、雌三醇(E3)、17α-雌二醇(17α-E2)和雌炔醇(EE2)的吸附和生物降解.采用液液萃取-GC-MS方法对体系中残留雌激素的质量浓度进行分析.结果表明:4种污泥对雌激素的吸附在30 min～1 h达到吸附平衡,吸附量在各污泥之间差异无统计学意义,5种雌激素的平均吸附量分别约为1.6、1.7、0.9、2.6和2.5μg.mg-1,平均降解速率分别为326、252、440、275和13μg.L-1.d-1;综合吸附和降解,5种雌激素在污泥中的半衰期平均约为14.9、0.9、4.3、4.7 h和18.9 d.E3的吸附量低于其他雌激素,可能与其极性基团有关;EE2的转化速率显著低于天然雌激素;硝化污泥对EE2的转化速度显著高于其他污泥,硝化菌群可能起到重要作用.The adsorption and biodegradability of thefive estrogens,including estrone（E1）,17β-estradiol（E2）,estriol（E3）,17α-estradiol and 17α-ethynylestradiol（EE2）,by four kinds of activated sludge collected from sewage treatment plants in Hong Kong and Shenzhen are characterized.A pretreatment method of Liquid-liquid-extraction and the GC-MS measurement were applied for determining concentrations of residual estrogens.Adsorption equilibrium could be achieved in around 30 min-1 h and the residual estrogen in adsorption control sets kept relatively stable with no significant difference among different sludges.The average adsorption amount of EE2 and 17α-E2 were estimated at 2.6 and 2.5 μg per mg MLVSS,while E1,E2 and E3 had average adsorption amounts of 1.6,1.7 and 0.9 μg·mg^-1.The average biodegradation rate of E1,E2,E3,17α-E2 and EE2 was 326,252,440,275 and 13 μg·L^-1·d^-1,respectively under aerobic conditions.The half lives of E1,E2,E3,17α-E2 and EE2 by the four sludges were estimated at 14.9 h,0.9 h,4.3 h,4.7 h and 18.9 d in average.The adsorption amount of E3 was lower than other estrogens,which might be due to its polar structure.EE2 was the hardest to digest.The sludge AS2,nitrifying activated sludge（NAS）,was more effective in transforming EE2 than that of other three sludges,which might be closely related to the nitrifiers in NAS.

关 键 词：雌激素 活性污泥 吸附 生物降解 硝化污泥 雌炔醇 

分 类 号：X131.2[环境科学与工程—环境科学]