四环素对缺氧污泥的毒性及其去除效果分析
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摘要
从有机物降解及污泥产率2方面着手,考察了四环素(TC)对缺氧污泥的毒性作用,并研究了缺氧污泥对TC的去除效果。结果表明,TC对缺氧污泥的毒性随着TC初始含量的提高、接触时间的延长而增大。当TC的质量浓度由0提高到20 mg/L时,系统对有机物降解的抑制率由0提高到51.1%,污泥表观产率(m(COD)/m(MLSS))由0.46 g/g降为0;缺氧污泥主要通过快速吸附作用去除水中的TC,在TC的质量浓度分别为5、10、20 mg/L时,系统对水相中TC去除率分别为91.28%、90.09%、88.35%。随着TC含量的提高、反应周期的增加,缺氧污泥对TC的吸附平衡时间延长,吸附率降低。缺氧污泥对TC的吸附符合伪2级反应动力学模型(R2>0.999)。
Thetoxicity of tetracycline(TC) onthe removal of organic compounds and sludge yield in hypoxia sludge system was investigated,and the removal efficiency of TC by hypoxia sludge was studied.The results showed that TC had significant toxicity effects on the hypoxia sludge.With the increase of TC concentration and the contact time,the toxicity effects became apparent.When TC concentration increased from 0 to 20 mg/L,the inhibition rate of organic degradation increased from 0 to 51.1%,and the sludge yield decreased from 0.46 to 0 g/g.The removal of TC from the wastewater was achieved mainly via rapid adsorption on the hypoxia sludge,and the removal rates of TC were 91.28%,90.09% and 88.35%,respectively when their initial concentrations were 5,10 and 20 mg /L respectively.With the increase of TC concentration and the contact time,the equilibrium time was prolonged and adsorption rate reduced.The adsorption process followed pseudo second-order kinetic model(R2>0.999).
Thetoxicity of tetracycline(TC) onthe removal of organic compounds and sludge yield in hypoxia sludge system was investigated,and the removal efficiency of TC by hypoxia sludge was studied.The results showed that TC had significant toxicity effects on the hypoxia sludge.With the increase of TC concentration and the contact time,the toxicity effects became apparent.When TC concentration increased from 0 to 20 mg/L,the inhibition rate of organic degradation increased from 0 to 51.1%,and the sludge yield decreased from 0.46 to 0 g/g.The removal of TC from the wastewater was achieved mainly via rapid adsorption on the hypoxia sludge,and the removal rates of TC were 91.28%,90.09% and 88.35%,respectively when their initial concentrations were 5,10 and 20 mg /L respectively.With the increase of TC concentration and the contact time,the equilibrium time was prolonged and adsorption rate reduced.The adsorption process followed pseudo second-order kinetic model(R2>0.999).
引文
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[2]B Halling-S覬rensen,G Sengel覬v.Toxicity of tetracycline and tetracyclinedegradation products to environmentally relevant bacteria,includingselected tetracycline-resistant bacteria[J].Archives of EnvironmentalContamination and Toxicology,2002,42(3):263-271.
[3]陈建,王京平,王静.四环素在石墨上吸附行为研究[J].环境工程学报,2010,4(1):17-20.
[4]武庭瑄,周敏,郭宏栋.四环素在黄土中的吸附行为[J].环境科学学报,2008,28(11):2312-2314.
[5]武庭瑄,周敏,万建新.膨润土和高岭土对四环素吸附的影响[J].农业环境科学学报,2009,28(5):914-918.
[6]鲍艳宇,周启星,万莹.3种四环素类抗生素在褐土上的吸附和解吸[J].中国环境科学,2010,30(10):1383-1388.
[7]胡佶,王江涛.四环素在海洋沉积物上的吸附[J].高等学校化学学报,2010,31(2):320-324.
[8]刘江国,李杰霞,陈玉成.改性玉米秸秆对四环素废水的吸附研究[J].环保科技,2009,15(4):27-30.
[9]陈瑞萍,张丽,于洁.活性污泥对四环素的吸附性能研究[J].环境科学,2012,33(1):156-161.
[10]唐礼庆.四环素类制药废水污染物降解试验研究[M].南京:河海大学,2007.
[11]Prado N,Ochoa J,Amrane A.Biodegradation and biosorption oftetracycline and tylosin antibiotics in activated sludge system[J].Process Biochemistry,2009,44(11):1302-1306.
[12]任荣,王爱娟,李克勋.好氧污泥对季铵盐吸附性能的研究[J].水处理技术,2011,37(1):39-43.