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金霉素在活性污泥上的吸附行为

ISSN号：1673-9108
期刊名称：《环境工程学报》
时间：0
分类：X703[环境科学与工程—环境工程]
作者机构：[1]山东农业大学环境工程系,山东省高校农业环境重点实验室,泰安271018, [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085
相关基金：国家自然科学基金面上项目（50878206,50921064）

关键词：金霉素, 活性污泥, 吸附, 吸附模型, PH, chlortetracycline, activated sludge, adsorption, adsorption model, pH

中文摘要：

通过批次实验考察了活性污泥对金霉素（chlortetracycline，CTC）的吸附特性，研究了包括吸附平衡时间、污泥浓度（MLSS）、温度以及pH值对吸附的影响。结果表明，CTC在活性污泥上的吸附是一个快速的过程，5min可达到平衡吸附量的90％以上，6h达到吸附平衡；CTC的总去除率随着MLSS浓度的增加而增大，而污泥单位吸附量却随之减少，当CTC初始浓度为500μg／L，MLSS浓度从1000mg／L增至8000mg／L时，吸附平衡时CTC的总去除率从30．97％上升至60．42％，而污泥单位吸附量则从151326．70μg／kg下降至37530．98μg／kg；在10、20、30℃条件下，吸附较好地符合Freun—dlich等温吸附模型和线性分配吸附模型，Kd值依次为190．93、162．32和121．08L／kg；热力学数据表明，CTC在污泥上的吸附为放热过程，低温有利于吸附的进行；当pH值介于3～11之间时，CTC在污泥上的吸附量随着pH值的增加而减少。

英文摘要：

Batch experiments were conducted to investigate the adsorption characteristics of chlortetracycline （CTC） antibiotic on activated sludge. The effects of adsorption time, MLSS concentration,temperature and pH on adsorption were investigated. The results showed that the adsorption of CTC on activated sludge was a rapid process. The adsorbance reached more than 90% of the equilibrium adsorption capacity in five minutes,and the equilibrium was reached in 6 hours. The total removal rate of CTC increased with the rise of MLSS concentra- tion while the unit adsorption amounts decreased. When the initial concentration of CTC was 500 μg/L and the MLSS concentration increased from 1 000 mg/L to 8 000 mg/L,the total removal rate increased from 30.97% to 60.42% at equilibrium,while the unit adsorption amount decreased from 151 326.70 μg/kg to 37 530.98 μg/ kg. The results fitted well with the Freundlich model and linear adsorption isotherms at the temperatures of 10, 20,30℃. The Kd were 190.93,162.32 and 121.08 L/kg, respectively. According to the thermodynamic data, the adsorption of CTC on activated sludge was an exothermic process and the adsorption coefficient decreased with the increase of temperature. When the pH was between 3 to 11, the adsorbance decreased with the increase of pH.