基于响应曲面法的改性污泥活性炭处理四环素废水的参数优化  

Removal of Tetracycline from Waste Water by the Prepared Modified Sludge Activated Carbon: Optimization of Parameters Using Response Surface Methodology

作　　者：孙东晓 周强 

机构地区：[1]中铁上海工程局集团市政环保工程有限公司,上海 [2]安徽工业大学建筑工程学院,安徽 马鞍山

出　　处：《水污染及处理》2021年第2期80-92,共13页Water Pollution and Treatment

摘　　要：以酒精厂废弃物木薯酒精污泥为原材料,用碳酸氢钠做活化剂,采用一步化学活化热解法制备污泥活性炭,并将其用于处理四环素废水。在单因素实验的基础上,以活性炭投加量、四环素浓度、pH和吸附时间为实验因素,四环素的去除率为评价指标,采用Box-Behnken实验设计,建立了二次多项式回归模型方程,并优化得到了活性炭去除四环素的最佳工艺参数。结果表明:所制备活性炭表面含有丰富的孔隙结构,SBET达到了375.75 m2∙g−1,孔体积为0.29 cm3∙g−1,孔径为3.05 nm左右;建立的二次多项式回归模型方程具有较高的可靠性,可以预测活性炭对四环素的去除。pH和活性炭投加量之间的相互作用对四环素去除有较大影响。活性炭去除四环素的最佳工艺参数为:pH = 3.26、四环素浓度53.27 mg∙L−1、活性炭投加量1.39 g∙L−1、吸附时间4.05 h,在此条件下四环素的去除率为97.87%。因此,木薯污泥基活性炭可有效去除水中四环素,是一种具有良好应用潜能的吸附材料。Based on the sludge from water treatment plant which treated the wastewater generated during the process of producing alcohol with cassava activated carbon was prepared by chemical activation pyrolysis with sodium bicarbonate as activator and was used to treat tetracycline wastewater. Some factors such as activated carbon dosage, tetracycline concentration, the pH dosage of activated car-bon, tetracycline concentration, pH and adsorption time were presented to design the tests of re-sponse surface methodology. The quadratic polynomial regression model equation was established and the optimal technological parameters for the removal of tetracycline by activated carbon were obtained. The results show that the surface of activated carbon is rich in pore structure with the specific surface of 375.75 m2∙g−1, the pore volume of 0.10 cm3∙g−1, the pore volume of 0.29 cm3∙g−1, and the pore diameter of 3.05 nm. The established model equation can be applied to predict the removal of tetracycline by activated carbon with a good reliability. The interaction between pH and activated carbon has great influence on the tetracycline removal. The optimal parameters for the removal of tetracycline by activated carbon are as follows: pH = 3.26, concentration of tetracycline 53.27 mg∙L−1, dosage of activated carbon 1.39 g∙L−1, and adsorption time 4.05 h. The removal effi-ciency of tetracycline is 97.87% in such conditions. Therefore, the prepared cassava sludge-based activated carbon is a potential absorbent for the removal of tetracycline from aqueous solution.

关 键 词：污泥 污泥活性炭 响应曲面法 四环素 吸附 

分 类 号：X70[环境科学与工程—环境工程]