Adsorption behavior of sulfamethazine in an activated sludge process treating swine wastewater

作     者：Weiwei Ben Zhimin Qiang Xiaowei Yin Jiuhui Qu Xun Pan 

作者机构：Key Laboratory of Aquatic Science and TechnologyResearch Center for Eco-Environmental SciencesChinese Academy of Sciences Foreign Economic Cooperation OfficeMinistry of Environmental Protection 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2014年第26卷第8期

页      面：1623-1629页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 09[农学] 0903[农学-农业资源与环境] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos.21107127 and 51221892) the Ministry of Housing and Urban–rural Development of China (No.2012ZX07313-001-07) the State Key Laboratory of Environmental Aquatic Chemistry (No.10Y06ESPCR) 

主　　题：Sulfonamide antibiotics Activated sludge Adsorption Swine wastewater treatment 

摘      要：Swine wastewater is an important pollution source of antibiotics entering the aquatic environment. In this work,the adsorption behavior of sulfamethazine（SMN）,a commonlyused sulfonamide antibiotic,on activated sludge from a sequencing batch reactor treating swine wastewater was investigated. The results show that the adsorption of SMN on activated sludge was an initially rapid process and reached equilibrium after 6 hr. The removal efficiency of SMN from the water phase increased with an increasing concentration of mixed liquor suspended solids,while the adsorbed concentration of SMN decreased. Solution pH influenced both the speciation of SMN and the surface properties of activated sludge,thus significantly impacting the adsorption process. A linear partition model could give a good fit for the equilibrium concentrations of SMN at the test temperatures（i.e.,10,20 and 30°C）. The partition coefficient（Kd） was determined to be 100.5 L/kg at 20°C,indicating a quite high adsorption capacity for SMN. Thermodynamic analysis revealed that SMN adsorption on activated sludge was an exothermic process. This study could help to clarify the fate and behavior of sulfonamide antibiotics in the activated sludge process and assess consequent environmental risks arising from sludge disposal as well.