Oliveira G H D, Santos-Neto A J, Zaiat M
Laboratory of Biological Processes, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering, University of São Paulo (USP), 1100, João Dagnone Ave., Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil.
Institute of Chemistry of São Carlos, University of São Paulo (USP), 400, Trabalhador São-Carlense Ave., São Carlos, São Paulo, 13566-590, Brazil.
Bioprocess Biosyst Eng. 2016 Jan;39(1):115-24. doi: 10.1007/s00449-015-1495-3. Epub 2015 Nov 2.
This study investigated the removal of the veterinary antimicrobial sulfamethazine (SMZ) using anaerobic granular sludge in batch tests. Adsorption and biodegradation were the main mechanisms involved, with adsorption being properly described by a pseudo-second-order model and a linear adsorption isotherm. The adsorption rate constant ranged from 0.00051 to 0.00587 L µg(-1) h(-1), whereas the SMZ partition coefficient was determined to be 0.0717 L g TVS(-1). Biodegradation depended on the presence of readily available organic matter, indicating the occurrence of cometabolism. The addition of exogenous COD to a 144-h batch run at the concentration level of 100 µg L(-1) increased the efficiency of SMZ removal from 57 to 84%. A two-compartment model was developed and fitted to the experimental results, which established the aqueous phase as the main bioavailable compartment. The results suggested that SMZ conversion in anaerobic reactors benefits from high influent dilution and an exogenous supply of organic matter.
本研究在批次试验中使用厌氧颗粒污泥研究了兽用抗菌剂磺胺二甲嘧啶（SMZ）的去除情况。吸附和生物降解是主要的作用机制，吸附过程可用准二级模型和线性吸附等温线恰当描述。吸附速率常数范围为0.00051至0.00587 L μg⁻¹ h⁻¹，而SMZ分配系数测定为0.0717 L g TVS⁻¹。生物降解取决于易降解有机物的存在，表明存在共代谢现象。在144小时的批次运行中，以100 μg L⁻¹的浓度水平添加外源化学需氧量（COD），使SMZ的去除效率从57%提高到84%。开发了一个两室模型并将其拟合到实验结果中，该模型确定水相是主要的生物可利用室。结果表明，厌氧反应器中SMZ的转化受益于高进水稀释度和外源有机物供应。
