Fate of sulfonamide antibiotics in contact with activated sludge - Sorption and biodegradation

WATER RESEARCH

卷:46

Article

Yang, Sheng-Fu¹  Lin, Cheng-Fang¹  Wu, Chien-Ju¹  Ng, Kok-Kwang¹  Lin, Angela Yu-Chen¹  Hong, Pui-Kwan Andy² 

[1] Natl Taiwan Univ, Grad Inst Environm Engn, Taipei 10617, Taiwan

[2] Univ Utah, Dept Civil & Environm Engn, Salt Lake City, UT 84112 USA

关键词: Sorption;    Biodegradation;    Sulfonamide antibiotics;    Activated sludge;   

DOI  :  10.1016/j.watres.2011.12.035

来源: Elsevier

【 摘 要 】

The sorption and biodegradation of three sulfonamide antibiotics, namely sulfamethoxazole (SMX), sulfadimethoxine (SDM), and sulfamonomethoxine (SMM), in an activated sludge system were investigated. Experiments were carried out by contacting 100 mu g/L of each sulfonamide compound individually with 2.56 g/L of MLSS at 25 +/- 0.5 degrees C, pH 7.0, and dissolved oxygen of 3.0 +/- 0.1 mg/L in a batch reactor over different periods of 2 d and 14 d. All sulfonamides were removed completely over 11-13 d. Sorptive equilibrium was established well within the first few hours, followed by a lag period of 1-3 days before biodegradation was to deplete the antibiotic compounds linearly in the ensuing 10 days. Apparent zeroth-order rate constants were obtained by regression analysis of measured aqueous concentration vs. time profiles to a kinetic model accounting for sorption and biodegradation; they were 8.1, 7.9, and 7.7 mu g/L/d for SDM, SMX, and SMM, respectively, at activated sludge concentration of 2.56 g/L. The measured kinetics implied that with typical hydraulic retention time (e.g. 6 h) provided by WWTP the removal of sulfonamide compounds from the wastewater during the activated sludge process would approximate 2 mu g/L. (C) 2011 Elsevier Ltd. All rights reserved.

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