Abstract
A microbial process for the degradation of sulfamethazine (SMN) was studied. The activated sludge of a municipal sewage treatment plant was used to degrade SMN under controlled conditions. Results show that the aerobic condition was favored for the removal of SMN and the removal process was characterized by rapid adsorption on activated sludge and subsequent slow biodegradation. Nearly complete removal of SMN (500 mu g/L) was achieved after 120 h, which was principally attributed to biodegradation. SMN was removed at a faster pace at a higher mixed liquor suspended solids (MLSS) concentration and temperature, while the influence of the soluble chemical oxygen demand (COD) concentration was comparatively insignificant. The specific pseudo-first-order rate constant per unit MLSS decreased with an increase in MLSS concentration. The temperature coefficients (theta) were similar (1.042 and 1.027) over the ranges of 10-20 degrees C and 20-30 degrees C, respectively. (C) 2014 American Society of Civil Engineers.
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