阿莫西林吸附行为评价(在不同pH条件下)_精品.pdf

Water Air Soil Pollut (2011) 219:191–201 DOI 10.1007/s11270-010-0697-1 Evaluation of the Fate of Ciprofloxacin and Amoxicillin in Domestic Wastewater Leonard J. M. Githinji Michael K. Musey Ramble O. Ankumah Received: 15 April 2010 /Accepted: 10 November 2010 /Published online: 26 November 2010 # Springer Science+Business Media B.V. 2010 Abstract The main objective of this study was to 0.1582 to 0.3858 Lg− 1 with the highest Kd at pH=3.5. evaluate the contribution of sorption to the removal of There was a significant difference (p 0.05) in Kd two commonly used antibiotics (amoxicillin and values between various pH levels for both antibiotics ciprofloxacin) from wastewater. These antibiotics are except between the pH of 5.5 and 6.6. Both antibiotics excreted in large quantities with more than 75% of were not degraded within 48 h by Rhodococcus sp. them being unmetabolized and are therefore likely to B30 strain. These results indicate that degradation may end up in domestic wastewater in significant quanti- not be the major process of removal of compounds ties. The specific objectives were to determine the from wastewater treatment plants and hence the sorption behavior in synthetic wastewater (SWW), the importance of sorption as an intervention technique. effect of pH and contribution of microbial surfaces, to the sorption of these antibiotics. The SWW, adjusted Keywords Amoxicillin . Antibiotics . Ciprofloxacin . to various pH levels, was used and sorption kinetics Distribution coefficient . Pharmaceuticals . − 1 conducted at 100 and 250 μg L concentrations. Rhodococcus B30 strain . Sorption . Synthetic Adsorption isotherms were