Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
578786 | Journal of Hazardous Materials | 2011 | 7 Pages |
Abstract
This paper examines the simultaneous sorption and biodegradation performance of tetracycline (TC) by the nitrifying granular sludge as well as the short-term exposure toxicity of TC. The removal of TC was characterized by a quick sorption and a slow process of biodegradation. The adsorption process fits pseudo-second-order kinetic model, with a complex mechanism of surface adsorption and intra-particle diffusion. Both temperature and mixed liquor suspended solid (MLSS) influenced TC sorption to the granules. TC biodegradation was enhanced with the increase of COD and NH4+-N concentrations, with except of the NH4+-N concentrations higher than 150Â mg/L. With the ATU addition, TC degradation was weakened remarkably, indicating a synergistic effect of multiple microbes. Results of the short-term exposure (12Â h) effects showed that the respirometric activities of the microbes decreased greatly. The addition of TC also decreased the rate of NH4+-N utilization considerably, with the half saturation constant (Ks) increasing from 297.7 to 347.2Â mg/L.
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Authors
Yi-Jing Shi, Xin-Hua Wang, Zhen Qi, Mu-He Diao, Ming-Ming Gao, Su-Fang Xing, Shu-Guang Wang, Xing-Chen Zhao,