期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 191, 期 1-3, 页码 103-109出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.04.048
关键词
Tetracycline; Nitrifying granular sludge; Sorption; Biodegradation; Toxicity
资金
- Program for New Century Excellent Talents in University [NCET-10-0528]
- National Natural Science Foundation of China [50978157, 21007033]
- Excellent Young Scientist Foundation of Shandong Province [BS2010HZ009]
- Independent Innovation Foundation of Shandong University [2009TS022, 2009GN048]
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 150 mg/L. With the ATU addition, TC degradation was weakened remarkably, indicating a synergistic effect of multiple microbes. Results of the short-term exposure (12 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 (K-s) increasing from 297.7 to 347.2 mg/L. (C) 2011 Elsevier B.V. All rights reserved.
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