title: Sorption and biodegradation of tetracycline by nitrifying granules and the toxicity of tetracycline on granules.
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 NH(4)(+)-N concentrations, with except of the NH(4)(+)-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 (12h) effects showed that the respirometric activities of the microbes decreased greatly. The addition of TC also decreased the rate of NH(4)(+)-N utilization considerably, with the half saturation constant (K(s)) increasing from 297.7 to 347.2 mg/L.
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, China.
authors.forename: Yi-Jing
authors.initials: YJ
authors.lastname: Shi
authors.forename: Xin-Hua
authors.initials: XH
authors.lastname: Wang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Qi
authors.forename: Mu-He
authors.initials: MH
authors.lastname: Diao
authors.forename: Ming-Ming
authors.initials: MM
authors.lastname: Gao
authors.forename: Su-Fang
authors.initials: SF
authors.lastname: Xing
authors.forename: Shu-Guang
authors.initials: SG
authors.lastname: Wang
authors.forename: Xing-Chen
authors.initials: XC
authors.lastname: Zhao
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D058465:Nitrification; D013696:Temperature; D013752:Tetracycline / Q000378:metabolism* / Q000633:toxicity
chemical_list: D013752:Tetracycline