School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
Bioresour Technol. 2018 May;255:266-272. doi: 10.1016/j.biortech.2018.01.100. Epub 2018 Jan 31.
Degradation and solid-liquid distribution of antibiotics in three sludge pretreatments (ultrasonic, alkaline and thermal hydrolysis pretreatment) and subsequent anaerobic digestion processes were investigated. The contamination of fluoroquinolones (FQs) was most serious in the raw sludge, while sulfonamides (SAs) were negligible. Obvious solubilization of antibiotics was observed after sludge pretreatments. The intracellular antibiotics were released after thermal hydrolysis pretreatment, meanwhile tetracyclines (TCs) were thermally decomposed. Compared to TCs and macrolides (MLs), FQs were hardly degraded in anaerobic digestion with removal efficiencies lower than 42.02%, and the residual FQs were mostly adsorbed on the digested sludge. The limiting step for FQs reduction was the biodegradation, rather than desorption of adsorbed antibiotics. Addition of pretreatments had no obvious effect on the degradation and distribution of antibiotics in the anaerobic digested sludge, except that the thermal hydrolysis enhanced the migration of antibiotics to the liquid phase.
研究了三种污泥预处理（超声、堿性和热水解预处理）和随后的厌氧消化过程中抗生素的降解和固-液相分布。在原污泥中，氟喹诺酮类（FQs）的污染最为严重，而磺胺类（SAs）则可以忽略不计。污泥预处理后，抗生素明显溶解。热水解预处理后，细胞内抗生素被释放出来，同时四环素（TCs）也被热分解。与 TCs 和大环内酯类（MLs）相比，FQs 在厌氧消化中几乎没有降解，去除效率低于 42.02%，并且残留的 FQs 主要被吸附在消化污泥上。FQs 减少的限制步骤是生物降解，而不是吸附抗生素的解吸。除了热水解增强了抗生素向液相的迁移外，预处理的添加对厌氧消化污泥中抗生素的降解和分布没有明显影响。
