对磺胺嘧啶厌氧生物降解机理的研究

Study on anaerobic biodegradation mechanism of sulfadiazine

以磺胺嘧啶为目标污染物,考察厌氧生物对磺胺嘧啶的降解性能。结果表明,在25℃、pH为6.0、外加100 mg/L碳酸氢钠的条件下,微生物对20 mg/L磺胺嘧啶的降解率为99.7%,磺胺嘧啶的降解过程符合零级反应动力学特征。降解途径分析显示,厌氧生物通过3条平行途径降解磺胺嘧啶,将磺胺嘧啶逐渐转化为低毒和无毒的化合物,其中2-氨基-4-羟基嘧啶是主要降解产物。

Choosing sulfadiazine as the target pollutant,the degradati on performance of sulfadiazine by anaerobic organisms was investigated.The results showed that the degradation rate of sulfadiazine at 20 mg/L by microorganisms was 99.7%under the conditions of 25℃,pH=6.0,and 100 mg/L sodium bicarbonate.The degradation process of sulfadiazine met zero-order reaction kinetics.Analysis of degradation pathways showed that anaerobic organisms degrade sulfadiazine through three parallel pathways,the sulfadiazine was gradually transformed into low-toxic and nontoxic compounds,of which 2-amino-4-hydroxypyrimidine was main degradation product.