Triclosan (TCS); a widely used antimicrobial biocide, exists in several pharmaceutical and personal care products. Due to its wide usage, TCS is detected in wastewater at varying concentrations. Biological treatability of TCS and its effect on chemical oxygen demand (COD) removal efficiency were investigated running laboratory-scale pulse-fed sequencing batch reactors with acclimated and non-acclimated cultures. The culture was acclimatized to TCS by gradually increasing its concentration in the synthetic feed wastewater from 100 ng/L to 100 mg/L. There were no effects of TCS on COD removal efficiency up to the TCS concentration of 500 ng/L for both acclimatized and non-acclimatized cases. However, starting from a concentration of 1 mg/L, TCS affected the COD removal efficiency adversely. This effect was more pronounced with non-acclimatized culture. The decrease in the COD removal efficiency reached to 47% and 42% at the TCS concentration of 100 mg/L, under acclimation and non-acclimation conditions respectively. Adsorption of TCS into biomass was evidenced at higher TCS concentrations especially with non-acclimated cultures. 2,4-dichlorophenol and 2,4-dichloroanisole were identified as biodegradation by-products. The occurrence and distribution of these metabolites in the effluent and sludge matrices were found to be highly variable depending, especially, on the culture acclimation conditions.

三氯生（TCS）; 一种广泛使用的抗微生物杀菌剂，存在于几种药物和个人护理产品中。由于其用途广泛，因此可在浓度不同的废水中检测到TCS。在具有驯化和非驯化培养物的实验室规模脉冲进料测序间歇反应器中，研究了TCS的生物可处理性及其对化学需氧量（COD）去除效率的影响。通过逐渐将其在合成饲料废水中的浓度从100 ng / L增加到100 mg / L，使培养物适应TCS。在适应和未适应的情况下，TCS对500 ng / L的TCS浓度下的COD去除效率均无影响。但是，从1 mg / L的浓度开始，TCS会对COD去除效率产生不利影响。对于非适应性培养，这种效果更为明显。在驯化和非驯化条件下，当TCS浓度为100 mg / L时，COD去除效率的降低分别达到47％和42％。在较高的TCS浓度下，尤其是在非驯化培养物中，证明了TCS吸附到生物质中。2,4-二氯苯酚和2,4-二氯苯甲醚被鉴定为生物降解副产物。发现这些代谢物在废水和污泥基质中的发生和分布变化很大，尤其是取决于培养的驯化条件。在较高的TCS浓度下，尤其是在非驯化培养物中，证明了TCS吸附到生物质中。2,4-二氯苯酚和2,4-二氯苯甲醚被鉴定为生物降解副产物。发现这些代谢物在废水和污泥基质中的发生和分布变化很大，尤其是取决于培养的驯化条件。在较高的TCS浓度下，尤其是在非驯化培养物中，证明了TCS吸附到生物质中。2,4-二氯苯酚和2,4-二氯苯甲醚被鉴定为生物降解副产物。发现这些代谢物在废水和污泥基质中的发生和分布变化很大，尤其是取决于培养的驯化条件。