抗菌剂三氯生在化粪池中的留存情况。

Retainment of the antimicrobial agent triclosan in a septic tank.

作者信息

Kirjanova Ala, Rimeika Mindaugas, Vollertsen Jes, Nielsen Asbjørn Haaning

机构信息

Department of Water Management, Faculty of Environmental Engineering, Vilnius Gediminas Technical University, Sauletekio 11, LT-10223 Vilnius, Lithuania E-mail:

Department of Civil Engineering, Faculty of Engineering and Science, Aalborg University, Sohngaardsholmsvej 57, 9000 Aalborg, Denmark.

出版信息

Water Sci Technol. 2014;70(4):586-92. doi: 10.2166/wst.2014.271.

DOI:10.2166/wst.2014.271

PMID:25116485

Abstract

Laboratory experiments were conducted to investigate the fate of the antimicrobial agent triclosan (TCS) in a conventional septic tank. The main mechanism of TCS removal from wastewater was identified to be rapid TCS sorption to suspended particles followed by settling of these particles to the bottom of the septic tank. Sorption to particles was completed within minutes while the settling took several days. Therefore, in a septic tank the removal of TCS from wastewater is mainly determined by the removal of suspended particles by sedimentation. Over 5 days of hydraulic residence time the initial dissolved TCS concentration of 100 μg L(-1) was reduced by 87 ± 8%. During the first 24 hours, 66-86% of all removed TCS was retained, whereas during the remainder of the experiment a slight but steady decrease in TCS concentration was observed. This was most likely caused by TCS diffusion and its subsequent sorption onto the septic sludge.

摘要

进行了实验室实验，以研究抗菌剂三氯生（TCS）在传统化粪池中的归宿。确定从废水中去除TCS的主要机制是TCS迅速吸附到悬浮颗粒上，随后这些颗粒沉降到化粪池底部。几分钟内即可完成对颗粒的吸附，而沉降则需要几天时间。因此，在化粪池中，从废水中去除TCS主要取决于通过沉淀去除悬浮颗粒。在5天的水力停留时间内，初始溶解的TCS浓度为100μg L(-1)，降低了87±8%。在最初的24小时内，所有去除的TCS中有66-86%被保留，而在实验的其余时间里，观察到TCS浓度略有但稳定的下降。这很可能是由于TCS扩散及其随后吸附到化粪池污泥上所致。