Sharvelle Sybil E, Garland Jay, Banks M K
School of Civil Engineering, Purdue University, West Lafayette, IN, USA.
Biodegradation. 2008 Apr;19(2):215-21. doi: 10.1007/s10532-007-9128-4. Epub 2007 May 30.
Polyalcohol ethoxylate (PAE), an anionic surfactant, is the primary component in most laundry and dish wash detergents and is therefore highly loaded in domestic wastewater. Its biodegradation results in the formation of several metabolites and the fate of these metabolites through wastewater treatment plants, graywater recycling processes, and in the environment must be clearly understood. Biodegradation pathways for PAE were investigated in this project with a municipal wastewater microbial consortium. A microtiter-based oxygen sensor system was utilized to determine the preferential use of potential biodegradation products. Results show that while polyethylene glycols (PEGs) were readily degraded by PAE acclimated microorganisms, most of the carboxylic acids tested were not degraded. Biodegradation of PEGs suggests that hydrophobe-hydrophile scission was the dominant pathway for PAE biodegradation in this wastewater community. Ethylene glycol (EG) and diethylene glycol (DEG) were not utilized by microbial populations capable of degrading higher molecular weight EGs. It is possible that EG and DEG may accumulate. The microtiter-based oxygen sensor system was successfully utilized to elucidate information on PAE biodegradation pathways and could be applied to study biodegradation pathways for other important contaminants.
聚醇乙氧基化物（PAE）是一种阴离子表面活性剂，是大多数洗衣和洗碗洗涤剂中的主要成分，因此在生活污水中含量很高。其生物降解会产生几种代谢产物，必须清楚了解这些代谢产物在污水处理厂、中水回用过程以及环境中的归宿。本项目利用城市污水微生物群落研究了PAE的生物降解途径。基于微量滴定板的氧传感器系统用于确定潜在生物降解产物的优先利用情况。结果表明，虽然聚乙二醇（PEGs）很容易被适应PAE的微生物降解，但所测试的大多数羧酸并未降解。PEGs的生物降解表明，疏水-亲水断裂是该污水群落中PAE生物降解的主要途径。能够降解高分子量乙二醇的微生物群体不利用乙二醇（EG）和二甘醇（DEG）。EG和DEG有可能会积累。基于微量滴定板的氧传感器系统成功用于阐明PAE生物降解途径的信息，可应用于研究其他重要污染物的生物降解途径。
