Marttinen Sanna K, Kettunen Riitta H, Sormunen Kai M, Rintala Jukka A
Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FIN-40014, Finland.
Water Res. 2003 Mar;37(6):1385-93. doi: 10.1016/S0043-1354(02)00486-4.
Bis(2-ethylhexyl) phthalate (DEHP) concentrations were measured at different stages in a full-scale sewage treatment plant (STP) and mass balances were calculated. The DEHP load to treatment process coming from the sewer system and the internal load comprising returned supernatants and filtrate from sludge treatment and excess secondary sludge were at the same level. The DEHP removal efficiency from the water phase at the STP was on average 94% of sewage DEHP, the main removal process being sorption to primary and secondary sludges. On average 29% of DEHP was calculated to be removed in the biological nitrifying-denitrifying activated sludge process, which was much less than expected from laboratory biodegradation studies described in literature. Monoethylhexyl phthalate, the primary biotransformation product of DEHP, was not detected at any treatment stage. Approximately 32% of DEHP in sewage was removed during anaerobic digestion of the sludge, while 32% remained in the digested and dewatered sludge.
在一座全尺寸污水处理厂（STP）的不同阶段测量了邻苯二甲酸二（2-乙基己基）酯（DEHP）的浓度，并计算了质量平衡。来自下水道系统进入处理工艺的DEHP负荷与包括污泥处理返回的上清液、滤液以及剩余二次污泥在内的内部负荷处于同一水平。污水处理厂水相中DEHP的去除效率平均为污水中DEHP的94%，主要去除过程是吸附到初沉污泥和二沉污泥上。经计算，在生物硝化反硝化活性污泥工艺中，平均29%的DEHP被去除，这远低于文献中描述的实验室生物降解研究的预期值。在任何处理阶段均未检测到DEHP的主要生物转化产物邻苯二甲酸单乙基己酯。在污泥厌氧消化过程中，污水中约32%的DEHP被去除，而32%保留在消化和脱水后的污泥中。
