Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Civil Engineering, Beijing University of Technology, Beijing 100124, China.
Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Civil Engineering, Beijing University of Technology, Beijing 100124, China.
Bioresour Technol. 2014 Mar;156:29-34. doi: 10.1016/j.biortech.2013.12.128. Epub 2014 Jan 8.
This study demonstrated the excellent di-(2-ethylhexyl) phthalate (DEHP) removal performance of a pre-denitrification biofilter system. Experimental results showed that DEHP removal efficiency remained stable while total nitrogen removal efficiency fluctuated with the nitrate recycle ratio changes when the hydraulic loading rate at 1.1m(3)/m(2)h. DEHP removal efficiency increased from 48% to 82% while the hydraulic loading rate increased from 1.1 to 2.2m(3)/m(2)h. DEHP concentration decreased gradually along the wastewater flow direction in the denitrification biofilter and a plug flow model with the reaction order of 5 and the rate constant of 0.54 was obtained. Both the denitrification biofilter and the nitrification biofilter showed similar DEHP removal performance. The overall DEHP removal efficiency of the system was 83.8%, in which biodegradation contributed 72.3%. Biodegradation plays a key role in DEHP removal in the pre-denitrification biofilter system.
本研究表明，预反硝化生物滤池系统具有优异的二（2-乙基己基）邻苯二甲酸酯（DEHP）去除性能。实验结果表明，在水力负荷为 1.1m³/m²h 时，当硝酸盐循环比变化时，总氮去除效率波动，而 DEHP 去除效率保持稳定。当水力负荷从 1.1m³/m²h 增加到 2.2m³/m²h 时，DEHP 去除效率从 48%增加到 82%。DEHP 浓度沿反硝化生物滤池的废水流动方向逐渐降低，并获得了反应级数为 5 和速率常数为 0.54 的活塞流模型。反硝化生物滤池和硝化生物滤池均表现出相似的 DEHP 去除性能。系统的整体 DEHP 去除效率为 83.8%，其中生物降解贡献了 72.3%。生物降解在预反硝化生物滤池系统中对 DEHP 的去除起着关键作用。
