Choi Changkyoo, Lee Jaekeun, Lee Kwangho, Kim Moonil
Department of Civil Engineering, Hanyang University, Ansan, Gyeonggi 425-791, Republic of Korea.
Bioresour Technol. 2008 Sep;99(13):5397-401. doi: 10.1016/j.biortech.2007.11.016. Epub 2008 Jan 4.
An intermittently aerated membrane bioreactor (IAMBR) system has been developed to improve the efficiency of nutrient removal, and for the stable treatment of organic matter which is contained as suspended solid (SS) in the influent. The important operating factors of an intermittently aerated bioreactor (IABR) are sludge retention times (SRTs) and carbon/nitrogen (C/N) ratios. Because research on IAMBR is young, this paper explores the effect of SRTs and C/N ratios on these systems. For SRTs of 20, 25, 30, and 40 days, there was little difference in the removal of COD, T-N, and T-P. In comparing C/N ratios of 4.5, 7, and 10, the COD concentration in permeate with a C/N ratio of 10 was most stable, although the concentration of organic matter in the influent was high. The removal efficiencies of T-N and T-P in permeate with a C/N ratio of 10 were the highest at 92.9% and 88.9%, respectively. This implies that a C/N ratio above 10 should be maintained for a nutrient removal efficiency of approximately 90%.
一种间歇曝气膜生物反应器（IAMBR）系统已被开发出来，以提高养分去除效率，并稳定处理进水以悬浮固体（SS）形式存在的有机物。间歇曝气生物反应器（IABR）的重要运行因素是污泥停留时间（SRT）和碳氮比（C/N）。由于对IAMBR的研究尚处于初期阶段，本文探讨了SRT和C/N比在这些系统中的影响。对于20、25、30和40天的SRT，化学需氧量（COD）、总氮（T-N）和总磷（T-P）的去除率差异不大。在比较4.5、7和10的C/N比时，尽管进水有机物浓度较高，但C/N比为10时渗透液中的COD浓度最稳定。C/N比为10时渗透液中T-N和T-P的去除率最高，分别为92.9%和88.9%。这意味着为了达到约90%的养分去除效率，应保持C/N比高于10。
