Singh Nitin Kumar, Bhatia Akansha, Kazmi Absar Ahmad
a Department of Civil Engineering , Indian Institute of Technology , Roorkee , India.
Environ Technol. 2017 Nov;38(22):2866-2876. doi: 10.1080/09593330.2017.1281349. Epub 2017 Jan 31.
This study investigated the effect of various intermittent aeration (IA) cycles on organics and nutrient removal, and microbial communities in an integrated fixed-film activated sludge (IFAS) reactor treating municipal waste water. Average effluent biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids, total nitrogen (TN) and total phosphorus (TP) values were noted as 20, 50, 30, 12 and 1.5 mgL, respectively, in continuous aeration mode. A total of four operational conditions (run 1, continuous aeration; run 2, 150/30 min aeration on/off time; run 3, 120/60 min aeration on/off time and run 4, 90/60 min aeration on/off time) were investigated in IFAS reactor assessment. Among the all examined IA cycles, IA phase 2 gave the maximum COD and BOD removals with values recorded as 97% and 93.8%, respectively. With respect to nutrient removal (TN and TP), IA phase 1 was found to be optimum. Pathogen removal efficiency of present system was recorded as 90-95% during the three phases. With regard to settling characteristics, pilot showed poor settling during IA schedules, which was also evidenced by high sludge volume index values. Overall, IA could be used as a feasible way to improve the overall performance of IFAS system.
本研究调查了在处理城市废水的一体化固定膜活性污泥（IFAS）反应器中，各种间歇曝气（IA）周期对有机物和营养物去除以及微生物群落的影响。在连续曝气模式下，平均出水生物需氧量（BOD）、化学需氧量（COD）、总悬浮固体、总氮（TN）和总磷（TP）值分别记录为20、50、30、12和1.5mg/L。在IFAS反应器评估中，总共研究了四种运行条件（运行1，连续曝气；运行2，曝气/关闭时间为150/30分钟；运行3，曝气/关闭时间为120/60分钟；运行4，曝气/关闭时间为90/60分钟）。在所有检查的IA周期中，IA阶段2的COD和BOD去除率最高，分别记录为97%和93.8%。关于营养物去除（TN和TP），发现IA阶段1是最佳的。在三个阶段中，本系统的病原体去除效率记录为90-95%。关于沉降特性，中试在IA计划期间沉降较差，高污泥体积指数值也证明了这一点。总体而言，IA可作为提高IFAS系统整体性能的可行方法。
