Cho E S, Zhu J, Yang P Y
Graduate Program in Bioengineering, Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA.
J Environ Manage. 2007 Aug;84(3):257-65. doi: 10.1016/j.jenvman.2006.06.004. Epub 2006 Aug 7.
The PEMMC-Biobarrel (packed-bed of entrapped mixed microbial cells with Bio-barrel) process and MEMMC-Biobarrel (moving EMMC-Biobarrel) process were investigated for enhancing concurrent organic and nitrogen removal with applied intermittent aeration. For the PEMMC-Biobarrel process, the EMMC-Biobarrel carriers were employed at a packing ratio of 20%. In the MEMMC-Biobarrel process, the EMMC-Biobarrel carriers with a packing ratio of 10% were added along with the activated sludge (AS) in the bioreactor. Three different hydraulic retention times (HRTs) of 9, 6 and 4 h were applied. Aeration was provided intermittently at time schedules of 1 h air on/1 h air off, 1 h on/1.5 h off and 1 h on/2 h off. Nitrogen removal in the PEMMC-Biobarrel system was not improved by increasing the intermittent non-aeration time period. On the other hand, the MEMMC-Biobarrel process enhanced nitrogen removal with increasing non-aeration time even though the SCOD/N(TIN) ratio decreased from 6 to 4. Significant denitrification during the aeration cycle was observed in the MEMMC-Biobarrel process. The MEMMC-Biobarrel process demonstrated the most efficient organic and nitrogen removal at an HRT of 6 h with an intermittent aeration time schedule of 1 h on/2 h off. Nitrogen removal of 80% was achieved, which was about 15% higher compared to the AS system. TCOD and SCOD removal efficiencies were 80% and 75%, respectively.
研究了PEMMC-生物桶（固定化混合微生物细胞填充床与生物桶）工艺和MEMMC-生物桶（移动EMMC-生物桶）工艺，通过应用间歇曝气来提高有机物和氮的同步去除效果。对于PEMMC-生物桶工艺，EMMC-生物桶载体的填充率为20%。在MEMMC-生物桶工艺中，填充率为10%的EMMC-生物桶载体与活性污泥（AS）一起添加到生物反应器中。应用了9、6和4小时三种不同的水力停留时间（HRT）。曝气按照1小时曝气/1小时停气、1小时曝气/1.5小时停气和1小时曝气/2小时停气的时间安排间歇进行。在PEMMC-生物桶系统中，增加间歇非曝气时间段并不能提高氮的去除率。另一方面，尽管溶解性化学需氧量/总氮（TIN）比值从6降至4，但MEMMC-生物桶工艺随着非曝气时间的增加提高了氮的去除率。在MEMMC-生物桶工艺中观察到曝气周期内有显著的反硝化作用。MEMMC-生物桶工艺在HRT为6小时、间歇曝气时间安排为1小时曝气/2小时停气时，表现出最有效的有机物和氮去除效果。实现了80%的氮去除率，比活性污泥系统高出约15%。总化学需氧量（TCOD）和溶解性化学需氧量（SCOD）的去除效率分别为80%和75%。
