Optimized aeration strategies for nitrogen removal efficiency: application of end gas recirculation aeration in the fixed bed biofilm reactor

Environmental Science and Pollution Research International
Jia Heng ZhouJian Ming Yu

Abstract

Aeration strategy played an important role in reactor performance. In this study, when superficial upflow air velocity (SAV) decreased from 0.16 to 0.08 cm s-1, low dissolved oxygen concentration (DO) of 2.0 mg L-1 occurred in reactor. The required depth for anoxic microenvironment in biofilm decreased from 902.3 to 525.9 μm, which enhanced the growth of denitrifying bacteria and total nitrogen (TN) removal efficiency. However, decreasing aeration intensity resulted in insufficient hydraulic shear stress, which led to weak biofilm matrix structure. Mass biofilm detachment and reactor deterioration then occurred after 87 days of operation. An end gas recirculation aeration strategy was proposed to separately manipulate DO and aeration intensity. Low DO and high aeration intensity were simultaneously achieved, which enhanced the metabolism of denitrifying bacteria (such as Flavobacterium sp., Pseudorhodobacter sp., and Dok59 sp.) and EPS-producing bacteria (such as Zoogloea sp. and Rhodobacter sp.). Consequently, high TN removal performance (82.1 ± 2.7%) and stable biofilm structure were achieved.

References

Jun 27, 2003·Biotechnology and Bioengineering·Hisashi SatohSatoshi Okabe
Jul 8, 2005·Water Research·P JarvisS A Parsons
Jun 25, 2008·Biotechnology Advances·Sunil S AdavJoo-Hwa Tay
Nov 6, 2009·Applied Microbiology and Biotechnology·Sunil S AdavJuin-Yih Lai
Mar 2, 2010·Applied and Environmental Microbiology·L A BereschenkoM C M van Loosdrecht
Sep 16, 2010·Environmental Science & Technology·Li LiuDuu-Jong Lee
Oct 23, 2010·Journal of Hazardous Materials·Yousef RahimiBehzad Shahmoradi
Jul 11, 2012·Water Research·Thomas SeviourYuemei Lin
Jul 17, 2012·Water Research·Mari K H WinklerMark C M van Loosdrecht
Apr 16, 2013·Water Environment Research : a Research Publication of the Water Environment Federation·Chong TanJianzheng Li
Aug 21, 2013·Water Research·Samuel LochmatterChristof Holliger
Mar 25, 2014·Applied and Environmental Microbiology·Graciela Gonzalez-Gil, Christof Holliger
Apr 20, 2017·Environmental Science and Pollution Research International·Qiong GuoRen-Cun Jin
Sep 3, 2017·Bioresource Technology·Aline LebranchuEric Olmos

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