Hasar Halil, Xia Siqing, Ahn Chang Hoon, Rittmann Bruce E
Center for Environmental Biotechnology, Biodesign Institute, Arizona State University, P.O. Box 875701, Tempe, AZ 85287-5701, USA.
Water Res. 2008 Sep;42(15):4109-16. doi: 10.1016/j.watres.2008.07.007. Epub 2008 Jul 17.
The hydrogen-based membrane biofilm reactor (MBfR) has been well studied and applied for denitrification of nitrate-containing water and wastewater. Adding an oxygen-based MBfR allows total-nitrogen removal when the input nitrogen is ammonium. However, most wastewaters also contain a significant concentration or organic material, measured as chemical oxygen demand (COD). This study describes experiments to investigate the removal of organic and nitrogenous compounds in the combined Aerobic/Anoxic MBfR, in which an Aerobic MBfR (Aer MBfR) precedes an Anoxic MBfR (An MBfR). The experiments demonstrate that the Aer/An MBfR combination accomplished COD oxidation and nitrogen removal for a total oxygen demand flux (i.e., from COD and NH(4) oxidations) in the range of 1.2-7.2 g O(2)/m(2)-d for 4.5 psi (0.3 atm) oxygen pressure to the Aer MBfR, but was overloaded and did not accomplish nitrification for the total oxygen demand load higher than 14 g O(2)/m(2)-d. Total-nitrogen removal was controlled by nitrification in the Aer MBfR, because the An MBfR denitrified all NO(3)(-) provided to it by the Aer MBfR. The overload of total oxygen demand did not affect COD oxidation in the Aer MBfR, but caused a small increase of COD in the An MBfR due to net release of soluble microbial products (SMP).
基于氢气的膜生物膜反应器（MBfR）已得到充分研究，并应用于含硝酸盐的水和废水的反硝化处理。当加入基于氧气的MBfR时，若输入氮为铵态氮，则可实现总氮去除。然而，大多数废水还含有相当浓度的有机物，以化学需氧量（COD）衡量。本研究描述了相关实验，以探究在好氧/缺氧联合MBfR中有机和含氮化合物的去除情况，其中好氧MBfR（Aer MBfR）位于缺氧MBfR（An MBfR）之前。实验表明，对于向Aer MBfR施加4.5 psi（0.3 atm）氧气压力时，好氧/缺氧MBfR组合在总需氧量通量（即来自COD和NH₄氧化）为1.2 - 7.2 g O₂/m²·d的范围内实现了COD氧化和氮去除，但当总需氧量负荷高于14 g O₂/m²·d时会过载且无法完成硝化作用。总氮去除受Aer MBfR中的硝化作用控制，因为An MBfR对Aer MBfR提供给它的所有NO₃⁻进行了反硝化。总需氧量的过载并未影响Aer MBfR中的COD氧化，但由于可溶性微生物产物（SMP）的净释放，导致An MBfR中的COD略有增加。
