Environment Canada, Water Science and Technology Directorate, 867 Lakeshore Road, P.O. Box 5050, Burlington, ON, L7R 4A6, Canada.
Water Environ Res. 2011 Jan;83(1):3-14. doi: 10.2175/106143009x12487095236991.
An alternative design of the membrane aerated biofilm reactor (MABR) was developed to overcome some of the current technical and economical limitations preventing full scale applications of the process. The ZeeLung system uses a new dense hollow-fibre membrane with an unprecedented thin diameter. Two pilot units treating a synthetic high-strength industrial wastewater (4700 mgCOD/L, 145 mgTKN/L) operated successfully for 16 months. They performed simultaneous COD removal, nitrification and denitrification. The very high specific surface area (810 m2/m3) allowed the surface loading rate to be kept low enough (3.6 gCOD/(m2.d)) to maintain a relatively thin biofilm (200 to 350 microm) and use low-pressure air (41 kPa) instead of high-pressure pure oxygen. Intermittent air and liquid mixing at high frequency and low shear were compared: they were equally effective in enhancing substrate transfer, but failed to stabilize biofilm accumulation. Air sparging additionally prevented the acidification of the bulk by stripping CO2.
开发了一种膜曝气生物膜反应器（MABR）的替代设计，以克服当前阻止该工艺全面应用的一些技术和经济限制。ZeeLung 系统使用了一种具有前所未有的超细直径的新型致密中空纤维膜。两个处理合成高强度工业废水（4700mgCOD/L，145mgTKN/L）的中试装置成功运行了 16 个月。它们同时进行 COD 去除、硝化和反硝化。极高的比表面积（810m2/m3）使表面负荷率保持在足够低的水平（3.6gCOD/（m2.d）），以保持相对较薄的生物膜（200 至 350μm）并使用低压空气（41kPa）代替高压纯氧。高频低剪切的间歇式空气和液体混合进行了比较：它们在增强基质传递方面同样有效，但未能稳定生物膜的积累。空气喷射还通过汽提 CO2 防止主体酸化。
