An Yingyu, Yang Fenglin, Chua Hwee Chuan, Wong Fook Sin, Wu Bing
School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
Bioresour Technol. 2008 Jun;99(9):3714-20. doi: 10.1016/j.biortech.2007.07.020. Epub 2007 Aug 20.
A combined system consisting of an up-flow anaerobic sludge blanket (UASB) and an aerobic membrane bioreactor (MBR) was operated at 28-30 degrees C and pH 7.8-8.1 for the treatment of low-strength synthetic wastewater enriched with organic carbon and NH4Cl. The MBR slurry was recirculated into the UASB with a ratio of 50-800%. It was found that nitrite was able to accumulate steadily during the nitrification step in the MBR at a low TOC/NH4+-N ratio. The mixed liquid containing NOX(-)-N in the MBR was recirculated to the UASB, and denitrification rather than methanogenesis became the preferred pathway. Whereas, the less carbon requirement for denitrification via nitrite rather than nitrate allowed methanogenesis to proceed simultaneously in the same reactor. The combination of membrane filtration and partial nitrification in the MBR with simultaneous denitrification and methanogenesis in the UASB could stably reach 98% TOC removal and 48.1-82.8% TN removal with recirculation ratio increasing from 50% to 800%.
一个由上流式厌氧污泥床（UASB）和好氧膜生物反应器（MBR）组成的联合系统，在28 - 30摄氏度、pH值7.8 - 8.1的条件下运行，用于处理富含有机碳和氯化铵的低强度合成废水。MBR的污泥混合液以50 - 800%的比例回流至UASB。研究发现，在MBR中硝化步骤期间，当TOC/NH4⁺-N比例较低时，亚硝酸盐能够稳定积累。MBR中含有NOX⁻-N的混合液回流至UASB，反硝化而非产甲烷成为主要途径。然而，与通过硝酸盐进行反硝化相比，通过亚硝酸盐进行反硝化所需的碳更少，这使得产甲烷能够在同一反应器中同时进行。随着回流比从50%增加到800%，MBR中的膜过滤和部分硝化与UASB中的同步反硝化和产甲烷相结合，能够稳定实现98%的TOC去除率和48.1 - 82.8%的TN去除率。
