Chen T K, Ni C H, Chen J N, Lin J
Institute of Environmental Engineering, National Chiao Tung University, No. 75, Poai Street, Hsinchu 300, Chinese Taiwan.
Water Sci Technol. 2003;48(1):191-8.
The membrane bioreactor (MBR) system has become more and more attractive in the field of wastewater treatment. It is particularly attractive in situations where long solids retention times are required, such as nitrifying bacteria, and physical retention critical to achieving more efficiency for biological degradation of pollutant. Although it is a new technology, the MBR process has been applied for industrial wastewater treatment for only the past decade. The opto-electronic industry, developed very fast over the past decade in the world, is high technology manufacturing. The treatment of the opto-electronic industrial wastewater containing a significant quantity of organic nitrogen compounds with a ratio over 95% in organic nitrogen (Org-N) to total nitrogen (T-N) is very difficult to meet the discharge limits. This research is mainly to discuss the treatment capacity of high-strength organic nitrogen wastewater, and to investigate the capabilities of the MBR process. A 5 m3/day capacity of MBR pilot plant consisted of anoxic, aerobic and membrane bioreactor was installed for evaluation. The operation was continued for 150 days. Over the whole experimental period, a satisfactory organic removal performance was achieved. The COD could be removed with an average of over 94.5%. For TOC and BOD5 items, the average removal efficiencies were 96.3 and 97.6%, respectively. The nitrification and denitrification was also successfully achieved. Furthermore, the effluent did not contain any suspended solids. Only a small concentration of ammonia nitrogen was found in the effluent. The stable effluent quality and satisfactory removal performance mentioned above were ensured by the efficient interception performance of the membrane device incorporated within the biological reactor. The MBR system shows promise as a means of treating very high organic nitrogen wastewater without dilution. The effluent of TKN, NOx-N and COD can fall below 20 mg/L, 30 mg/L and 50 mg/L.
膜生物反应器（MBR）系统在污水处理领域越来越具有吸引力。在需要较长固体停留时间的情况下，如硝化细菌，以及对提高污染物生物降解效率至关重要的物理截留方面，它尤其具有吸引力。尽管它是一项新技术，但MBR工艺在过去十年才被应用于工业废水处理。过去十年在全球发展非常迅速的光电产业是高科技制造业。处理含有大量有机氮化合物（有机氮（Org-N）与总氮（T-N）的比例超过95%）的光电工业废水很难达到排放限值。本研究主要讨论高强度有机氮废水的处理能力，并研究MBR工艺的性能。安装了一个5立方米/天处理能力的MBR中试装置，该装置由缺氧、好氧和膜生物反应器组成，用于评估。运行持续了150天。在整个实验期间，实现了令人满意的有机物去除性能。COD平均去除率超过94.5%。对于TOC和BOD5项目，平均去除效率分别为96.3%和97.6%。硝化和反硝化也成功实现。此外，出水不含有任何悬浮固体。出水中仅发现少量氨氮。生物反应器内的膜装置的高效截留性能确保了上述稳定的出水水质和令人满意的去除性能。MBR系统有望成为一种无需稀释即可处理高浓度有机氮废水的方法。总凯氏氮（TKN）、硝态氮（NOx-N）和COD的出水浓度可降至20毫克/升、30毫克/升和50毫克/升以下。
