Chen Sheng, Sun Dezhi, Chung Jong-Shik
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China.
J Hazard Mater. 2009 Sep 30;169(1-3):575-80. doi: 10.1016/j.jhazmat.2009.03.132. Epub 2009 Apr 5.
Wastewater containing highly concentrated nitrogenous and aromatic compounds, such as aniline, is difficult to degrade and very toxic to microorganisms, especially to nitrifier. In order to remove both carbon and nitrogen from aniline wastewater, recently two biofilm reactors equipped with anaerobic-aerobic cycle and internal recirculation have demonstrated some potential in treating the wastewater. In such system, ammonification, methanogenesis and denitrification reactions occurred simultaneously in one anaerobic reactor, followed by COD removal and nitrification in the aerobic reactor. The effect of recirculation ratio on COD and nitrogen removal using such reactor arrangement was therefore investigated in the present work. The results showed that recirculation had little impact on the overall COD removal or denitrification activity in the anaerobic reactor at any tested ratio, 96-98% of overall COD removal efficiency was achieved with a final effluent COD value below 200mg/L. But nitrification and TN removal were strongly affected by recirculation. The nitrification rate reached a maximum of 0.48 kg N/(m(3)d) at recirculation ratio of 1 and complete nitrification was achieved at the recirculation ratios over 2. TN removal efficiency increased continuously and a sharp reduction of sludge production in the system was observed with increasing recirculation.
含有高浓度含氮和芳香族化合物（如苯胺）的废水难以降解，且对微生物，尤其是对硝化细菌毒性很大。为了从苯胺废水中同时去除碳和氮，最近两个配备厌氧-好氧循环和内部循环的生物膜反应器在处理该废水方面展现出了一定潜力。在这样的系统中，氨化、甲烷生成和反硝化反应在一个厌氧反应器中同时发生，随后在好氧反应器中进行化学需氧量（COD）去除和硝化。因此，本研究考察了循环比对于采用这种反应器配置去除COD和氮的影响。结果表明，在任何测试的循环比下，循环对厌氧反应器中的总COD去除或反硝化活性影响不大，最终出水COD值低于200mg/L时，总COD去除效率达到96-98%。但硝化和总氮（TN）去除受到循环的强烈影响。在循环比为1时，硝化速率最高达到0.48kg N/(m³·d)，在循环比超过2时实现了完全硝化。随着循环增加，TN去除效率持续提高，且系统中污泥产量大幅减少。
