生物膜接触氧化法处理苯胺废水

以AN3菌和硝化类细菌构成的复合生物膜降解苯胺 ,研究挂膜过程中苯胺代谢产物的变化情况、生物膜内异养菌与硝化类细菌生态分布情况 ,以及水质条件对苯胺代谢速率的影响 .结果表明 ,挂膜期间苯胺中的氮首先被降解成氨 ,然后进一步生成亚硝酸根或硝酸根 .反应器内的稳定生物膜主要由AN3菌构成 ,但靠近出水位置生物膜中的硝化类细菌密度较进水位置高 10 0倍以上 .生物膜代谢的最佳pH值范围是 6 9— 7 5 .重金属离子 ,尤其是Hg2 ,通常会对生物膜的代谢活性产生抑制作用

Treatment of aniline by contact biological oxidation on the biofilm

Biological oxidation of aniline in a contact biological oxidation system, consisting of AN3 bacteria and a small part of nitrifying bacteria, was studied.The degradation products, microorganism population dynamics in the axial direction and influences of pH, concentrations of heavy metal ions on the rate of metabolic transformation of aniline during the development of the biofilm were investigated.The results indicated that the aniline was first degraded to NH⁺₄, then to No^-₂ or No^-₃ during biofilm development.The density of nitrifying bacteria near the effluent was hundred times higher than that near the influent.The optimum pH for the metabolism of AN3 bacteria on the biofilm was in the range of 6.9-7.5.Heavy metal ions, especially Hg²⁺, inhibited the metabolism of the bacteria.