硝基苯厌氧降解过程中Fe^0的促进作用

THE ACCELERATIVE EFFECT of Fe ~0 on ANAEROBIC DEGRADATION NITROBENZENE-CONTANING WASTE WATER

尝试在硝基苯生物厌氧降解过程中,添加零价铁实现电子催化与生物代谢的协同作用,结果发现零价铁能够促进硝基苯的厌氧转化并主要生成苯胺,初始浓度为240.00mg·l-1的硝基苯废水,当厌氧微生物浓度为5000.00mg·l-1左右时,在2L的试验液中,当零价铁投加量由0.50g增加到5.00g时,硝基苯的转化率和苯胺的产生量急剧增加;零价铁的投加量为5.00g时与不加零价铁相比,硝基苯的转化率提高了2.43倍,苯胺的生成量提高了2.12倍;通过设计Fe0,Fe2+,Fe3+及Fe3O4的对比实验,证明零价铁的作用主要表现为其腐蚀形成Fe2+的过程为硝基苯的厌氧生物转化提供了电子以及该过程中生成的Fe2+和Fe3+的生物营养作用.

Nitrobenzene aerobic degradation is very difficult for it＇s group-NO^2 ＇s strong ability of attracting electron, and the familiar bioanaerobic degradation process last for too long time to be practically used. So we added zero valent iron into the bioanaerobic uint and measured the concentration change of nitrobenzene and aniline, in order to investigate the cooperating effect of iron＇s electron catalysis and biology metaboly. The results show that Fe^2＋ can accelerate the anaerobic degradation process and the primary production was aniline. When the original pollutant concentration was 240. 00mg·l^-1 and anaerobic microorganism concentration was about 5000. 00 mg· l^-1 ,the nitrobenzene removal rate and aniline yield rose sharply with the increasing of Fe^0 from 0. 5g to 5.0g in the 2L reaction unit. Compared with the degradation results without Fe^0, the NB＇ s removal rate increased 2. 43 times and aniline yield increased 2. 12 times while adding 5. 00g Fe^0 in the process. The test of adding Fe^0 contrasted with adding Fe^2＋ , Fe^3＋ and Fe^3O4 showed that： the primary effect of Fe^0 accelerate nitrobenzene degradation was the process that Fe^0 rusted to Fe^2 ＋ afforded electron which nitrobenzene degradation needed, and the formed Fe^2＋ and Fe^3＋ provided mineral nutrient for anaerobic microorganism.