Oh Sang Eun, Logan Bruce E
Department of Civil and Environmental Engineering, the Pennsylvania State University, University Park, PA 16802, USA.
Water Res. 2005 Nov;39(19):4673-82. doi: 10.1016/j.watres.2005.09.019.
Hydrogen can be produced from fermentation of sugars in wastewaters, but much of the organic matter remains in solution. We demonstrate here that hydrogen production from a food processing wastewater high in sugar can be linked to electricity generation using a microbial fuel cell (MFC) to achieve more effective wastewater treatment. Grab samples were taken from: plant effluent at two different times during the day (Effluents 1 and 2; 735+/-15 and 3250+/-90 mg-COD/L), an equalization tank (Lagoon; 1670+/-50mg-COD/L), and waste stream containing a high concentration of organic matter (Cereal; 8920+/-150 mg-COD/L). Hydrogen production from the Lagoon and effluent samples was low, with 64+/-16 mL of hydrogen per liter of wastewater (mL/L) for Effluent 1, 21+/-18 mL/L for Effluent 2, and 16+/-2 mL/L for the Lagoon sample. There was substantially greater hydrogen production using the Cereal wastewater (210+/-56 mL/L). Assuming a theoretical maximum yield of 4 mol of hydrogen per mol of glucose, hydrogen yields were 0.61-0.79 mol/mol for the Cereal wastewater, and ranged from 1 to 2.52 mol/mol for the other samples. This suggests a strategy for hydrogen recovery from wastewater based on targeting high-COD and high-sugar wastewaters, recognizing that sugar content alone is an insufficient predictor of hydrogen yields. Preliminary tests with the Cereal wastewater (diluted to 595 mg-COD/L) in a two-chambered MFC demonstrated a maximum of 81+/-7 mW/m(2) (normalized to the anode surface area), or 25+/-2 mA per liter of wastewater, and a final COD of <30 mg/L (95% removal). Using a one-chambered MFC and pre-fermented wastewater, the maximum power density was 371+/-10 mW/m(2) (53.5+/-1.4 mA per liter of wastewater). These results suggest that it is feasible to link biological hydrogen production and electricity producing using MFCs in order to achieve both wastewater treatment and bioenergy production.
氢气可通过废水中糖类的发酵产生，但大部分有机物仍溶解在溶液中。我们在此证明，利用微生物燃料电池（MFC），可将富含糖分的食品加工废水制氢与发电联系起来，以实现更有效的废水处理。采集了以下水样：一天中两个不同时间的工厂废水（废水1和废水2；化学需氧量分别为735±15和3250±90mg/L）、一个均衡池（泻湖；化学需氧量为1670±50mg/L）以及含有高浓度有机物的废物流（谷物废水；化学需氧量为8920±150mg/L）。泻湖和废水样本的产氢量较低，废水1每升废水产氢64±16毫升（mL/L），废水2为21±18mL/L，泻湖样本为16±2mL/L。谷物废水的产氢量则大幅更高（210±56mL/L）。假设每摩尔葡萄糖的理论最大产氢量为4摩尔，谷物废水的产氢率为0.61 - 0.79摩尔/摩尔，其他样本的产氢率在1至2.52摩尔/摩尔之间。这表明基于针对高化学需氧量和高糖废水的策略从废水中回收氢气，同时认识到仅糖含量不足以预测产氢率。在两室MFC中对谷物废水（稀释至595mg/L化学需氧量）进行的初步测试表明，最大功率为81±7mW/m²（基于阳极表面积归一化），即每升废水25±2毫安，最终化学需氧量<30mg/L（去除率95%）。使用一室MFC和预发酵废水时，最大功率密度为371±10mW/m²（每升废水53.5±1.4毫安）。这些结果表明，利用MFC将生物制氢与发电联系起来以实现废水处理和生物能源生产是可行的。
