Feng Yujie, Wang Xin, Logan Bruce E, Lee He
Department of Environmental Science and Engineering, Harbin Institute of Technology, No 202, Haihe Road, Nangang District, Harbin 150090, China.
Appl Microbiol Biotechnol. 2008 Apr;78(5):873-80. doi: 10.1007/s00253-008-1360-2. Epub 2008 Feb 2.
Effective wastewater treatment using microbial fuel cells (MFCs) will require a better understanding of how operational parameters and solution chemistry affect treatment efficiency, but few studies have examined power generation using actual wastewaters. The efficiency of wastewater treatment of a beer brewery wastewater was examined here in terms of maximum power densities, Coulombic efficiencies (CEs), and chemical oxygen demand (COD) removal as a function of temperature and wastewater strength. Decreasing the temperature from 30 degrees C to 20 degrees C reduced the maximum power density from 205 mW/m2 (5.1 W/m3, 0.76 A/m2; 30 degrees C) to 170 mW/m2 (20 degrees C). COD removals (R COD) and CEs decreased only slightly with temperature. The buffering capacity strongly affected reactor performance. The addition of a 50-mM phosphate buffer increased power output by 136% to 438 mW/m2, and 200 mM buffer increased power by 158% to 528 mW/m2. In the absence of salts (NaCl), maximum power output varied linearly with wastewater strength (84 to 2,240 mg COD/L) from 29 to 205 mW/m2. When NaCl was added to increase conductivity, power output followed a Monod-like relationship with wastewater strength. The maximum power (P max) increased in proportion to the solution conductivity, but the half-saturation constant was relatively unaffected and showed no correlation to solution conductivity. These results show that brewery wastewater can be effectively treated using MFCs, but that achievable power densities will depend on wastewater strength, solution conductivity, and buffering capacity.
利用微生物燃料电池（MFC）进行有效的废水处理需要更好地理解操作参数和溶液化学性质如何影响处理效率，但很少有研究考察使用实际废水时的发电情况。本文从最大功率密度、库仑效率（CE）以及作为温度和废水强度函数的化学需氧量（COD）去除率方面，考察了啤酒厂废水的处理效率。将温度从30℃降至20℃，最大功率密度从205 mW/m²（5.1 W/m³，0.76 A/m²；30℃）降至170 mW/m²（20℃）。COD去除率（R COD）和CE仅随温度略有下降。缓冲能力对反应器性能有强烈影响。添加50 mM的磷酸盐缓冲液可使功率输出提高136%，达到438 mW/m²，添加200 mM缓冲液可使功率提高158%，达到528 mW/m²。在无盐（NaCl）情况下，最大功率输出随废水强度（84至2240 mg COD/L）从29 mW/m²线性变化至205 mW/m²。当添加NaCl以提高电导率时，功率输出与废水强度呈现类似莫诺德关系。最大功率（P max）与溶液电导率成比例增加，但半饱和常数相对不受影响，且与溶液电导率无相关性。这些结果表明，利用MFC可以有效处理啤酒厂废水，但可实现的功率密度将取决于废水强度、溶液电导率和缓冲能力。
