中文摘要：

以微生物电解池为平台，考察了阴极电势，pH以及初始乙酸盐浓度对乙酸还原及其丁酸、乙醇等产物积累的影响．结果显示，恒定阴极电势-900mV（VS．Ag／AgCl）、pH6．0时，初始乙酸钠浓度为1．0g／L时，丁酸产量最高，可达到80（±5）mg／L，乙醇积累26（±5）mg／L．在-900mV阴极电势下，总碳回收率达到63．2％，产物电子回收率为13．06％；在-800mV阴极电势下，总碳回收率达到42．8％，产物电子回收率为54．4％．控制阴极电势-850mV，初始乙酸钠浓度由1g／L增加到5g／L，丁酸的产量由48．8mg／L增加到76．2mg／L，提高了56％．扫描电镜显示，阴极碳毡上菌体主要为杆菌．对阴极附着微生物进行变性梯度凝胶电泳（PCR—DGGE）分析发现，假单胞菌属（Pseudomonas）和梭菌属（Clostridium）为主要的功能菌群，假单胞菌可能与阴极电子传递有关，而梭菌可能与高值有机物的合成有关．

英文摘要：

The effect of cathode, pH and initial concentration ot acetate on ttae acetate reaucuon ano me accumulation of butyrate, ethanol and other products were studied taking microbial electrochemical tech- nology as a platform. In the batch test of biocathode potential, the highest production rate of butyrate and ethanol was 80 （ 4± 5） mg/L and 26 （ ±5） mg/L （at potential-900 mV）. Electron and carbon bal- ances revealed that the cathodic carbon efficiency and electron efficiency was 63.2% and 13.06% at po- tential of -900 inV. At potential of -800 mV, the cathodic carbon efficiency and electron efficiency was 42.8% and 54.4%, respectively. Batch test of pH indicated that pH6.0 was the best condition of pro- ducing high value organics. At the potential of -850 mV, the yield of butyrate increased from 48. 8mg/ L to 76.2mg/L, the concentration of butyrate increased by 56% from I g/L to 5 g/L sodium acetate. SEM showed the cathodes mainly included rod-shaped organism. PCR-DGGE revealed that Pseudomonas and Clostridium were dominant populations. transfer, and clostridium may be associated Pseudomonas may be associated with the cathode electron with the synthesis of high value organics.