pH对腐熟蓝藻微生物燃料电池产电性能的影响  

Effect of pH on power generation in MFC fed with decomposed cyanobacteria at anode chamber

作　　者：陈桂顶[1] 朱光灿[1] 周越[1] 

机构地区：[1]东南大学能源与环境学院环境医学工程教育部重点实验室,江苏南京210096

出　　处：《中南大学学报（自然科学版）》2015年第7期2757-2761,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(21277024)~~

摘　　要：采用双室微生物燃料电池(microbial fuel cell,MFC)装置,以腐熟蓝藻为阳极基质,以氧气为阴极电子受体,考察阳极基质初始pH对MFC产电性能和腐熟蓝藻降解效果的影响。研究结果表明:阳极基质为弱碱性时,可提高电子传递效率,有利于MFC产电。初始pH为8时,MFC最大输出功率密度为3.83 m W/m2,分别是初始pH为6,7和9时的1.46倍、1.18倍和1.58倍,并且pH为8时,COD的去除率达到89.8%。在稳定产电期间,由于阳极H+向阴极迁移的速率高于参与阴极还原反应的消耗速率,导致阴极室内H+积累,使pH持续下降。调控阳极基质pH、提高阴极还原反应速率,在有效降解蓝藻的同时实现电能输出,为蓝藻资源化利用提供了新的途径。The effect of anodic pH on power generation of microbial fuel cell （MFC） and decomposed cyanobacteria treatment was investigated using a traditional two-chamber microbial fuel cell, and decomposed cyanobacteria and oxygen gas as anodic substrate and cathodic electron acceptor, respectively. The results show that the alkalescent anodic substrate is in favor for power generation of MFC due to an efficient electron transfer. Compared to that with the anodic pH of 6, 7 and 9, the maximum power output of 3：83 mW/m2 with anodic pH of 8 is increased by 1.46 times, 1.18 times and 1.58 times, respectively. Moreover, the COD removal rate of 89.6% is achieved with anodic pH of 8. During the stability of electricity generation, the transfer rate of H＋ from anode to cathode is higher than the consumption rate of H＋, which is responsible for accumulation of H＋ in the cathode, resulting in continuous declination of cathodic pH. MFC could be a new approach to simultaneous power generation and decomposed cyanobacteria treatment by controlling the anodic pH and improving the reduction efficiency of cathode.

关 键 词：微生物燃料电池 产电性能 PH 腐熟蓝藻液 

分 类 号：X703[环境科学与工程—环境工程]