title: [Electricity generation by the microbial fuel cells using the supernatant fluid of microwave pretreated sludge as fuel].
abstract: A single-chamber membrane-less microbial fuel cell (MFC) was successfully started up by using the filtrate of sludge pretreated by microwave as substrate. The effects of microwave power and time on the maximum output power density were investigated and the influences of external resistance on the performance of MFC were also analyzed. The results indicated that the electric cycle lasted for nearly 600 h. Under the same microwave power (900 W), the maximum output power density ascend along with the radiation time, and was amount to 210.07 mW x m(-2) as the radiation time reached to 300 s. When radiation time kept constant(300 s), the maximum output power density had a peak on the power of 720 W followed by a gradual decrease with the increase of microwave power. The performance of MFC could be effectively improved by the longer irradiation time and moderate higher microwave power (< 900 W). On the optimal treatment conditions (300 s, 720 W), the maximum output power density could reach up to 306.2 mW x m(-2). When the external resistance was 30 omega, 500 omega, 2000 omega, the coulombic efficiency was 83.3%, 79.0%, 33.6% respectively. The SEM observation showed that the surface of anodic electrode was covered by spherical bacteria at higher external resistance of 2 000 omega. As at lower external resistance of 30 omega, it was covered by several other kinds of bacteria besides spherical bacteria, such as filamentous bacteria and bacilliform bacteria. The coulombic efficiency and microorganisms on the surface of anodic electrode were influenced by the external resistance.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. fanglililucky@163.com
authors.forename: Li
authors.initials: L
authors.lastname: Fang
authors.forename: Zhi-Hua
authors.initials: ZH
authors.lastname: Liu
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Li
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.forename: Yao
authors.initials: Y
authors.lastname: Zheng
authors.forename: Bin
authors.initials: B
authors.lastname: Jia
mesh_terms: D001674:Bioelectric Energy Sources; D003246:Conservation of Energy Resources; D004560:Electricity; D008872:Microwaves; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology
chemical_list: D012722:Sewage