Enhanced biogas production and biodegradation of phenanthrene in wastewater sludge treated anaerobic digestion reactors fitted with a bioelectrode system
메타 데이터
바이오화학분류
바이오정밀화학
연료
논문
Enhanced biogas production and biodegradation of phenanthrene in wastewater sludge treated anaerobic digestion reactors fitted with a bioelectrode system
학술지
Chemical engineering journal
저자명
Lin, Chaoba; Wu, Ping; Liu, Yongdi; Wong, Jonathan W.C.; Yong, Xiaoyu; Wu, Xiayuan; Xie, Xinxin; Jia, Honghua; Zhou, Jun
초록
<P><B>Abstract</B></P> <P>The purpose of this study was to investigate the enhanced biogas production and biodegradation of phenanthrene in sludge treated anaerobic digestion (AD) reactors fitted with a bioelectrode system (AD-MEC reactors). Different cathodes were considered for installation in the AD-MEC reactor. The result showed that the maximum methane yield (113.45 L/kg TS) and the highest phenanthrene degradation rate (52.3%) were obtained in a reactor with a carbon paper (CP) cathode; this performance was 30.5% and 83.5% greater, respectively, than that in the AD control reactor. <I>Clostridia</I> spp., bacteria that degrade pollutants, were specifically adsorbed onto the electrodes, and <I>Methanosaeta</I> spp. and <I>Geobacter</I> spp. were enriched on the anode. These results implied that a potential direct electron transfer occurred between <I>Methanosaeta</I> and <I>Geobacter</I>. Two hydrogenotrophic methanogens (<I>Methanospirillum</I> spp. and <I>Methanobacterium</I> spp.) were enriched on the surface of the cathode, which enhanced interspecies H<SUB>2</SUB> transfer in the AD-MEC reactors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A bioelectrochemical process was used in an AD system for phenanthrene removal. </LI> <LI> SCOD can increase the bio-availability of phenanthrene. </LI> <LI> Carbon-based cathodes mainly enhance direct electron transfer (DIET) in the system. </LI> <LI> Carbon-based cathodes exhibit high adsorption to microbes. </LI> <LI> Metallic cathodes mainly enhance H<SUB>2</SUB> transfer in the system. </LI> </UL> </P>