2 1 83
Home About us MoEF Contact us Sitemap Tamil Website  
About Envis
Whats New
Microorganisms
Research on Microbes
Database
Bibliography
Publications
Library
E-Resources
Microbiology Experts
Events
Online Submission
Access Statistics

Site Visitors

blog tracking


 
Biochemical Engineering Journal
Vol. 111, 2016, Pages: 1–9

Enriching functional microbes with electrode to accelerate the decomposition of complex substrates during anaerobic digestion of municipal sludge

Zhiqiang Zhao, Yaobin Zhang, Weican Ma, Jiaqi Sun, Songlan Sun, Xie Quan

Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.

Abstract

Methane-production microbial electrolysis cells (MECs) have been widely reported as an efficient strategy to enhance anaerobic digestion of waste activated sludge (WAS). However, the primary mechanism for accelerating the decomposition of complex substrates contained in WAS remains unclear as so far. In this study anaerobic sludge digestion operated in a single-chamber methane-production MEC was investigated. It was found that the decomposition rate of proteins and carbohydrates were significantly accelerated in MEC, which resulted in the improvement of methane production as compared with the common anaerobic sludge digester. The energy income from the increased methane production was equivalent to 13.4 times as more as the electric energy supply. Further bacterial community analysis showed that anaerobic fermentative bacteria were largely enriched in MEC especially its anodic biofilm. Together with anodic exoelectrogenic bacteria (mainly Geobacter species) accounting for the dominant part of bacterial community in the anodic biofilm, it was suggested that the potential for syntrophic interaction between anaerobic fermentative bacteria and anodic exoelectrogenic bacteria enriched might be the important reason for accelerating the decomposition of complex substrates contained in WAS, which further resulted in the high-efficiency methane production as well as energy recovery.

Keywords: Municipal sludge decomposition; Microbial electrolysis cells (MECs); Biodegradation; Waste treatment; Biogas; Anaerobic processes.

 
Copyright © 2005 ENVIS Centre ! All rights reserved
This site is optimized for 1024 x 768 screen resolution