Journal
BIORESOURCE TECHNOLOGY
Volume 284, Issue -, Pages 315-324Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.03.146
Keywords
Sludge; Anaerobic digestion; Microbial electrolysis cells; Biochar; Electron transfer
Funding
- Program of Distinguished Professor (Eastern Scholar) at Shanghai Institutions of Higher Learning, Shanghai Pujiang Program [18PJ1406300]
- National Natural Science Foundation of China [21876110]
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The development of microbial electrolysis cells (MECs) for methane production from waste activated sludge (WAS) is arrested due to the limited methane yield and fragile system stability. This study proposed a strategy to accelerate and stabilize MEC via 1.0 g/g DM (dry matter) sludge-based biochar (BC). The results showed that BC clearly accelerated methane production by 24.7% and enhanced VS removal efficiency by 17.9%, compared to control group. Variations of SCOD, proteins, carbohydrates and VFAs indicated biochar promoted hydrolysis and acidogenesis process. Cyclic voltammetry (CV) curves and coulombic efficiency (CE) suggested organic matters degradation and electron generation on anode were enhanced with supplement of biochar. Microbial community analyses revealed that biochar addition could both promote DIET through substituting exoelectrogen (e.g., Thermincola) on anode and enrich hydrogenotrophic methanogens (e.g., Methanothermobacter) on cathode, which is beneficial to development of MEC as to methane recovery from organic matters.
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