Enhanced anaerobic co-digestion performance by using surface-annealed titanium spheres at different atmospheres.
A series of surface-annealed titanium spheres (Ti-A, Ti-B, and Ti-C) in different atmospheres were used as accelerants in anaerobic co-digestion (AcoD) systems under magnetic field (MF). Surface-annealed titanium spheres and MF exhibit remarkable coupling and promoting effects on the AcoD performance. The cumulative biogas yield (435.84-552.60 mL/g VS) and total chemical oxygen demand (COD) degradation efficiency (59.76%-71.28%) of the AcoD systems with TiMF, Ti-AMF, Ti-BMF, and Ti-CMF were significantly higher than control (357.66 mL/g VS and 51.5%). The digestates of the AcoD system with surface-annealed Ti spheres delivered excellent stability (49.83%-59.90%) and fertilizer (4.21%-4.56%). This work clarifies the possible role of surface-annealed Ti spheres in enhancing methanogenesis.
['Ke|Teng|T|', 'Yun|Sining|S|', 'Wang|Kaijun|K|', 'An|Jinhang|J|', 'Liu|Lijianan|L|', 'Liu|Jiayu|J|']
Anaerobic co-digestion Surface-annealed titanium spheres Magnetic field Biogas yield Fertilizer utilization