title: [Performance of lab-scale SPAC anaerobic bioreactor with high loading rate].
abstract: The performance of a novel anaerobic bioreactor, spiral automatic circulation (SPAC) reactor, was investigated in lab-scale. The results showed that the average COD removal efficiency was 93.6% (91.1%-95.7%), with influent concentration increased from 8000 mg/L to 20 000 mg/L, at 30 degrees C and hydraulic retention time (HRT) of 12 h. The removal efficiency remained at 96.0%-78.7% when HRT was shortened from 5.95 h to 1.57 h, as the influent concentration was kept constantly at 20 000 mg/L. The highest organic loading rate (OLR), volumetric COD removal rate and volumetric biogas production of the SPAC reactor were 306 gCOD/(L x d), 240 g/(L x d) and 131 L/(L x d), respectively. When increasing influent COD concentration (from 8000 mg/L to 20 000 mg/L), the effluent COD concentration maintained at low level (852 mg/L for average) with volumetric COD removal rate increased by 162% and volumetric biogas production increased by 119%. With reduced HRT (from 5.95 h to 1.57 h), the volumetric COD removal rate and volumetric biogas production were increased by 191% and 195%, respectively. The SPAC reactor shows good performances in adapting the continuous change of influent COD and HRT.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Chen
authors.forename: Chongjian
authors.initials: C
authors.lastname: Tang
authors.forename: Ping
authors.initials: P
authors.lastname: Zheng
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D003198:Computer Simulation; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods