CFD simulation of the laboratory-scale anaerobic digester to study the impacts of impeller geometric and operational parameters on its performance

This research numerically surveys the effects of several main parameters an agitated anaerobic digester on mixing rate and power input. The numerical simulation is handled applying finite volume method (FVM), it validated with available experimental data. results indicate that doubling blade length enhances by 39.9% makes input enhance 13.5 times; increasing number blades (from 4 to 6) improves 12.5% grow 1.4 times, decreasing tilt angle from 45° 30° causes drop 14% decreases 1.8 times. Furthermore, observations show are adversely influenced wastewater concentration. At last, most effective impeller design, among 144 cases investigated, found out suggested.