Abstract: Bed expansion behavior and sensitivity analysis for super-high-rate anaerobic bioreactor (SAB) were performed based on bed expansion ratio (E), maximum bed sludge content (V_pmax), and maximum bed contact time between sludge and liquid (τ_max). Bed expansion behavior models were established under bed unfluidization, fluidization, and transportation states. Under unfluidization state, E was 0, V_pmax was 4 867 ml, and τ_max was 844–3 800 s. Under fluidization state, E, V_pmax, and τ_max were 5.28%–255.69%, 1 368–4 559 ml, and 104–732 s, respectively. Under transportation state, washout of granular sludge occurred and destabilized the SAB. During stable running of SAB under fluidization state, E correlated positively with superficial gas and liquid velocities (u_g and u_l), while V_pmax and τ_max correlated negatively. For E and V_pmax, the sensitivities of u_g and u_l were close to each other, while for τ_max, the sensitivity of u_l was greater than that of u_g. The prediction from these models was a close match to the experimental data.

Key words: Anaerobic bioreactor, Expansion behaviors, Bed expansion ratio, Fluidization state, Sensitivity analysis

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