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Table 1 Parameters used in model and their correspondent values

From: Modeling de novo granulation of anaerobic sludge

Parameter summary
Model parameter Symbol Value Unit References
Solutes
Diffusion of glucose in liquid D g 5.8×10−6 m 2 /day [59]
Diffusion of acetate in liquid D a 1.05×10−4 m 2 /day [59]
Diffusion of methane in liquid D m 1.29×10−4 m 2 /day [60]
Biofilm Diffusivity γ 30 % [42]
Acidogens
Cell mass B a 300 fg [61]
Division radius   3 μm [62]
Maximum growth rate \(\hat {\mu _{a}}\) 0.208 h −1 [61], [56, 63]
Substrate saturation constant Ks 0.26 g/L [35, 56]
Product inhibition constant Ki 0.1 g/L [56, 63]
Biomass conversion rate α bg 0.3 \(\frac {g_{biomass}}{g_{glucose}}\) [56, 57]
Substrate conversion rate α ag 0.82 \(\frac {g_{acetate}}{g_{glucose}}\) [56, 63]
Death delay   48 h Estimated
Death threshold   0.02 g/L Estimated
Methanogens
Cell mass B m 1500 fg [62]
Mass of EPS capsule   10 fg [54]
Division radius   3 μm [62]
Maximum growth rate \(\hat {\mu _{m}}\) 0.1 h −1 [33, 54]
Substrate saturation constant Ks 0.005 g/L [54]
Biomass conversion rate α ba 0.15 \( \frac {g_{biomass}}{g_{acetate}}\) [33, 35]
Substrate conversion rate α ma 0.26 \(\frac {g_{methane}}{g_{acetate}}\) [33]
Death delay   48 h Estimated
Death threshold   0.00001 g/L Estimated