Table 2 Methane yield, methane production rate and lag-phase time in the semi-continuous subculture.
From: Magnetite nanoparticles facilitate methane production from ethanol via acting as electron acceptors
|  | Ps (mol CH4/mol ethanol) | Rm (mmol/d) | λ(d) | R2 |
|---|---|---|---|---|
PEC-HZ | ||||
 Start-up | 1.52 | 0.08 | 26.3 | 0.96 |
 Generation l | 0.29 | 0.004 | 4.9 | 0.95 |
 Generation 2 | 0.38 | 0.01 | 8.9 | 0.99 |
PEM-HZ | ||||
 Start-up | 1.64 | 0.20 | 8.1 | 0.99 |
 Generation l | 1.52 | 0.11 | 3.0 | 0.99 |
 Generation 2 | 1.59 | 0.07 | 0.9 | 0.99 |
