Table 2. Operational performance parameters.
| Reactor | Cellulose degradation | pCOD | sCOD | VFA | CH4 production rate | |||||
|---|---|---|---|---|---|---|---|---|---|---|
|
(%) |
(mg COD per l) |
(mg COD per l) |
(mg CODVFA
per l) |
(mg CODCH4
per l per day) |
||||||
| Phase 2 | Phase 3 | Phase 2 | Phase 3 | Phase 2 | Phase 3 | Phase 2 | Phase 3 | Phase 2 | Phase 3 | |
| AD1 | 77±5 | 76±7 | 1200±240 | 1300±310 | 990±370 | 410±90 | 750±340 | 70±70 | 250±48 | 450±132 |
| AD2 | 80±4 | 81±10 | 1100±190 | 1000±510 | 550±260 | 390±120 | 290±220 | 40±20 | 360±83 | 420±137 |
| AD3 | 76±7 | 78±8 | 1300±350 | 1200±400 | 520±230 | 310±80 | 320±160 | 30±20 | 410±68 | 380±124 |
Abbreviations: AD, anaerobic digestion; pCOD, particulate chemical oxygen demand; sCOD, soluble chemical oxygen demand; VFA, volatile fatty acids.
The average values of all performance parameters are given for AD1, AD2 and AD3 during stable hydrolysis and steady-state performance (average values and s.d. for phases 2 and 3): cellulose degradation, pCOD, sCOD and VFA concentrations and methane production rate.