Table 11 Different timely periods according to changes of hydraulic retention time (HRT) and substrate characteristics performed in the experiments [26]
Period | Relevant changes in the process made in this period | Reactor 1 | Reactors 2–4 | ||
|---|---|---|---|---|---|
HRT | Loading rate | HRT | Loading rate | ||
days | kg FM/m3*day | days | kg FM/m3*day | ||
Period I | LJ1 in reactors 3 and 4 | 20 | 50 | 55 | 18.18 |
Period II | Change of HRT from 55 to 40 days in reactors 2–4; reactor 2 only fed with BW between day 61 and 75a | 20 | 50 | 40 | 25.00 |
Period III | Use of LJ 2 with low VS, COD and TOC content (Table 4) in reactors 3 and 4 | 20 | 50 | 40 | 25.00 |