Notes: HRT: hydraulic retention time; TS: total solid; OLR: organic loading rate; Total VFAs: volatile organic acids, sum of acetate, propionate, iso-butyrate, butyrate, iso-valerate, valeric and caproate; ’/’: data not available. All data is shown in average±SD (standard deviation); ‘→’ means the performance range, not stable.

*: First stage: 1-218 days; Recovery stage: 219-230 days; Second stage: 231-252 days

Table 3 Percentage of potential SAOB and HM partners at genus level