Sampling the influent and effluent to each cell allowed us to evaluate
the ABR performance in terms of hydraulic residence time
(HRT) of 3, 6, 9 and 12 h. The average concentrations of influent TSS
and the effluent for each cell are presented in Fig. 3 with the
standard deviation for the 2-year period. The first cell removed
75 ± 15% of the influent TSS with only 3 h of HRT. No apparent
correlation was observed between TSS removal and water temperature
(R2 < 0.1; p < 1). Volatile Suspended Solids (VSS) averaged
82 ± 13% of the TSS and exhibited the same trends as TSS over the 2-
year period and with hydraulic residence time.