Side-Stream Enhanced Biological Phosphorus Removal (S2EBPR) enables effective phosphorus removal in a pilot-scale A-B stage shortcut nitrogen removal system for mainstream municipal wastewater treatment

Minimizing biological sludge generation in a sidestream enhanced biological phosphorus removal (S2EBPR) system: full-scale evaluation and modeling insights

“…Consequently, the two systems were operated under similar biomass concentration and SRT conditions. The SRT of the S2EBPR system was similar to that applied by Taotao Lv et al 28 and Wang et al 14 of 12.6–19.7 days and 9.7 days, respectively.…”

“…In previous studies S2EBPR was implemented at low and moderate SRT (<20 days). 11,13,14,28 Consequently, there is no available evidence regarding the effects of the prolonged SRT on the S2EBPR system performances in removing OP. Previous studies on conventional EBPR reported that a prolonged SRT (16-40 days) could be detrimental for OP removal due to the higher competitiveness of GAO at prolonged SRT.…”

“…The system was operated with intermittent mixing and the addition of external carbon to the SSR. 13,14 In a previous experimental campaign at the Calumet WRP, the impact of mixing and external carbon addition on P removal using the S2EBPR system was investigated. 10 The S2EBPR process configuration closely resembles the OSA process, commonly applied for promoting sludge reduction.…”

“…4,21,22 Although there are existing reports on pilotand full-scale OSA-like systems in the literature, [23][24][25] previous studies did not report the effect of implementing the S2EBPR system on sludge production. 11,13,14 Moreover, the effect of the tested operational conditions at the Calumet WRP on sludge production has not been investigated yet. This aspect could be of significant interest for optimizing a process that combines P removal and sludge minimization.…”