RT Journal Article
T1 Techno-economic evaluation of ozone application to reduce sludge production in small urban WWTPs
A1 Crutchik, Dafne
A1 Franchi, Óscar
A1 Jeison, David
A1 Vidal, Gladys
A1 Pinto, Alicia
A1 Pedrouso Fuentes, Alba
A1 Campos, José Luis
K1 Disintegration process
K1 Ozonation
K1 Sludge reduction
K1 Sludge retention time
AB In Chile, small wastewater treatment plants (WWTPs) (treatment capacity of less than4,800 m3/d) are normally not designed with consideration for the potential valorization of generated sludge. For this reason, they are generally operated at high solids residence times (SRT) (15 d) to promote the decay of biomass, promoting less sludge production and reducing the costs associated with biomass management. Operation at high SRT implies the need for a larger activated sludge system, increasing capital costs. The implementation of a sludge-disintegration unit by ozonation in future WWTPs could enable operation at an SRT of 3 d, with low sludge generation. In this work, we evaluate how the implementation of a sludge-ozonation system in small WWTPs (200–4000 m3/d) would affect treatment costs. Four scenarios were studied: (1) a current WWTP operated at an SRT of 15 d, without a sludge ozonation system; (2) a WWTP operated at an SRT of 15 d, with a sludge-ozonation system that would achieve zero sludge production; (3) a WWTP operated at an SRT of 3 d, with a sludge-ozonation system that would provide the same sludge production as scenario 1; (4) a WWTP operated at an SRT of 15 d, with a sludge-ozonation system that would achieve zero sludge production. Economic analysis shows that the treatment costs for scenarios 1 and 2 are similar, while a reduction in cost of up to 47% is obtained for scenarios 3 and 4
PB MDPI
YR 2022
FD 2022
LK http://hdl.handle.net/10347/27635
UL http://hdl.handle.net/10347/27635
LA eng
NO Sustainability 2022, 14, 2480. https://doi.org/10.3390/su14052480
NO This research was funded by the Chilean Government through the Projects ANID/FONDECYT/1200850 and CRHIAM Centre grant number ANID/FONDAP/15130015, by the Spanish Government through TREASURE [CTQ2017-83225-C2-1-R] and by the European Commission LIFE ZERO WASTE WATER [LIFE19ENV/ES/000631] projects. The authors from Universidade de Santiago de Compostela belong to CRETUS Strategic Partnership [ED431E 2018/01] and the Galician Competitive Research Group [GRC ED431C-2021/37]. All the Spanish programs are co-funded by FEDER (EU)
DS Minerva
RD 24 abr 2026