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Article

Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity

1
Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
2
Interdepartmental Centre for Water Research, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
3
Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
4
Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, 25123 Brescia, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Xanel Vecino
Water 2021, 13(13), 1754; https://doi.org/10.3390/w13131754
Received: 30 April 2021 / Revised: 20 June 2021 / Accepted: 22 June 2021 / Published: 25 June 2021
To date, the management of high-strength wastewater represents a serious problem. This work aims to evaluate the performance on chemical pollutants and on sludge production of one of the two full-scale thermophilic membrane bioreactors (ThMBRs) currently operational in Italy, based on monitoring data of the last two and a half years. Removal yields on COD, N-NOx, non-ionic and anionic surfactants (TAS and MBAS), increased with the input load up to 81.9%, 97.6%, 94.7%, and 98.4%, respectively. In the period of stability, a very low value of sludge production (0.052 kgVS kgCOD−1) was observed. Oxygen uptake rate (OUR) tests allowed us to exclude the possibility that mesophilic biomass generally exhibited any acute inhibition following contact with the aqueous residues (ARs), except for substrates that presented high concentrations of perfluoro alkyl substances (PFAS), cyanides and chlorides. In one case, nitrifying activity was partially inhibited by high chlorides and PFAS concentration, while in another the substrate determined a positive effect, stimulating the phenomenon of nitrification. Nitrogen uptake rate (NUR) tests highlighted the feasibility of reusing the organic carbon contained in the substrate as a source in denitrification, obtaining a value comparable with that obtained using the reference solution with methanol. Therefore, respirometric tests proved to be a valid tool to assess the acute effect of AR of ThMBR on the activity of mesophilic biomass in the case of recirculation. View Full-Text
Keywords: thermophilic; wastewater; surfactants; denitrification; sludge production; biological activity; nitrogen uptake rate thermophilic; wastewater; surfactants; denitrification; sludge production; biological activity; nitrogen uptake rate
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MDPI and ACS Style

Collivignarelli, M.C.; Carnevale Miino, M.; Caccamo, F.M.; Baldi, M.; Abbà, A. Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity. Water 2021, 13, 1754. https://doi.org/10.3390/w13131754

AMA Style

Collivignarelli MC, Carnevale Miino M, Caccamo FM, Baldi M, Abbà A. Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity. Water. 2021; 13(13):1754. https://doi.org/10.3390/w13131754

Chicago/Turabian Style

Collivignarelli, Maria C., Marco Carnevale Miino, Francesca M. Caccamo, Marco Baldi, and Alessandro Abbà. 2021. "Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity" Water 13, no. 13: 1754. https://doi.org/10.3390/w13131754

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