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Catchment-wide validated assessment of combined sewer overflows (CSOs) in a mediterranean coastal area and possible disinfection methods to mitigate microbial contamination.
Environ Res. 2021 05; 196:110367.ER

Abstract

The first phase of this study aimed to evaluate the environmental impact of combined sewer overflow (CSO) events originated from 35 spillways on the Rio Vallescura catchment (Central Italy) and to understand their contribution to the deterioration of the coastal bathing water quality. A specific analytical campaign was carried out in the sewer system and a dynamic rainfall-runoff simulation model was developed and integrated with a water quality model and further validated. The simulations led to identify the most critical spills in terms of flow rate and selected pollutant loads (i.e. suspended solids, biochemical oxygen demand, chemical oxygen demand, total Kjeldahl nitrogen, Escherichia coli). Specifically, the E. coli release in the water body due to CSO events represented almost 100% of the different pollutant sources considered. In the second phase, the applicability of various disinfection methods was investigated on the CSOs introduced into the catchment. On site physical (UV) and lab-scale chemical (peracetic acid (PAA), performic acid (PFA), ozone) disinfectant agents were tested on microbial indicators including E. coli and intestinal enterococci. PFA and ozone were more effective on the removal of both bacteria (above 3.5 log units) even at low concentration and with short contact time; whereas, PAA showed a moderate removal efficiency (around 2.5 log units) only for E. coli. The highest removal efficiency was achieved in the on-site UV unit and none of the indicator bacteria was detected in the final effluent after the sand filtration and UV treatment. Finally, potential scenarios were developed in comparison to the baseline scenario for the management and treatment of CSOs where a mitigation of E. coli loads from 28% to 73% was achieved on the receiving water body, and a comparative cost assessment of the disinfection methods was provided for in situ treatment of the most critical spillway.

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Authors+Show Affiliations

Crocetti P
Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Marche Polytechnic University, 60131, Ancona, Italy.
Eusebi AL
Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Marche Polytechnic University, 60131, Ancona, Italy. Electronic address: a.l.eusebi@staff.univpm.it.
Bruni C
Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Marche Polytechnic University, 60131, Ancona, Italy.
Marinelli E
Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Marche Polytechnic University, 60131, Ancona, Italy.
Darvini G
Department of Civil and Building Engineering and Architecture, Marche Polytechnic University, 60131, Ancona, Italy.
Carini CB
CIIP SpA - Cicli Integrati Impianti Primari - Water Utility, Viale Della Repubblica, 24, 63100, Ascoli Piceno, Italy.
Bollettini C
CIIP SpA - Cicli Integrati Impianti Primari - Water Utility, Viale Della Repubblica, 24, 63100, Ascoli Piceno, Italy.
Recanati V
CIIP SpA - Cicli Integrati Impianti Primari - Water Utility, Viale Della Repubblica, 24, 63100, Ascoli Piceno, Italy.
Akyol Ç
Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Marche Polytechnic University, 60131, Ancona, Italy. Electronic address: c.akyol@staff.univpm.it.
Fatone F
Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Marche Polytechnic University, 60131, Ancona, Italy.

MeSH

DisinfectantsDisinfectionEscherichia coliItalySewageWater Quality

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

33131711

Citation

Crocetti, Paolo, et al. "Catchment-wide Validated Assessment of Combined Sewer Overflows (CSOs) in a Mediterranean Coastal Area and Possible Disinfection Methods to Mitigate Microbial Contamination." Environmental Research, vol. 196, 2021, p. 110367.
Crocetti P, Eusebi AL, Bruni C, et al. Catchment-wide validated assessment of combined sewer overflows (CSOs) in a mediterranean coastal area and possible disinfection methods to mitigate microbial contamination. Environ Res. 2021;196:110367.
Crocetti, P., Eusebi, A. L., Bruni, C., Marinelli, E., Darvini, G., Carini, C. B., Bollettini, C., Recanati, V., Akyol, Ç., & Fatone, F. (2021). Catchment-wide validated assessment of combined sewer overflows (CSOs) in a mediterranean coastal area and possible disinfection methods to mitigate microbial contamination. Environmental Research, 196, 110367. https://doi.org/10.1016/j.envres.2020.110367
Crocetti P, et al. Catchment-wide Validated Assessment of Combined Sewer Overflows (CSOs) in a Mediterranean Coastal Area and Possible Disinfection Methods to Mitigate Microbial Contamination. Environ Res. 2021;196:110367. PubMed PMID: 33131711.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Catchment-wide validated assessment of combined sewer overflows (CSOs) in a mediterranean coastal area and possible disinfection methods to mitigate microbial contamination. AU - Crocetti,Paolo, AU - Eusebi,Anna Laura, AU - Bruni,Cecilia, AU - Marinelli,Enrico, AU - Darvini,Giovanna, AU - Carini,Claudio Bernardo, AU - Bollettini,Cristiana, AU - Recanati,Virginia, AU - Akyol,Çağrı, AU - Fatone,Francesco, Y1 - 2020/10/22/ PY - 2020/06/08/received PY - 2020/08/25/revised PY - 2020/10/19/accepted PY - 2020/11/3/pubmed PY - 2021/6/4/medline PY - 2020/11/2/entrez KW - Bathing water quality KW - Combined sewer overflow KW - Disinfection KW - Escherichia coli KW - Microbial contamination KW - Modelling SP - 110367 EP - 110367 JF - Environmental research JO - Environ Res VL - 196 N2 - The first phase of this study aimed to evaluate the environmental impact of combined sewer overflow (CSO) events originated from 35 spillways on the Rio Vallescura catchment (Central Italy) and to understand their contribution to the deterioration of the coastal bathing water quality. A specific analytical campaign was carried out in the sewer system and a dynamic rainfall-runoff simulation model was developed and integrated with a water quality model and further validated. The simulations led to identify the most critical spills in terms of flow rate and selected pollutant loads (i.e. suspended solids, biochemical oxygen demand, chemical oxygen demand, total Kjeldahl nitrogen, Escherichia coli). Specifically, the E. coli release in the water body due to CSO events represented almost 100% of the different pollutant sources considered. In the second phase, the applicability of various disinfection methods was investigated on the CSOs introduced into the catchment. On site physical (UV) and lab-scale chemical (peracetic acid (PAA), performic acid (PFA), ozone) disinfectant agents were tested on microbial indicators including E. coli and intestinal enterococci. PFA and ozone were more effective on the removal of both bacteria (above 3.5 log units) even at low concentration and with short contact time; whereas, PAA showed a moderate removal efficiency (around 2.5 log units) only for E. coli. The highest removal efficiency was achieved in the on-site UV unit and none of the indicator bacteria was detected in the final effluent after the sand filtration and UV treatment. Finally, potential scenarios were developed in comparison to the baseline scenario for the management and treatment of CSOs where a mitigation of E. coli loads from 28% to 73% was achieved on the receiving water body, and a comparative cost assessment of the disinfection methods was provided for in situ treatment of the most critical spillway. SN - 1096-0953 UR - https://www.unboundmedicine.com/medline/citation/33131711/Catchment_wide_validated_assessment_of_combined_sewer_overflows__CSOs__in_a_mediterranean_coastal_area_and_possible_disinfection_methods_to_mitigate_microbial_contamination_ DB - PRIME DP - Unbound Medicine ER -