Simultaneous disinfection and microcontaminants elimination of urban wastewater secondary effluent by solar advanced oxidation sequential treatment at pilot scale

Gulnara Maniakova; María Inmaculada Polo-López; Isabel Oller; María Jesús Abeledo-Lameiro; Sixto Malato; Luigi Rizzo

doi:10.1016/j.jhazmat.2022.129134

Simultaneous disinfection and microcontaminants elimination of urban wastewater secondary effluent by solar advanced oxidation sequential treatment at pilot scale

J Hazard Mater. 2022 Aug 15:436:129134. doi: 10.1016/j.jhazmat.2022.129134. Epub 2022 May 11.

Authors

Gulnara Maniakova¹, María Inmaculada Polo-López², Isabel Oller², María Jesús Abeledo-Lameiro², Sixto Malato³, Luigi Rizzo⁴

Affiliations

¹ Water Science and Technology (WaSTe) group, Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy.
² CIEMAT-Plataforma Solar de Almería, Ctra. Senés km 4, 04200 Almería, Spain; Solar EnergyResearch Centre (CIESOL), Joint Centre University of Almería-CIEMAT, Carretera de Sacramento s/n, E-04120, Almería, Spain.
³ CIEMAT-Plataforma Solar de Almería, Ctra. Senés km 4, 04200 Almería, Spain; Solar EnergyResearch Centre (CIESOL), Joint Centre University of Almería-CIEMAT, Carretera de Sacramento s/n, E-04120, Almería, Spain. Electronic address: smalato@psa.es.
⁴ Water Science and Technology (WaSTe) group, Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy. Electronic address: l.rizzo@unisa.it.

PMID: 35580500
DOI: 10.1016/j.jhazmat.2022.129134

Abstract

The effect of different times of Fe:Ethylenediamine-N, N'-disuccinic acid (EDDS) dosing and H₂O₂ as well as different Fe:EDDS concentrations in the sequential treatment sunlight/H₂O₂ followed by sunlight/H₂O_2/Fe:EDDS at circumneutral pH was investigated for the first time focusing both in contaminants of emerging concern (CECs) and bacteria removal in urban wastewater treatment plant effluents. Process efficiency was evaluated in terms of (i) degradation of five CECs (namely caffeine, carbamazepine, diclofenac, sulfamethoxazole and trimethoprim) at the initial concentration of 100 μgL^-1 each and (ii) bacteria inactivation (Escherichia coli (E. coli) and Salmonella spp). The effect of H₂O₂, Fe and EDDS concentration and Fe:EDDS dosing time was evaluated. 60% removal of the sum of total CECs and pathogens inactivation below the detection limit (DL) were observed by the sequential treatment with Fe:EDDS additions at 60 min and 45 min in simulated urban wastewater effluent. Sequential treatment was validated in actual urban wastewater effluent, being able to remove 60% of the target CECs and inactivate bacteria below the DL. Increasing EDDS concentration negatively affected Salmonella spp inactivation. Sequential treatment based on 120 min of sunlight/H₂O₂ (50 mg L^-1) and subsequent SPF with Fe:EDDS (0.1:0.1 mM) was chosen as best operation conditions for full scale treatment in urban wastewater treatment plants.

Keywords: Advanced oxidation processes; Contaminants of emerging concern; Escherichia coli; Salmonella spp; Wastewater reuse.

Publication types

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

MeSH terms

Disinfection
Escherichia coli
Hydrogen Peroxide / chemistry
Oxidation-Reduction
Sunlight
Wastewater* / chemistry
Water Pollutants, Chemical* / analysis

Substances

Waste Water
Water Pollutants, Chemical
Hydrogen Peroxide