Details

Autor(en) / Beteiligte

• Sá, Mariana F.T.
• Castro, Verónica
• Gomes, Ana I.
• Morais, Daniela F.S.
• Silva Braga, Rui V.P.S.
• Saraiva, Isabel
• Souza-Chaves, Bianca M.
• Park, Minkyu
• Fernández-Fernández, Victoria
• Rodil, Rosario
• Montes, Rosa
• Quintana, José Benito
• Vilar, Vítor J.P.

Titel

Tracking pollutants in a municipal sewage network impairing the operation of a wastewater treatment plant

Ist Teil von

• The Science of the total environment, 2022-04, Vol.817, p.152518-152518, Article 152518

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2022

Quelle

MEDLINE

Beschreibungen/Notizen

• This work provides a screening of organic contaminants and characterization of the dissolved organic matter in the sewer network until the municipal wastewater treatment plant (WWTP), identifying the network areas with a higher degree of contamination and their impact on the WWTP performance, particularly in the activated sludge reactor. Three monitoring campaigns were carried out at six selected locations of the sewage system (PVZ-1, PVZ-2, PS-F, PS-VC, CP-VC, and PS-T), influent (WWTPINF) and effluent (WWTPEFF) of the WWTP. Advanced analytical techniques were employed, namely excitation/emission matrix fluorescence-parallel factor analysis (EEM-PARAFAC), size exclusion chromatography with organic carbon detector (SEC-OCD), and liquid chromatography with high-resolution-mass spectrometric detection (LC-HRMS). EEM-PARAFAC showed higher fluorescence intensity for the protein-like component (C2), particularly at CP-VC (near seafood industries) associated with the presence of surfactants (~50 mg/L). SEC-OCD highlighted the WWTP efficiency in removing low molecular weight acids and neutrals. LC-HRMS tentatively identified 108 compounds of emerging concern (CEC) and similar detection patterns were obtained for all wastewater samples, except for PVZ-2 (lower detection), many of which occurred in the effluent. Eight CECs included on relevant Watch-Lists were detected in all WWTPEFF samples. Furthermore, 111 surfactants were detected, the classes more frequently found being alcohol ethoxylates (AEOs), nonylphenol polyethoxylates (NPEOs) and linear alkylbenzene sulphonates (LAS). The continuous presence of LAS and NPEOs allied to surfactants concentrations in the WWTPINF of 15–20 mg/L, with CP-VC location (linked with food industries) as an important contributor, explain the morphological changes in the activated sludge and high LAS content in the dewatered sludge, which may have impacted WWTP performance. [Display omitted] •Sewer network monitoring identified several organic pollutants.•111 surfactants from 10 families tentatively identified by LC-HRMS in the sewer network.•Foam/biomass changes are associated with the presence of LAS/NPEOs in the WWTPINF.•WWTP performance impairment was tentatively associated to a food industrial area.•Several CECs and HMW DOM components detected in the WWTPEFF.