Levels of volatile methylsiloxanes in urban wastewater sludges at various steps of treatment

• Tipo: Artigo em Revista Científica Internacional
• Data: 2021

Autores

Joana Silva (Autor) Outra; Fábio Bernardo (Autor) FEUP; Mónica Jesus (Autor) Outra; Tiago Faria (Autor) Outra; Arminda Alves (Autor) FEUP; Vera Homem (Autor) FEUP; Nuno Ratola (Autor) FEUP

Revista

Título: Environmental Chemistry Letters

Páginas: 2723-2732

ISSN: 1610-3653

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Projetos Associados

LaNSiloT - LAunching New SILOxane Treatments: assessing effluent, sludge and air quality and improving biogas production in WWTPs

AGRONAUT - Estudo do impacto agronómico da utilização de lamas de depuração através de uma perspectiva de exposição

LEPABE - Financiamento Plurianual 2020-2023 da Unidade de I&D LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Outras Informações

ID Authenticus: P-00T-GGB

DOI: 10.1007/s10311-021-01191-1

Abstract (EN): Volatile methylsiloxanes are wastewater organic pollutants originating from industrial and personal care products. They accumulate in sewage sludge and hamper biogas production through the formation of silicon dioxide on the surfaces of gas engines and turbines, yet there is few knowledge on their fate in sludge treatment systems. Here we studied the occurrence and removal of seven volatile methylsiloxanes along the solid treatment line of an urban wastewater treatment plant. We analyzed 75 sludge samples from seven locations using ultrasound-assisted solid-liquid extraction followed by gas chromatography-mass spectrometry. Results show that volatile methylsiloxanes occur in all samples with a predominance of cyclic homologues, particularly decamethylcyclopentasiloxane. Total siloxane levels reach 6087 ng/g dry weight in the secondary sludge, average at 3575 ng/g in digested sludge, and 5703 ng/g in the dewatered sludge, the latter being likely due to the addition of a polyelectrolyte. Overall, these levels call for measures to reduce methylsiloxane levels before the biogas production step.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10