Fate of leaf litter deposits and impacts on oxygen availability in bank filtration column studies.
Environ Res
; 164: 495-500, 2018 07.
Article
em En
| MEDLINE
| ID: mdl-29602093
ABSTRACT
Degradation of particulate organic carbon (POC) such as leaf litter might deplete dissolved oxygen within the upper layers of bank filtration, an efficient and robust barrier for pathogens and for various organic micro-pollutants (OMP) in water supply systems worldwide. The degradation of OMP during bank filtration depends on the redox conditions. The present study aimed at identifying the impacts and fates of different local leaves on the oxygen consumption and the possible biological degradation of indicator OMP. Oxygen concentrations initially decreased within the columns from around 8â¯mg/L in the influent to low concentrations indicating extensive consumption within a short travel distance. Still a substantial oxygen consumption was observed after 250 days. OMP concentrations were not significantly affected by the microbial processes. A layer of calcium carbonate crystallites was observed on the POC layer. Some leaf fragments appeared to be persistant towards degradation and the carbon content relative to nitrogen and sulfur contents decreased within 250 days. The results demonstrate that trees at bank filtration sites might have a strong long-term impact on the subsurface redox conditions.
Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Oxigênio
/
Poluentes Químicos da Água
/
Folhas de Planta
Idioma:
En
Revista:
Environ Res
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Alemanha