See Photo report
20160080_0069
© Cyril FRESILLON/ISTO/CNRS Photothèque

Sampling a sediment column in a core sample taken from a sand filter

Reference

20160080_0069

Production year

2016

Max. size

27.77 x 41.72 cm / 300 dpi

Légende

Sampling a sediment column in a core sample taken from a sand filter. Each year this water purification device located under the Quai de la Madeleine in Orléans filters some 7 million cubic metres of wastewater and rainwater from the north of the city which is subsequently channelled to treatment plants downstream. The conical basin is 17 m deep and is entirely buried underground. The sediment accumulated since the construction of the basin in 1942 will help researchers reconstitute more than 70 years of local history. The renovation of the sand filter was the perfect opportunity to take core samples of the sediment and examine its content. The diversity and the changes in the markers observed over time open up new perspectives on the chronology of events across the catchment area, with the focus on issues of major concern such as public health, pollution, biodiversity, transportation and the power supply.

CNRS Institute(s)

Scientific topics

From the same photo report: Core drilling in a sewage system in Orléans

CNRS Images,

Our work is guided by the way scientists question the world around them and we translate their research into images to help people to understand the world better and to awaken their curiosity and wonderment.