Construction site visit by the United Nations

Construction site visit by the United Nations

Construction site visits by the United Nations Site remediation in Switzerland often takes place in the smallest spaces in residential areas. Experts from Nigeria looked at an example of such decontamination work in the middle of June 2019 during training in Switzerland, which was organised by the United Nations Environment Programme (UNEP).

A white tent sits enthroned in the middle between homes and the railway line above the excavation pit. This removes chlorinated hydrocarbons (CHCs), which had found their way into the soil as a result of many years of chemical purification. The participants were shown the challenges to be overcome during a one-hour guided tour. Except in their pure phase, CHCs are not visible, volatile and identifiable at high concentrations of intense chemical odour. The tent was equipped with efficient ventilation in order to protect the inhabitants of the surrounding buildings from emissions and its outgoing air was purified on site by means of activated carbon. In addition to the time-consuming securing of the excavation pit and ventilation, protective clothing, respiratory masks and protective goggles also ensured the occupational safety of the people in the tent. We hope visitors to the construction site were able to benefit from the visit and take home valuable information and suggestions.