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Area for effort: Mercury Responsible: Municipality of Herning
Problem
Total mercury consumption can be divided into intentional and unintentional use. The intentional use from 1992-93 to 2001 has been reduced by 70 % from around 6,200 kg/year to around 1,600 kg/year. The unintentional use remains at around 2,000 kg/year. /1/
Mercury in amalgam for dental fillings accounts for by far the largest part of the present intentional use – around 75%. /1/. Discharges from wastewater treatment plants are the largest source of mercury in the aquatic environment and in soil due to application of sludge. The treatment plants receive mercury primarily from dental clinics, but other major sources are thermometers and measuring and control equipment.
Target group
Enterprises and the municipality, i.e. private dental clinics and the municipal dental treatment for schoolchildren.
Instrument/effort: Visits and guidance/dialogue
Limitation of discharges of mercury from dentists through correct waste management and treatment of wastewater. In addition, studies of knowledge about alternatives to the use of mercury.
Supervision of dental clinics, guidance on management of mercury, requirements for treatment of mercury-containing wastewater and requirement for management of waste with mercury.
Indicators
Number of visits to clinics
Number of clinics with wastewater filter for treatment of wastewater
Number of clinics with correct waste management
Concentration of mercury in wastewater at intake to Herning wastewater treatment plant
When
September 2005 – December 2006.
How
Environmental supervision, connection permits, waste management, wastewater analyses.
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