Cadmium level of metro sludge steadily decreases
According to a preliminary review of 1988 cadmium levels, sludge from Seattle Metro's West Point and Renton treatment plants averaged under 25 ppm per year. Data will be officially analyzed and published this spring. The sludge Metro recycles as fertilizer is high-quality for all metals. Federal guidelines require cadmium levels in sludge to be below 25 ppm for sludge to be applied to food-chain crops. As a policy, Metro does not apply the sludge to food chain crops. Instead, the agency recycles its sludge in forestry, soil improvement and composting projects. The metal reduction is attributed to a municipal control project to reduce corrosion of water pipes and to Metro's industrial waste pretreatment program.
- OSTI ID:
- 6952915
- Journal Information:
- BioCycle; (USA), Vol. 30:4; ISSN 0276-5055
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CADMIUM
ECOLOGICAL CONCENTRATION
SEWAGE SLUDGE
RECYCLING
FORESTRY
INDUSTRIAL WASTES
LAND POLLUTION
MUNICIPAL WASTES
SOILS
WASHINGTON
WASTE DISPOSAL
ELEMENTS
FEDERAL REGION X
MANAGEMENT
METALS
NORTH AMERICA
POLLUTION
SEWAGE
SLUDGES
USA
WASTE MANAGEMENT
WASTES
320604* - Energy Conservation
Consumption
& Utilization- Municipalities & Community Systems- Municipal Waste Management- (1980-)
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
540220 - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)