Long-term evolution of highly alkaline steel slag drainage waters

The disposal of slag generated by the steel industry can have negative consequences upon the surrounding aquatic environment by the generation of high pH waters, leaching of potentially problematic trace metals, and rapid rates of calcite precipitation which smother benthic habitats. A 36-year datas...

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Published in:Environmental monitoring and assessment 2015-07, Vol.187 (7), p.463-463, Article 463
Main Authors: Riley, Alex L., Mayes, William M.
Format: Article
Language:English
Subjects:
Alkalinity
Aluminum
Aquatic environment
Atmospheric Protection/Air Quality Control/Air Pollution
Calcite
Calcium
Calcium Carbonate - analysis
Chemical precipitation
Drainage
Earth and Environmental Science
Ecology
Ecotoxicology
England
Environment
Environmental Management
Environmental Monitoring
Heavy metals
Industrial Waste - analysis
Invertebrates
Leachates
Leaching
Metals - analysis
Molybdenum
Monitoring/Environmental Analysis
pH effects
Physicochemical properties
Pollution
Slag
Steel
Steel industry
Steel production
Streams
Time Factors
Trace metals
Trends
Water Pollutants, Chemical - analysis
Water quality
Watercourses
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description The disposal of slag generated by the steel industry can have negative consequences upon the surrounding aquatic environment by the generation of high pH waters, leaching of potentially problematic trace metals, and rapid rates of calcite precipitation which smother benthic habitats. A 36-year dataset was collated from the long-term ambient monitoring of physicochemical parameters and elemental concentrations of samples from two steel slag leachate-affected watercourses in northern England. Waters were typified by elevated pH (>10), high alkalinity, and were rich in dissolved metals (e.g. calcium (Ca), aluminium (Al), and zinc (Zn)). Long-term trend analysis was performed upon pH, alkalinity, and Ca concentration which, in addition to Ca flux calculations, were used to highlight the longevity of pollution arising as a result of the dumping and subsequent leaching of steel slags. Declines in calcium and alkalinity have been modest over the monitoring period and not accompanied by significant declines in water pH. If the monotonic trends of decline in alkalinity and calcium continue in the largest of the receiving streams, it will be in the region of 50–80 years before calcite precipitation would be expected to be close to baseline levels, where ecological impacts would be negligible.
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subjects Alkalinity
Aluminum
Aquatic environment
Atmospheric Protection/Air Quality Control/Air Pollution
Calcite
Calcium
Calcium Carbonate - analysis
Chemical precipitation
Drainage
Earth and Environmental Science
Ecology
Ecotoxicology
England
Environment
Environmental Management
Environmental Monitoring
Heavy metals
Industrial Waste - analysis
Invertebrates
Leachates
Leaching
Metals - analysis
Molybdenum
Monitoring/Environmental Analysis
pH effects
Physicochemical properties
Pollution
Slag
Steel
Steel industry
Steel production
Streams
Time Factors
Trace metals
Trends
Water Pollutants, Chemical - analysis
Water quality
Watercourses
title Long-term evolution of highly alkaline steel slag drainage waters
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