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Steel Slag Filtration for Extensive Treatment of Mining Wastewater

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The capacity of a slag filter for extensive combined treatment of phosphorus, fluoride and metals in a mining wastewater was assessed. Ten slags and one apatite were tested in short-term individual batch tests to compare their treatment efficiencies. Two slags were chosen for their high pH rise capacity (EAF slag from Forth Smith) and high fluoride treatment capacity (EAF slag from Blytheville). Three treatment sequences containing one or two different slags were tested in short-term sequential batch tests to compare their treatment efficiencies. The same three sequences were tested in long-term column tests (43 to 95 days) fed with two reconstituted mining wastewaters operated at 32 hours total hydraulic retention time. All the sequences achieved high removal efficiency for all the contaminants. EAF slag from Blytheville was more efficient for fluoride removal than EAF slag from Forth Smith, but its longevity was shorter. Fluoride removal was possible only if phosphorus was present in the inlet water.

Keywords: fluoride; metals; mining wastewater; phosphorus; steel slag

Document Type: Research Article


Publication date: 2011-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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