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In pilot plant studies, permeates of ultrafiltration of boron- and ethanolamine-containing coolants were used as a carbon source for denitrification of NO 2 -N and NO 3 -N in the wastewater from electrochemical deburring after metal ion precipitation. Treatment of the two wastewater streams in a cascade of submerged fixed bed reactors at increasing pH-values revealed that a more alkaline...
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