Journal
WATER ENVIRONMENT RESEARCH
Volume 77, Issue 4, Pages 425-428Publisher
WATER ENVIRONMENT FEDERATION
DOI: 10.2175/106143005X52175
Keywords
hexavalent chromium; chromate reduction; biological treatment; biofilm process; suspended carriers; packed bed
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When ferrochromium is produced at Vargon Alloys AB (Vargon, Sweden), an offgas dust is generated as a byproduct. A leachate that contains hexavalent chromium (Cr(6+)) is formed when rainwater percolates through the dust deposit. In this study, Cr(6+) in the leachate was reduced to trivalent chromium (Cr(3+)) by biological treatment in a biofilm process operated under anaerobic conditions. The reactor volume was 26 m(3) and it was filled with 16 m(3) plastic packing. Acetic acid was added as an electron donor. The Cr(6+) Was reduced from 10 to 20 mg/L to below 0.03 mg/L when the reactor was operated at a hydraulic retention time of 11 hours. The reduction activity in the process gradually decreased as the water temperature dropped below 10 degrees C.
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