Nitrification and Heavy Metal Removal in the Activated Sludge Treatment Process.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
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A bench-scale, continuous flow, completely mixed activated sludge system was used to investigate the relationship of nitrification and other system parameters to heavy metal removal in the activated sludge waste treatment process. The heavy metals studied were chromium and silver. Analyses performed on the influent, mixed liquor, return sludge, and effluent included heavy metal concentration, pH, dissolved oxygen, temperature, suspended solids, chemical oxygen demand, nitrogen species, alkalinity, and other system control parameters. Results indicate that the sludge wasting rate is directly related to heavy metal removal. Nitrification is only indirectly related. A theory for the mechanisms contributing to heavy metal removal is developed.
- Water Pollution and Control