THE USE OF FERRIC SALTS FOR CONTROLLING SULFIDE ODORS IN HIGH-STRENGTH PULP AND PAPER MANUFACTURING WASTES

摘要

Iron salts are effective in controlling sulfide odors produced by sludge blanket samples of a facultative waste treatment lagoon receiving concentrated sulfite waste from a pulp and paper manufacturing facility. Complex interactions between dissolve iron species and reduced sulfides interfere with predictions of effective chemical dosing, requiring site/season-specific dose determinations. For example, samples collected during periods of warmer water, when metabolic rates are higher in the sludge blanket, require higher dosages of ferric chloride for odor control. A technique is presented that uses jar tests to determine effective dosage rates of iron salts to produce a desired odor-free period in a particular waste. Potentially, large volumes of sludge may be generated through the possible precipitation of metal-sulfide complexes. Iron-rich waste products may provide a cost effective source of ferric iron for these applications.