Abstract
Long-term BOD determinations have been carried out on kraft pulp mill effluent over a period of more than 200 days using the conventional dilution method and utilizing a special bottle sealing technique. Determinations were made at the temperatures 2, 5, 10 and 20°C on untreated effluent and on effluent treated by an experimental biological extended aeration treatment plant which treated effluent discharged to Lake Saimaa in eastern Finland. BOD curves have been constructed for up to a period of 200 days and the results indicate that untreated effluent exerts a two-stage BOD on receiving waters, the second stage commencing after approx. 28 days. Treated effluent was found to have a low BOD and showed no second stage of oxygen uptake.
Published Version
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