Abstract
Total oxygen deficit occurred regularly during stagnation periods in the deepest part of Lake Kallavesi in the period 1973–1986. The sediment was black and anaerobic during the first sampling in 1987. After beginning of artificial lake oxygenation and efficient purification of waste waters of a paper board mill in 1986 the oxygen deficit decreased gradually and a light brown oxidized uppermost sediment layer appeared and began to thicken. The following changes in the sediment composition were observed during 1987–1996: loss on ignition, total nitrogen and BOD7 concentrations decreased in the uppermost sediment layer (0–2 cm) and BOD7 concentration increased in the next sediment layer beneath (2–10 cm). There were no significant change in phosphorus and iron concentrations.
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