Changes in Lake Norrviken after sewage diversion

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Abstract
Summary In 1969 all sewage effluents were diverted from Lake Norrviken. In the two years following this diversion slight improvements of the water quality have been registered. The total N concentration has decreased from 5–6 to 2–3 mg/1, and there is evidence that N was a limiting factor for phytoplankton growth in 1970. P concentration has decreased very slowly from 300–400 to 200–300 μg/1. Phytoplankton biomass was mum smaller in 1970 than previous years, but the primary production was larger than that measured in 1961/62. Sedimentation of P in 1970 was estimated to be 3.1 g/m2 and the release of P from the sediments 2.7 g/m2. This means that sedimentation and release of P approximately counterbalance eam other, and further recovery of the lake is not to be expected unless the P concentration in the main tributary of the lake decreases to mum lower values than it has today.

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