Stensund wastewater aquaculture: Studies of key factors for its optimization

This paper is a summary of an in-depth study of key factors in the function of a 7-year-old aquaculture system designed for treatment and recycling of domestic wastewater at Stensund, Trosa, Sweden. The reported areas are: wa stewater flows, reduction of biochemical oxygen demand (BOD), chemical oxyg en demand (COD), phosphorus, nitrogen, and fecal bacteria. Plant production is recorded as harvested biomass, and energy results are given as generate d heat and electricity consumption. Special studies were conducted on the r eduction of copper by anaerobic treatment. Nitrification was studied with d ifferent filter media. Microalgal autofocculation of phosphorus was studied in relation to pH and water hardness for the green algal genus Scenedesmus . Limiting factors for the growth of Daphnia magna in the zooplankton step of the constructed aquatic food-web was studied in a specially designed rep roduction test. The results are analyzed in order to optimize the function of the wastewater aquaculture. (C) 1998 Elsevier Science B.V. All rights re served.