Irrigating Wastewater using RWIS for Treating in Soil-Plant System

Dahn Rosenqvist

doi:10.15626/Eco-Tech.1999.001

Authors

Dahn Rosenqvist Rosenqvist Mekaniska Verkstad AB, Sweden

DOI:

https://doi.org/10.15626/Eco-Tech.1999.001

Abstract

In Sweden, large areas of willow plantations designated for energy purposes have been established. Pilot tests, using various waste products from society for fertilisation and/or irrigating purposes, have been carried out at Kagerods wastewater plant since 1992. These tests have clearly shown that recycling of municipal wastewater in Salix plantations, can replace a large part of the conventional wastewater treatment, due to natural purification processes in the soil/plant system. During the last few years, several full-scale treatment plants based on the soil/plant system have been set up. Rosenqvist Mek.Verkstad has developed the irrigation system "RWIS" for distribution of wastewater into the plantation. The system uses a controlled flooding technique, combined with computer operation controlled electric valves placed in the fields. By measuring the flow and having knowledge about the contents of the wastewater, it is possible to have total control over the wastewater that is distributed in a specific area. The irrigation system has to be able to withstand trying conditions, without major maintenance in between harvests.

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