On Monday 4 April 2011 the Minister for the Environment, Karen Ellemann, was invited by Danish Agriculture Mid-East Jutland (DLMO) to open a new constructed wetland by Rodsteneje Manor south of Odder. On the same occasion phase 1 of the SupremeTech drain filter wells were opened.
The 1 ha of constructed wetland was established in the autumn of 2010 in an area by Rodsteneje Manor with the objective of removing nutrients from a 110 ha large catchment area. The surface-flow constructed wetland was finished with inlet and outlet wells in March 2011 and has been established with three reservoirs with a water depth of 1-2 meter and two traversing borders with a water depth of ca. 30 cm.
During the spring of 2011 wetlands plants will be established. This vegetation is crucial to the introduction of carbon for the denitrification processes – the transformation of nitrate to free nitrogen. Not until after the summer of 2011, the establishing of wetlands plants will be so advanced that the wetland will be functional in relation to removal of nitrogen. From the autumn of 2011 SupremeTech will monitor the effect of the constructed wetland, which is why flow measurers as well as ISCO gatherers will be installed in the inlet as well as the outlet in order to keep track of amounts of water and concentration of nutrients to and from the area.
Within the framework of SupremeTech and adjacent to the constructed wetland in connection with the same drain system a row of test wells has been established with the intention of researching the possibilities of removing nutrients in so called “drain filter wells”. Apart from 3 smaller wells with room for measuring equipment, two primary wells have been constructed. “Well 1” contains a particle filter to remove particles and suspended sediment from the drain water, and “Well 2” contains a reactive filter module to remove dissolved nutrients. The testing of the particle filter will begin now and during the autumn of 2011 further tests of the reactive filter module will be tested under field conditions. At the moment work is being carried out on porous filter matrixes in the laboratory with the objective of optimising the filter hydraulics and the retaining of nutrients.
The drain filter wells are developed within the SupremeTech framework with professional and financial support from IBF, Orbicon and KWH-pipe. In this constructed wetland project Danish Agriculture Mid-East Jutland (DLMO) is project leader and the Knowledge Centre for Agriculture is in charge of project coordination with Aarhus University affiliated during the design phase. It has been financed by Rural District Development funds with contributions from the municipalities of Odder and Aarhus as well as by DLMO.