Technical Tours2018-11-14T18:33:23+00:00

Technical Tours

Seven field trips to explore unique natural wetlands and peatlands in the region as well as examples of constructed and restored wetlands will be held.

Lille Vildmose and Pindstrup Mosebrug A/S

(Limited to 50 people)
Bus Departs from Lake Auditorium at 8:00
Bus Returns to Lake Auditorium at 16:30

This tour will present Lille Vildmose, a protected Danish wetland wilderness with raised bogs, rewetted marshland and natural forests. The excursion will include a visit to Lille Vildmose Center and an introduction to the recent EU LIFE-project for bog restoration in the area. Site visits will be made to the Portland bog, a 900 ha restored bog formerly used for peat excavation, the newest observation tower, the restored lake Birkesø and an experimental site for spreading Sphagnum mosses.

While Lille Vildmose is developing into a marshland with lakes after many decades of drainage and peat extraction, part of the area is also today used for peat production. The excursion will highlight a guided tour to Pindstrup Mosebrug A/S, a manufacturer of horticultural substrates with a production facility in Kongerslev, close to Lille Vildmose.

Additional information about Lille Vildmose and Pindstrup Mosebrug A/S can be found at: www.pindstrup.com and https://lillevildmose.dk/en/

Constructed Wetlands, Bioreactors and Integrated Buffer Zones treating Agricultural Drainage Discharge

(Limited to 50 people)
Bus Departs Lake Auditorium at 8:00
Bus Returns to Lake Auditorium at 16:00

This tour will highlight different measures to mitigate nutrient discharge from agricultural drainage water.

First, we will visit Aarhus University’s test site at a local farmer housing six subsurface flow constructed wetlands/bioreactors. Each unit has the dimensions 10 x 10 x 1 m and three flow designs are tested: horizontal flow, vertical upflow and vertical downflow. Research is focused on ageing of the woodchips and side effects like sulfide production and re-oxidation of effluent water.

Nest stop will be at the village Fillerup close to Odder town, 28 km from Aarhus, where we will visit two facilities. Fillerup surface flow/open water constructed wetland with an area of 0.36 ha receiving tile drainage water from a 56 ha drainage upland and which features a special Danish design of open water constructed wetlands with alternating shallow and deep water zones.

In walking distance from the Fillerup wetland we will go to an integrated buffer zone – IBZ – located along the Odder stream. An IBZ intercepts tile drainage water, which was previously discharged directly to the stream. The IBZ consists of ditch/longitudinal pond receiving the cut tile drainage water and a narrow infiltration zone between the ditch and the stream.

Our final visit will take place 8 km from Fillerup, and again at a local farmer where Aarhus University has built a bioreactor combined with a pond for peak flow reduction in order to optimize the performance of the bioreactor.

Additional information for these three wetlands can be found at:  http://supremetech.dk/  and http://idraen.dk/

Photo of the six bioreactors (left) and conceptual diagram of the three designs (Right)

Aerial photo of the open water constructed wetland (left) with 1) sedimentation pond 2) shallow water zone 3) deep water zone and conceptual diagram (right)

Photo of IBZ at the village Fillerup (left) and photo of an IBZ used for demonstration of the concept (right)

Photo of bioreactor combined with a pond for peak flow reduction (left) and a schematic drawing of the concept (right)

Wetland Restoration

Bus Departs Lake Auditorium at 8:00
Bus Returns to Lake Auditorium at 16:00

This tour will highlight several wetland and stream restoration projects in Denmark. The Årslev Engsø wetland project created/restored a 100 ha shallow lake surrounded by 110 ha of wetlands and was completed in 2003. The main objective of the project was to remove nitrogen and phosphorus from the downstream Brabrand Lake, to restore/create the biodiversity of the area and to create a recreational area close to Aarhus.

Wetland and stream restoration projects along the Simested and Little streams are traditional restoration projects where the stream is raised and re-meandered in order to reconnect the stream to the floodplain. Both projects were designed to remove nitrogen and phosphorus, but have greatly improved habitat for trout and biodiversity in the area. The Simested Stream restoration project involved restoring 41 ha of wetlands and re-meandering 400 m of Simested Stream and 300 m of Rorbæk Brook and was completed in 2016. The Little Stream restoration project involved restoring 215 ha of wetlands and re-meandering 11 km of Little Stream and was completed in 2015.

The Grynderup Lake restoration project involved restoring a 410 ha lake and associated wetlands and was completed in 2011. The restoration was the 3rd largest lake restoration in Danish history. The project involved removing 7 km of dikes/levies, filling over 25 km of ditches and drains, moving 75,000 m3 of dirt, removal of 3 pumps in order to restore a 130 ha lake and 280 ha of wetlands. After the initial construction, the project involved establishing 16 km of hiking trails, 2 km of handicap accessible trail, a pull ferry across the lake, 2 bird watching towers and a primitive camping area.

Biogas and Biorefinery R&D Facilities

(Limited to 50 people)
Bus Departs Lake Auditorium at 8:00
Bus Returns to Lake Auditorium at 16:00

This tour will visit the large biogas and biorefinery research and demonstration facilities at AU Foulum. These technologies are expected to help disrupt Danish agriculture from its current challenges of both fulfilling a number of environmental goals (EU Water Framework Directive, EU climate policy etc.) and of keeping its profitability. Grass, legumes and even dedicated wetland species can be produced with very low emissions, and is treated in the biorefinery for extraction of protein (feed or food), sugars, lignin and bioenergy. An adjacent meadow installed with piezometers and flow sensors in the field and drainage ditches  for detailed monitoring of water and nutrient flows will be visited. Different grass species tolerant to temporary flooding events have been established for biorefining and bioenergy and preliminary results will be presented.

Additional information about the biogas and biorefinery research and demonstration facilities can be found at http://cbio.au.dk/en/facilities/

Constructed Wetlands and Willow Evaporative System

(Limited to 50 people)
Bus Departs Lake Auditorium at 8:00
Bus Returns to Lake Auditorium at 17:00

Get inspired by visiting two different constructed wetland systems and a willow evaporative system. The first stop will be at a Bed & Breakfast in Bredsten, to see a modern 30 PE (24 m2) constructed wetland with forced aeration, which makes the system flexible regarding loads. Thereafter, we will go to Brørup, where a willow evaporative system for 12 households (35 PE) is installed. This system is unique, as it produces no effluent; all wastewater is evaporated.  We end the tour in Ørby where a 200 PE (90 m2) MET-system is cleaning wastewater produced by the entire village and holiday homes in the area (total 42 households). This system was constructed under the EU project H2020 iMETland where new technologies are tested in full scale. The tour will be guided by the Center for Recirculation and Kilian Water Ltd.

Vejlerne Nature Reserve

(Limited to 50 people)
Bus Departs Lake Auditorium at 8:00
Bus Returns to Lake Auditorium at 16:00

This tour will visit the Vejlerne Nature Reserve, one of the largest (5,600 ha) remaining wetlands in Denmark. The site features extensive Phragmites marshes and wet meadows and is ideal habitat for many important bird species, including bittern. Like most wetlands in Denmark the hydrology is carefully managed and the current character reflects an extensive history of different human management practices. Restoration and protection of ecological values are the current goals of what originally was two shallow saltwater fjords, but is now a mosaic of different salinities, having been artificially isolated from the adjacent Limfjord in the 1870s.

Additional information can be found at: http://www.avjf.dk/avjnf/qr-eng-vejlerne/

Sludge Treatment Reed Beds Systems (STRBs)

(Limited to 50 people)
Bus Departs from Lake Auditorium at 7:00
Bus Returns to Lake Auditorium at 17:30

This tour will highlight three Danish Sludge Treatment Reed Beds Systems: Two systems (Helsinge and Kallerup) which have been operational for more than two decades, and therefore provide insight into long-term management and performance, a new system established in 2018 (Pårup) which treats sludge from more than 10 WWTP.  Helsinge STRB has a capacity of 630 tonnes dry solids (DS) per year and consists of 10 basins, each having an area of 1,050 m2 at the filter surface and a maximum area loading rate of 60 kg DS/m2/year. In 2015 four more basins were established to achieve a strategy with an area load of 45 kg SD/m2/year and emptying one basin per year. A 800 m2 stockpile area covered by a greenhouse roof for post treatment of the sludge residue from the STRB basins before recycling was established in 2013. Kallerup STRB is a combined STRB and stormwater treatment system established in 1996 with a capacity of 240 tonnes DS per year. It consists of eight basins, each having a surface area of 500 m2 and a maximum area loading rate of 60 kg DS/m2/year. In 2003 two more basins were established to accommodate the climate change induced increased rain laoding. Pårup has a capacity of 450 tonnes DS per year and consists of 10 basins, each having a surface area of 1,000 m2 and a maximum area loading rate of 45 kg DS/m2/year. This tour is sponsored by Orbicon A/S.

Additional information about these three sludge treatment systems can be found at: www.orbicon.com (Expertise).

Canoe trip on River Gudenaa

(Limited to 40 people)
Bus Departs Lake Auditorium at 8:30
Bus Returns to Lake Auditorium at 16:00

This tour gives you the unique opportunity to do a 2½ hour canoe trip on River Gudenå – Denmarks longest river. We will start at Voervadsbro and sail towards Klostermølle (1½ hour). Here we will eat lunch and hear about the river management, the area’s biology and heritage. After lunch we continue our trip to Emborg Bro (1 hour) where the bus will pick us up. The trip grade is very easy and everyone can participate. It will be a relaxing trip enjoying the flora and fauna while we gently sail down the river.

Information about canoeing on River Gudenåen, inluding maps, can be found at https://en.sejladspaagudenaaen.dk/canoeskayaks/