Technical Tours

The conference offers two interesting technical tours on the afternoon on the 9th of June (13:00-17:00). One tour is in the Malmö area (nearby the conference) and one tour is located in the Copenhagen area, Denmark.

The Swedish tour: Kretseum Natural Cycle & Knowledge Centre and Long-term experiments with sludge fertilization


Kretseum Natural Cycle and Knowledge Centre opened in January 2015. The centre is the hub of VA SYD’s educational work. The exhibition “The Sustainable City” illustrates the challenges we are facing in local and global environmental sustainability. The exhibition also shows our work towards fulfilling our environmental goals, both within VA SYD and together with our cooperation partners.
The tour offers a guided visit to the exhibition “The Sustainable City” and a presentation of VA SYD’s thoughts on how to pass on our sustainability knowledge to the next generation.

Since 1981 scientific field experiments have been carried out to investigate the effects on soil and plants of sewage sludge application on farm land. Digested and dewatered sludge from the Sjölunda and Källby Wastewater Treatment Plants in Malmö and Lund has been spread on experiment areas on Petersborg Farm south of Malmö and Igelösa Farm north of Lund. The crop choice has been the same as the crops regularly grown on each farm, following the regular crop rotation of the farms. The experiments are conducted as a block test with four blocks, where all the test treatments are included in each block. The tour offers a visit to the experiment areas on Petersborg Farm and a presentation of the results from 1981 and onwards.

The Danish tour: Biogas upgrading, Power to gas and Sludge incineration at the wastewater treatment plant Avedøre, Copenhagen

Avedøre wastewater treatment plant produces around 3 million m3 biogas per year, based on the primary and secondary sludges from the 350.000 p.e. plant.

So far the biogas has been utilized in a gas engine, but from the middle of 2016 the gas will be upgraded with a new enzymatic process.  The biomethane will be exported to the national gas grid. Furthermore parts of the CO2 will be converted to biomethane in a semi full-scale microbiological process. The necessary hydrogen will be provided by a 1 MW container plant by electrolyzing water, when the electricity price is low.

The new way of utilizing the gas means that more heat needs to be recovered from the sludge. New installations include sludge heat exchangers and remote heating pipes for both import and export.

At Avedøre WWTP the digested sludge is dried and incinerated in a fluid bed oven. The flue gas is treated in several steps before it is released to the atmosphere.

The tour will include a visit to all the installations mentioned above.

After the tour the bus will make a stop at Copenhagen Airport.