The EXPOVAL project was concluded with the final conference in October 2016. The DWA thematic issue is free of charge.
You can find the event report of the EXPOVAL final event as a PDF-file here (German version).
You can find out how to get the DWA thematic issue here.
Further information about Ultrawaves' EXPOVAL-subgroup 'wastewater ponds' can be found under this link.