Willow evapotranspiration beds without discharge for handling of household wastewater & biomass short rotation willow coppice fertilised with nutrient from human urine mixture

Abstract

Storstmm County and A & B Backlund ApS have been co-operating in a project collecting
experiences and making investigations regarding the oldest evapotranspiration bed without
outlet in Denmark situated in Storstmm County. Results from the project Danish EPA M226-
0025 "EXPERIENCES AND EXAMINATIONS FROM A EVAPOTRANSTIRATION BED
WITHOUT DISCHARGE AT TAPPERN0JE" are presented in this paper. The bed has
worked very stable since 1992. A water balance has been calculated estimating the
evapotranspiration of the bed. Contents of nutrients in the wastewater and nutrients, heavy
metal and organic compounds in the soil have been analysed. Steam production of the
willows has been estimated. A & B Backlund ApS is engaged in further development of the
systems.
A small part ofan international project FAIR5-CT97-3947 (1998-2002) "BIOMASS SHORT
ROTATION WILLOW COPPICE FERTILISED WITH NUTRIENT FROM MUNICIPAL
WASTEWATER (BWCW) is dedicated fertilising willows with human urine mixtures. The
experiences has up to now been very positive and efforts are made to prolong the project and
establish further demonstration projects.
Willow evapotranspiration beds, willow vegetation filter, wastewater treatment, human urine
fertiliser, no-mixing toilets, diverting toilets, separation toilets, ecological engineering,
ecological sanitation