Willow can be used as an effective way to treat diffuse sources water pollution and point source effluents through irrigation systems.
What we know about willow used as biofiltration blocks
Fast growing willow has significant water use.
Extensive system of fibrous roots recycles mineral nutrients (nitrate and phosphate).
High rates of interception prevents macro nutrients leaching into the environment. Trials suggest a reduction of ~35% in P run off compared to grass controls.
Yields of woody biomass are increased.
Impact on wildlife minimised.
Much cheaper than water treatment using hard engineering methods.
Massive potential for greenhouse gas emissions reduction compared to conventional tankering and treatment of effluent.
What we're exploring next
Roll out of commercial scale demonstrators.
Impact of biofiltration on other uses e.g. fodder, compost and fuel.
Varietal differences in interception rates.
Who should care
Water companies
Dairy farms
Poultry farms
Localities with small-medium municipal sewage systems
Landfill companies
Food processors
Nw house builders requiring zero discharge systems
Users of PFAs (polyfluoroalkyl substances) e.g. airports and fire services.
