Irrigating Forests with Wastewater - natural and effective water treament?
Forests play a pivotal role for sustainable water supply. In drier climates, wastewater treatment and forests can benefit from each other. Treated wastewater is generally returned to waterways downstream, eventually entering our oceans. With growing water insecurity due to ecosystem degradation, climate change and increasing population and water demands, innovative water management solutions are needed.
What if we closed the cycle and forests were part of the water treatment process – returning water upstream to be filtered through natural processes and to recharge groundwater and aquifers to be used again?
Successful examples from North and South Africa, and United States - where wastewater is recirculated and cost- efficiently used to irrigate forests - will forward the discussion on water management solutions in areas facing water challenges. The increasing requirement of rural and peri-urban landscapes to be “multi-functional” - meeting commercial production needs, fulfilling conservation targets and addressing socio-economic needs of local stakeholders - will set the frame for an interactive dialogue between organizers, invited speakers and the audience.
- Lotta Samuelson, SIWI Swedish Water House
Eduardo Mansur, FAO
Akissa Bahri, INAT
16:25 Case Studies
- Jay Baghwan, WRC
- Jan Cassin, Forest Trends
- Elaine Springgay, FAO
16:40 World Café: Learn more by discussing the cases with the presenters
17:10 Wrap-up: How can wastewater be better integrated into forest management?
17:25 Concluding remarks
17:30 Close of session
This August, world leaders, water experts, development professionals and policy-makers gathered in Stockholm for a week-long meeting focused on finding ways to better use, and reuse, the world’s increasingly scarce fresh water. World Water Week events draw over 3,000 participants from nearly 130 countries with the 2017 theme being, “Water and waste: Reduce and reuse”. To keep forests and the important role they play within the discourse of the water sector, FAO, SIWI, CIFOR, SIANI, Forest Trends, IUFRO, Focali, The Swedish Forest Agency, and SLU joined to discuss ‘Irrigating Forests with wastewater: Natural and effective water treatment?’
The event opened with keynote speeches by Eduardo Mansur, Director, Land and Water Division, FAO and Akissa Bahri, National Agricultural Institute of Tunisia, who provided overviews of the importance of irrigating forests with wastewater to address global issues of water scarcity and environmental degradation. They discussed the benefits this practice could provide for dryland regions in efforts to combat desertification. Water optimization, potential for nutrient recycling and forests filtering wastewater were stressed as effective climate change adaptation strategies. “Wastewater has huge untapped potential for resource recovery and reuse!”, emphasized Ms. Bahri, adding, “Globally, about 300 km3 of municipal wastewater are generated each year. Theoretically, this wastewater could be used to irrigate more than 40 Mha of land, provide free fertilizer application, and provide electricity to about 130 million households”. Wastewater use in planted forests and agroforestry raised concern about public and environmental health and food safety issues, which were validated by the speakers who agreed dealing with the risks and applying wastewater safely would be essential, but that this did not hinder its application and that forests and agroforestry systems are often safer than traditional crops.
Short presentations of case studies followed the keynote speeches: Elaine Springgay, FAO, “Greening the forest” in North Africa; Jay Bagwan, WRC presents “Experimenting with faecal sludge in South Africa” and Anders Finnson presenting the Swedish REVAQ wastewater certification scheme, provided further understanding of the potential. Participants were invited to move around the room and learn more about the cases directly from the presenters; each providing unique perspectives and applications. Case studies equally highlighted the benefits, safety concerns and the need for broad stakeholder engagement. The conversations were highly engaging due to the controversial aspects of wastewater, and because many of the World Water Week participants were unfamiliar with forest and water linkages, and the application of treated wastewater for forests.
Treated wastewater in Mediterranean countries“The use of treated wastewater in agroforestry systems:cooperation among Mediterranean countries,results of the first year of GCP/RAB/013/ITA project activitiesand future developments”
Using treated wastewater in Willow plantations in SwedenShort&amp; rotation willow coppice is cultivated not only to produce biomass for energy, but also to treat waste products, taking up pollutants from soil and water.
Plant response in Swedish Willow PlantationsTreatment of landfill leachate by irrigation of willow coppice - plant response and treatment efficiency
Faecal Sludge Management in AfricaThe Sustainable Sanitation Design Concept for Sludge Treatment for Cities in Africa
Cleaning wastewater while preserving forest in Florida, USAhttp://wnct.com/2016/08/02/jacksonville-implements-new-way-to-clean-wastewater-preserve-forest/
Jacksonville implements new way to clean wastewater, preserve forest
Sustainable Forest Management (SFM) Toolboxhttp://www.fao.org/sustainable-forest-management/toolbox/modules/use-of-treated-water-in-forestry-and-agroforestry/cases/en/
Learn more about using treated wastewater in forestry and agroforestry in drylands through the FAO sustainable forest management toolbox.