Presentation on theme: "Mycorrhizal Inoculated Biochar as an Active Filter of Dairy Wastewater Jacob Kelsey Master’s candidate Gund Institute for Ecological Economics and Ecological."— Presentation transcript:
Mycorrhizal Inoculated Biochar as an Active Filter of Dairy Wastewater Jacob Kelsey Master’s candidate Gund Institute for Ecological Economics and Ecological Design Rubenstein School for Environment & Natural Resources, University of Vermont Felix Wai Phd Student Rubenstein School for Environment & Natural Resources, University of Vermont
Objectives: To conduct a greenhouse column experiment in order to quantify the ability of biochar and mycorrhizal fungi to uptake phosphorus from a pollutant sample, representative of dairy farm wastewater. Results will be used to discern the efficacy of biochar, compared to other alternative substrates (i.e. steel slag), for incorporation into constructed wetlands.
Across the United States, eutrophication of freshwater value lost costs approximately $2.2 billion per year Vermont Agency of Agriculture says 95% of small scale dairy farms (<200 cows) need to address nutrient leachate problems Total costs for Vermont small scale dairy farmers = $30.5 million ~$38,000/ small farm
Integrated Constructed Wetlands Cleanse and manage water flow from farmyards Integrate the wetland infrastructure into the farm landscape, enhancing its biodiversity and beauty
Integrated Constructed Wetland Benefits Runoff and flood management Relative low cost and simplicity of operation Odor minimization Aesthetically pleasing Habitat and biodiversity enhancement
Integrated Constructed Wetland Limitations Farm constructed wetlands have a relatively large land requirement P uptake, compared to other nutrient treatment is often below desired levels, especially in colder climates http://www.fairfieldcity.nsw.gov.au/upload/images/SmithfieldWetland3May2006.jpg
Alternative substrates for increasing P uptake/retention in constructed wetlands http://www.cascadesteel.com/Images/manufacturing_process/02a.j pg http://www.uvm.edu/~cwrc/Slag%20image. JPG Best candidates to date are mostly industrial by products Of 57 materials tested for P adsorption, Electric Arc Furnace Steel Slag was found to be the most effective Vanadium and other heavy metal leaching possible
Biochar P uptake/retention Physical-Chemical: – Extremely high surface area – Increased Cation Exchange Capacity – Increased Anion Exchange Capacity (Lehmann, et al., 2007)
Biochar P uptake/retention, cont. Biological: -Beneficial microbe refugia -Mycorrhizal Fungi proliferation -Increased mycorrhizal populations positively correlated with P uptake www.d.yimg.com/kq/groups
Biochar P uptake/retention, cont. www.d.yimg.com/kq/groups
Hypothesis: Mycorrhizal inoculated biochar mixed in a gravel substrate in a simulated planted constructed wetland will uptake more phosphorus than a control treatment of plants and gravel substrate alone.