Treating Wastewater & Field Runoff at the Dane Community Digester Site. Project Goals

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1 Presenters Susan Priebe, AquaTerra McFarland, WI (608) H. Tony Hartmann, Great Lakes Ag Energy (GLAE) Dr. John Hackney, GLAE Carl Chenoweth, PE, Resource Engineering Assoc. Middleton,, WI (608) ,

2 Treating Wastewater & Field Runoff at the Dane Community Digester Site NW Corner, White Gold Farm Project Goals Prevent N & P Loss into watershed Nutrient Management Best Practice Treat Farm Run-off & Tail water Reduce Waste Hauling Recycle Nutrients Utilize Digester Co-products Facilitate AD deployment Improve farm & digester economics

3 Project Partners Great Lakes Ag Energy * MATC/CERET * USDA- NRCS Resource Engineering Associates * Dan Healy Clear Horizons/Pieper Power * Snyder Excavating White Gold Dairy * AquaTerra * UW Madison Biogas Co-Products aka Manure Derivatives Fiber - Solids Digester Centrate Tank

4 Cascading Water Treatment * Proven Surface Water Treatment Components - White Gold Dairy, Waunakee, WI Algae & Aquaculture for Nutrient Filtration & Recycling PANR Project

5 Aquatic Crop/Biomass-energy/Filter Harvestable Bog Cascading aquaculture * Cattails, reeds, bulrushes Cattail starch/fat/protein/cellulose/filtration Farmstead Storm-Surface Surface Runoff (from Feed Storage & Operations Yards) Manure Lagoon Daily Separation and Controlled Outflow Methane Digesters Controlled Input (TP 200 mg/l) Storm-Runoff Sediment Basin Controlled Release (TP 30 mg/l) Turf-Algae Greenhouse Weir for 2-yr. Storm Outflow (TP 3 mg/l) Harvestable Bog Controlled Release (TP 15 mg/l) Constructed Wetland Swale for 100-yr. Storm Outflow (TP 5 mg/l)

6 Culture of Algal-Turf Assemblages and Duckweed Or Production of Water for Irrigation and Fertilizing Thru Secondary Treatment of Manure Derivatives Secondary Treatment of Manure Derivatives via Primary Productivity Culturing algal-turf assemblage in shallow troughs Culture of duckweed in tranquil ponds Systems replicated both inside greenhouse (year-around operation) and immediately adjacent outdoors (warm-season operation)

7 Secondary Treatment of Manure Derivatives Digester Centrate Greenhouse TP = 200 mg/l Outdoors Algal-Turf Troughs Duckweed Pond TP = 30 mg/l TP = 1-3 mg/l Temporary Storage Algal-Turf Troughs Duckweed Pond Irrigating and Fertilizing of Alfalfa Field What Is Algal Turf? Multispecies assemblage Mostly multicellular, filamentous, benthic (attached to solid surface) forms NOT phytoplanktonic; water-flow past attached forms delivers nutrients, removes byproducts Native species (Klebsormidium, Mougeotia, and Ulothrix in WI); no GMO s or exotics Non-sterile cultures open to environment ; not confined in photobioreactors Primary fixation generally directed to biomass production (cell walls and filaments), not to energystorage compounds

8 Algal-Turf Assemblage Algal Turfs: Culture Requirements Porous substratum Medium in continuous turbulent flow, to disrupt diffusion gradients and promote flash motions under high irradiances; adapted to lotic environments; shear velocity of at least 15 cm/sec required for adequate production Frequent harvests, to maintain early stage of succession Potential productivity requires high nutrient concentrations, extended photoperiods, elevated temperatures

9 Algal-Turf Porous Substratum Algal-Turf Batch Culture Continuous input of diluted centrate Periodic emptying of wavebucket Disruptive/turbulent flow across screen Continuous recirculation to holding tank

10 Algal-Turf Culture Troughs Algal-Turf Production -Biomass production on dairy manure derivatives (field studies): 5.5 g dry wt / m2 / day -Biomass production under laboratory conditions (tropical): dry wt / m2 / day -Nutrient uptake on dairy manure derivatives (field studies): g TN / m2 / day 0.1 g TP / m2 / day -Composition of dried algal-turf biomass: 31-44% crude protein g N / kg dry wt g P / kg dry wt g K / kg dry wt

11 Duckweed Angiosperms Five genera in family Araceae (Spirodela, Landoltia, Lemna, Wolffiella, and Wolffia) World-wide distribution Adapted to growth in lentic (still-water) environments Duckweed Batch Culture Periodic batch replacement of diluted centrate Periodic batch removal of cleared medium Continuous, slow stirring

12 Duckweed Production -Duckweed biomass production (avg. of varied studies): 5 g dry wt / m2 / day -Soya biomass production: 1.05 g dry wt / m2 / day -Alfalfa biomass production: g dry wt / m2 / day -Composition: 37% crude protein Duckweed starch content = 5-6 times corn starch PROJECT ENGINEERING

13 FARMSTEAD STORMWATER RUNOFF MANURE/LEACHATE MANAGEMENT

14 WATERSHED PROTECTION BEST MANAGEMENT PRACTICES

15 PROJECT DEVELOPMENT LOCATION & CAPACITY

16 SOIL EROSION PROTECTION WATER QUALITY PLAN

17 WETLAND DEVELOPMENT WATER QUALITY TREATMENT CHAIN

18 INTEGRATED WATER TREATMENT Aquaterra Stormwater Mgmt. Susan Priebe McFarland, WI

19 Wetland Plants Giant Burreed Soft Rush Wetland Plants Duck Potatoe Weed Hardstem Bulrush Wool Grass

20 Questions?