Biosolids Resource Recovery Monthly Report

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Emil Newton
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1 December, 214 Biosolids Resource Recovery Monthly Report DC Water Resource Recovery Division 5 Overlook Avenue SW Washington, DC ; (fax) cpeot@dcwater.com The mission of the DC Water biosolids management program is to provide reliable, diversified, flexible, sustainable, environmentally sound, publicly acceptable, and cost-effective reuse of the biosolids assets produced by the Blue Plains Resource Recovery Plant while helping preserve agriculture and protect the Chesapeake Bay.

2 December 214 Resource Recovery Report In December, biosolids hauling averaged 89 wet tons per day (wtpd). Of this total, 711 wtpd were lime stabilized Class B, and 98 wtpd were digested. The graph below shows the total hauling by contractor for the month of December. Average % solids for the unlimed cake was 27.2%, and digested material was 26.5% Average lime dose for the Class B biosolids was 27.4%. At the end of December the Cumberland County storage pad had approximately 5, tons of lime stabilized and 2,16 tons of digested materials (~25, tons capacity), The Cedarville lagoon had approximately 8,225 tons of Blue Plains biosolids (~3, tons capacity). Average Daily Hauling by Contractor for December average 1 target Recyc WSSC Nutriblend total Average Daily Biosolids Production and Reuse Cost Tons biosolids generated (avg/day) tons $/month Linear ($/month) $2,, $1,9, $1,8, $1,7, $1,6, $1,5, $1,4, $1,3, $1,2, $1,1, Biosolids Reuse Cost ($/month) $1,, Date

3 Metric Tons CO2 Equivalency Concentration (mg/kg) Concentration (mg/kg) The graphs below show the EPA regulated heavy metals in the Blue Plains biosolids for the month of November 214. As can be seen in the graphs, the Blue Plains levels are considerably below the regulated exceptional quality limits, the national average levels surveyed in 1996, and DCWater the European Biosolids Union (EU) Recycling limits. Program The EU limits are more conservative than the USEPA Greenhouse limits, and Gas Blue Balance Plains biosolids Benefits metals content is lower than the EU standards as well. November 214 Totals BLUE PLAINS BIOSOLIDS METALS COMPARISON November Arsenic Cadmium Mercury Selenium Copper Nickel Zinc Lead Metal avoidance EU LIMITS of - PROPOSED inorganic 225 carbon sequestration AMSA in 1996 Survey total Mean net (>19 benefit WWTP) fertilizers the soil Monthly Average EPA - 53 Exceptional Quality Limits Carbon Footprint The graphs below represent the carbon footprint of the DC Water organization for Staff developed a model to calculate this based on input from each department. The first graph shows the total footprint for each year, broken down by source of the carbon. The second graph shows a more detailed breakdown of the 213 data, and the third graph represents the breakdown for the largest emitter, DWT (Blue Plains). Carbon credits are from sequestration of carbon during land application of biosolids, and the associated avoidance of inorganic fertilizer, which requires energy for production. Land applying biosolids avoids this energy use. Very soon, staff will compile and report the 214 data, and will begin to report monthly data. DC Water Annual GHG Emissions Estimates (Metric Tons CO2e) 3, 25, 2, 15, 1, 5, - (5,) (1,) (15,) Biosolids Processing & Land App 76,386 79,742 98,971 13,523 96,598 83,547 92,593 Electricity 139, , , , , , ,14 Vehicle (fuel usage) 2,989 2,586 2,456 2,61 2,481 3,4 2,29 Refrigerants Process Emissions 15,418 14,459 16,879 18,45 19,883 21,822 22,365 Natural Gas 2,984 2,967 3,547 3,55 3,82 3,118 5,18 Carbon Credits (97,583) (13,93) (117,499) (113,26) (111,511) (86,657) (82,369)

4 % of total on-site GHG emissions Methanol Production 1,827 4% Biosolids Lime Production 13,736 6% Chemical Hauling 1,835 1% Biosolids Hauling 11,268 5% Process Emissions Effluent Discharge 2,221 1% Methane Emissions from Landfilling Biosolids 12,539 5% N2O Emissions from Land Application of Biosolids 42,387 17% Process Emissions CO2 from Addition of Methanol 19,27 8% Natural Gas DWT 3,745 2% 8,116 3% 8,229 3% 213 GHG Emissions (Metric Tons CO2e) Electricity DWT 19,795 44% Electricity DSS Electricity DWS Electricity DWT Natural Gas CS Natural Gas DSS Natural Gas DWS Natural Gas DWT Natural Gas FLEET Vehicle (fuel usage) Compressed Natural Gas (CNG) Vehicle (fuel usage) Diesel Fuel No. 1 and 2 Vehicle (fuel usage) Motor Gasoline Vehicle (fuel usage) Biodiesel (B1) Vehicle (fuel usage) Ethanol (E85) Vehicle (fuel usage) Biodiesel (B2) Vehicle (fuel usage) Biodiesel (B5) Refrigerants Refrigerants Process Emissions CO2 from Addition of Methanol Process Emissions N2O from Dentrification Process Emissions Effluent Discharge (process emissions) Biosolids Biosolids Hauling (fuel usage/distance travelled) Biosolids Chemical Hauling (distance travelled) Biosolids Lime Production Biosolids Methanol Production Biosolids N2O Emissions from Land Application of Biosolids Biosolids Methane Emissions from Landfilling Biosolids 1% Blue Plains on-site greenhouse gas emissions by source (213, %) Effluent Discharge 75% N2O from Dentrification CO2 from Addition of Methanol 5% Vehicle (fuel usage) Natural Gas Electricity 25% %

5 December Highlights The Blue Plains Garden had another bountiful year, producing nearly 8 pounds of eggplants, tomatoes, yellow and spaghetti squash, strawberries, lettuces and herbs. The new DC Water Tour Guide and others stopped at the garden and the adjacent compost shed during tours for hundreds of people. Seeing (and tasting!) the benefits of using biosolids compost has proven an effective way to influence the opinions of visitors and leave a lasting impression. The harvest from the garden was provided to various offices around Blue Plains and in the COF cafeteria.

6 Map of Blue Plains Biosolids Applications and Agricultural $ s for November 214 Environmental Benefits The quantity land applied in November coming directly from the plant and from storage facilities equaled 29,318 tons. Taking into account the fuel required to transport biosolids to the field, the net benefit of the land applied material is 1614 metric tons CO 2 equivalent avoided emissions. This is equivalent to taking 3,352,63 car miles off the road in the month of November (assumes 2 mpg, 19.4 lb CO 2 equivalent emissions/gallon gas EPA estimate). The cumulative total avoided carbon emission since January, 26 is 136,374 metric tons CO 2 equivalent.

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