Anaerobic Digestion of Finishing Cattle Manure

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Proceedings available at: The concept of utilizing feedlot manure in an anaerobic digester to power an ethanol plant, which then produces feed for cattle, has been called a closed loop system. In this system inputs are minimized and outputs are used by another component. This research looked at differences in manure quality within this system. Trial 1 considered incorporating distillers grains into the cattle diet and the effects on methane potential of the manure. For this system to be utilized by the feedlot industry in Nebraska, the manure collected for anaerobic digestion must be collected from soil-based open feedlot pens which account for over 95% of the feedlot cattle raised in Nebraska. Trial 2 addressed the methane potential of open-lot feedlot manure and its feasibility for anaerobic digestion.


<ul><li> 1. Anaerobic Digestion of FinishingCattle ManureA.K. Watson, S.C. Fernando, G.E. Erickson, T.J. KlopfensteinUniversity of Nebraska, Lincoln, NE</li></ul> <p> 2. Integrated BioRefineryFeedlot Ethanol PlantAnaerobic DigesterDistillers GrainsManureCropProductionGrain 3. Integrated BioRefineryFeedlot Ethanol PlantAnaerobic DigesterDistillers GrainsManureCropProductionGrain 4. Integrated BioRefineryFeedlot Ethanol PlantAnaerobic DigesterDistillers GrainsManureCropProductionGrain 5. ObjectivesTrial 1 Impact of cattle diet on manure qualityTrial 2 Impact of cattle housing and ash contamination 6. Materials and Methods Seven, 1 L digesters Turnover every 20 days (sampleand feed 1/20th every day) 9% DM 37 C pH 7.00 (sodium hydroxide) Anaerobic conditions, constantflow of N2 gas 7. 35 40 45 50 55 60 65Methaneproduction,L/gOMfedC3 d9 d18 d37 C20 d RTMesophilic ThermophilicVarel et al. 1980. Effect of temperature and retention time on methane production frombeef cattle waste. Applied and Environmental Microbiology 40:217-222. 8. Materials and Methods Methane Production Methane Detector RKI instruments Concentration &amp; flow rate= methane production DM and OM degradation Feed 9.0% DM Measure DM and OM ofeffluent 9. Impact of Diet Control Cattle 82.5% DRC 5% Molasses 7.5% Alfalfa 5% Supplement 0.986% urea WDGS Cattle 47.5% DRC 40% WDGS 7.5% Alfalfa 5% Supplement 10. Impact of Diet Complete collection in cement gutter 4 steers on each diet 3 d Manure slurry analyzed and weighed into individualfeeding allotments Switchback design 7 digesters Digesters on trt for 42 d (2 complete turnovers) Measurements made last 5 d 11. Cattle Performance0.1500.1550.1600.1650.1700.1750 10 20 30 40 50G:FCorn DGS Inclusion, % of diet DMBremer et al. 2011. Effect of distillers grains moisture and inclusion level in livestockdiets on greenhouse gas emissions in the corn-ethanol-livestock life cycle. Prof. Anim.Sci. 27:449-455.Linear QuadWDGS &lt; 0.01 &lt; 0.01MDGS &lt; 0.01 0.05DDGS &lt; 0.01 0.45 12. Digestibility0204060801000 40TotalTractDigestibility,%Corn WDGS Inclusion, % of diet DMCorrigan et al. 2009. Effect of corn processing method and corn wet distillers grains plussolubles inclusion level in finishing steers. J. Anim. Sci. 87:3351-3362.P-valueStarch 0.92OM 0.05DM 0.08NDF 0.72 13. Digestibility0. 15 30 45 60FecalOM,kg/dTotalTractDigestibility,%Corn/Sorghum WDGS Inclusion, % of diet DMLuebbe et al. 2012. Wet distillers grains plus solubles concentration in steam-flaked-corn-based diets: Effects on feedlot cattle performance, carcass characteristics, nutrientdigestibility, and ruminal fermentation characteristics. J. Anim. Sci. 90:1589-1602.Linear QuadStarch &lt; 0.01 &lt; 0.01OM &lt; 0.01 0.99NDF &lt; 0.01 0.89Fecal OM 0.04 0.32 14. Impact of Diet% of DM CONTManureCONTEffluentWDGSManureWDGSEffluentTotal N 3.95a 6.93d 3.79a 6.02cP 1.88a 4.40c 2.64b 4.82dS 0.45a 0.83c 0.51b 0.75cMg 0.48a 1.08c 0.65b 1.19ca,b,c,d Means within a row without a common superscript differ (P</p>


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