Gas Reduction Benefits from Storage to Application of Anaerobic Digestion and Solid-liquid Separation ofDairy Manure

摘要

Manure management at dairy production facilities has a strong potential for the abatement greenhouse gases GHG and NH4. A nine month study was completed to study the effects of anaerobic digestion and solid liquid separation on GHG and NH4 emission. The study consisted of a 6 month storage study and a 3 month field application study with weekly gaseous measurements soil and bi-weekly manure and soil measurements. Treatment differences mainly existed from the total emissions from storage with only theseparated solids having a significant increase in emissions in GHG and NH3 emissions. Methane emissions from storage were significantly reduced in the digested separated liquid slurry and separated solids. Digestion alone did not significantly reduce methane emissions. Digestion significantly increased ammonia emissions the digested slurry however, separation reduced this emissions in both in the digested liquid and both solid portions. Digestion and separation into a liquid portion reduced C02 emissions. The solids potions of the digested and undigested significantly increased C02 and N20 emissions from storage. Digestion and separation both showed mitigation potential of GHG and NH3 although no complete reduction in all gas species was demonstrated.