Environmental Technology Verification, Canada has evaluated testing of the Marvel at the University of Guelph. They have authorized Global Earth Products to use the ETV Canada logo in our marketing efforts. ETV Canada determined a 65% reduction in greenhouse gas emissions when utilizing liquid hog manure with the Marvel system, when compared to in-ground concrete storage with a lid.
As you can surmise, results would be even more dramatic if the spreading of the manure on farm fields had been included in the testing.
"Global Earth Products' Marvel® Liquid Manure Composter System for On-Farm Manure Management, when operated in accordance with the vendor's specifications at temperatures between 55°C and 70°C, with moisture content between 60% - 80%, and under a liquid swine manure to wheat straw carbon substrate ratio of 5:1,
Greenhouse gas emissions (nitrous oxide and methane gas expressed in CO2 equivalents) during the process are reduced by 64% in comparison to a conventional system of liquid/slurry manure management by inground, concrete lined tank storage (as defined by the International Panel on Climate Change1); and,
• The solid compost product has the following properties:
• Average total N, P, and K concentrations on a dry matter basis, in a ratio of approximately 3:1:3;
• Contains metal concentrations not exceeding the Bureau de Normalisation du Quebec, Agriculture and Agrifood Canada Trade Memorandum and Canadian Council of Ministers of the Environment (Category B) Compost Quality Standards2,3,4 for the following metals: As, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, Se, and Zn;
• Contains no detectable Salmonellae, and E. coli concentrations acceptable to the Bureau de Normalisation du Quebec, Agriculture and Agrifood Canada Trade Memorandum and Canadian Council of Ministers of the Environment Standards2,3,4; and,
• An average carbon to nitrogen (C:N) ratio of 12.68."