Manure methane production

Factors affecting methane production from manure... 

Some other experiments at various scales and using distinct organic waste sources have been carried out. Volumes between 0. lm3 and 10,000 m3 were used. In every experiment the methane production increased. Best results were obtained with pig manure. In this case the biogas production increased to 200 %. The experiments thus proved that it was possible to increase the gas production using intensified microbiological biomass decomposition. 

Anaerobic digestion yields of the slurries are given in Table 2.5. Due to the higher proportion of lipids in manure, the methane production is higher than in wheat straw. The total amounts of lipid and protein, in particular, are lower in straw than in manure and thus the theoretical methane yield is significantly lower in wheat straw than in manure (Table 2.5). The average methane yields of manure and wheat straw were 14.7% and 10.4% of volatile solids, respectively (Demirbas and Ozturk, 2004). 

Lapp, H. M. and L. C. Buchanan. Agriculture Canada, Ottawa (1978). A Travel Report on a Study of Methane Production From Animal Manure in the Midwestern United States. 44 p. 

Soc. Agric. Engrs. St. Joseph, Mich. (1975). Start-up of Pilot Scale Swine Manure Digesters for Methane Production. Pp. 234 - 238, 243. 

I would like an explanation for the increase in methane concentration. Not only the number of cattle you have has changed, but also the kind of cattle and how they are treated. Husbandry has changed, I think, very much all over the world, at least in all industrialized countries. Straw is no longer used to pick up the feces of the animal. Now liquid manure is used, and no manure with straw content. From this liquid, the methane production will be much larger than it has been before. I have no figures for this, but it might be that agricultural scientists could furnish some information. One should at least take this into consideration. 

The logic of attacking BST for fear of increasing antibiotic residues is flawed. The previously cited OMB study even reported on a favorable environmental impact statement with BST use. This is based on the fact that BST-induced increase in milk production per cow would decrease the total number of cows in our country. This could result in less pollution through decreased use of fertilizers, less cow manure, and less methane production. Why don t environmentalists quote these results ... 

Lansing S, et al. Methane production in low-cost, unheated, plug-flow digesters treating swine manure and used cooking grease. Bioresour Technol 2010 101(12) 4362-70. 

Kaparaju P, et al. Effects of mixing on methane production during thermophilic anaerobic digestion of manure lab-scale and pilot-scale studies. Bioresour Technol 2008 99... 

Wellinger A, Kaufmann R (1982) PsychrophUic methane production from pig manure. Process Biochem 17 26-30... 

Lehtomhki A, Huttunen S, Rintala JA (2007) Laboratory investigations on co-digestion of energy crops and crop residues with cow manure for methane production effect of crop to manure ratio. Resour Conserv Recycl 51 591-609... 

Wohlgemut, O., 2006. Co-digestion of hog manure with glycerol to boost biogas and methane production. In Department of Civil Engineering. University of Manitoba, Winnipeg, Manitoba vol. (M.Sc. thesis). 

Juarez-Rodriguez et al. applied the sludge derived from anaerobically digested cow manure in the production of biogas (methane-air), to maize (Zea mays L.) cultivated in a nutrient-low, alkaline-saline soil with EC 9.4 dS m 1 and pH of 9.3. The results showed that the C02... 

A limited number of digesters were built in Europe after World War II to use manure for the production of methane gas for farm fuel. The use of these units were generally discontinued about 1960 as low cost liquid petroleum fuel again became available. Findlay following two surveys of 95 Gobar Gas Plants in-... 

The production of methane from animal manure is technically feasible under the management of a livestock enterprise operator. Many small farmers are successfully operating small scale digesters in tropical countries. 

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