{"id":2506,"date":"2024-01-18T14:06:37","date_gmt":"2024-01-18T19:06:37","guid":{"rendered":"https:\/\/bioenertek.com\/blogue\/digestat-a-la-ferme\/"},"modified":"2024-02-15T16:04:06","modified_gmt":"2024-02-15T21:04:06","slug":"digestate-from-biomethanation","status":"publish","type":"blogue","link":"https:\/\/bioenertek.com\/en\/blog\/digestate-from-biomethanation\/","title":{"rendered":"Digestate from biomethanation"},"content":{"rendered":"\t\t
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How is digestate a winning solution for your fertilization strategy?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The by-product of the biomethanation of livestock effluent (digestate) offers added value to animal waste while reducing the environmental impact of the management of slurry and manure from the farm.<\/em><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The treatment of slurry by biomethanation allows the reduction of the organic load and pathogens, partly responsible for the contamination of surface water and groundwater. The greater fluidity of the treated slurry promotes its infiltration into the soil during its spreading, thus reducing the risk of fertilizer runoff, particularly phosphorus and nitrogen.<\/p>

Although the total fertilizer load is not modified by the process, the bioavailability of nutrients is improved, which increases their efficiency coefficient in the field and further reduces the total quantity of fertilizers to be applied to the crops.<\/p>

The use of the by-product resulting from the biomethanation of livestock effluent (digestate) not only has agronomic advantages, but also considerable economic and environmental advantages!<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Agronomical advantages<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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According to different studies, the digestate will have a positive impact on:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Physical and chemical characteristics of whole slurry and slurry treated by anaerobic digestion.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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1<\/sup>A lower C\/N ratio indicates that the carbon was used by the anaerobic bacteria to make CH4 in the digester, and the N2O formed will be converted into ammonia form (NH4+) and becomes highly assimilable by the plant and less volatilized in the digester. environment in N2O.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Economical advantage\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The digestate makes it possible to increase the forage yield (t\/ha) compared to whole slurry. It also provides as good performance as mineral fertilizers over 3-year corn-triticale rotations (Pastorelli et al. 2021). This situation can become an advantageous solution, since it is a product derived from biomethanized livestock effluent, but without gas which would in any case be evaporated into the environment following spreading in the field. .<\/p>

Here is a simulation comparing mineral fertilizers, whole slurry and digested slurry (digestate) adapted from the document Liquid by-products of slurry treatment, Porc Qu\u00e9bec (2004).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1<\/sup> Hay yield (RDT)
2<\/sup> Apparent nitrogen utilization coefficients (CAU) LOAM is a textural class of soil composed of less than 52% sand, 28 to 50% silt (or silt) and 7 to 27% clay.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Comparison of digested slurry (digestate) to whole slurry\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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With a higher hay yield per hectare, digested slurry (digestate) also provides an apparent nitrogen utilization coefficient 7% higher than whole slurry in clay loam soil<\/strong> and 14% in sandy loam soil. The higher the CAU<\/strong>, the more the total nitrogen fraction incorporated by the mineral or organic fertilizer is absorbed by the plant until harvest.<\/p>

When we evaluate the economic benefit of using digested slurry vs. whole slurry, this additional fodder per hectare represents:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1<\/sup> Approximate hay price at $245\/T (FAC, 2023)
2<\/sup> Calculated for a herd of 50 lactating cows, 50 ha under cultivation fodder and 3 cuts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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In summary, the use of digestate compared to whole slurry in this study would provide savings of more than $50 per hectare per cut<\/strong>, as well as between $0.16 and $0.42<\/strong> more per cow per day, not to mention the reduction in production costs. An increase in field yield is synonymous with a reduction in production costs<\/strong>, i.e.:<\/p>