Agrochemical value of the liquid phase of wastes from fermentem during biogas production

Abstract

We tested the procedure of combined phytomass utilization Integrated Generation of Solid Fuel and Biogas from Biomass (IFBB) proposed for ensiled grass matter from the aspect of suitability of its use for a typical substrate of new Czech biogas stations, a mixture of cattle slurry, maize silage and grass haylage. The agrochemical value of the liquid phase from a biofermenter was also evaluated. We concluded that this procedure is suitable for the tested substrate and improves the agrochemical value of a fugate from biogas production. By chlorine transfer to the liquid phase, it enables to use the solid phase as a material for production of solid biofuels with a reduced threat of the generation of polychlorinated dioxins and dibenzofurans during combustion. However, the concentration of mineral nutrients in the liquid phase during IFBB procedure is extremely low after anaerobic digestion as a result of dilution with water, and so its volume value is negligible.

Digestate from Biogas Plants is an Attractive Alternative to Mineral Fertilisation of Kohlrabi

“…Field and pot trials to date report positive effects of digestate application to arable land in terms of yield [3][4][5] or no significant effects [6,7]. Experts are divided in their opinions on the properties and possibilities for the practical use of digestate as an organic fertiliser [8][9][10].…”

“…When fertilising with digestate it is therefore necessary to apply other sources of primary (labile) organic matter of good quality to the soil at the same time, e.g. by ploughing down all post-harvest residues, applying farm manure, compost, straw [1,9] or using a catch crop, e.g. clover-grass mixture.…”

Anaerobic degradability of organic matter of cattle faeces and a possibility of its utilization

“…In both these groups of fractions there are anaerobically degradable fractions to which all labile fractions also belong (Kolář et al, 2010). Mainly ecologists who fear that the atmosphere may be contaminated by greenhouse gases produced by animal farms are interested in the anaerobic degradability of organic matter (Gijzen, 1998;Alcock and Hegarty, 2006;Dong et al, 2006;Hegarty et al, 2007;Muenger and Kreuzer, 2008).…”

Testing the Impact of Waste from Anaerobic Digestion (Enriched with an Organic Component) on the Quality of Agricultural Land

“…Opinions on the use of digestate and its fractions as fertilizers for agricultural crops are inconsistent. For example, the 2006 study considers digestate an excellent fertilizer applicable without restrictions in agriculture (FITA, 2006 contrary, Kolář et al (2010) claims that the digestate is a weak mineral fertilizer due to the low content of mineral nutrients (nitrogen and potassium) in excess of water. The truth is that during biogas production, depending on the composition of input raw materials, the organic matter is transformed and stabilized and the organic carbon content (C) decreases by 20-95% (Möller 2015).…”