Effects of storage on characteristics and hygienic quality of digestates from four co-digestion concepts of manure and biowaste

Experimental Anaerobic Digestion of Poultry Droppings and Microbiological and Energetic Monitoring of the Process under Study

“…On livestock manure, it generally allows microbial hygienisation to be superior to simple storage. It often allows sufficient reduction of E. coli, with a reduction of about 10 2 [38]. Enterobacteria, Streptococci and Coliforms are only reduced by 10 2 CFU / g and are present at 10 5 [39].…”

Recovery of nutrients from biogas digestate with biochar and clinoptilolite

“…The recent growth in number of biogas plants, hence, digestate produced, has led to restrictions in several EU countries, not only in the allowed nutrient input per hectare on agricultural land, but also in the fertiliser application periods to minimize nutrient leaching (Paavola & Rintala, 2008;Drosg et al, 2015). Therefore, adequate digestate storage capacity is required, to be able to synchronize application with crop demand.…”

“…In many European Union countries, manure and digestate-spreading periods on agricultural land are restricted in order to minimize nutrient leaching and run-off, and therefore a large storage capacity for manure and digestate is needed. Storage is expensive and the transportation of large volumes of water is ineffective from both a logistical and economic point of view (Paavola & Rintala, 2008;Rehl & Müller, 2011). Moreover, environmental problems such as gaseous emissions of malodors, ammonia and greenhouse gases as well as nutrient runoff to streams and waterways may occur when digestate is applied to agricultural land (Hjorth et al, 2009).…”

“…In regions that have a nutrient surplus due to intensive animal production, mechanical separation is often used to facilitate the redistribution of nutrient surpluses to other regions (Møller, 2000;Paavola & Rintala, 2008;Jørgensen & Jensen, 2009). …”

“…Digestate is therefore often processed and managed in a similar way to animal slurry. In areas with a high animal density and hence a nutrient surplus compared to crop requirements, mechanical slurry separation can be used as a method to facilitate redistribution of nutrient surpluses to other areas (Møller, 2000;Paavola & Rintala, 2008;Jørgensen & Jensen, 2009). …”