Energy self-supply of large abattoir by sustainable waste utilization based on anaerobic mono-digestion

Anaerobic Digestion of Pretreated Industrial Residues and Their Energetic Process Integration

“…The main residues are wastewater and animal byproducts like blood, rumen content, fats, and stomach content. Most of these residues need to be treated before they can be released to the environment for final disposal (Ortner et al, 2015b). Residues from abattoirs can be divided into cow, swine, and poultry animal byproducts.…”

“…Depending on the ammonia level and the retention time residues can be digested completely. Still, several studies proved that nitrogen rich feedstock can be digested without huge process instabilities even on a long term (Ortner et al, 2014(Ortner et al, , 2015b. Specifically the addition of trace elements showed stabilizing properties during anaerobic digestion of nitrogen rich feedstock like blood and also during anaerobic wastewater treatment (Ortner et al, 2015a;Schmidt et al, 2018).…”

“…The produced biogas is combusted in a CHP unit and covers 50% of the heat demand and 60% of the electricity demand of the slaughterhouse. Thus, the cost reduction for reduced external energy demand and avoided disposal cost by implementation of AD sums up to about 63% (Ortner et al, 2015b).…”

“…The dairy industry requires heat for raw milk treatment and cleaning, and, like all other industries, requires power for the production process itself (pumps, stirring, cooling, etc. ) (Ortner et al, 2015b;Mainardis et al, 2019). The amount which is needed for each process depends on the industry, type of process, and amount of energy recovery by heat exchangers (Fritzson and Berntsson, 2006;Muster-Slawitsch et al, 2011;Ortner et al, 2015b).…”

“…) (Ortner et al, 2015b;Mainardis et al, 2019). The amount which is needed for each process depends on the industry, type of process, and amount of energy recovery by heat exchangers (Fritzson and Berntsson, 2006;Muster-Slawitsch et al, 2011;Ortner et al, 2015b). For all mentioned industries there is always a mixture of heat and power required.…”