Effects of thermobarical pretreatment of cattle waste as feedstock for anaerobic digestion.
Lab-scale experiments were conducted to assess the impact of thermobarical treatment of cattle waste on anaerobic digestion. Treatment was at temperatures of 140-220°C in 20K steps for a 5-min duration. Methane yields could be increased by up to 58% at a treatment temperature of 180°C. At 220°C the abundance of inhibitors and other non-digestible substances led to lower methane yields than those obtained from untreated material. In an extended analysis it could be demonstrated that there is a functional correlation between the methane yields after 30 days and the formation rate and methane yield in the acceleration phase. It could be proved in a regression of these correlation values that the optimum treatment temperature is 164°C and that the minimum treatment temperature should be above 115°C.
Leibniz-Institute for Agricultural Engineering Potsdam-Bornim, Max-Eyth-Allee 100, 14469 Potsdam, Germany. Electronic address: jbudde@atb-potsdam.de.
Jörn
J
Budde
Leibniz-Institute for Agricultural Engineering Potsdam-Bornim, Max-Eyth-Allee 100, 14469 Potsdam, Germany.
Monika
M
Heiermann
Leibniz-Institute for Agricultural Engineering Potsdam-Bornim, Max-Eyth-Allee 100, 14469 Potsdam, Germany.
Teresa Suárez
TS
Quiñones
Leibniz-Institute for Agricultural Engineering Potsdam-Bornim, Max-Eyth-Allee 100, 14469 Potsdam, Germany.
Matthias
M
Plöchl
D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels; D002417:Cattle; D008401:Gas Chromatography-Mass Spectrometry; D005858:Germany; D006868:Hydrolysis; D008372:Manure / Q000382:microbiology*; D008697:Methane / Q000096:biosynthesis*; D011312:Pressure; D012044:Regression Analysis; D013696:Temperature; D013997:Time Factors
D056804:Biofuels; D008372:Manure; D008697:Methane
DM; FM; GC–MS; Hydrolysis; Inhibitors; LCM; LHW; Mathematical analysis; Methane yield; ODM; OM; P1; P2; PT[n]M[n]S; SCM; SCMW; SLCM; TBH; VOA; d; days; dry matter; fresh matter; gas chromatography mass spectrometry; liquid cattle manure; liquid hot water; organic dry matter; organic matter; plant 1; plant 2; solid and liquid cattle manure; solid cattle manure; solid cattle manure and water; thermobarical hydrolysis; time period in minutes and seconds; volatile organic acids