HAITL, M., VÍTĚZ, T., KOUTNÝ, T., KUKLA, R., LOŠÁK, T., GADUŠ, J.: Use of G-phase for biogas production. Acta univ. agric. et silvic. Mendel. Brun., 2012, LX, No. 6, pp. 89-96 Biogas is very promising renewable energy resource. The number of biogas plants increase every year. Currently there is a demand for new ways of organic waste treatment from production of diff erent commodities. One of the technologies which produce waste is biodiesel production. One of the wastes from the biodiesel

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... tion is G-phase which is mainly consisted from glycerol and methanol. The aim of work was to fi nd the eff ect of G-phase addition, to fermented material, on biogas resp. methane production. Two lab-scale batch anaerobic fermentation tests (hydraulic retention time 14 and 22 days) under mesophilic temperature conditions 38.5 °C have been performed. The positive eff ect of G-phase addition to methane production has been found. G-phase was added in three diff erent amounts of inoculums volume 0.5 %, 1% and 1.5 %. The highest absolute methane production has been achieved by 1.5 % addition of G-phase. However it was also found diff erence in specifi c methane production due to use of diff erent inoculum consisted of swine or cow manure. The specifi c methane production in hydraulic retention time of 14 days has been for the same G-phase dose 1.5 % higher for swine manure, 0.547 m 3 ·kg −1 of organics solids compare with cow liquid manure 0.474 m 3 ·kg −1 of organics solids. biogas, biodiesel, waste, G-phase, fermentation Address Ing. Martin Haitl, Ing. Tomáš Vítěz, Ph.D., Ing. Tomáš Koutný, Dr. Ing. Radovan Kukla, Ústav zemědělské, potravinářské a environmentální techniky, doc. Ing. Tomáš Lošák, Ph.D, Ústav agrochemie, půdoznalství, mikrobiologie a výživy rostlin, Mendelova univerzita v Brně Zemědělská 1, 613 00, Brno, Česká republika, prof. Ing. Ján Gaduš, Ph.D., Slovenská poľnohospodárska univerzita v Nitre, Katedra konštruovania strojov,