Abstract
The 15-20% of the by-products of meat – and poultry industry – that unsuitable for human consumption – contains keratin. The slaughter technology of poultry produces large amount of poultry feather with 50-70% moisture content. This means more million tons annually worldwide (Williams et al., 1991; Hegedűs et al., 1998). The keratin content of feather can be difficulty digested, so physical, chemical and/or biological pretreatment is needed in practice, which has to be set according to the utilization method.Our applied treatments were based on biogas production, which is a possible utilization method. In the IFA (TULLN) Environmental Biotechnology Institute the feather was homogenized, and – according to the previous examinations – the most effective 1:2 feather-distilled water ratio or 1% NaOH-solution was used, and then treated with microwave (70, 130, 160 °C) during 1 hour time period. DM% and oDM% content was analyzed in the original samples, and the pH, Carbon-, Nitrogen-content in the output, too. Based on the received correlation coefficients (R) and related significance values (Sig.) I concluded, that the C-, N-content and the pH values weren’t influenced by any of the additives. The temperatureaffected all three tested factors. The temperature showed a strong coherency with the N-content and the pH value when distilled water was used and weak-medium coherency with the Carboncontent. With NaOH-solution treatment the temperature gave strong coherency with the C- and N-content, as well as medium coherency with the pH. Our objective was to determine the method with effectively the pre-treating of poultry feather for biogas production or composting and to prepare of the treated samples for N and C analyzing. Our next aims will be the elaboration of the technological parameters of heat pre-treatment and microbial digestion of poultry feather for biogas production.
Highlights
The 15-20% of the by-products of meat – and poultry industry – that unsuitable for human consumption – contains keratin
The temperature showed a strong coherency with the N-content and the pH value when distilled water was used and weak-medium coherency with the Carboncontent
Our objective was to determine the method with effectively the pre-treating of poultry feather for biogas production or composting and to prepare of the treated samples for N and C analyzing
Summary
Debreceni Egyetem Agrár- és Gazdálkodástudományok Centruma, Mezőgazdaság-, Élelmiszertudományi és Környezetgazdálkodási. A baromfi feldolgozóipar egyik legnagyobb mennyiségben keletkező mellékterméke a nedves, mintegy 50-70% víztartalmú toll, melynek felhasználása konfekcionált termék előállításra illetve díszítési célokra nem alkalmas. Az IFA (Tulln) Környezetbiotechnológiai laboratóriumában a tollat aprítottuk, majd az előzetes kutatások során leghatékonyabbnak ítélt 1:2-es arányban desztillált vízzel, vagy 1%-os NaOH-oldattal elegyítettük, majd mikrohullámú hőkezelést (70, 130, 160 °C) alkalmaztunk 1 óra időtartamig. A kapott korrelációs koefficiensek (R) és a hozzájuk tartozó szignifikanciaérték (Sig.) alapján megállapítottam, hogy az aprítás a C-, N-tartalmat és a pH-t nem befolyásolta egyik adalékanyag esetében sem. Desztillált víz alkalmazása mellett a hőmérséklet erős összefüggést mutatott a N-tartalommal és a pH-val, valamint gyenge-közepes összefüggést a szén-tartalommal. NaOH-os kezelés mellett a hőmérséklet erős összefüggést adott a C- és N-tartalommal, valamint közepes összefüggést a pH-val. Kutatásunk célja az volt, hogy meghatározzuk azt a módszert, mellyel hatékonyabban kezelhetjük a vágóhídról származó baromfi tollat biogáz célú további hasznosításhoz
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