21. Biogas Production from Brewer’s Yeast Using an Anaerobic Sequencing Batch ReactorGregor Drago Zupančič, Mario Panjicko, Bruno Zelić, 2017, original scientific article Abstract: Renewable energy sources are becoming increasingly important in the beverage and food industries. In the brewing industry, a significant percentage of the used raw materials finishes the process as secondary resource or waste. The research on the anaerobic digestion of brewer’s yeast has been scarce until recent years. One of the reasons for this is its use as a secondary resource in the food industry and as cattle feed. Additionally, market value of brewer’s yeast is higher than its energy value. Due to the increase of energy prices, brewer’s yeast has become of interest as energy substrate despite its difficult degradability in anaerobic conditions. The anaerobic co-digestion of brewer’s yeast and anaerobically treated brewery wastewater was studied using a pilot-scale anaerobic sequencing batch reactor (ASBR) seeded with granular biomass. The experiments showed very good and stable operation with an organic loading rate of up to 8.0 kg/(m3·day), and with a maximum achieved organic loading rate of 13.6 kg/(m3·day) in a single cycle. A specific biogas productivity of over 0.430 m3/kg of the total chemical oxygen demand (COD) inserted, and total COD removal efficiencies of over 90 % were achieved. This study suggests that the brewer’s yeast can be successfully digested in an ASBR without adverse effects on the biogas production from brewer's yeast/wastewater mixtures of up to 8 % (by volume). By using the brewer's yeast in the ASBR process, the biogas production from brewery wastewater could be increased by 50 %.
Keywords: anaerobic digestion, ASBR, biogas, brewer’s yeast
Published in RUNG: 15.06.2017; Views: 7151; Downloads: 0
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22. Anaerobna obrada industrijskih otpadnih voda iz prehrambene industrije: opravdanost i iskustvaMario Panjicko, Gregor Drago Zupančič, Gordana Šelo, Mladen Franjo, 2016, published scientific conference contribution Abstract: U radu je prikazana opravdanost primjene anaerobne obrade otpadnih voda iz prehrambene industrije na primjeru pivarske i mljekarske industrije. Otpadne vode prehrambene industrije većinom se ispuštaju u javni kanalizacijski sustav ili obrađuju aerobnim biološkim metodama. Porastom cijena energije i popularizacijom obnovljivih izvora, sve se više razmatra anaerobna obrada otpadnih voda prehrambene industrije, obzirom na visok sadržaj organskih tvari u njima. Te vode u pravilu imaju visoko organsko opterećenje (vrijednosti kemijske potrošnje kisika (KPK) otpadne vode pivarske industrije se kreću od 2500-4000 mg/L, a mljekarske industrije od 1500-3000 mg/L), koje je primjenom anaerobne obrade moguće sniziti do 90 %. Tako obrađene vode su, prema KPK vrijednostima, sličnije komunalnim otpadnim vodama te stoga i prihvatljivije za ispuštanje u javni kanalizacijski sustav. Uz snižavanje vrijednosti KPK, anaerobnom obradom proizvodi se bioplin, čijim je iskorištavanjem moguće supstituirati do 20 % prirodnog plina koji se koristi u proizvodnom procesu. Također, otpadnoj vodi moguće je dodavati i drugi tekući otpad (npr. kvasac, sirutka, proizvodi s isteklim rokom trajanja), koji može dodatno povećati proizvodnju bioplina do 60 %, bez negativnih posljedica na provedbu procesa. Uzimajući u obzir snižavanje pristojbi na otpadne vode i smanjenje potrošnje prirodnog plina, period povrata investicije u ovakve sustave iznosi od 3 do 5 godina što njihovu primjenu čini ekonomski opravdanom.
Keywords: anaerobna digestija, bioplin, energetska oporaba, otpadna voda
Published in RUNG: 08.11.2016; Views: 7143; Downloads: 0
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30. Določitev parametrov procesa anaerobno-aerobnega čiščenja odpadne vode in hidrolize odpadnega biološkega blata VIPAP VIDEM KRŠKO : (2. faza- pilotni testi, DIP odpadna voda)Gregor Drago Zupančič, Aleksandra Račič Kozmus, Nina Novak, Aljaž Klasinc, 2013, final research report Keywords: Anaerobna obdelava odpadne vode, Blato iz čistilnih naprav, Deinking, Papirniška odpadna voda, Termo-kemijska hidroliza
Published in RUNG: 21.10.2016; Views: 7294; Downloads: 0
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