Utilization of stillages from bioethanol production from various substrates
Mogućnosti upotrebe džibre iz proizvodnje bioetanola na različitim supstratima
Autori
Djukić-Vuković, AleksandraMladenović, Dragana
Nikolić, Valentina
Kocic-Tanackov, Suncica
Pejin, Jelena
Mojović, Ljiljana
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Stillage is a main by-product of the bioethanol industry and, depending on the
origin of substrates for bioethanol production, it can be a significant pollutant
affecting the profitability of bioethanol production. Directing the stillage towards
the production of bio-based chemicals or high-quality feed is a preferred stra-
tegy. In this paper, a complete utilization of stillages of different origins was
assessed. Thin stillages from bioethanol production from molasses, wasted
bread and corn were chemically characterized, evaluated and compared as
substrates for lactic acid (LA) and probiotic biomass production by Lactobacil-
lus rhamnosus ATCC 7469, while solid fractions of wasted bread and corn stil-
lages were analyzed for feed. The impact of pH control using CaCO 3 or NaOH
was also examined, both in terms of LA production and valorization of the
remains generated in each process.A maximal LA productivity of 1.14 g/(L h)
was obtained on thin wasted bread stillage with pH... control by NaOH while the
number of viable probiotic bacterial cells was above 109 CFU/mL. The com-
position of the solid fraction of the wasted bread stillage was complementary
with the needs of monogastric animals, while the solid fraction of corn stillage
was more adequate for the nutritional requirements of ruminants.
Džibra je najznačajniji otpadni ili sporedni proizvod industrije bioetanola. U zavisnosti od
porekla supstrata koji se koriste u proizvodnji bioetanola, može biti značajan zagađivač,
pa utiče na profitabilnost proizvodnje bioetanola. Upotreba džibre u biotehnološkim
postupcima proizvodnje hemikalija ili visoko vredne stočne hrane je poželjna strategija
za smanjenje negativnih efekata džibre na životnu sredinu i profitabilnost proizvodn je
bioetanola. U ovom radu je analizirana mogućnost kompletnog iskorišćenja džibre.
Tečne džibre iz proizvodnje bioetanola na melasi, otpadnom hlebu i kukuruzu su
hemijski okarakterisane i upoređene kao supstrati za proizvodnju mlečne kiseline (MK) i
probiotske biomase soja Lactobacillus rhamnosus ATCC 7469, dok je čvrsti ostatak
hlebne i kukuruzne džibre analiziran kao hrana za životinje. Takođe je ispitan uticaj pH
kontrole pomoću CaCO3 ili NaOH sa aspekta proizvodnje MK i sa aspekta iskorišćenja
ostataka iz oba procesa. Maksimalna produktiv...nost MK od 1,14 g/(L h) je dobijena na
tečnoj džibri iz otpadnog hleba sa pH kontorolom pomoću NaOH, dok je broj živih pro-
biotskih bakterija bio preko 10 9 CFU/mL. Rezultati su pokazali da je sastav čvrste frak-
cije otpadne hlebne džibre komplementaran sa potrebama monogastričnih životinja, dok
sastav čvrste frakcije kukuruzne džibre više odgovara nutritivnim potrebama preživara.
Ključne reči:
stillage / bioethanol / revalorization / biorefinery / lactic acid / probiotics / feed / džibra / bioetanol / revalorizacija / biorafinerija / mlečna kiselina / probiotici / stočna hranaIzvor:
Chemical Industry and Chemical Engineering Quarterly, 2019, 25, 2, 97-106Izdavač:
- Belgrade : Association of the Chemical Engineers of Serbia
Finansiranje / projekti:
- Proizvodnja mlečne kiseline i probiotika na otpadnim proizvodima prehrambene i agro-industrije (RS-MESTD-Technological Development (TD or TR)-31017)
- Project #I- 1/2018 of Scientific and Technological Collaboration of Republic of Serbia and PR China