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1、Aimarettietal.InternationalJournalofEnergyandEnvironmentalEngineering2013,4:24http://www.journal-ijeee.com/content/4/1/24ORIGINALRESEARCHOpenAccessSustainablefermentationprocessingoftworevalorizedagro-industrialdiscards:carrotandbrewer'syeast1,2*1,2231NoraRAimaretti,Adria
2、naLClementz,AgustínCodevilla,MaríaLRojasandJuanCYoriAbstractAnintegratedandsustainablefermentationprocesswasdevelopedwhichenabledboththerevalorizationoftworegionalagro-industrialdiscardsaswellasby-productreuse.Carrotandbrewer'syeast,whicharecommonlyusedforanimalfeed,werep
3、rocessedtoobtain77.5Lofethanol,450kgofsolidwastecalledbagasse,970Lofliquideffluentcalledvinasse,and39.8kgCO2pereachtonofdiscardedcarrot.Resultsshowedthattheobtainedbagassewassuitableforfeeding55animals(calfs).Thedilutionofvinassewithfreshwater(1:5)satisfiedtherequirements
4、necessarytobeusedasbeverageforthesamenumberofanimals,leavingaremnantwhichcouldbenewlydiluted(1:5)andusedtoirrigatea0.025-hacarrotcrop,thelanddimensionrequiredtogrow1tonofcarrot.Keywords:Discards,Carrot,Yeast,Fermentation,Ethanol,SustainableBackgroundleadingtothedevelopmen
5、tofasustainableprocess,First-generationbiofuels,derivedfromagriculturalprod-whichcooperateswiththefinaldisposalofcertainucts(corn,sugarcane,palmoil,rapeseed,orsoybean),existingwastesineachregion[6-9].haveproducedanimpactongrainprices,tighteningtheAparticularcaseofaferment
6、ablesubstrateistheonesupplychainandtheavailabilityoflandforfoodproduc-representedbythediscardsofcarrot(Daucuscarota)tion[1].Thetransformationofforests,savannahs,orcultivation.ThecultivatedareainSantaFe(Argentina)ispasturelandintofarmsforbiofuelproductioncouldleadapproxima
7、tely1,500ha,anditsaverageyieldisnearly40−1togreaterCO2emissionthantheemissionreductiontons(t)ha.Only65%to90%ofcarrotharvestmeetsthethesebiofuelscouldproduce[2,3].Consequently,seriousqualitystandards;consequently,duringharvesttime,20damagestotheecosystemshavebeenproduced.S
8、econd-to100tofcarrotswithanoptimaldegreeoffreshnessgenerationbioethanolisabiofuelmadefromnonedib
