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Dissertations / Theses on the topic 'VFA'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Sundin, Anton. "Produktion av bioplast i Värmland? : Fermentering av olika avfallströmmar." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36624.

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Ett av världens största miljöproblem är plastnedskräpning. På många platser kan spår av mänsklig närvaro ses i form av skräp av plast. År 2011 tillverkades det 280 miljoner ton plast, det motsvarar ungefär 28 000 Eiffeltorn. I Sverige förbrukades år 2010 ungefär 880 000 ton plast. I Asien produceras ungefär 50 % av all världens plast och Kina står för cirka hälften av detta. Nordamerika och Europa står för cirka 40 % av världens plastproduktion. Resterande produktion av plast är fördelat på Afrika och Sydamerika. Kommersiell plast är uppbyggd av små enheter kallade
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2

Lee, Sung Jae. "Relationship between Oxidation Reduction Potential (ORP) and Volatile Fatty Acid (VFA) Production in the Acid-Phase Anaerobic Digestion Process." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2008. http://hdl.handle.net/10092/1262.

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The purpose of this research was to investigate the relationship between the oxidation-reduction potential (ORP) measurement and volatile fatty acid (VFA) production in the acid-phase anaerobic digestion process under different conditions of temperature and residence time. Two identical anaerobic digesters were operated while VFAs, SCOD, VSS, alkalinity, ORP and pH were measured. In digester 1, VFA production of 5,556 mg/L was generated with an ORP of -315 mv at a 10 day SRT; while 5,400 mg/L of VFA with an ORP of -389 mv was recorded in digester 2. The SRT was adjusted at 5, 8, 10, 12 and 15
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3

Häll, Sebastian, and Jani Körkkö. "Reducering av PIA och ledtider via VFA med upprätthållen leveranssäkerhet: en SME fallstudie inom tillverkningsindustrin." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-43723.

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Bakgrund: Små-medelstora-företag (SME) har en viktig roll i dagens samhälle. SMEs står idag för en stor del av arbetsgivarsegmentet samt för en stor del av den ekonomiska utveckling som sker i Europa. Inom tillverkningsindustrin är en av utmaningarna att säkerställa robusta processer med hög kvalitet. För SMEs innebär det kontinuerlig uppföljning av de interna samt externa processerna för att hela tiden försäkra sig om att verksamheten följer uppsatta ramar, vilket generellt kan vara svårt eftersom tillgängliga resurser är begränsade. Andra utmaningar som tillverkande företag står inför är lån
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4

malekjahani, seyed. "THE EFFECTS OF PH ON ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL (EBPR) WITH PROPIONIC ACID AS THE DOMINANT VOLATILE FATTY ACID (VFA)." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3712.

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pH control is a tool to improve some aspects of Enhanced Biological Phosphorus Removal (EBPR) process. Filipe et al (2001a, 2001b, and 2001c) found strong evidence that the stability of EBPR systems can be improved by increasing the pH of the anaerobic zone, thereby creating conditions where phosphorus-accumulating organisms (PAOs) are able to take up acetate faster than glycogen-accumulating organisms (GAOs). They explained this observation by comparing the growth rate of phosphorus-accumulating organisms (PAOs) and glycogen-accumulating organisms (GAOs) and found that pH has little effect on
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5

Bjarne, Katrin. "Optimerad förfällning med hydrolys och fermentation av primärslam för utvinning av kolkälla till efterdenitrifikation." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-210613.

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Att rena vatten är kostsamt, från både en ekonomisk och miljömässig synpunkt, då behovet av fällningskemikalier, kolkällor och energi är stort. Det är därför önskvärt att titta på alternativa lösningar som möjliggör reningsverk att bli mer självförsörjande och kretsloppsanpassande. Hammarby Sjöstadverket är en pilotanläggning för avloppsvattenrening belägen i Stockholms sydöstra stadsdel i Henriksdal och ägs av IVL, Svenska Miljöinstitutet samt KTH. Sedan pilotanläggning byggdes år 2002, har flera olika reningstekniker utvärderats där fokus ligger på att sträva efter miljövänliga och kretslopp
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6

Wogatai, Ulrika. "Förekomst av hyperopi bland hjälpsökande på en VFA-resa i Bolivia." Thesis, Linnaeus University, School of Natural Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6076.

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<p><strong>Syfte:</strong> Att undersöka förekomst av hyperopi i förhållande till läskunnighet hos hjälpsökande hos VFA i Bolivia, samt jämföra med studier från andra delar av världen.</p><p><strong>Metod:</strong> Studien utfördes i april 2010 på tre olika orter i centrala Bolivia. Patienterna sökte själva upp platsen för att få en undersökning. Subjektiv refraktion utfördes binokulärt, utan dimning, med hjälp av provbåge, provlåda och syntavla med Snellen E, uppsatt på 5 meters avstånd. Hyperopi räknades som sfärisk ekvivalent ≥ +1,00 D, myopi som ≤ –0,25 DS.</p><p><strong>Resultat:</strong>
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7

Restrepo, P. Ricardo J. "Dry matter digestibility and VFA production of selected feedstuffs using RUSITEC /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901273.

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8

Drakley, Catherine. "The dietary energy value of wheat for young broiler chickens." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391650.

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9

Kumpulainen, Eva. "Utvärdering och optimering av sidoströmshydrolysen vid Duvbackens reningsverk." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-206102.

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I Sverige förekommer strikta krav på fosforrening av avloppsvatten och detta har bidragit till att kemisk fällning har kommit att dominera som reningsmetod för fosfor vid svenska avloppsreningsverk. Fällningskemikalier är dyrt för reningsverken att köpa in och ger negativ påverkan på miljön vid tillverkning och transport. Strängare reningskrav har ökat behovet av nya reningsmetoder som på ett effektivt och miljövänligt sätt kan rena avloppsvatten från näringsämnen utan att kostnaderna för reningen blir för stora. Biologisk fosforavskiljning (bio-P) utnyttjar mikroorganismer som naturligt kan a
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10

Augustsson, Jimmy, and Jonathan Högfeldt. "Produktion av polyhydroxyalkanoater (PHA) av avloppsvatten från massa och pappersindustri : En studie kring bakteriernas förmåga att ackumulera PHA beroende på sammansättning av karboxylsyror." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-80660.

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Since the beginning of the 20th century plastic has been a widely used material, which has resulted in large quantities of plastic being produced in the last century. The plastics of today are mainly produced from fossil raw materials, which gives it a high climate impact. Plastic also has a long service life, which creates problems with handling after the new period when new plastic is produced at a faster rate than plastic debris can be recycled or incinerated. One possible approach is to switch from plastic from fossil sources to bioplastics, which is produced by renewable sources. This mea
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11

Brännström, Moa. "Utredning av alternativ för kostnadseffektivare pumpreparationer : vid Boliden Mineral AB:s gruva i Renström." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-72731.

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Företaget Boliden är världens främsta producent av zink och ledande i Europa medproduktion av koppar och nickel.För att nå malmen under jord drivs ramper och orter genom borrning, sprängningoch bergförstärkning. Dessa arbetsmoment kräver att stora mängder vatten tillförs,bland annat för att binda dammet som uppstår vid arbetsmomenten och även för attkyla maskinerna. Vattnet som är i omlopp i gruvan hanteras av länspumpar, sompumpar vattnet runt i gruvan eller upp till reningsverk.Bolidens gruva i Renström har länge haft problem med pumparna under jord, bådegällande den låga tillgängligheten oc
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12

Noohi, Joobani Ali <1987&gt. "“VFA production from urban waste through acidogenic fermentation process: a machine learning approach”." Master's Degree Thesis, Università Ca' Foscari Venezia, 2022. http://hdl.handle.net/10579/21632.

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Optimization of the dark fermentation process for the recovery of volatile fatty acids (VFA). The work is divided into pilot-scale fermentation tests on mixtures of sewage sludge and food residues, investigating different process parameters that influence fermentation yields. A machine learning approach will be used for data management and the development of a model that will be able to correlate the process performance (s) on the basis of different inputs (operational parameters).
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13

Jensen, Rebekah Paige. "Plane of Energy Nutrition on Blood Metabolites, Milk Production and Lamb Growth in Friesian Sheep." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6857.

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Small ruminant species are utilized for their diverse products including meat, dairy products, and wool. Effective and humane management are essential to maintain high production rates and comfortable animals. To attain this objective, managers needs to have an extensive knowledge of husbandry techniques, understanding of physiological processes, and familiarity with nutritional requirements. We examined the effects of varying feed components on two different ruminal species. In Chapter 1, we conducted a study to evaluate"¯the effects"¯of a low metabolizable energy (LME) and high metabolizable
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14

Foote, Andrew P. "EFFECT OF ERGOT ALKALOIDS ON BOVINE FOREGUT VASCULATURE, NUTRIENT ABSORPTION, AND EPITHELIAL BARRIER FUNCTION." UKnowledge, 2013. http://uknowledge.uky.edu/animalsci_etds/18.

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Ergot alkaloids present in endophyte-infected (E+) tall fescue are thought to be the causative agent of fescue toxicosis, a syndrome affecting cattle in the eastern United States. Many of the observed signs of fescue toxicosis are thought to be attributed to peripheral vasoconstriction; however, there are data indicating that ergot alkaloids can alter blood flow to the gut. An experiment was conducted using right ruminal artery and vein collected from heifers shortly after slaughter. Vessels were mounted in a multi-myograph to determine the vasoconstrictive potentials of ergot alkaloids presen
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15

PELEGRINO, Stela Gomes. "Par?metros ruminais em vacas em alta produ??o leiteira alimentadas com dieta total." Universidade Federal Rural do Rio de Janeiro, 2008. https://tede.ufrrj.br/jspui/handle/jspui/1760.

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Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-06-09T18:09:43Z No. of bitstreams: 1 2008 - Stela Gomes Pelegrino.pdf: 247744 bytes, checksum: edcaaef4e983d4522513a9fcb967acdc (MD5)<br>Made available in DSpace on 2017-06-09T18:09:43Z (GMT). No. of bitstreams: 1 2008 - Stela Gomes Pelegrino.pdf: 247744 bytes, checksum: edcaaef4e983d4522513a9fcb967acdc (MD5) Previous issue date: 2008-04-29<br>The search of better quality of the milk induces that changes and advances should be reached trought manipulation of de diet of the animals. The evaluation of the food absorption processes ha
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16

Seritti, Agostino. "Produzione di poliidrossialcanoati dalla frazione organica dei rifiuti solidi urbani: recupero e utilizzo di acidi grassi volatili in sistemi a colture microbiche miste." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20650/.

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Il seguente lavoro di tesi mira a sviluppare tecnologie e processi sostenibili per la produzione di biopolimeri, quali poliidrossialcanoati (PHA). I PHA sono poliesteri di base biologica prodotti dai batteri, in sistemi di fermentazione a colture microbiche miste (MMC). Come substrato carbonioso è stata utilizzata la frazione organica dei rifiuti solidi urbani (FORSU). Il processo consiste in un sistema accoppiato di fermentazione acidogenica e strippaggio in ipertermofilia (70°C), per la produzione e recupero di acidi grassi volatili (VFA), utilizzati come fonte carboniosa in MMC per la produ
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17

McDaniel, Michael Reid. "The effects of dosing feedlot cattle with Megasphaera elsdenii strain NCIMB 41125 prior to the introduction of a grain-rich diet." Thesis, Kansas State University, 2009. http://hdl.handle.net/2097/1666.

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Master of Science<br>Department of Animal Sciences and Industry<br>James S. Drouillard<br>Two experiments were conducted to evaluate the efficacy of [italic]Megasphaera elsdenii[italic] strain NCIMB 41125 and its potential use in the mitigation of ruminal acidosis. In experiment 1, a metabolism study was conducted to evaluate ruminal parameters, quantify changes in ruminal bacterial populations, and determine in vitro capacity for lactate utilization following intraruminal dosing of a placebo or [italic]M. [italic]elsdenii strain NCIMB 41125 and an abrupt diet change. Angus crossbred steers (n
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18

Carvalho, Daniela João Tavares. "Optimização da produção biológica de polihidroxialcanoatos por aplicação de processos de separação com membranas." Master's thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/12169.

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Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica<br>Os polihidroxialcanoatos (PHA) são plásticos biodegradáveis produzidos por uma grande variedade de microorganismos a partir de fontes renováveis. Actualmente, os PHA são produzidos de forma eficiente através de matérias-primas quimicamente definidas, fermentadas por culturas puras. No entanto, a implementação da produção tem sido limitada devido aos elevados custos desta, em comparação com plásticos convencionais. As culturas microbianas mistas surgem como uma alternativa, usando subprodutos industriais e sem nec
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19

Mallory, William, Rich Rivera, William Swinford, and BRB Consulting. "Improving Utilization of F/A-18 Simulator CUBIC Instructors at VFA-106, Naval Air Station Oceana, VA." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/7062.

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EMBA Project Report<br>EXECUTIVE SUMMARY: Strike Fighter Squadron ONE ZERO SIX (VFA-106), the only East Coast F/A-18 Fleet Replacement Squadron (FRS), has identified problems in Cubic Instructor (CI) capacity during periods of high demand as a result of combining series of aircraft, C/D and E/F, into larger “Super” classes. Subsequently, the squadron is forced to augment CIs with Instructor Pilots (IPs) or Instructor Weapons System Officers (IWSOs) to increase capacity or forego utilization of some of their 70 simulator hours allotted to them daily. A simulator process improvement study was un
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20

Cucurullo, Giuliana. "Produzione di biopolimeri da fanghi di depurazione mediante processi ibridi termochimici-biologici." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15529/.

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Il presente lavoro di tesi riguarda lo sviluppo di un innovativo processo di produzione di poliidrossialcanoati (PHA), volto a diminuire i costi ed incrementare la sostenibilità ambientale dei processi attualmente utilizzati per produrre PHA. A tal fine sono state utilizzate colture microbiche miste (MMC) presenti nei fanghi attivi derivanti dai processi di depurazione delle acque reflue e substrati di scarto dell’industria vitivinicola. I substrati sono stati inizialmente fermentati anaerobicamente per ottenere acidi grassi volatili (VFA), fonte di carbonio ideale per produrre PHA tramite MMC
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21

Pelegrino, Stela Gomes. "Par?metros ruminais em vacas em alta produ??o leiteira alimentadas com dieta total." Universidade Federal Rural do Rio de Janeiro, 2008. https://tede.ufrrj.br/jspui/handle/tede/589.

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Made available in DSpace on 2016-04-28T14:59:47Z (GMT). No. of bitstreams: 1 2009 - Stela Gomes Pelegrino.pdf: 247744 bytes, checksum: edcaaef4e983d4522513a9fcb967acdc (MD5) Previous issue date: 2008-04-29<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>The search of better quality of the milk induces that changes and advances should be reached trought manipulation of de diet of the animals. The evaluation of the food absorption processes have been a very important in the investigation of the animal nutrition. The objective was to evaluate the on ruminal fermentation para
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22

Bartek, Louise. "Life cycle assessment of DHA produced by microalgae using food waste : Assessing global warming, fossil energy use and effects on biodiversity." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415543.

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Biodiversity is a key component for life on Earth since it contributes to clean water, fresh air and food security. Today, fatty fish farmed in aquaculture is the main Omega 3 source consumed by humans, including the essential fatty acid docosahexaenoic acid (DHA). DHA origin from plants and accumulate in fish via the marine food web. Therefore, DHA in the form of fish oil is often added to fish feed used in aquaculture. This process is dependent on fossil energy and marine raw materials, which infer increased global warming, damage to ecosystem and ultimately loss of biodiversity. In order to
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23

Moriyasu, Tomoko. "Effects of monthly feedback of VFA measured by dual BIA method in Japanese patients with obesity: a randomized controlled study." Kyoto University, 2018. http://hdl.handle.net/2433/233843.

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Falzetti, Francesco. "Influenza di nanoparticelle di magnetite sull’elettrosintesi microbica di substrati organici da CO2." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Dopo una premessa preliminare sulla bioraffineria, si passa alla descrizione in dettaglio della carboxylate platform e dei suoi possibili sviluppi, fra cui vi è quello dello studio di sistemi bioelettrochimici, nello specifico elettrosintetici catodici. A questo punto si passa per una breve descrizione del metabolismo di un fango da digestione anaerobica, prima di arrivare all'obiettivo della tesi. L'obiettivo è udi fare una valutazione dell'influenza di nanoparticelle di magnetite sull'attività di alcuni sistemi bioelettrosintetici microbici (inoculati con fango da digestione anaerobica): un
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25

Truzzi, Federica. "Valorization of biorefinery wastewater to carboxylates." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8438/.

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La tesi della ha come obiettivo la valorizzazione delle acque di scarto derivanti dalla produzione del bioetanolo da colture cerealicole dedicate. Nella prima parte si studia la produzione di VFA mediante digestione anaerobica. In seguito, sono eseguiti batch tests per valutare la conversione dei VFA in MCFA. Infine, si focalizza sul processo di dowstream per il recupero degli acidi carbossilici dal brodo di fermentazione attraverso reactive extraction e back extraction.
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Bandino, Enrico. "Assessing the impact of ammonia content in VFA-rich streams on the PHA-storing MMC acclimatization and the PHA production stage." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The use of environmentally friendly products increased the interest in renewable resources as alternatives to petrochemical products. Polyhydroxyalkanoates (PHAs) are examples of such promising products, as they are biodegradable polymers with numerous potential applications. PHA production approach consists of using an open mixed microbial culture (MMC) and inexpensive feedstocks (waste or industry byproducts feedstock). The PHA process generally comprises three stages: (1) acidogenic fermentation (AF) stage (conversion of organic carbon into fermentation products); (2) culture selection stag
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Capitani, Giulia. "Produzione di miscele di acidi grassi volatili ad alto contenuto di acido caproico mediante fermentazione acidogenica di vinacce rosse." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14850/.

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La vinaccia è uno scarto proveniente dall’industria vinicola generato stagionalmente in abbondanti quantità. Questa possiede caratteristiche antimicrobiche che la rendono non prontamente biodegradabile. Una corretta gestione di questo scarto è tassativa per evitare danni all’ambiente. Attualmente, gran parte della vinaccia è trattata per recuperare etanolo mediante distillazione; una possibile alternativa per valorizzare questo scarto consiste nella produzione di acidi grassi volatili (VFAs), acidi carbossilici a corta catena, tra cui acido acetico (C2H4O2), propionico (C3H6O2), isobutirrico e
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Fagerström, Adam. "Verksamhetsutveckling i sömnadsproduktion : En fallstudie på en tillverkande process med syfte att skapa förutsättningar för ständiga förbättringar samt producera visuellt material för en gemensam målbild." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-78477.

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Följande examensarbete är den avslutande delen av högskoleingenjörsprogrammet innovationsteknik och design på Karlstads Universitet. Arbetet har en omfattning på 22,5hp och genomfördes ifrån januari- till juni 2020. Uppdragsgivaren är Granqvist Sportartiklar AB (fortsättningsvis i rapporten benämnt som Granqvists) som har sitt säte i Karlstad, medan uppdraget utfördes på deras fabrik i Zlotow, Polen. Granqvist har tillverkat handskar för sport- och skydd sedan 1984 och har alltid ägt hela produktionen, råmaterial till färdig slutprodukt. Då företaget har växt både i omsättning och personalstyr
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Alontaga, Barbara Mae, and Anna Axebrink. "Edible Fungal Production using Acetic Acid as Carbon and Energy Source." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-23396.

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Volatile fatty acids (VFAs) have become attractive and gained high research interest due to its significance for the chemical industry and economical advantage. These acids can be produced by utilizing organic waste such as food waste as substrate through anaerobic digestion. Anaerobic digestion is an environmental process that occurs naturally and produces biogas as the main product. VFAs are intermediate products formed during anaerobic digestion where acetic acid, a type of VFA, is the primary product. The main objective of this study was to utilize acetic acid as carbon and energy source f
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Marinetti, Andrea. "Recovery of Carboxylic acids from anaerobic fermented broth through ionic exchange processes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The recovery of Carboxylic acids were based on two particular objective: the study of the efficiency of a cation exchange resin, used in order to reduce the pH of the actual effluent, considering it is necessary to have a low pH for the anion exchange resin to be able to adsorb the acids from the effluent, and the preliminary studies perfomerd on the anion exchange resin, at various flow rates and both mode of operation, expanded and packed bed mode, using a simulated effluent, were the carboxylic acids were represented by just acetic acid, as the target molecule.
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Murolo, Alessandro. "Bioraffineria di vinacce per la produzione ed il recupero di acidi grassi volatili." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6826/.

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Obiettivo della presente ricerca è stato la valutazione dell’utilizzo degli scarti derivanti dal processo di vinificazione come substrato per la digestione anerobica finalizzata alla produzione di VFA (“Volatile Fatty Acids”). I VFA sono acidi grassi a corta catena, convenzionalmente fino a 6 atomi di carbonio, che possono essere utilizzati industrialmente nell’ambito della “Carboxilation Platfrorm” per produrre energia, prodotti chimici, o biomateriali. La sperimentazione si è articolata in due fasi principali: 1) Produzione di VFA in processi batch alimentati con vinacce e fecce come subst
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32

Ojong, Pascal. "Investigation of the effects of co-digesting of biodegradable waste and swine manure on the biogas process." Thesis, Linköpings universitet, Tema vatten i natur och samhälle, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-73444.

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Biomass and biomass-derived waste are important renewable energy sources which plays a vital role in greenhouse gas reduction from fossil fuel.  Biomass can be degraded in a process known as anaerobic digestion (AD) to produce biogas. Biogas is a mixture of methane and carbon dioxide which is utilized as a renewable source of energy. This project was based on the investigation of AD process in Nordvästra Skånes Renhållnings AB (NSR) a biogas facility in Helsingborg Sweden. A lab simulation of NSR digesters was conducted to evaluate the effects of swine manure on AD using two continuously stirr
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33

Zappalorto, Francesco <1996&gt. "Fermentazione acidogenica di matrici miste di origine urbana per la produzione di acidi grassi volatili (VFA): effetto del tempo di residenza idraulico in condizioni termofile." Master's Degree Thesis, Università Ca' Foscari Venezia, 2022. http://hdl.handle.net/10579/21452.

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Metodologia di lavoro. Il lavoro si articola su diverse runs di processo, in condizioni di fermentazione anaerobica termofila, su substrati organici di origine urbana. In particolare, verrà valutata la produzione di VFA in reattori di laboratorio (800 ml) a partire da miscele di “fanghi di depurazione-food waste”. I processi verranno monitorati su 3 differenti tempi di residenza idraulici (HRT). Parte sperimentale prevista. Test di fermenazione acidogenica in condizioni termofile tramite colture microbiche miste in reattori CSTR di laboratorio. La parte sperimentale prevede una fase inizial
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Lopes, Maria dos Anjos de Jesus Barros Monteiro. "Biovalorization of food wastes by anaerobic acidification processes." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/21693.

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Doutoramento em Ciências e Engenharia do Ambiente<br>Biodegradation is an eco-friendly option for the disposal and recovery of organic waste, including food waste (FW). These residues can be treated and recovered through anaerobic digestion processes, thereby reducing their pollutant content and, at the same time, producing high value-products such as volatile fatty acids (VFA). These compounds resulting from acidogenic fermentation are the preferred carbon sources for the production of added-value products, namely polyhydroxyalkanoates (PHA) or bioenergy, in the form of methane or hydrogen.
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35

Rey, Mickael. "Implantation du microbiote et mise en place des fonction du rumen chez le veau de race laitière et effet de la supplémentation en levures vivantes." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0086/document.

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Le veau nouveau-né possède un rumen peu développé et non fonctionnel. Au cours des premiers mois, les fonctions digestives s’établissent, avec l’implantation du microbiote composé majoritairement de bactéries, archées et protozoaires. Les objectifs de ce travail étaient doubles : i) caractériser et comprendre la séquence d’implantation taxonomique des microorganismes du rumen chez le veau par des techniques de biologie moléculaire et de dénombrement, ainsi que la séquence de mise en place des paramètres fermentaires (AGV et ammoniac) et des activités principales enzymatiques chez le veau en pé
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36

Ferré, Anna. "Process development for the robust production of polyhydroxyalkanoates." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/process-development-for-the-robust-production-of-polyhydroxyalkanoates(91fd1ca5-b907-4061-b232-99528b0862c0).html.

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Polyhydroxyalkanoates (PHA) are a family of biodegradable polyesters naturally synthesised by some bacteria and archaea. PHA have high industrial value as bioplastics for packaging and biomedical applications. However, their broader use is hindered by high production costs and uncontrolled variation of polymer properties. The extreme halophile Haloferax mediterranei shows bioprocess advantages that can be exploited for the low cost production of the PHA copolymer Poly(3-hydroxbutyrate-co-3-hydroxyvalterate) (PHBV). The focus of this thesis is to identify process variables responsible for the u
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Sardo, Nuno Miguel Garcez. "Selection of PHB-producing bacteria by using waste streams." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12620.

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Mestrado em Biotecnologia - Biotecnologia Industrial e Ambiental<br>Polyhydroxybutyrate is a type of biodegradable plastic, fully synthesized by bacteria, with similar properties to the ones of conventional plastics. This biopolymer can be produced by mixed cultures (activated sludge form waste water treatment plants) using the volatile fatty acids present in waste streams. Although the huge potential of this process, its application for the industrial production of PHB still lacks development. Throughout this work, three different strategies to obtain PHB-producing bacteria by using waste str
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38

Dogan, Eylem. "Two-phase Anaerobic Digestion Of Semi-solid Organic Wastes." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609280/index.pdf.

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The objective of this study is to illustrate that phase separation improves the efficiency of an anaerobic system which digests semi-solid organic wastes. Organic fraction of municipal solid waste (OFMSW) was the semi-solid organic waste investigated. In the first part of the study, the optimum operational conditions for acidified reactor were determined by considering the volatile solid (VS) reductions and average acidification percentages at the end of two experimental sets conducted. Organic loading rate (OLR) of 15 g VS/L.day, pH value of 5.5 and hydraulic retention time (HRT) of 2 days we
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39

Lazarevic, Danijel, and Johannes Engdahl. "Gäster i verkligheten." Thesis, Malmö högskola, Lärarutbildningen (LUT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-28130.

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Efter nio terminers studier på Malmö högskola så var det tid för det avslutande examensarbetet. Under dessa nio terminer hade vi fått olika upplevelser och erfarenheter av den verksamhetsförlagda tiden berättade för oss av våra medstudenter. Även våra egna erfarenheter varierade. Vi ville därför ta reda på mer om dessa upplevelser och vilka anledningar till variationerna var. Den verksamhetsförlagda tiden uppfattade vi som en stor del av utbildningen för en lärarstudent och den del av utbildningen som förbereder studenten mest för den blivande yrkesrollen. Vi var nyfikna på ifall den verksamhe
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40

Schmeier, Nara Paula. "Avaliação da operação de biodigestor no processo de digestão anaeróbia de resíduos sólidos orgânicos." Universidade do Vale do Rio dos Sinos, 2017. http://www.repositorio.jesuita.org.br/handle/UNISINOS/6863.

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Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2018-01-31T12:54:08Z No. of bitstreams: 1 Nara Paula Schmeier_.pdf: 877010 bytes, checksum: f002cde3446d9c5552d9a747ff097801 (MD5)<br>Made available in DSpace on 2018-01-31T12:54:08Z (GMT). No. of bitstreams: 1 Nara Paula Schmeier_.pdf: 877010 bytes, checksum: f002cde3446d9c5552d9a747ff097801 (MD5) Previous issue date: 2017-11-20<br>CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Petrobras - Petróleo Brasileiro S. A.<br>PROSUP - Programa de Suporte à Pós-Gradução de Instituições de Ensino Particulares<br>O proc
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Malerba, Gioacchino. "Progetto di un nodo sensore attivo a basso voltaggio per analisi ad ultrasuoni." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17355/.

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In questo elaborato è descritto il progetto di un nodo sensore attivo piezoelettrico adatto per applicazioni nell'ambito del monitoraggio strutturale, in particolare per l'analisi ad ultrasuoni. Tale tecnica si avvale di almeno una coppia di sensori: un pulsatore attivo e un ricevitore passivo. A tal proposito, i più utilizzati sono i trasduttori piezoelettrici, i quali trovano un largo impiego anche nell'ambito biomedico. Le attrezzature commerciali utilizzate in questo campo allo stato dell'arte hanno grande ingombro, costi elevati e un alto voltaggio. Tuttavia, tramite un'analisi prelimina
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42

Hoyos, Nestor Leonel Muñoz. "Análise comparativa do desempenho de reator anaeróbio híbrido e reator de manto de lodo de fluxo ascendente (UASB) aplicados ao tratamento de esgoto sanitário." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/170538.

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O presente trabalho teve como objetivo principal avaliar a performance e a estabilidade operacional de uma nova configuração de um reator anaeróbio híbrido (RAH) que combina um filtro anaeróbio de fluxo descendente seguido de uma câmara de manta de lodo de fluxo ascendente comparativamente ao reator UASB nas mesmas condições operacionais aplicados ao tratamento de esgoto sanitário. A avaliação da eficiência de remoção de remoção da matéria orgânica e dos sólidos suspensos nos reatores piloto foi por meio de testes da DQO, DBO, sólidos em suspensão totais (SST) e dos sólidos em suspensão voláte
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43

Forner, Mar 1980. "Multi-epitope peptide platforms for vaccine applications." Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2021. http://hdl.handle.net/10803/671028.

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Vaccination constitutes one of the most efficient and cost-effective methods of promoting global health. Nevertheless, few vaccines are fully effective, for manifold reasons ranging from intrinsic limitations to more contingent shortcomings related, e.g., to cold chain transport, handling and storage. In this context, peptide-based vaccines that consist of a fully synthetic approach mimicking B-and T-cell epitopes have emerged as an attractive alternative to overcome many such issues. Unfortunately, short peptides have generally been related to low immunogenicity and weak protection. In this t
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44

Bastidas, Oyanedel Juan-Rodrigo. "Thermodynamic based modelling of biohydrogen production by anaerobic fermentation." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20016/document.

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Ce travail de thèse a eu pour objectif principal l'étude thermodynamique des changements métaboliques dans l'acidogénèse. L'acidogénèse est un procédé anaérobie à double intérêt qui en traitant des résidus organiques, permet de produire des composés chimiques comme l'hydrogène, l'éthanol et les acides organiques. Par conséquent, l'acidogénèse se place comme un procédé biotechnologique dans le concept de bioraffinerie. En outre, ce processus n'a pas besoin de conditions stériles d'opération et fonctionne sur une large gamme de pH. Ces changements métaboliques sont dépendants des modifications d
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45

Sobotka, Josef. "Aplikační možnosti programovatelného zesilovače LNVGA." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-220430.

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This thesis deals with the theoretical description of the qualitative characteristics and parameters of some modern active elements, also discusses the theory of signal flow graphs at the level applicable for the following frequency filter design methods. The thesis is also generally discussed the issue with the circuit simulator PSpice modeling theory and voltage amplifiers on the basic 6-levels. The practical part of the work is divided into two parts. The first practical part is dedicated to design four levels of simulation model of components LNVGA element. The second practical part contai
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46

Larsson, Marcus, and Jonatan Skäryd. "Lärarstudenterns upplevelser av den verksamhetsförlagda utbildningen : "Handledaren måste veta vad VFU innebär så att han inte tror att det är praktik á la 80-talet"." Thesis, University of Kalmar, School of Human Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-2154.

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<p>Denna studie är ett försök att utforska lärarstudenters upplevelser av sin verksamhetsförlagda utbildning. Med hjälp av en intervjuguide kopplade till gällande styrdokument, utvärderingar och tidigare forskning genomfördes tio intervjuer som tydliggjorde flera aspekter som är av antingen positiv eller negativ karaktär för studentens upplevelser av VFU:n.</p><p>Det som upplevs som positivt av studenterna är att VFU-skolan ger dem en introduktion, att det finns tillgång till en egen arbetsplats, att det finns tid för reflektion, att personalen på skolan har en positiv inställning till dem som
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47

Acevedo, Juárez Brenda. "Estudio y modelación matemática del cambio metabólico de las bacterias responsables de la eliminación biológica de fósforo en el tratamiento de aguas residuales." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/62585.

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[EN] Phosphorus is very important in life because it plays an essential role in biological processes. The main use of phosphorus is in the fertilizer industry in the form of phosphates. These phosphates come mainly from phosphate rocks which might be exhausted in 50-100 years. The overexploitation of phosphate rocks has resulted in decreased quality of reserves, and it has raised the cost of extraction, processing and shipping. Moreover, phosphorus coming from wastewater, phosphate rock dissolution, and soil with an excessive supply of fertilizer, is deposited on the surface water bodies ca
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48

Skogsberg, Paul Ottosson, and Robin Kristiansson. "Den smutsiga praktiken - Verksamhetsförlagd handledning i lärarutbildningen." Thesis, Malmö högskola, Lärarutbildningen (LUT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-32901.

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Syftet med vår undersökning var att synliggöra studenternas upplevelse av handledningen under den verksamhetsförlagda tiden i utbildningen. Vi problematiserade hur handledningen leder till en progression som möjliggör att studenterna kan uppnå lärandemålen under sin praktik. Detta gjorde vi genom att studera handledarteorier samt Malmö högskolas syfte med den verksamhetsförlagda tiden. Vi använde oss av en webbaserad enkätundersökning för informationsinsamlingen och analyserade resultatet efter de valda teorierna. I resultatet uppgav de tillfrågade studenterna en positiv bild av sin progressio
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49

Digan, Laura. "Production de molécules plateformes pour la valorisation des déchets organiques solides : étude de processus physiques et biologiques impactant la qualité du mélange d'acides organiques." Thesis, Toulouse, INSA, 2019. http://www.theses.fr/2019ISAT0051.

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La consommation de ressources pétrolières, épuisables et non renouvelables, conduit à rechercher de nouvelles voies de production pour l’industrie chimique. De plus, la production d’Ordures Ménagères Résiduelles (OMR) continue d’augmenter à l’échelle mondiale. La fermentation acidogène des OMR permet de répondre au double objectif de traiter ces déchets et réduire leur quantité tout en produisant des molécules plateformes biosourcées (acides organiques) d’intérêt pour la chimie.La teneur en solides élevée des OMR et le souci de limiter les coûts de procédé justifient le choix du réacteur à lit
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50

Ahlner, Sara. "Prevalence of sub-clinical mastitis in Uruguay." Uppsala : SLU, 2004. http://vfak-epsilon.slu.se/archive/00000058/.

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