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Metanaktivitet i förtjockad rötrest
University of Borås, Faculty of Textiles, Engineering and Business.
University of Borås, Faculty of Textiles, Engineering and Business.
2018 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Methane activity in sedimented digestate (English)
Abstract [sv]

Biogasproduktionen i Sverige ökar för varje år. På Sobacken i Borås produceras biogas från bland annat matavfall, slakteriavfall och avfall från livsmedelsindustrin. Varje dygn matas rötkammaren med 130 m3 slam. I framtiden kan det vara intressant att öka kapaciteten på biogasanläggningen. Detta kan göras genom att återföra förtjockad rötrest till rötkammaren. Denna studie undersöker möjligheten att sedimentera rötrest utan tillsats av polymerer och utvärderar metanaktiviteten i faserna.  Sedimenteringen utfördes i enlitersbägare under 24 timmar. De olika faserna överfördes i små reaktorer ihop med substrat. Det gjordes även blanker utan substrat. Reaktorerna placerades i vattenbad med omrörning vid 53,5 °C. Bildad metan analyserades i gaskromatograf.  Den största produktionen av metan skedde i rötresten och den minsta i klarfasen. Vi förväntade oss mest produktion initialt i bottenfasen vilket inte kan utläsas från resultaten. Om vi hade startat ett nytt försök med mer substrat kanske resultatet hade blivit annorlunda.

Abstract [en]

Biogas production in Sweden is increasing every year. The digester at Sobacken, Borås, is fed with 130 m3 of sludge each day. In the future the capacity of the biogas plant could be increased by recirculating thickened digestate to the process. This study examines the possibility to sediment digestate without the addition of polymers and evaluates the methane activity in the phases that arise.  The sedimentation was carried out in beakers of one litres for 24 hours. The different phases were transferred to small reactors and substrate was added. Blanks without any added substrate were also prepared. The reactors were places in a stirred water bath at 53.5 °C. Produced methane was analyzed in a gas chromatograph.  The largest amount of methane was produced in the digestate and the smallest amount in the clear phase. If we had set up a new experiment using more substrate the results might have been different.  

Place, publisher, year, edition, pages
2018. , p. 17
Keywords [sv]
Biogas, BMP, metanaktivitet, sedimentering, recirkulation
National Category
Engineering and Technology Chemical Engineering
Identifiers
URN: urn:nbn:se:hb:diva-21230OAI: oai:DiVA.org:hb-21230DiVA, id: diva2:1327908
Subject / course
Kemiteknik - Högskoleingenjör
Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-06-20Bibliographically approved

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CiteExportLink to record
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