Disputas: Nirmal Ghimire

Nirmal Ghimire holder prøveforelesning og disputas for graden philosophiae doctor (ph.d) ved campus Porsgrunn 25. mai.

25 May

Praktisk informasjon

  • Dato: 25 mai 2021
  • Tid: kl. 09.30 - 15.30
  • Sted: Porsgrunn
  • Last ned kalenderfil

    • Delta via Zoom her (trykk på lenken som blir aktiv når programmet starter)

    Program

    Kl 0930: Prøveforelesning «Strategies and challenges in bioenergy process development when utilizing syngas in AD-reactors».

    Kl 1200: Disputas. Nirmal Ghimire forsvarer avhandlingen «Methane Production from Lignocellulosic Residues».

    Bedømmelseskomité

    • Førsteopponent: Førsteamanuensis Ilona Sávári Horváth, University of Borås.
    • Andreopponent: Dr. Espen Govasmark, VEAS.
    • Administrator: Førsteamanuensis Roshan Sharma, USN.

    Veiledere

    • Hovedveileder: Førsteamanuensis Wenche Hennie Bergland, USN.
    • Biveileder: Avdøde professor Rune Bakke, USN.

     

     

     

     

Portrettbilde av Nirmal Ghimire som ser rett i kamera og smiler med munnen igjen. Mørkt krøllete hår og sorte firkanta briller, brune øyne. Nirmal Ghimire har til forsvar for graden philosophiae doctor (ph.d.) ved Universitetet i Sørøst-Norge, Fakultet for teknologi, naturvitenskap og maritime fag, innlevert avhandling i ph.d.-programmet prosess-, energi- og automatiseringsteknikk med tittel «Methane Production from Lignocellulosic Residues».

Han disputerer ved campus Porsgrunn 25. mai. Prøveforelesningen «Strategies and challenges in bioenergy process development when utilizing syngas in AD-reactors» starter klokken 0930 og disputas klokken 1200.

På grunn av koronasituasjonen gjennomføres prøveforelesning og disputas digitalt via Zoom (trykk på lenken som blir aktiv når programmet starter). Åpent for alle interesserte. 

Om avhandlingen 

Bio-based renewable products can be developed to replace fossil-based products. In this project, as part of the Norske Skog innovation project Pyrogas co-funded by The Norwegian Research Council (EnergyX Programme), lignocellulosic biomass, especially Norway spruce and birch, is examined for its potential in production of biochar for the metallurgical industry and biogas, a renewable fuel.

Pyrolysis, hot water extraction (HWE) and anaerobic digestion (AD) are used in combinations to optimize the carbon utilization of the lignocellulosic biomass. The organic rich liquid streams that are produced from pyrolysis and HWE are examined for their biogas production potential for enhanced carbon recovery of the total process. Hydrolysate has organics that are suitable feeds for AD but undigestible components and inhibitors make this challenging. APL is an even challenging substrate with many toxic components.

The anaerobic digestion of the hydrolysate led to a high methane yield at a good production rate, but both yield and rate were reduced when increasing the HWE temperature influenced by higher inhibitor production during the HWE pre-treatment. The APL methane yield was lower than hydrolysate and more varying.

It was slightly less influenced by the pyrolysis pretreatment temperature but can be improved further by HWE before pyrolysis. Both co-digestion of APL with hydrolysate and individual digestion of the two waste streams was successful and gives more insight into the possibilities of utilizing these organic rich waste streams.