• Castle Street

    KW14 7JD Thurso

    United Kingdom

  • United Kingdom

  • 477 Citations
  • 9 h-Index

Research output per year

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Personal profile

Research interests

I am leader of the research theme 'Environment, Economy, and Society' at the Environmental Research Institue (ERI) based at North Highland College in Thurso. The research theme aims to understand the, often complex, impacts of industrial developments and environmental interventions considering all aspects of sustainability, with a focus on issues affecting rural, coastal and island areas and communities.

I originally trained as a Mechanical Engineer but spent my PhD working on the Anaerobic Digestion (AD) process for biogas production and organic waste management. In the subsequent 10 years as a researcher I continued to specialise in AD, but my work broadened to cover the development of a range of other environmental and energy technologies and their integration. 

I apply process engineering tools in order to design, optimise and inform the implementation of these systems, and develop coupled models to understand their economic and environmental impacts.

Research expertise


Process modelling including biochemical, chemical and pyhisical models. 

Design, integration and optimisation of multivector energy systems

Technoeconomic assessment 

Model parameter estimation

Life-cycle assessment


Anaerobic digestion and biogas systems

Organic waste management

Bioenergy and biofuels

Integrated renewable energy systems

Biorefineries and biobased products


Algal cultivation


Education/Academic qualification

Doctor of Engineering

Award Date: 1 Jan 2010

Master of Engineering, Durham University, England

Award Date: 1 Jul 2004

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Research Output

  • 477 Citations
  • 9 h-Index
  • 12 Article
  • 2 Conference contribution
  • 1 Chapter
  • 5 Citations (Scopus)

    Food Waste Management, Treatment and Disposal Options

    Hoornweg, D., Lougheed, S., Walker, M., Salemdeeb, R., Soma, T. & Reynolds, C., Jan 2020, Routledge Handbook of Food Waste. Reynolds, C., Soma, T., Spring, C. & Lazell, J. (eds.). Routledge, 12 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

  • Assessment of micro-scale anaerobic digestion for management of urban organic waste: A case study in London, UK

    Walker, M., Theaker, H., Yaman, R., Poggio, D., Nimmo, W., Bywater, A., Blanch, G. & Pourkashanian, M., Mar 2017, In : Waste Management. 61, p. 258-268 11 p.

    Research output: Contribution to journalArticle

    Open Access
    15 Citations (Scopus)
    4 Downloads (Pure)

    Assessment and parameter identification of simplified models to describe the kinetics of semi-continuous biomethane production from anaerobic digestion of green and food waste

    Owhondah, R. O., Walker, M., Ma, L., Nimmo, B., Ingham, D. B., Poggio, D. & Pourkashanian, M., 9 Mar 2016, In : Bioprocess and Biosystems Engineering. 39, 6, p. 977-992 16 p.

    Research output: Contribution to journalArticle

    Open Access
  • 6 Citations (Scopus)
    1 Downloads (Pure)

    Modelling the anaerobic digestion of solid organic waste -Substrate characterisation method for ADM1 using a combined biochemical and kinetic parameter estimation approach

    Poggio, D., Walker, M., Nimmo, W., Ma, L. & Pourkashanian, M., Jul 2016, In : Waste Management. 53, p. 40-54 15 p.

    Research output: Contribution to journalArticle

    Open Access
  • 26 Citations (Scopus)
    5 Downloads (Pure)