Resource recovery from waste streams
I am interested in developing innovative biorefinery concepts that enable the production of high-value chemical compounds from diverse waste biomass streams, including sewage, agricultural residues, and meat-processing by-products. My previous research has focused on utilizing biomass as a sustainable feedstock for second-generation biodiesel production, employing novel strategies to address challenges posed by moisture content and high free fatty acid levels. In addition, I have investigated approaches for optimizing biogas generation from waste residues and applied hydrothermal liquefaction to convert biomass into biochar and biocrude.
Figure 1: A simple hydrothermal liquefaction reactor set-up.
I have explored the potential for enhanced value recovery from waste plastics through the application of thermochemical conversion technologies. In particular, I experimentally investigated hydrothermal liquefaction as a promising approach to maximize value extraction, following the process steps outlined in Fig. 2.
Figure 2: Value extraction from waste plastics.
Some of the interesting results obtained in this preliminary work include;
- The resulting waxy oil product was shown to present a higher heating value (HHV) of 47.9 MJ/kg, similar to the HHV of petroleum crude of 47 MJ/kg.
- Additionally the waxy oil product was shown to contain significant concentrations of useful n-alkanes as highlighted in Figure 3A&3B
3A
3B
Figure 3: NMR analysis (3A) and GC-MS analysis (3B) of the waxy-oil product.
Further work is still being undertaken in this area.
Furthermore, I have a strong interest in the experimental optimization of conversion processes. A selection of my recent conference presentations, seminars, and book chapters in this area is listed below. For a more exhaustive view of my work in the area feel free to check my publications;
May 2019 OERC Seminar Series.pdf
Lipase for biofuel production.pdf
Thermal depolymerisation of digestate for biofuel and biomaterial production.pdf
