Sitting in a coffee shop contemplating a challenge, set by The Bartlett School of Architecture at UCL, to design a coffee shop and roastery, Arthur realised that spent coffee grounds were being wasted everywhere. Inspired by that idea he set up Bio-bean with Benjamin Harriman to recycle waste coffee grounds into advanced biofuels. His idea won awards and support from the Mayor of London, UCL, Tata, Santander and Shell. Bio-bean became part of the Ellen MacArthur Foundation CE100 and their products were exhibited at The Science Museum. The company has also been awarded funding from Innovate UK.
Bio-bean's products are second-generation biofuels. The biomass pellets are made from waste coffee grounds which are burned in biomass boilers as a sustainable, local renewable heat alternative. Bio-bean also produces Bio-bean Logs and barbecue charcoal from waste coffee grounds.
Bio-bean also conducts extensive research and development into biodiesel, biochemicals and further uses for waste coffee grounds and other organic waste streams.
Arthur is now a visiting lecturer at Imperial College, the entrepreneur in residence and visiting lecturer at UCL.

In 2018 he became the founder and CEO of Skyroom, an award-winning urban development company providing key urban workers with high-quality, low-cost, eco-friendly homes, near where they work, so that they have the opportunity to thrive in the cities they support.