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Muhammad Farooq

Muhammad Farooq

Heriot-Watt University

Title: Upgrading of bio-gas into bio-methane by regenerative activated carbon system


Biography: Muhammad Farooq


Anaerobic digestion (AD) industry in the UK has experienced rapid growth in recent years over 130 operational AD plants in the UK outside the sewage treatment sector and more than 340 further projects are under development. Thus, there is an increasing demand for upgraded biogas to be used as vehicle fuel or injected to the natural gas grid. Since a typical biogas contains 1000 - 10,000 ppm hydrogen sulphide, its removal below 5ppm is required for uses beyond combined heat and power (CHP). Although a number of established methods exist for removal of hydrogen sulphide they tend to be costly for an average sized AD facility. A common industrial alternative to large-scale water-scrubbing is to adsorb hydrogen sulphide using a granular activated carbon (GAC) bed which is subsequently disposed as hazard waste. Accordingly, this research will focus on regeneration of activated carbon using an electric potential. The driving force is a high capacity system that is regenerative, inexpensive and leaves no waste. A 1% hydrogen sulphide / 99% nitrogen gas mixture is used as a benchmarked against an industrial activated carbon specifically used for hydrogen sulphide removal. Several Electric Conductive Activated Carbons (ECAC) will then be reported for their adsorption/ desorption potential. It is envisioned that this method can transform the production of bio-methane where early estimates have calculated that a regenerative system could save up to 50% of running costs.

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