Low emission biogas also produces fertilizer

By Jim Drury, Reuters.

A Canadian chemical engineer has devised a product that transforms the waste generated by biogas production into fertilizer. Andrew White says his SulfaCHAR system eliminates chemical waste from the biogas process, while increasing renewable gas plants' profitability and stopping the degradation to gas engines caused by hydrogen sulfide (H2S).

Biogas can help create electricity or be used as a replacement for natural gas and is often cited as a clean and carbon-neutral alternative to fossil fuels. Yet the decomposition process generates carbon dioxide and other dangerous, unpleasant smelling gases, causing an annual global clean-up bill of $1.2 billion USD.