Biological elimination of a high concentration of hydrogen sulfide from landfill biogas.

Hydrogen sulfide (HS) is one of the main contaminants found in biogas, which is one of the end products of the anaerobic biodegradation of proteins and other sulfur-containing compounds in solid waste. The presence of HS is one of the factors limiting the valorization of biogas. To valorize biogas, HS must be removed.

Key variables analysis of a novel continuous biodrying process for drying mixed sludge.

A novel continuous biodrying process has been developed whose goal is to increase the dry solids content of the sludge to economic levels rendering it suitable for a safe and economic combustion operation in a biomass boiler. The sludge drying rates are enhanced by the metabolic bioheat produced in the matrix of mixed sludge. The goal of this study was to systematically analyze the continuous biodrying reactor.