A wide variety of sludge, including municipal sewage sludge is treated in anaerobic digesters. In these digesters, there is a certain amount of biogas created and this consists of CH₄, CO₂ and H₂S.This biogas is often used for creating green energy.

For reasons related to health, safety and corrosion, removal of H₂S is often desired. HydroThane can offer a range of biogas desulphurization processes and can advise customers in this way – the best and most economic method for H₂S removal.

Reliability, efficiency, availability and operational/capital investment are some of the criteria which are taken into account for every case. The clean biogas can be used to produce electricity or to replace natural gas in a boiler.

Sludge rejection water from municipal waste water treatment plants can be treated with the HydroThane STP^® HYDRAMMOX process.

The HYDRAMMOX process is a single stage system in which nitridation (NO₂ formation) and the anammox reaction occurs simultaneously.

This so-called removal of ammonium over nitrite (NO₂-) has several advantages compared to conventional biological nitrogen removal using nitrification and denitrification.