The technology developed and deployed by Muradel is innovative and provides a novel pathway for production of renewable biofuel; a pathway that does not compete with agriculture for nutrients or water and does not involve land-use change.
The Green2Black™ technology platform used for processing sludge consists of three main continuously operated processes: pre-treatment (thickening), conversion (hydrothermal liquefaction), and post-treatment (fractionation and extraction). Pre-treatment uniforms particle size (in the case of biosolids) providing a slurry of ~30% w/w solids. The conversion process takes place in a sub-critical water reactor operating at ~350oC and ~200bar, where hydrothermal liquefaction of the organic content occurs producing hydrocarbons. The resultant reactor product is termed kerogen, which is a combination of hydrocarbons, inorganics (particulate and soluble), water and CO2. Fractionation of the products occurs in the post-treatment processes, producing biocrude oil, fertilizers, pure CO2, lightweight aggregates and water. Typically 60% of the organic fraction is converted into biocrude oil. The biocrude oil is chemically identical to fossil crude oil. A dry weight tonne of sludge at ~80% w/w organic mass will convert into ~3 barrels of renewable biocrude oil, with an energy content of ~30MJ/kg.
The suite of patents associated with the Green2BlackTM technology provides surety that the technology has the potential to be licensed nationally and internationally in urban, rural and remote locations.