HTC: Key technology in Biomass waste treatment

Hydrothermal carbonization is the physiochemical process by which organic waste materialis converted into HTC biocoal and process water in a wet procedure at about 230 degrees temperature and 25 bar pressure within several hours. Hydrothermal carbonization is the industrial reproduction of the natural process by which biomass has been converted into fossil coal for millions of years. In this paper and in the presentation of Alfons Kuhles is the procedure of “Hydrothermal carbonization” explained, the GRENOL continuously operating HTC reactor, the mass energy balance of the GRENOL HTC procedure, usages and benefits of Hydrothermal carbonization as compared to the more established procedures of combustion, fermentation and anaerobe conversion (e.g. biogas production). In sum, HTC offers a new alternative procedure to process organic waste in an environmentally friendly manner, and to close the cycle of waste Management.

Hydrothermal Carbonization is the procedure by which organic waste of all sort is converted into carbon and water at a temperature of about 230 degrees temperature and apressure of about 25 bar in a wet procedure in a closed system. Contrary to other processes of converting biomass on the market, HTC is a physio-chemical, not a biological process of biomass processing in waste management. Under these conditions, an exotherm reaction takes place. Heat is produced during the splitting of carbohydrate chainsfrom the original biomass. Hydrothermal carbonization is an industrial variation of the natural process of coalification by which organic residues have been converted to fossil brown and black coal as a result of heat and pressure for millions of years; the same process that we know from nature takes now place at much higher speed. Consequently, the original biomass is converted into biocoal and process water within 3 to 12hours. Contrary to other procedures such as combustion, fermentation and anaerobe conversion (e.g. conventional biogas production), “Hydrothermal carbonization” has acarbon and energy energy balance that is far superior to other procedures of organic waste management, such as alcoholic fermentation, anaerobe conversion or combustion. In “Hydrothermal carbonization”, near to 100 per cent of the carbon and two thirds of the energy are conserved. One third of the energy contained in the original biomass is turned into exothermal energy and thus fed back into the system. Contrary to the other procedures, no carbon dioxide (CO2) or methane (CH4) is discharged into the atmosphere.



Copyright: © Wasteconsult International
Quelle: Waste-to-Resources 2015 (Mai 2015)
Seiten: 9
Preis inkl. MwSt.: € 4,50
Autor: Dipl. agrar ing. Alfons Kuhles

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