In addition to the produced synthesis gas, which is commercially used as an energy carrier, remaining inorganic, inert glazed materials (not coke) are produced as the residue of gasification. The resulting ash and slag is practically inert (ignition loss < 1.0%). Heavy metals are bound chemically within the slag. These may be used commercially or as a recycled material depending on the ingredients (e.g. copper). In the worst case, these materials can be introduced into the simplest classes of landfills without any danger to the environment.
The BASURAgas® Universal System achieves measured values that fall significantly below 10% of the legal limit of the 17th Ordinance of the Federal Emission Control Act (17. Bundes-Immissionsschutz-Verordnung Germany); The 17th Ordinance of the Federal Emission Control Act sets out the strictest requirements in the world in regards to the cleanness of emissions from waste treatment standards. For polycyclic hydrocarbon compounds the result is even better – ProCone achieves measured values which are below 1% of the legal limit!
The 17th Ordinance of the Federal Emission Control Act requires treatment of the flue gases at a minimum of 850°C for at least 2 seconds in the case of municipal waste and a minimum of 1,100°C likewise for at least 2 seconds in the case of special waste (especially waste which must be compulsory monitored).
For the BASURAgas® Universal System case, the gases are continuously thermally converted in a high temperature combustion chamber at 1,200°C with a retention time of over 2 seconds. This satisfies the legal requirements for both municipal waste and special waste. Since this combustion chamber can also be fired with fossil fuels, this required temperature can also be permanently maintained even for widely fluctuating gas heating values.
Plant minimum emission requirements:
Plant wastewater requirements
To ensure water hygiene levels, the local, regional and federal wastewater regulations and directives are to be adhered to for all condensate and wash water from the gas-cleaning and wastewater treatment modules of such plants. In addition, the specific threshold levels for wastewater discharge into the sewerage network must be ascertained from the local wastewater authorities and adhered to.
Further waste products from the plant
Due to the relatively straightforward nature of the plant and technologies employed, further waste products are not expected. In particular, as a result of the multiple treatments of vapours and steams with temperatures in excess of 1,000 °C, no odorous emissions are to be expected.
Local area noise emission levels
As the plant size is relatively compact and operates practically noise-free, an appreciable level of noise emission is not to be expected. The noisiest components of the plant are the freestanding shredder modules. The noise emissions from such shredders do not, however, exceed typical noise levels in commercial or industrial environments. If such a plant is to be located within a residential area, such shredder modules will be housed within appropriate buildings so that the reduced noise emission levels is below the statutory levels allowed in such areas.
Traffic and transport to and from the plant
The concept of a decentralized feedstock materials processing system aims to process such materials as near as possible to where the materials originates, i.e. to avoid the need for economically intensive transport logistics and traffic load. This leads to a substantial reduction in traffic and transport emissions as such feedstock materials are processed only that originate from the immediate vicinity of the plant.