Twence B.V. services

When drivers arrive at the Twence Afvalscheiding (TAS) facilities with a load of waste to be sorted, they dump it onto a flat expanse of concrete. There, a TAS employee checks the waste material to see whether or not it can be processed.

Twence not only generates a great amount of energy from waste, but we also recover a lot of metals from that waste, both ferrous and non-ferrous. In 2010, we managed to recycle 12,918 tonnes of ferrous and 1,676 tonnes of non-ferrous metals. Following the combustion process in our Waste-to-Energy Plant, we recover the metals in the Slag-reprocessing Unit. That is where the ash and the cinders or slag that remain after combustion are sifted and made fine. We use magnets to remove any ferrous metals from the combustion residues.

Incinerating waste creates flue gasses. These always contain various chemical substances – in the form of gasses or fine particles – in higher concentrations than are good for the environment. To prevent those from being released into the environment, the flue gasses are cleansed before they leave the chimney. This occurs by means of a so-called flue-gas purification system. At Twence, that system takes up about half the space in the waste-to-energy (WTE) incineration plant. The flue-gas purification system is made up of a number of components.