English: waste incineration plant 
Welsh: peiriant llosgi gwastraff
Subject: Amgylchedd
English definition: "Waste incineration plant” means a stationary or mobile technical unit and equipment dedicated to the thermal treatment of waste, with or without recovery of the combustion heat generated, through the incineration by oxidation of waste as well as other thermal treatment processes, such as pyrolysis, gasification or plasma process, if the substances resulting from the treatment are subsequently incinerated.