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I settled for 'waste disposal contractors' in the end, thanks to the excellent Internet site Elisabeth provided as a reference. Thanks to the other contributors for clarifying this term for me. 4 KudoZ points were awarded for this answer
-> "This project is specifically aimed at using an innovative design of rotary kiln to provide a solution to two modem day dilemmas which confront both disposers of waste & users of natural aggregate for the production of concrete" [ the text continues about the processing of domestic & industrial wastes ] http://www.dit.ie/eng/csee/research/rotary.html
I hope this helps somewhat Jarry. I have to admit, though, that it's not really my field...