Without adequate control, employees may be exposed to high levels of noise during glass collection activities etc and risk damage to their hearing.
The Control of Noise at Work Regulations 2005 stepped hierarchy states that:
HSE, manufacturers and users have been working to develop technical solutions to the problem of noise in glass collection. In many cases, noise-dampening materials have been capable of reducing noise emissions by up to a half (around 3 dB). However, they do not reduce noise emissions to levels where hearing will not be damaged, without additional action being taken.
For further guidance see:
Trommels, separation magnets, eddy current separators and moving vehicles can all contribute to noise levels and damage hearing. This is why many MRFs use picking cabins which can isolate noise and protect workers from unnecessary exposure to noise (and dust).