It is a grey day in a wet week but one of Thames Water’s neglected plants is still coping. Wastewater is being pumped into the vast Maple Lodge sewage treatment centre in Rickmansworth, just off the M25, at a rate of about 3,000 litres a second, within capacity.
The site manager points out the first-line screens that catch everything that will not pass through a 5mm filter. A “sheep” – a bundle of wet wipes, sanitary pads, cotton buds, condoms and indigestible bits of sweetcorn – is rotating at one edge. Credit cards and false teeth have been known to end up here.
