PSD Removes Mud from 20km-long Tunnel [7 December 2000] PSD (Pigott Shaft Drilling Limited) have recently completed work with Delta Civil Engineering Limited on the Blackdyke to Kennett Tunnel near Newmarket for the Environment Agency. The project involved the removal of silts & vegetation from a water transfer tunnel & associated shafts, repairs to concrete tunnel lining & installation of monitoring equipment along 19.8km of 2.54m diameter tunnel at depths of between 30m & 78m.
High capacity centrifuges from PSD have a wide range of applications including soil washing, treatment of slurry from tunnelling and diaphragm walling projects, canal, dock and reservoir cleaning and the treatment of site run-off water. PSD's S4DP centrifuges are the largest throughput, containerised centrifuges in Europe and can be used for the removal of fine solids or for the removal of flocculated solids from process fluid to reduce the volume and cost of off-site disposal. PSD is the leading specialist onshore mud cleaning and solids separation equipment rental company in the UK. They operate an extensive range of high performance equipment, which is rented with or without operators on a worldwide basis and offer an extensive range of polymers and mud products. The company is renowned for high quality mud cleaning and specialises in 'dry discharge' solids separation with flowrates of 10 to 1200m3/hr. PSD's hire fleet includes clayball separators, primary shakers, desanders, desilters, ultra-fine desilters, mud cleaners, hydrocyclone units, centrifuges, flocculation plants, mud mixers and mud storage tanks.
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PSD supplied on rental to Delta a high capacity S4DP centrifuge, flocculation system, sedimentation tank & operator. Operating on a 24-hour basis, wash water from the tunnel was pumped to the PSD plant for flocculant dosing and removal of flocculated solids. The resultant clear fluid was discharged to the nearby Kennett Brook, a water-course monitored by the Environment Agency, and the separated solids were removed from site for disposal.