HTC, part of the Aquam group, has succeeded in unblocking a thickened sludge main at Yorkshire Water’s Esholt wastewater treatment works. Traditional rodding and jetting techniques had already been tried on the 150mm-diameter main which carries 6% dry solids sludge from drum thickeners into a sludge holding tank. Aquam’s Whirlwind™ pipe cleaning system uses an air vortex to clear pipes, or without aggregate depending on the application. On

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