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Mono 'Muncher' minimises ragging for United Utilities

04 May 2011

The TR Muncher from NOV Mono has increased process efficiency at United Utilities' Warrington North (Gatewarth) wastewater treatment works, preventing pump blockages and minimising down time. The site had experienced problems with two of its Flygt pumps which were regularly blocking due to high rag content. The TR Muncher, which macerates heavy solids and rags to a small particle size, provided the ideal solution to this problem; but to ensure that the two units could be incorporated into existing pipework at the base of the 4m deep well, Mono decided to move forwards the two Flygt pumps and fabricate new discharge pipework for the installation. The company also replaced old gate valves with new, slimmer, knife valves in order to isolate the sludge flow for pump maintenance.

The TR Muncher, which has a capacity range of 0-500m3/h raw sewage, features the latest generation of twin shaft grinders and is designed specifically for the efficient treatment of abrasive sludges. The differential speed of the cutter stacks pulls apart fibrous material, whilst the leading edge and sides of the cutter teeth crop and shear other materials, such as plastic, into small pieces. The circumferential 'land' of the cutter crushes friable or brittle material and the pull back cutter stack allows removal without disturbing the pipeline
The layback cutter shafts on the TR Muncher are set at an angle to the incoming flow, allowing it to capture irregular shaped objects and, if a reverse cycle occurs, the object is automatically dropped into a built-in trash trap, which is set clear of, and below, the cutter stacks. A trash flap is fitted with a large diameter access port to enable easy removal, cleaning and flushing.

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