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Mono Munchers proving effective at US wastewater plant

The Mono Muncher is a twin-shaft, slow-speed, high-torque grinder designed as a solution for the maceration of sludges and solids within a flow.
The Mono Muncher is a twin-shaft, slow-speed, high-torque grinder designed as a solution for the maceration of sludges and solids within a flow.

A pair of Series ‘A’ Munchers from NOV Mono have helped reduce maintenance intervals and improve capacity at a major wastewater treatment plant in Massachusetts, USA.

The construction of the Mono units - and their ability to handle up to 11 million gallons per day (MGD) - has also helped reduce the risk of overflows during storm periods.

Operated by the Lynn Waste Water Treatment Plant, the Humphrey Street facility had previously been using a single large grinder unit to process wastewater. However the unit’s 50” tall cutter stack and single 10” diameter drum were struggling to cope with the excessively high flows experienced during intense rain storms, and the cost of replacing it with a similar alternative was prohibitive.

The two Mono CA215 units were selected as a replacement solution. The facility receives roughly 2 MGD of inflow, but the Mono units can accommodate 5.5 MGD each, giving a combined total of 11 MGD. Combined with an initial filter installed upstream to limit any extreme flow, this virtually eliminates any risk of overflow, even during major storms. The Mono units have also been built on 6ft extended shafts, and fitted with extra-high sides to mitigate the risk of the flow going over the top of the inlet channel.

Both Mono units are located in the channel, and during normal flow levels they are used alternately, on a monthly basis. This greatly extends the intervals between repairs, and always allows one unit to be in operation while the other is being maintained.

The Mono Muncher is a twin-shaft, slow-speed, high-torque grinder designed as a solution for the maceration of sludges and solids within a flow.  Their twin shafts have a series of interleaved cutters and spacers which create a powerful ‘positive displacement' grinding action.  Once solids are trapped in the slowly revolving cutters, the differential speed of the cutter stacks pulls apart fibrous material, crops and shears plastic and crushes brittle materials, while the low cutter tip speeds reduce wear rates by minimising any impact loading.

Suitable for either pipeline or channel installations, the Series 'A' Muncher eliminates the need for manual handling of screening debris and the associated transport costs.  It can be installed into an existing concrete channel or in a fabricated frame, complete with guide rails, into an existing submersible pump station as a simple and quick retrofit.

The Munchers are ideal for high volume grinding applications, and offer rugged and reliable protection for pumps and other downstream process equipment. They are supplied with a programmable logic controller (PLC) to protect the machine against damage and overloads.  An optional Profibus data capture system is available to record operational information.

The Mono Muncher is a twin-shaft, slow-speed, high-torque grinder designed as a solution for the maceration of sludges and solids within a flow.