Features and benefits
Dual-shafted grinder

  • Dual-shafted, slow-speed, high-torque grinder easily shreds the toughest debris, including rocks, wood, wipes, hair, clothing, plastic and other debris
  • Capable of grinding a wider variety of solids than single-shafted machines, macerators, or chopper pumps
  • Grinding separates organic from inorganic materials in the waste stream
Automated monitoring and controls

  • Protect pumps and other critical equipment from costly clogs and damage from tough solids
  • Auto load sensing and reversals reduce interrupts and optimize performance
Wipes Ready™ technology

  • Wipes Ready Technology available which prevents materials from forming long strips and reweaving in the waste stream
Compact and efficient design

  • Adapts to pipelines or channels with little or no modification
  • Custom stainless-steel frames allow easy installation in channels, wet wells and pump stations
  • Inline 30K Muffin Monster™ offers easy removable cartridge maintenance that allows for overhaul without removing the unit from the pipeline

Lower operating cost

  • Clear pipes and pumps means shorter pump run cycles and lower electrical costs
Main applications

The Muffin Monster™ sewage grinders are designed to protect pumps and other equipment by grinding down the toughest wastewater solids. Available in three different models each with two different configurations, they are suitable for applications such as:

  • Pump stations
  • Sludge processing    
  • Correctional facilities
  • Headworks – primary treatment
  • Septage/Grease receiving
  • Airports
Muffin Monster™ 10K series

The 10K Series Muffin Monster is a compact grinder, tough on solids in sludge and sewage applications. It fits into areas with limited space requirements while still providing the necessary power for downstream protection. The 10K Series is an ideal, low-cost solution that goes beyond sludge grinding at resource recovery facilities. It fits perfectly into office buildings, apartment complexes, resorts, retails centers and package treatment plants.

  • Hex shafts: 50 mm
  • Motor: Standard 1.5 kW; 25:1 reducer
  • Cutter size: 120 mm diameter
  • Seal max working pressure: 6 bar

Inline model

Inline model

Flow rate (1) m3/hr

Pipeline size mm Pressure drop bar
10000-B100-DI 62 100 0.03
10000-B150-DI 125 150 0.09
(1) 0-2% solids

Open channel model

Open channel model Flow rate (2) m3/hr Head drop mm
10002-0008-DI 41.4


(2) Flow based on optimum channel conditions.
Muffin Monster™ 30K series

Troublesome solids are now easier than ever to reduce with the Muffin Monster dual-shafted grinder. Its slow speed, high-torque design shreds tough solids that typically cause sewer problems. The 30K Muffin Monster is available as both inline and open channel configurations.

  • Hex shafts: 50 mm
  • Motor: Standard 2.2 kW; 25:1 reducer
  • Cutter size: 120 mm diameter
  • Seal max working pressure: 10.3 bar

Inline model

Inline model Flow rate m3/hr Pipeline size mm Pressure drop bar
30004T-B100 102 100 0.04
30004T-B150 159 150 0.08
30004T-B200 250 200 0.21
30004T-B250 386 250 0.20
30004T-B300 556 300


Open channel model

Open channel model Flow rate (1) m3/h Head drop mm
30005-0012 141 290
30005-0018 223 405
30005-0024 311


30005-0032 477 445
30005-0040 686 495


(1) Flow based on optimum channel conditions.
Muffin Monster™ 40K series

The 40K Series Muffin Monster excels in wet and dry grinding applications. It is a powerful shredder for large processing systems. It also serves in many industrial applications including fish and beef processing, petroleum, pulp and paper mills, chemical plants, and recycling plants.

  • Hex shafts: 64 mm
  • Motor: Standard 7.5 kW; 35:1 reducer
  • Cutter size: 190 mm diameter
  • Seal max working pressure: 10.3 bar

Inline model

Inline model Flow rate m3/hr Pipeline size mm Pressure drop bar


300 0.24
40002-24B400 999 400 0.15
40002-24B450 1249 450


40002-32B500 1558 500 0.29

Open channel model

Open channel model Flow rate (1) m3/hr Head drop bar
40002-0018 207


40002-0024 327


40002-0032 477 457
(1) Flow based on optimum channel conditions.


7,11,13 and 17* tooth options

* Wipes Ready™ serrated cutters



  • IP55 TEFC Motor, standard
  • IP55 TEFC Motor for ATEX: (Ex d IIC T4), optional
  • IP68 Immersible Motor ATEX: (Ex de IIB T4), optional
  • IP55 Integrated drive, 10K only

Smart controller

Smart controller

  • Load-sensing control system automatically reverses to clear jams

Custom frames

  • Stainless steel frames for easy installation
Wipes Ready™ feature availability

10K in-line

Muffin Monster

10K open channel

Muffin Monster

30004T in-line

Muffin Monster

30005 open channel

Muffin Monster

17 tooth Wipes Ready cutters*


Optional Optional Optional
Delta P side rails* Yes
Optimized cut control* Yes Yes Yes Yes
* Patent pending
Wipes Ready™ Technology

Muffin Monster sewage grinders are available with the unique Wipes Ready™ suite of technologies. It is designed to capture all wipes in the waste stream and shred them into small pieces that will not reweave into a ragball in sewage systems.

The Wipes Ready technologies applied in Muffin Monster sewage grinders are:

  • Wipes Ready cutters* – A combination of serrated cutters and knurled spacers cuts wipes in two directions. The result is smaller particles that cannot reweave downstream.
  • Delta P side rails* – Direct solids into the cutters without sacrificing flow rate and prevent debris build-up in the grinder
  • Optimized cut control (OCC)* – The OCC gear ratio optimizes shaft speeds to enhance the cutting action and cleaning of the cutters, which in turn improves the performance and life of the grinder.

Please note that different Muffin Monster models feature different Wipes Ready options.

* Patent pending


Case studies and articles
  • Warding off hygiene challenges
    Blocked wastewater systems are a perennial challenge for hospitals around the world. To keep these critical systems running, leading healthcare facilities are turning to Sulzer Muffin Monster™ grinders as an effective first line of defense.

  • 30K Muffin Monster™ in lift station
    Villa Mountain Vista North in Las Vegas installed a 30K Muffin Monster™ to get rid of clogging in their onsite lift station.

  • 30K Muffin Monster™ for biogas facility
    Learn how the powerful 30K Muffin Monster™ greatly reduces material clogging and downtime at a biogas facility in Catalonia, Spain.

  • 40K Muffin Monster™ in septage hauler
    Port-a-Loo, New Zealand’s largest septage hauler, invested in a 40K Muffin Monster™ to eliminate frequent clogging of wastewater pumps at the disposal site.

  • 10K Muffin Monster™ for water reclamation plant
    Learn how the 10K Muffin Monsters™ help Schertz water reclamation plant in Texas, USA, grind the toughest solids more reliably with less energy.

  • Muffin Monster prevents sewage pumps from clogging
    January 16, 2020
    Sewage system operators deal with problematic waste such as wet wipes, disposable wipes and other solids flushed down toilets. They spend a lot of resources cleaning their pumps of unwanted solids in the sewage. Our Muffin Monster range, very powerful grinders, break these solids down and prevent pumps from clogging.

  • Case studies
    Wherever fluids are pumped, mixed, controlled or applied, we are there. See how our solutions create value for customers and learn how we can make your pumping and mixing processes more efficient and profitable, safeguarding your production and ensuring lasting reliability.

Data sheets

Case studies


  • Anaerobic digestion
    Anaerobic digestion requires temperature equalization and proper homogenization of the biomass to achieve a high gas production and to avoid sedimentation of organic matters. The surface crusts must be broken and prevention of foam must be managed if there are foaming tendencies. Sulzer can provide efficient and reliable Scaba agitators for digesters with high-efficiency propellers. Muffin Monster™ grinders upstream from the anaerobic digesters condition the sludge before digestion, improving the homogenization of the biomass and protecting the equipment downstream.

  • Network pumping station
    Network pumping stations collect municipal wastewater from residential homes and communal schemes. Installed in dry or wet wells, the pumps deliver the effluent to a terminal pumping station. Since most pumping stations are not equipped with screens, the pumps must cope with difficult materials such as fibrous sanitary and packaging items.

  • Sludge buffer tank
    The sludge buffer tank can be used for a variety of purposes. The most common application is the blending and homogenization of highly concentrated primary, secondary or digested sludge. The solution used to mix the sludge itself, or to mix the sludge with the dosed thickening chemicals, depends on the design and volume of the sludge buffer tank. Submersible mixer types ABS XRW and RW, as well as the agitator type Scaba, can be used to provide highly efficient mixing. Positive displacement, progressing cavity transfer pumps and Muffin Monster™ grinders are used for solids reduction and sludge transfer from sludge feed to sludge dewatering process.

  • Sludge handling and transfer
    Sulzer pumps, mixers, grinders and agitators are used to condition, transfer, blend and handle sludge. Our progressing cavity, positive displacement pump range, provide a near constant flow rate with suction lift capability, for handling all types of non-Newtonian sludge and cake processes, typically demanded within the wastewater treatment plant. Maintain in place features ensure any process downtime due to the change out of wear components is kept to a minimum. The Muffin Monster™ grinders protect the equipment downstream. The sludge conditioned by grinders will not clog valves, heat exchangers, digesters, centrifuges and other equipment on the sludge line.

  • Terminal pumping station
    Terminal pumping stations receive municipal wastewater from network pumping stations. Installed in dry or wet wells, the pumps forward the medium to a treatment plant for final purification. Due to the lack of screens at most pumping stations, difficult materials such as fibrous sanitary and packaging items are a constant threat to uptime.
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