Main benefits
  • Protect pumps and other critical equipment from costly clogs and damage from tough solids
  • Wipes Ready™ cutters prevent materials from forming long strips and reweaving in the waste stream
  • No labor needed to clean, disassemble and reassemble the repair unit, or wait months for parts. Just swap and go!
  • Delta P side rails ensure solids are processed by the dual-shafted grinder while optimizing flow through the unit
  • Lower operating costs by keeping pumps and other equipment running efficiently
Main applications
  • Sewage pump stations
  • Headworks – primary treatment
  • Sludge processing
  • Anaerobic digestion / Bioresource
  • Septage / Grease receiving
  • Correctional facilities
  • Airports
  • Facilities management
Key features
  • Dual-shafted, high-torque grinders handle rags, rocks, woods, wipes, clothing, plastics and other debris
  • Wipes Ready™ cutters create two-dimensional cutting capabilities to control width and length of output
  • In-line 30K Muffin Monster includes an easy-to-remove cutter cartridge
  • Patented Delta P side rails drive debris into the cutters
  • Grinders reduce solids to a size that pumps and other equipment can process efficiently and safely
  • Housings: ductile iron
  • Cutters: hardened alloy steel
  • Shafts: hardened alloy steel
  • Mechanical seals: tungsten carbide faces
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, 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, retail 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 (optional severe-duty seals available)

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 dry working pressure: 10.3 bar

Inline model

Inline model Flow rate (1) 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


(1) 0-2% solids

Open channel model

Open channel model Flow rate (2) m3/hr Head drop mm
30005-0008 84 178
30005-0012 141 290
30005-0018 223 405
30005-0024 311


30005-0032 477 445
30005-0040 686 495
30005-0050 979 595


(2) 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: 191 mm diameter
  • Seal max dry working pressure: 10.3 bar

Inline model

Inline model Flow rate (1) m3/hr Pipeline size mm Pressure drop bar


300 0.24
40002-24B400 999 400 0.15
40002-24B450 1'249 450


40002-32B500 1'558 500 0.29
(1) 0-2% solids

Open channel model

Open channel model Flow rate (2) m3/hr Head drop bar
40002-0018 207


40002-0024 327


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


  • 7,11,13 and 17* tooth options
    * Wipes Ready™ serrated cutters
  • Cutter stack can be tailored to meet operational requirements
  • Available in optional stainless steel for 7, 11 and 13 tooth 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
  • Extended drive shafts available

Grinder smart controller
Representative panel shown. Actual panel may vary to meet application requirements.

Smart controller

  • Load-sensing control system automatically reverses to clear jams
  • Powder-coated mild steel or stainless steel IP65 enclosures

Custom frames

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

10000 inline

Muffin Monster

10002 open channel

Muffin Monster

30004T inline

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

Wipes Ready Technology

Muffin Monster sewage grinders are available with the unique, Wipes Ready technology. It is designed to capture all wipes in the waste stream and shred them into small pieces that will not reweave to form ropes and ragballs in sewage systems.

The Wipes Ready technology applied in Muffin Monster sewage grinders includes:

  • 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.

Case studies and articles
  • Mastering the daily grind
    Textiles and other unconventional debris can be a tough problem for pumped wastewater systems. That’s why more and more operators are addressing the problem at source with Sulzer’s Muffin Monster™ grinder technology.

  • Monster keeps major infrastructure project on track
    A Sulzer Channel Monster has been a lifeline for a large-scale wastewater treatment project in Vác, Hungary

  • Sulzer solves motorway jams
    Drivers rely on motorway rest areas and service facilities to ensure their comfort and safety on long journeys. However, for Austrian operator ASFiNAG, heavy use of these facilities was leading to maintenance headaches. Now, thanks to Sulzer’s Muffin Monster™ grinder and Piranha pump technology, wastewater pump blockages are becoming a thing of the past.

  • Monster makes quick work of debris
    Municipal utility company Servicebetrieb ASK in Nordrhein-Westfalen was experiencing frequent blockages and outages in one of its sewage pumping systems. The main cause was the proportion of solids in the wastewater. Sulzer recommended the upstream installation of a dual-shafted grinder, known as the Muffin Monster™ and since its installation, the sewage pumps have been operating perfectly.

  • 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.

  • Optimizing the performance of sludge treatment and anaerobic digestion plants
    Large wastewater treatment facilities often incorporate an anaerobic digestion (AD) plant to handle sludge and deliver heat as well as electrical energy to support the operation of the site. Process performance depends on equipment reliability and getting the most out of the feedstock. Improved efficiency enables plants to increase throughput without expanding the site and this can be achieved by optimizing the sludge handling equipment.

  • 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.

  • Preventing sewage pumps from clogging
    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.

  • Deutliche Kostenersparnis durch Muffin Monster™ Doppelwellenzerkleinerer (DE)
    Der Austausch von Rechenanlagen durch Muffin Monster Doppelwellenzerkleinerer in Pumpstationen führte zu einem störungsfreien und damit deutlich personal-, wartungs- und kostengünstigeren Betrieb. Die Investitionen für die Muffin Monster betrugen nur etwa 20 bis 25 % der Kosten für neue Rechen.

  • 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.

Muffin Monster™ webinars:


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.

  • Commercial waste disposal from toilets
    Commercial wastewater from toilets comprises all sewage water flushed from toilets on commercial, industrial or public properties.

  • Commercial wastewater without toilet waste
    Commercial wastewater without toilet waste includes drainage and grey wastewater.

  • 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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