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STM-32 Trapezoidal Pile Turner

THE compost turner for pile composting.

Not all compost is created in rows. Solid beds of compost, sometimes called aerated static pile (ASP) compost systems, continuous stack composting, or trapezoidal pile composting, eliminate the space between windrows and require a different type of compost turner to minimize odors and make great compost.

Introducing the Menart STM-32 Trapezoidal Pile Turner, the perfect machine for maintaining indoor or outdoor trapezoidal pile compost curing operations.

Featuring an efficient and powerful 375 hp Cat® C9.3B EPA Tier 4 Final diesel engine, the Menart STM-32 compost turner can easily handle 12’ trapezoidal pile heights and discharges turned compost with its side conveyor.

Pile it, then turn and earn with the Menart Trapezoidal Pile Compost Turner!

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Product Features

Product-Features_Control-System

Control System

All machine operations are controlled by a single joystick, 10” touchscreen, and steering wheel in the comfortable cabin.

STM-32 - Cutting Width

Cutting width

6’ head cutting width cuts into compost bed and turns material, then transports it out of the machine’s side to create a freshly turned bed.

STM-32 - Rotors

Processing Rotors

2 hydraulically powered processing rotors (4.3’ dia. upper rotor and 5.4’ dia. lower rotor) feature armored drum tools for longer life.

STM-32 - Side Discharge

Side Discharge

Turned material is side discharged via a 11.4’ height conveyor across the working aisle.

STM-32 - Windrow Processing

WINDROW PROCESSING

Properly aerate and homogenize trapezoidal compost beds up to 12’ tall.

STM-32 - Self powered

SELF-POWERED AND EFFICIENT

The Cat® C9.3B diesel engine provides 375 hp and meets U.S. EPA Tier 4 Final emission standards.

STM-32 TRAPEZOIDAL PILE COMPOST TURNER Demonstration

Interested in the Menart STM-32 trapezoidal pile compost turner? Contact us to arrange an on-site demonstration at your facility, running your material, to see just how good it is!

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A cut-out image of the Menart STM-32 trapezoidal pile turner showing its two cutting heads and enclosed operator cab.

Case Studies

Case Study Update: Catalyst BioAmendments

December 29, 2025

When we first featured Catalyst BioAmendments in 2021, the Nevada City, CA company was already known for producing exceptionally high-quality, microbe-focused compost and for challenging assumptions about what compost at…

Table to Farm Compost Turns Food Scraps into Compost with Its BACKHUS A38 Turner

June 12, 2025

You’ve probably dined at a ‘farm to table’ restaurant that offers fresh, locally produced ingredients, supports local economies, and emphasizes transparency in its menu, letting consumers know exactly where their…

Marin Sanitary Service Helps Turn Food into Clean Energy with Tiger HS-55 Depackager

May 19, 2025

Marin Sanitary Service (MSS), based in San Rafael, California, is a recycling pioneer that provides residential and commercial waste collection, recyclables, and organic waste pick-up services for Marin County. This…