Complete Guide to Compost Turner Equipment: Types, Sizing, and Costs
Why Proper Turning Equipment Matters
Composting is a controlled biological process that requires oxygen, moisture, and temperature management. Turning equipment aerates windrows, redistributes moisture, and maintains the temperatures (131-170°F) needed for pathogen reduction and rapid decomposition. The right turner can cut composting time from 6-12 months to 8-16 weeks.
Types of Compost Turners
Tractor-Towed Windrow Turners
A PTO-driven turning drum mounted on a towed chassis. The tractor straddles the windrow and pulls the turner through it.
- Best for: Small to mid-size operations (5,000-50,000 tons/year)
- Windrow sizes: 6-12 feet wide, 4-8 feet tall
- Brands: Komptech Topturn, Aeromaster, Brown Bear
- Price: $50,000-$150,000 new, $20,000-$80,000 used
- Pros: Low cost, uses existing tractor, simple maintenance
- Cons: Limited windrow size, requires large tractor (100+ HP)
Self-Propelled Windrow Turners
Purpose-built machines that straddle the windrow and turn material with a large rotating drum. The most efficient option for high-volume operations.
- Best for: Large operations (50,000-500,000+ tons/year)
- Windrow sizes: 12-30 feet wide, 8-14 feet tall
- Brands: Komptech, Vermeer CT, Scarab, BACKHUS
- Price: $300,000-$800,000 new, $100,000-$400,000 used
- Pros: Highest throughput, built-in water addition, GPS-capable
- Cons: Expensive, single-purpose machine
Excavator/Loader-Mounted Turners
Rotating drum attachments that mount on excavators or wheel loaders.
- Best for: Operations that already own carrier equipment
- Brands: Allu, HCL, Komptech
- Price: $25,000-$75,000 for the attachment
- Pros: Multi-purpose carrier, lower capital investment
- Cons: Slower than dedicated turners, less consistent turning
Sizing Your Compost Turner
| Annual Volume | Recommended Turner Type | Windrow Configuration |
|---|---|---|
| Under 10,000 tons | Tractor-towed or loader bucket | 6-8' wide, 4-6' tall |
| 10,000-50,000 tons | Tractor-towed or small self-propelled | 8-12' wide, 6-8' tall |
| 50,000-200,000 tons | Self-propelled | 16-24' wide, 8-12' tall |
| 200,000+ tons | Large self-propelled or multiple units | 20-30' wide, 10-14' tall |
Key Specifications to Compare
- Turning capacity (cubic yards/hour) — Determines how many windrows you can turn per day
- Maximum windrow dimensions — Must match your site layout and feedstock volumes
- Water addition system — Essential for maintaining 40-60% moisture content
- Drum design — Pick-style teeth for heavy material, paddle-style for lighter feedstock
- Engine emissions tier — Tier 4 Final required for most permitted facilities
