How Land Clearers Turn Burn Piles into Revenue: Ash, Biochar, and Screened Topsoil
Every land clearing job ends the same way. You have a massive pile of wood waste sitting in the middle of a cleared lot. Stumps, root balls, brush, logs, slash. All of it needs to go somewhere. And getting rid of it costs money.
We have been selling heavy equipment since 1973. For most of that time, the land clearing conversation was about disposal. How fast can we burn it, haul it, or bury it? The conversation has changed. Today, the sharpest operators we work with are not just disposing of wood waste. They are turning it into three separate revenue streams.
This article breaks down the math, the equipment, and the workflow for turning burn piles into cash.
The Waste Problem Nobody Talks About
Land clearing is profitable work. But waste disposal eats into margins on every single job.
Hauling costs. Trucking wood waste off site runs $25 to $50 per load depending on distance. A 10-acre residential lot clearing can generate 30 to 60 truckloads of debris. That is $750 to $3,000 just in trucking before the material even arrives at a disposal site.
Tipping fees. Landfills and green waste facilities charge $40 to $80 per ton for wood waste. A single large clearing job can produce 200 to 500 tons of debris. At $60 per ton average, that is $12,000 to $30,000 in tipping fees alone.
Burn pile management. Open burning avoids tipping fees but creates other problems. Burn permits are harder to get in many counties. Smoke complaints trigger enforcement actions. Uncontrolled burns leave behind contaminated ash mixed with soil, nails, and partially burned debris. That ash still has to be managed.
Time. Whether you haul or burn, waste disposal ties up equipment and crew hours that could be spent on the next job.
The bottom line: waste disposal costs between 15 and 25 percent of total job revenue on most land clearing contracts. That is money coming straight out of your profit.
Three Revenue Streams from One Burn Pile
Product Price Range Buyers Biochar $200-$400/ton Farms, nurseries, landscapers, composters Wood ash $20-$50/ton Farmers, garden supply stores, soil blenders Screened topsoil blend $15-$30/cubic yard Landscapers, builders, homeowners These are not theoretical numbers. We hear them from operators running this workflow right now.
Biochar: The High-Value Product
Biochar is the big-ticket item. It forms naturally in the bottom of an air curtain burner where oxygen levels drop during a burn. The wood does not fully combust. Instead, it converts into a porous, carbon-rich material that improves soil health when added to the ground.
Biochar sells for $200 to $400 per ton as a bulk soil amendment. Bagged retail biochar commands even more. An air curtain burner running a full day produces 10 to 15 cubic yards of recoverable biochar. That is $1,200 to $1,875 in daily biochar revenue on top of your primary clearing work.
For a full breakdown of the production process, read our guide on how to produce biochar with an air curtain burner.
Wood Ash: The Volume Play
Clean wood ash is a natural soil amendment. It contains calcium carbonate (works like agricultural lime), potassium, phosphorus, and trace minerals. Farmers and garden suppliers buy it as a liming agent and potassium source.
Wood ash sells for $20 to $50 per ton. That is less than biochar, but you produce a lot of it. A single air curtain burner running on a clearing job generates several tons of ash per week. The margins are lower, but the volume makes it worthwhile — especially when the alternative is paying to dispose of it.
For more on the agronomic value and application rates buyers care about, read our wood ash soil guide.
Screened Topsoil: The Local Market Winner
Take the ash or biochar from your burn, screen it to remove debris, and blend it with native soil screened on site. The result is an amended topsoil product that landscapers, builders, and homeowners will buy.
Screened topsoil sells for $15 to $30 per cubic yard in most markets. Topsoil blended with biochar or wood ash commands a premium because of the soil health benefits. You are selling a finished product instead of raw material.
Our guide on which screen is better for topsoil walks through the equipment and process.
Equipment You Need: The Revenue System
This is about pairing two categories of equipment into a system that turns waste into products.
Air Curtain Burner: The Burn Side
An air curtain burner does three things at once:
- Disposes of wood waste on site. No hauling. No tipping fees. A mid-size unit burns 5 to 10 tons of debris per hour.
- Produces biochar. The bottom of the burn chamber naturally creates oxygen-starved conditions where pyrolysis occurs.
- Produces clean ash. The air curtain controls smoke and particulate emissions, so what remains is a clean, usable ash product.
We carry Merris air curtain burners new and stock used units from Air Burners Inc. Prices range from $50,000 for a compact towable unit to $200,000 for a large above-ground model.
For detailed specs on how air curtain burners work, read our guides:
Screening Equipment: The Product Side
Raw ash and biochar coming out of a burner are mixed with debris, rocks, nails, and unburned chunks. You cannot sell that as-is. You need screening equipment to grade it into a sellable product.
Trommel screens are rotating drum screens that separate material by size. Feed raw ash or biochar into the hopper, and the trommel separates clean product from oversize debris. Trommels handle high volumes and are the go-to for steady production.
Shaker screens sort material across flat screen decks. They are effective for finer grading, like producing a consistent soil-amendment-grade ash or biochar. Shaker screens are often more portable and set up faster on remote job sites.
Both types also screen the native soil on site for your topsoil blend. One machine handles both jobs.
The Workflow: Burn, Collect, Screen, Sell
Step Equipment Output 1. Clear and stage wood waste Excavator, dozer, grapple Sorted burn pile 2. Burn in air curtain burner Merris or Air Burners Inc unit Biochar and ash in burn chamber 3. Extract and quench biochar Rake, excavator bucket, water Raw biochar stockpile 4. Collect remaining ash Loader or skid steer Raw ash stockpile 5. Screen biochar and ash Trommel or shaker screen Clean, graded biochar and ash 6. Screen native soil Same trommel or shaker screen Clean screened topsoil 7. Blend (optional) Loader and mixing bucket Amended topsoil product 8. Stockpile and sell Loader and dump truck Revenue Timing matters. Biochar recovery works best when you pull material from the burn chamber before it fully combusts. Experienced operators run the burner in cycles: burn a load, rake out the char, reload.
Quenching is critical. Biochar pulled from the burner is hot. Quench it with water immediately and spread it to cool. Unquenched biochar can reignite in a stockpile.
Screen everything. Even if you are selling raw ash, run it through a screen first. Buyers expect clean, consistent material.
The Payback Math: Cost vs. Revenue
Equipment Investment
Equipment Estimated Cost Air curtain burner (mid-size) $120,000 Trommel screen (portable) $75,000 Total investment $195,000 Monthly Revenue (20 Working Days)
Product Daily Production Price Daily Revenue Monthly Revenue Biochar 3 tons $300/ton avg $900 $18,000 Wood ash 2 tons $35/ton avg $70 $1,400 Screened topsoil blend 15 CY $22/yard avg $330 $6,600 Total byproduct revenue $1,300/day $26,000/month Disposal Cost Savings
Elimination Calculation Monthly Savings Hauling (eliminated) 4 loads/day × $35 × 20 days $2,800 Tipping fees (eliminated) 10 tons/day × $60/ton × 20 days $12,000 Total savings $14,800/month Combined Monthly Value
- Byproduct revenue: $26,000
- Disposal cost avoided: $14,800
- Total monthly value: $40,800
- Payback period: Under 5 months
A $195,000 equipment investment generating $40,800 per month in combined revenue and savings pays for itself in under five months. Even if you cut these numbers in half to account for slower months and equipment downtime, you are looking at a 10-month payback.
Conservative Scenario (Biochar + Tipping Savings Only)
- Biochar revenue: $18,000/month
- Tipping fee savings: $12,000/month
- Total: $30,000/month
- Payback on $195,000: 6.5 months
Permits and Environmental Considerations
Air quality permits. Most states classify air curtain burners separately from open burning. Units that meet EPA 40 CFR Part 60 standards are permitted in many jurisdictions where open burning is banned. Check with your state environmental agency and local fire marshal before operating.
Burn permits. Many counties require a burn permit even for air curtain burner operation. The permit process is usually simpler and faster than open burn permits because of the emissions control the air curtain provides.
Selling ash and biochar. In most states, clean wood ash and biochar from clean wood waste are classified as beneficial soil amendments and can be sold without special permits. Avoid burning treated lumber, painted wood, or debris containing non-wood contaminants. Contaminated feedstock produces contaminated ash.
Stormwater and site management. Stockpile ash and biochar on a level surface away from waterways and storm drains. Cover stockpiles during rain events. Biochar is lighter than soil and will wash into drains if not contained.
Carbon credit certification. If you plan to sell biochar carbon credits, you will need third-party certification through programs like Puro.earth or the European Biochar Certificate. Start with direct product sales first. Add carbon credits as you scale.
Building Your Buyer List
Farms and ag operations. Contact farms within a 50-mile radius. Focus on operations working with poor or sandy soil. Biochar and wood ash both improve soil fertility. Offer a trial load at a reduced rate so they can test the product.
Landscaping companies. Landscapers buy screened topsoil in bulk. A topsoil product blended with biochar or ash is a premium offering they can sell to their own customers as a soil health upgrade.
Garden centers and nurseries. Bagged biochar sells at retail for $15 to $30 for a 2-cubic-foot bag. If you have the volume to bag it, the margins are dramatically higher than bulk sales.
Composting facilities. Biochar added to compost speeds up the process and improves the finished product. Compost operations buy biochar as a feedstock additive.
Municipal and government buyers. Some counties and municipalities purchase soil amendments for parks, road medians, and public land restoration.
Frequently Asked Questions
How much biochar does an air curtain burner produce per day?
A standard mid-size air curtain burner with manual biochar recovery produces 10 to 15 cubic yards per day when running a full shift. Dedicated biochar systems like the CharBoss from Air Burners Inc produce 300 to 500 pounds per hour continuously. For the full production process, read our biochar production guide.
Is wood ash safe to sell as a soil amendment?
Yes, clean wood ash from untreated timber is a recognized soil amendment. It contains calcium carbonate (similar to agricultural lime), potassium, and phosphorus. The key word is "clean." Ash from painted wood, treated lumber, or mixed construction debris can contain heavy metals and is not suitable for agricultural use.
Do I need a special permit to sell biochar or wood ash?
Regulations vary by state. In most states, biochar and wood ash from clean wood waste are classified as beneficial soil amendments and do not require special sales permits. Contact your state department of agriculture for specific requirements in your area.
What is the difference between biochar and wood ash?
Biochar is partially burned wood that retains a porous carbon structure. It improves soil water retention and provides habitat for beneficial soil microbes. Biochar sells for $200 to $400 per ton. Wood ash is fully burned wood — powdery, alkaline, and works primarily as a liming agent and potassium source. Wood ash sells for $20 to $50 per ton. Both are useful, but biochar is the higher-value product.
Can I produce biochar and wood ash on the same burn?
Yes. A single air curtain burner produces both products during normal operation. Biochar accumulates in the lower portion of the burn chamber where oxygen is limited. Ash forms in the hotter zones where combustion is complete. One burn produces two sellable products.
What screening equipment works best for grading ash and biochar?
Trommel screens are the most common choice for high-volume ash and biochar screening. The rotating drum design handles the fine, dusty nature of ash well. Shaker screens work better for finer grading and smaller batches. For guidance on which works better for topsoil, read our shaker vs trommel comparison.
How do I price screened topsoil blended with biochar?
Standard screened topsoil sells for $15 to $30 per cubic yard in most markets. Adding biochar or wood ash allows you to charge a premium of $5 to $15 per yard over standard topsoil. Position it as "amended topsoil" or "biochar-enriched topsoil." Landscapers and garden centers recognize the added value.
What size air curtain burner do I need for land clearing work?
It depends on your daily volume. Compact towable units handle 2 to 4 tons per hour and are good for residential lot clearing. Mid-size and large above-ground models handle 5 to 10 tons per hour and are built for commercial clearing, right-of-way work, and disaster debris. Call us at 770-433-2670 and tell us about your typical job size. We will match you to the right machine.
Stop Paying to Throw Away Money
Every ton of wood waste you haul to a landfill is a ton of product you could be selling. Every tipping fee is revenue you are handing to someone else. The equipment to change that equation exists today, and it pays for itself in months, not years.
An air curtain burner paired with a screen turns your land clearing operation from a disposal cost center into a production system. You get faster job completion, zero hauling costs, and three products you can sell on every single project.
We sell both sides of this system. Browse our air curtain burner inventory for the burn side. Check our trommel screens and shaker screens for the screening side.
Call 770-433-2670 or email Sales@grindercrusherscreen.com. Tell us what you are clearing and how much volume you move. We will show you what the revenue side looks like with real numbers for your situation.