Solar-Thermal Pasteurization Technology
A proven system combining solar greenhouse drying, thermal pasteurization, and pelletization to provide an effective turn key solution for sustainable, long-term biosolids management.Watch the Process Come Together
In this short overview, Ted Merrell walks through the Solar-Thermal Pasteurization process, showing how greenhouse drying, thermal pasteurization, pelletization, storage, and beneficial reuse all work together as one complete biosolids management system.
Modern Treatment for a Changing Biosolids Landscape
Municipal wastewater facilities are under pressure. Disposal options are shrinking. Landfill capacity is tightening. Regulations are evolving. Odor concerns are growing. Transportation costs are climbing.
Solar-Thermal Pasteurization gives municipalities a better way forward.
Biosolids Management Is Getting Harder to Ignore
Disposal Options Are Shrinking
Landfills and traditional outlets are becoming harder to rely on as capacity tightens and costs rise.
Odor Creates Public Pressure
Open or poorly controlled handling can create complaints, public concern, and pressure on utility leaders.
Regulations Are Tightening
Communities need treatment methods that support higher product quality, documentation, and long-term confidence.
Outdated Systems Limit Flexibility
Older storage, drying, and disposal strategies leave municipalities with fewer options as expectations shift.
A Smarter Path From Biosolids to Beneficial Reuse
Solar-Thermal Pasteurization combines the natural drying power of the sun with engineered process control.
Think of stepping into a parked vehicle on a hot summer day. Sunlight passes through the glass, heat builds inside, and the enclosed space becomes significantly warmer than the outside air.
Greenhouse pods use that same basic principle in a controlled industrial environment built for biosolids treatment.
Designed to Solve the Problems Municipalities Face Now
Solar-Thermal Pasteurization addresses the full chain of biosolids pressure, from hauling and odor control to landfill reliance, compliance, beneficial reuse, and future planning.
Reduces Hauling Exposure
By removing moisture and reducing volume, the system helps decrease the amount of material that needs to be transported.
Improves Odor Control
Enclosed handling and controlled process flow provide a more managed environment than many traditional approaches.
Supports Regulatory Confidence
Thermal pasteurization provides a controlled path toward Class A and Class AA biosolids production.
Creates a Marketable Product
Instead of producing a disposal material, the process can create a cleaner fertilizer product for beneficial reuse.
Reduces Landfill Dependence
The system helps municipalities move away from landfill-dependent strategies and toward resource recovery.
Supports Long-Term Planning
Scalable greenhouse, pasteurization, and pelletization systems can be planned around future growth.
How Solar-Thermal Pasteurization Works
The system moves material through a controlled path from wet cake to market-ready fertilizer.
Dewater
Biosolids enter the system after existing dewatering.
Solar Dry
Greenhouse pods use solar energy and controlled airflow to reduce moisture.
Pasteurize
Time and temperature are managed to support pathogen reduction.
Pelletize
Treated material can be formed into a cleaner, uniform fertilizer product.
Reuse
The final product can be stored, loaded, bagged, or distributed.
Designed to reduce one of the biggest public concerns in biosolids management.
Odor is more than an operations issue. It can affect nearby residents, public perception, property development, and long-term confidence in the wastewater utility.
Odor control is built into the system.
Biosolids are managed through enclosed buildings and greenhouse pods, while process air is moved through dedicated odor-control systems before discharge.
How the process works
Enclose the process
Greenhouse pods and process buildings help contain odor-bearing air.
Move and manage the air
High-volume ventilation supports capture, airflow control, and treatment.
Treat before discharge
Odor-control towers and carbon filtration help polish captured air.
Proven in operating facilities
Municipal leaders and engineers can see the process operating in real-world facilities.
Why this matters
Better odor control helps reduce complaints, protect public trust, and support a more defensible long-term biosolids strategy.
See the System in Operation
Solar-Thermal Pasteurization is not a concept on paper. It is operating in real facilities and helping municipalities rethink what biosolids management can become.
Designed to Integrate With Existing Dewatering Infrastructure
Every wastewater treatment plant is different. That is why Solar-Thermal Pasteurization is designed to be evaluated around your facility’s existing process, site conditions, solids output, hauling costs, and long-term goals.
The system can work downstream of existing dewatering equipment, helping municipalities upgrade their biosolids strategy without replacing the entire treatment plant.
- Current dewatering method
- Wet tons or dry tons produced
- Hauling and disposal costs
- Available land or facility space
- Odor concerns and regulatory goals
- Desired end product
Patented Innovation. Proven Systems.
Merrell Bros., Inc. currently holds 7 issued U.S. patents with 6 additional patents pending, reflecting our commitment to advancing biosolids technology through real engineering innovation. These services (or systems/processes/technologies) incorporate proprietary technologies protected by one or more patents or pending patent applications.
Engineered In-House. Proven in the Field.
Our technologies are developed and refined by Merrell Bros.’ internal R&D and engineering teams, who remain at the forefront of responsible, performance-driven biosolids management. Our patented systems reflect continuous advancement in sustainable biosolids treatment and long-term infrastructure performance.
Ready to Rethink Biosolids Management?
If your municipality is facing rising disposal costs, landfill pressure, odor concerns, or long-term uncertainty, Solar-Thermal Pasteurization offers a practical path forward.
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