LTC Dry™
Redefining the Art of Sludge Drying
LTC Dry™ is designed to address the challenges faced by both municipal and industrial waste generators. Instead of relying on high heat, flames, or convective air movement, LTC Dry™ uses indirect, conductive heat transfer under a strong vacuum to dry sludge with unmatched safety, efficiency, and environmental performance.
The vacuum environment lowers the boiling point of water, enabling drying at significantly reduced temperatures without sacrificing throughput. No external air enters the process, resulting in extremely low emissions, no dust, and minimal odor. The process also keeps PFAS compounds locked in the dried solids, preventing them from entering the air or condensate streams.
What to Look for in a Modern Sludge Dryer
Choosing the right sludge drying equipment means selecting a system that aligns with your operational, safety, and compliance priorities. While “low temperature” is one benefit, what truly matters is how the heat is transferred and how the process protects your plant and the environment.
Look for systems that:
- Use conductive heat rather than convective air movement.
- Operate in a vacuum environment to lower drying temperatures and eliminate oxygen.
- Require no external air intake, reducing emissions and simplifying permitting.
- Support multiple heat sources for flexibility and efficiency.
- Minimize odor, dust, and noise.
- Match drying capacity (kg/hr) to your sludge volume and processing timelines for optimal performance.
- Offer a modular design that supports incremental expansion or flexible integration into existing processes.
- Have low maintenance demands, with easy servicing and readily available replacement components.
LTC Dry™ delivers all of these advantages in a sealed, closed-loop process that’s scalable, safe, and energy-efficient.
compromising safety, reliability, or environmental standards.
How it works
-
Low Operating TemperaturesLow heat requirement due to dry matter conductive heating operated at low pressure.
-
Enhanced Thermal EfficiencyDesigned to utilize low-temperature waste heat sources from companion thermal destruction systems.
-
Low EmissionsLess odors and volatiles due to lower operating temperature.
Comparing Sludge Drying Methods
High-Temperature Systems
Traditional high-temperature dryers remove moisture quickly but rely on extreme heat and combustion. They are energy-intensive, harder to permit, and may degrade sludge quality.
Solar Drying: Low Cost, Weather Dependent
Solar sludge drying is an eco-friendly approach that uses the sun’s energy to reduce sludge moisture. However, it requires a large footprint and is limited by weather and geography. This method works best in dry, sunny climates but struggles in humid or rainy regions.
Vacuum-Based Conductive Drying — LTC Dry™
A completely different approach. Operates at reduced temperatures in a sealed vacuum chamber, using conductive heat transfer instead of hot air or combustion. This delivers high energy efficiency, extremely low emissions, and the ability to retain PFAS compounds in the dried solids.
The impact of LTC Dry™
-
High Thermal EfficiencyUses conductive heat transfer with indirect heating from a variety of low-temperature external sources (ie. fuel sources such as NG, propane, steam, electric heating, and other waste heat sources).
-
Operates with High Levels of Reliability and SafetyProcess uses no external drying air and operates under strong vacuum at low temperatures and requires limited operator attention. The vacuum environment eliminates oxygen, significantly reducing the risk of fire and enhancing overall safety.
-
Inherently Robust and Resilient ProcessProcess starts with already dry and preheated biosolids and introduces dewatered cake blended in low proportion to the recirculating dry solids.
-
Compact FootprintSimplicity of the process allows that it can be retrofitted into existing spaces and for greenfield installations requires low space relative to the capacity achieved.
-
Low Air Emissions and OdorsResulting from operation under strong vacuum without introduction of external air. This allows the technology to operate well with a wide range of sludge types and incoming moisture levels
Is Your Facility a Fit for Low Temperature Drying Technology?
Finding the right sludge drying solution starts with understanding your facility’s specific needs, space limitations, and regulatory environment. A low temperature sludge dryer like LTC Dry™ offers a compact, energy-efficient alternative to large, high-heat systems—making it a strong fit for many modern treatment settings. Whether you operate a small municipal plant or an industrial facility, low temperature sludge drying brings flexibility without sacrificing performance.
LTC Dry™ is ideal for:
- Facilities with small-to-mid volume sludge generation
- Locations under strict emissions or zoning restrictions
- Plants seeking reliable drying equipment with low manpower needs
- Operations with batch or semi-continuous drying cycles
This low temperature sludge drying system supports distributed wastewater treatment models and offers scalable options for both municipal and industrial operations.
By choosing a smart, modular system like LTC Dry™, your facility can improve operational efficiency, reduce emissions risk, and maintain compliance with today’s environmental standards—all while keeping maintenance and manpower to a minimum.
Legal Requirements and Compliance in Sludge Management
Meeting sludge treatment regulations requires safe, enclosed systems designed to reduce environmental and operational risk. LTC Dry™ supports compliance at every stage of the drying process, helping facilities stay within both federal and local regulatory limits.
LTC Dry™ helps facilities comply with:
- EPA 503 biosolids rules
- State-level disposal and air quality standards
- Permitting limits for emissions and odors
The sealed chamber and vacuum process contain moisture, volatiles, and thermal output — avoiding open-air hazards and minimizing permitting challenges.
