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AGT Hot Box 250

The AGT Compost Hot Box 250 is a value-packed compost aeration system with heat recovery and material drying capabilities,  providing capabilities to manage four or eight compost windrows via negative and positive aeration, vapor recirculation and drying modes all in a 20' insulated shipping container.

content for AGT Compost Hot Box 250-8RD-1

About the Hot Box 250 Series

The Hot Box 250 series is available in 4 and 8 zone configurations.  The 8 zone AGT Compost Hot Box 250-8RD was designed to maximize operator control options with this compost aeration and heat recovery (CAHR) package.  Two blowers and corresponding sets of heat exchangers, valve, sealed ductwork, sensors and controls are oriented side-by-side in an insulated 20' shipping container.  With a fresh air intake and the two heat exchangers, the drying feature is standard.  This gives operators the flexibility to manage eight windrows with negative and positive aeration, vapor recirculation and/or forced heated air drying.    

Typical compost windrow batches sizes are 250 cubic yards (CY) depending on the mixture bulk density and oxygen demand.  With eight zones this means 2000 CY of material under aerated management at a time, and with a typical 4 week aeration cycle, sites can process 26,000 CY per year with this single modular CAHR unit.

Space and process efficient, the Hot Box 250-8R accelerates the time to achieving targeted temperatures of 131 F or greater.  Vapor recirculation or forced heated aeration of newly loaded batches promotes aerobic thermophilic conditions in the core of fresh compost mixes.  Beneficial for odor control and speed to achieving PFRP required temperatures for pathogen and weed seed destruction, recirculation has a major impact for improved wintertime composting conditions. 

Specifications for AGT Compost Hot Box 250-8RD

  • Housing:  20’ long shipping container with spray-foam insulation, interior lighting and outlets.
  • Aeration:  Two 3 horsepower blowers with speed control, 100 to 500 CFM operating ranges, 6" to 8” pipe connections
  • Compost Batches:  Operates eight compost batches of 150 to 300 CY each. Negative or recirculating aeration, fresh and heated air batch drying is standard.
  • Controls: Timer-controlled cycling of automated batch aeration. Expandable PLC system and touch-screen HMI interface, remotely accessible.  Two sets of digital batch tracking of vapor temperature, oxygen, air flow, and water flows and temperatures.

Installing the Hot Box 250

    The Implementation Process

- Hot Box(es) built to order
- The site is graded, utilities (electric, hot water, data) and drainage pipes installed
- Sump tank is placed, HDPE pipes and aeration channels installed
- Push walls are built and concrete working pad(s) cast in place
- Hot Box is set in place and connected to aeration pipes, biofilter and utilities
- Electrical and data are connected, system is tested in place with empty pad
- Hot water system is connected

hot box 8 turned ASP
If the Hot Box 250-8R seems a little too small, the Hot Box 1000 is the scaled-up model that could be a better fit!