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Cyclic Organic Waste Treatment (COWT)

COWT is considered an energy efficient method due to its breakdown of organisms leading to an increase in A/D efficiency. The batch system used in this method also allows for adjustment to changing conditions without suffering too much additional energy costs. The process for COWT is energy efficient for its use of thermal hydrolysis (10~15%) with cyclic heat recovery and direct steam injection. This process is fairly adjustable for any project targets, such as biogas increase, sludge reduction, or solids fuel, with changing operation conditions (temperature and pressure). This method of COWT is typically used for pretreating A/D, reducing and recycling solid wastes, and reducing sludge.

 

Why use a Thermal Hydrolysis Process (THP)?

The Thermal Hydrolysis Process (THP) is an energy- & cost-efficient solution for organic waste treatment.

 

How does the Thermal Hydrolysis Process (THP) work?

  • Water content inside cell membranes leads to high waste volume.
  • THP breaks down cell structure using high temperature and pressure.

KEY ADVANTAGES

  • Enhances biogas production
  • Reduces volume of organic waste to lower hauling cost
  • Enables recovery of various target resources
 

Thermal Hydrolysis Process (THP) – Benefits

 

What is COWT?

  • BKT’s Thermal Hydrolysis (THP) Solution: Cyclic Organic Waste Thermal Process
  • Steam recycled between pair reactors to maximize energy recovery
  1. Thermal energy transferred directly between reactors to minimize heat loss
  2. Pair reactors in parallel to minimize footprint and cost
  3. Reduces cost of equipment from additional tanks
COWT

COWT

Alternative THP

Alternative THP

Direct heat transfer using patented multipoint sparger steam pipe modules

Flexibility in adjusting operation parameters (temperature, pressure, alternating feed, timing, etc) facilitates determination of optimal operation condition based on changing feed characteristics.

 

COWT Operation

Step Action Time(min) Description
1 Fill 20~30 Tank is filled with organic waste for hydrolysis
2 Steam Injection 20~25 Steam is injected from the parallel reactor and boiler
3 Hydrolysis 20~40 Hydrolysis is conducted at 300~390°F, 100~220 psi
4 Steam Transfer 20~25 Remaining steam is recycled to parallel reactor
5 Drain 5~10 Hydrolyzed product is drained byremaining pressure

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