CAHTS-Class A Heat Treatment System

CAHTS (Class A Heat Treatment System) is a patent pending breakthrough in biosolids technology developed by a treatment plant manager to be the simplest, most efficient and cost effective system for the mesophilic anaerobic process.

CAHTS is typically installed after the primary mesophilic digester (1). Digested sludge macerated and metered (2) through a heat exchanger (3) utilizing boiler heat generated by the increased biogas to pasteurize the sludge. A detention vessel (4) holds for one hour at 65 degrees C (150 degrees F) to meet the 40CFR503 requirements for time-and-temperature, before finally discharging Class A biosolids (5) to the secondary digester, where further volatile solids and vector attraction reduction occur, and for cooling and storage before dewatering. The enhanced process lyses the cells, releasing proteins that generate additional biogas, while requiring less polymers for dewatering. In the case of smaller wastewater plants with only a primary anaerobic digester, installation prior to the digester may be required. This is a continuous flow process that is PLC controlled and recorded.

CAHTS can easily retrofit most existing anaerobic wastewater treatment plants. System design is compact, and can even be skid mounted for smaller installations. All systems are custom designed to suit specific plant processes and layouts.

Conforms to 40CFR503 for Class A Biosolids

Energy Efficient - Uses existing biogas

Enhanced Volatile Solids Reduction

Increased Methane Production

Virtually Eliminates Odors

Simple to Operate

Low Maintenance

Small Footprint

"Solid" Return on Investment

CAHTS Sizing Data Sheet (pdf)

CAHTS Sizing Data Sheet (electronic submission)

WEFTEC 2007 Abstract Submission (pdf)