ATAD | ATAD stands for Autothermal Thermophilic Aerobic DigestionWHAT IS AN ATAD? ATAD stands for Autothermal Thermophilic Aerobic Digestion. The ATAD process, orginially developed in Europe, can be simply defined as liquid composting. Thickened material, to ensure a minimum organic strength for heat production, is fed to the ATAD unit.

The unique ThermAer Process System ATAD - ThermAer - offers a complete solution. The process yields a Class A, high quality pathogen-free product giving WWTPs a range of final biosolid management options.

The ATAD process complies with the EPA requirements for time and temperature and operates on a draw and fill cycle. Hold times based on time and temperature range from 4-20 hours. ATADs have been used in the US almost exclusively to digest TWAS, thickened above 4% TS.



WaterCon 2019
March 18 – 21
Crowne Plaza Hotel
Springfield, IL
**ThermAer Presentation March 18 at 8am**


European TAG 7 - Thermal Process Systems Presentation                                                                                                                                                         Watch Video      Use password isle123

 **For Immediate Release**  Evaluation the use of Biosolid based fertility treatments for use on high quality turf in the Chicago area in 2015 - E.J. Nangle, R.V. Townsend, F.D Dinelli  Read More

Class A Solids Success Story


Huntingdon Borough WWTP

Huntingdon, PA

WWTP wins award - click below to learn more!
Facility Details »

$109 / dry ton, Amazing!
In 2004, the City of Bowling Green, Ohio, installed Ohio's first TPS ThermAer Process expanding the plant capacity from 6 MGD to 10 MGD. This energy efficient process offered superior solids reduction and an odor-free operation. Doug Clark, Water Pollution Control Superintendent, calculated 2009 treatment costs at a remarkable $109 per dry ton. In addition, 38% total solids are coming off the centrifuge.

Speedway, IN - The TPS SNDR following anaerobic digestion shows exceptional results. Preliminary average results since May 2012 start up are: ammonia filtrate concentration of 14 mg/L plus an additional volatile solids reduction of 38%.

GENENA, NEW YORK AND CONESTOGA-ROVERS & ASSOCIATES WIN A 2015 ACEC New York Platinum Award for their Digester and Grit Systems Improvements Project. This award, inclusive in the Waste and Storm Water category, will be presented on March 28, 2015 at the Waldorf Astoria, New York, NY! Congradulations to all those involved in making this project a tremendous success!

NEW YORK WEA 2016 Annual conference to showcase the Genena ThermAer installation.  On Tuesday, February 9, Eric Haslam of GHD and Robert Wooldridge of Thermal Process Systems, presented Conversion from In-Vessel Compost to Aerobic Digestion for Production of Class A Biosolids.  In addition, on Wednesday, February 10, Scott Crosswell and Howard Butler both of GDH presented Next Generation ATAD Philosophy and Start Up Lessons.  Click for Program

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