Colt Technologies, Inc.

Biosolids Dryer Emission Control - Case Study


Courtesy of Colt Technologies, Inc.

Colt has completed multiple Biosolids dryer projects, achieving unmatched performance and reliability. In order to handle this very demanding application, Colt engineers started with a clean sheet of paper, and designed the RTO with features that address the problems plaguing the dryer industry.

Colt's Dallas based Air Quality Control Group received an order for a 3 chamber MAXIM™ RTO system to control the Volatile Organic Compound (VOC) and Hazardous Air Pollutant (HAP) emissions from a municipal sludge dryer.

This order followed the year long repair and maintenance of a competitor's 2 chamber RTO which had been causing outages monthly since its startup.

biosolids thermal oxidizer 1


  • Corrosion of components from Hydrogen Sulfide
  • Plugging of Heat Recovery Beds with organic particulates in the dryer exhaust
  • Siloxane converting to Silica Dioxide in beds and causing premature bed failure
  • Hazardous Air Pollutants requiring very high destruction performance (99%+)
  • Effective means of washing out the beds
  • Very high reliability required with long runs between scheduled outages for service


  • Design RTO Heat Recovery Beds for easy, effective washout
  • Provide custom designed heat recovery media
  • Allow easy collection of wash water
  • Strategic use of corrosion resistant alloys and composite materials


  • MAXIM RTO has 12 months of uninterrupted operation since startup
  • Easily met all California emission standards

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