Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


Most biosolids in the USA are recycled via agricultural land application. In several states, including California, this practice is under attack as being unacceptable. Some agencies are seeking technologies, like thermal drying, to produce a more acceptable Class A product. While drying does produce a fine marketable product that can be used as fertilizer or fuel, it is expensive to evaporate water from biosolids containing 20%–25% total solids.

EnerTech's patented SlurryCarb™ process chemically converts biosolids into a high-energy, renewable solid fuel, providing an environmentally and economically sound solution for biosolids management. The process heats biosolids under pressure to significantly improve dewaterability. Biosolids are mechanically dewatered to 50% total solids and fed to the dryer. Thus, the amount of thermal energy needed to dry the biosolids is reduced by almost two-thirds and the cost by about one-third.

EnerTech has constructed a Process Development Unit (PDU) located in Atlanta. EnerTech's 54.5 liters (14.4 gallons) per hour PDU includes all the necessary pumping, heating, depressurizing and dewatering systems necessary to simulate a commercial scale SlurryCarb™ facility. The PDU has provided comprehensive engineering data from extended operations in the last twelve months. This paper includes final design criteria and an update on the status of the Rialto Regional Biosolids Processing Facility in Southern California.

Construction of the 614 metric tons (675 wet tons) per day Rialto facility has started. The dried product from this facility will be used as a renewable fuel in lieu of coal in a cement kiln. This unique beneficial use lowers green house gas emissions, reduces ore consumption, leaves no residue for disposal, provides permanent recycling of the biosolids, and eliminates all the health and environmental concerns associated with agricultural use.

Document Type: Research Article


Publication date: 2007-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more