WEF Discussions — Now on LinkedIn!

WEF is pleased to announce the creation of free LinkedIn groups associated with its technical discussion forum topics. Through these LinkedIn groups, members will be able to view and participate in discussions, as well as communicate with one another via direct messages. Share your experiences and knowledge, ask questions and respond to other discussions as frequently as you like!

You must have a LinkedIn profile to join a LinkedIn group; you can create your profile here. If you already have a LinkedIn profile, all you need to do is submit a request to join one or all of the following groups:

Water Environment Federation (Main) | Biosolids | Collection Systems | Nutrients | Stormwater 
Utility Management | Water Reuse | Water for Jobs | Watershed Management | Laboratory Practices 

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Low-cost low-tech approach to Class A Biosolids
Mark Bowman
Posted: Monday, November 28, 2011 11:11 AM
Joined: 10/13/2009
Posts: 1

I've recently taken an interest in low-cost/low-tech processes that use non-proprietary Sludge Process Trains (SPT) that are capable of producing a PFRP product that has been recognized by several State Biosolids Coordinators and the USEPA as Class A. 


Although varied somewhat, each of the SPTs I’m interested in use a batch approach and age either an aerobically or anaerobically digested sludge in either a lagoon or in the case of a cake, separate piles. Once sufficiently aged, (generally about two years) the sludge is then spread onto a paved surface where it is windrowed and periodically agitated until it reaches a TS of ~65%. 


I’ve now read several papers (available upon request) on this SPT and would like to invite further discussion on the process. 


  • Low/moderate capital costs  
  • Low operations and maintenance requirements  
  • Low energy costs  
  • Low noise potential  
  • Beneficial reuse options  


  • Moderate/high land requirements 
  • Moderate odor potential 


Posted: Friday, June 29, 2012 11:46 AM
Joined: 6/29/2012
Posts: 1

I am interested in reading these papers.  Could you please pass them along?  Thanks!