Monday 10:30 AM
[Presentation PDF]

Room: Diamond

Effect of Solids Content on Stability of Air-Dried Biosolids Stored in Stockpiles

The Metropolitan Water Reclamation District of Greater Chicago produces air-dried biosolids that are utilized as a fertilizer and soil amendment for turf grass in the Chicago metro area. The development of odors when air-dried biosolids are stored in stockpiles for an extended period is a major factor controlling public acceptance, year-round availablity and overall market value of the product. A study is being conducted to determine the impact of dryness and duration of storage on odor development in air-dried biosolids. Biosolids of six different solids content were stockpiled and samples were taken biweekly during the first two months and after 240 and 365 days of stockpiling to monitor stability of the biosolids chemical and physical properties. The six stockpiles show increased odor (ED50) within the first 15 days, irrespective of solids content, and stockpile with the lowest solids (55% solids) show the greatest odor (ED50 = 559) at 15 days after stockpiling, but the odor decreased afterward in all the windrows. The data collected so far show transformation of N species and reduction in odor emissions in the stockpiles over time. A follow-up study is underway to determine impacts of other variables and validate the findings from this study.

Moderator:  Lou Kollias


Olawale Oladeji - Metropolitan Water Reclamation District of Greater Chicago
Dr. Oladeji is an Associate Environmental Soil Scientist with Metropolitan Water Reclamation District of Greater Chicago (MWRDGC). He is interested in beneficial reuse options for biosolids and his current role includes promotion of biosolids produced by MWRDGC to end users. His research interest is in agronomic benefits and environmental impacts of land applied biosolids and has authored many publications in these aspects of biosolids. He obtained his PhD in 2006 from University of Florida and has since worked as Research Associate at Michigan State University and University of Florida before joining MWRDGC.