Monday 2:30 PM
Biosolids - Wastewater
Evaluation of Stability During Lagoon Storage
Long-term anaerobic lagoon storage of anaerobically digested and dewatered biosolids is a proven process for further pathogen reduction to produce Class A biosolids. The goal of this work was to study properties of biosolids under different lengths of aging time to determine the stability of final product for its odor potential. Field lagoons of Metropolitan Water Reclamation District of Greater Chicago were sampled to estimate the spatial and temporal variations in the physical-chemical properties and biological stability indicators, namely, total solids, volatile solids, pH, electric conductivity, total Kjeldahl nitrogen, ammonia, nitrite/nitrate, accumulated oxygen uptake for the 20-hour respirometric test, soluble protein concentration and headspace concentrations of volatile sulfur compounds. The analyses of collected data suggest that the surface layer of the lagoon (depth of above 0.15 m) undergoes long-term aerobic oxidation resulting in higher degree of final product stabilization. The subsurface layers (depth below 0.15 m) are subjected to anaerobic environment where the conditions allow only the initial rapid organic matter degradation approximately within the first year, followed by very slow degradation. The results obtained in this study can be used as a basis for development of better biosolids handling practices to produce odor-free biosolids for land application.
Moderator: Lou Kollias
Irina Lukicheva - Illinois Institute of Technology
Irina Lukicheva is a PhD student at the Illinois Institute of Technology. During her work at IIT she has been involved in couple of collaboration projects with Metropolitan Water Reclamation District of Greater Chicago.