Welcome to the event schedule and directory for the 13th Annual Salt Lake County Watershed Symposium, November 20-21, 2019. Free and open to all, the Symposium encourages a comprehensive review of the current state of our watershed while creating learning and networking opportunities for a broad array of stakeholders. Sessions cover a broad range of topics on water quality and watershed issues with local, regional, and national relevance. Hosted by Salt Lake County Watershed Planning & Restoration.

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Thursday, November 21 • 1:10pm - 1:40pm
Enhanced Biological Phosphorus Removal Using Side Stream Fermentation

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Enhanced Biological Phosphorus Removal Using Side Stream Fermentation

Enhanced Biological Phosphorus Removal (EBPR) can be used to limit the growth of algal biomass in natural water bodies but the cost of the external carbon source is a concern. However, sidestream fermentation of primary settled sludge or the waste activated sludge can serve as carbon source for simultaneous removal of phosphorus and nitrogen.

Full Abstract:
Nutrient accumulation in natural water bodies is a matter of concern considering the detrimental effects of eutrophication in aquatic life as well as humans. The proliferation of algal biomass in the water bodies creates low dissolved oxygen concentration for aquatic animals to sustain their life. Further, the toxins produced by some of the biomass- cyanotoxins from cyanobacteria- can impact humans as well. Nutrients in the form of nitrogen and phosphorus induce the growth of this biomass in natural water bodies. Hence, these nutrients should be removed or recovered for maintaining the ecological balance in natural water systems. Among the limiting nutrients, phosphorus removal isn't much emphasized in the wastewater treatment facilities. Even if it has been, it is more based on chemical precipitation. However, the cost of the chemicals and the fate of the products make it non-pragmatic. This lead to the discovery of enhanced biological phosphorus removal (EBPR). Under anaerobic conditions, the polyphosphate accumulating organisms (PAOs) consume readily biodegradable carbon (rbCOD) and store them as Poly-beta-hydroxyalkanoate (PHA) while releasing orthophosphate (Tu & Schuler, 2013; Martín & Ivanova, 2006). Then, in aerobic conditions, the stored PHA is oxidized releasing energy for the uptake of poly-phosphate (Smolders & Van Loosdrecht, 1995). The suitable concentration of rbCOD needs to be externally provided for the proper operation of the EBPR system. Using synthetic chemicals, this will be cost consuming. However, sidestream fermentation from waste activated sludge or the primary settled sludge can serve as the source of rbCOD. A lab scale reactor was run using the fermenter of similar composition as of obtained from the fermentation of the primary settled sludge at the Central Valley Water Reclamation Facility (CVWRF). Also, a continuous reactor was run at the Central Valley Water Reclamation Facility (CVWRF) using the fermenter from the primary settled sludge. Simultaneous removal of phosphorus and nitrogen was obtained with these operations.


Bishav Bhattarai

Graduate Research Assistant, University of Utah
Bishav is a PhD student under Dr. Ramesh Goel at the Department of Civil and Environmental Engineering in the University of Utah. He is working on different biological nutrient removal processes including Enhanced Biological Phosphorus Removal (EBPR).

Attendees (20)