Phosphorus Workshop Ryerson University June 19, 2014 Michael Payne - PowerPoint PPT Presentation

Municipal Biosolids as a P source Phosphorus Workshop Ryerson University June 19, 2014 Michael Payne Black Lake Environmental

What are Biosolids?  Biosolids • result from municipal wastewater treatment • have undergone some form of treatment / stabilization  contain nutrients, organic matter and micronutrients  also contain trace amounts of other elements  and micro organisms  Estimated that Canadians generate 660,000 tonne (dry wt) per year 2

Influent Sources ~90% 3

Types of Sewage Biosolids  Lime Stabilized  Liquid aerobic  Dewatered  Pelletized  Liquid anaerobic  Composted 4

How are Biosolids Used in Ontario?  Biosolids are typically:  landfilled  incinerated  land applied • Agricultural Land • Forestry • Land Reclamation • Landfill Closure • Urban 5

Phosphorus Availability  Will vary depending on treatment method • Biological nutrient removal • Chemical removal • Further processing  Total P typically in 4% range (dwb) • Varies with influent sources  Availability • Ontario assumes 40% available in the year of application & another 40% over time 6

Limiters to Utilization  Public Perception • Contaminants: metals, legacy chemicals, PPCP’s, pathogens • Odour • “Ick” & “NIMBY” factor  Weather 7

Encouragers  Economics  Organics diversion mindset  Further processing  Marketing  Science 8