Odor Control Update Crozet Interceptor System and Moores Creek - PowerPoint PPT Presentation

Odor Control Update Crozet Interceptor System and Moores Creek AWRRF Board of Directors Meeting July 25, 2017 Richard Gullick, Director of Operations Timothy Castillo, Wastewater Manager

Overview  Crozet Interceptor – change in treatment  MCAWRRF Short-Term Solution  MCAWRRF Long-Term Solutions

Crozet Interceptor Odor Control Pump Station #1 Pump Station #2

Results Summary Comparison of Hydrogen Sulfide at Crozet Interceptor Pump Stations June '16 June '17 June '16 June '17 Average H 2 S Average H 2 S Maximum H 2 S Maximum H 2 S (ppm) (ppm) (ppm) (ppm) Location VENDOR A VENDOR B % reduction VENDOR A VENDOR B % reduction Pump Station #3 4 0.1 98% 149 11 93% Pump Station #2 1 0.1 90% 50 8 84% Pump Station #1 2 0.1 95% 93 10 89% Manhole #31 2 0.4 80% 153 63 59%

H 2 S at Crozet Interceptor Pump Station #3 V E N D O R A V E N D O R B

MCAWRRF Short-term Odor Control Ferric Chloride Tanks and Feed Pump Chemical Feed Point at Headworks

Results Summary Hydrogen Sulfide Concentrations at MCAWRRF Primary Clarifier Launders June/July 2014 June/July 2017 H 2 S (ppm) (without FeCl 3 ) (with FeCl 3 ) % reduction Avg. 21 2 90% Median 20 1 95% Max 85 29 66% Min 13 0 100%

H 2 S at MCAWRRF Primary Clarifiers

Effect Number of citizen odor complaints: March 2016 March 2017 thru June 2016 thru June 2017 % reduction Crozet Interceptor 13 0 100% Moores Creek AWRRF 12 0 100%

Long-Term Odor Control Equalization Basin Bypass Piping Foul Air Bio-Scrubber