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Odor Control Benchmarking Study: Status & Preliminary Results

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Presentation on theme: "Odor Control Benchmarking Study: Status & Preliminary Results"— Presentation transcript:

1 Odor Control Benchmarking Study: Status & Preliminary Results
Dr. Carla Dillon, P.E. Orange County Sanitation District Chair, WEF Air Quality & Odor Control Committee

2 Agenda Background of Survey Participants/Survey Categories
Sample of Responses Drivers Outreach Regulatory Collection/Conveyance Findings WRRFs Findings Odor Control Spending Needs

3 Background Timeline Value Benchmarking Data
Idea at Odor & Air Quality Specialty Conference 2014 In early 2015, team began planning desired information and questions Survey beta tested started early 2016 Survey open to public June 2016 to December 20, 2016 Presented preliminary data at WEFTEC 2016 Workshop Proposed half session for WEFTEC 2017 on the results Value Benchmarking Data Benefits for utilities Benefits for vendors/manufacturers Benefits for consultants Benefits for researchers Benefits for regulators

4 Who participated? – WRRFs (as of 9/2/2016)
 Characterizing the participants Size, by population 20,000 to 6 million Size by flow, 0.6 – 690 MGD BOD: mg/L TSS: mg/L

5 Survey Sections Categories (responses of 9/2/16)
General Participant Information – 74 Strategic Efforts, Outreach, Management – 68 Regulatory Compliance – 54 Collection System and Collection System Odor Control - 52 Odor Control at Water Resource Recovery Facilities – 44 Maintenance and System Integrity – 39 Capital Improvements in Odor Control – 38 Survey still open:

6 Sample of Responses from Preliminary Data
Results Sample of Responses from Preliminary Data

7 What Drives Odor Control/Management Decisions?
Corrosion Control (5) Employee safety (4) Costs Citizen lawsuits Downstream processes Water quality

8 Outreach and Response Action Levels None 18%
Any complaint, no nuisance 47% D/T or OU 15.8% mostly 3-7 range H2S 18% 10 ppb was common response 50 ppb peak at receptor 30 ppb scrubber discharge

9 Regulatory 66% of respondents are required to comply with an air/odor permit or regulations Of those Go beyond permit requirements? 46% responded YES 25.8% 19.4% 48.4%

10 Technology Used in Collection/Conveyance System
% of total units % of treated airflow Biofilter 20.3% 26.3% Bioscrubber 5.5% 24.3% Activated Carbon 66.7% 42.4% Chemical Scrubber 6.3% 7.0 % Iron Sponge 0.5% -- Ionization No. of treatment units Airflow treated, cfm Total 378 615,566

11 Technology Used in Collection/Conveyance System – Chemical Addition

12 WRRF Questions by Process Area
Headworks/Preliminary Primary Secondary Solids Processing Gas Digester Systems and Support Facilities

13 WRRF liquid treatment at Headworks/Preliminary Treatment

14 WRRFs by Process – Headworks/Preliminary

15 WRRFs by Process – Headworks/Preliminary

16 Gaps/Needs Planning/design, specifications and product information for more than H2S Biotrickling filter chemistry: pH and precipitates Liquid chemistries: complementary treatments, efficacy for non-H2S odors High purity oxygen for treating low concentration gravity flows Ventilation rates for indoor air quality as opposed to electrical code Chemical fate and transport of odors

17 Benchmarking Workgroup
Rebecca Arvin-Colón, WEF staff Carla Dillon, Orange County Sanitation District Dennis Froehlich, Pima County Regional Wastewater Reclamation Department Eric Hansen, Evoqua Water Technologies LLC Mark Holstad, Albuquerque Bernalillo County Water Utility Authority Dick Pope, Hazen and Sawyer Ray Porter, Porter Odor Science Philip Wolstenholme, Brown and Caldwell

18 Orange County Sanitation District
Thank You WEF AQ&OC Committee Benchmarking survey: Contact Information Carla Dillon, D.P.A., P.E. Orange County Sanitation District


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