Dynamic Sewer Ventilation Modeling

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1 Dynamic Sewer Ventilation Modeling

2 Dynamic Ventilation Modeling 2 Outline Dynamic Ventilation Model Karl City of Burnaby Perspective Ron The Burnaby Model Karl Key Findings - Ron

3 Dynamic Ventilation Modeling 3 Why are we creating a model? Odours are dynamic and hard to verify Follow up and confirmation is a drain on operations resources Imprecise nature of current static calculations Margins of error (wide range of assumptions) Sewer fan testing required to calibrate, but costly We need a better computer based dynamic modeling tool!

4 Municipal Needs 4 Applicable to Municipal Context Tool for sewer sizing and for air management Tool to assess future odour issues related to growth Tool for sizing and planning future odour facilities Model proposed air extraction facilities without expensive fan testing Corrosion prevention planning

5 Dynamic Ventilation Modeling 5 Previous Work Unable to source commercially available software Has been completed in Sydney Australia by regional utility (Sydney Water) Required custom software to interface with a FEA model

6 The Model Approach 6 Applicable to Municipal Context Need a new tool to assess ventilation dynamics for planning and operations, and customer service complaints Has to be an add-on to the existing dynamic sewer model Has to be cost-effective

7 Model Development 7 Existing Hydraulic Model Input Variables Analysis Engine Outputs Sewage Flow Depth Pipe Info Air Pressure Air Flow Air Velocity Pressure Gradient Map

8 Burnaby Overview 8 Burnaby is an urban centre occupying 98.6 sq km, located at the geographical centre of a rapidly growing Metro Vancouver. While Burnaby occupies only 4% of the land area of Metro Vancouver, it accounts for 10% of the Region's population, approaching 225,000.

9 Sanitary Sewer System 9 Sanitary Sewers km mainline - 31,400 services (475 km) - Average age, 40+ yrs - Average size of 250mm dia. - range of 150m 900mm dia - Value $408M Combined Sewers - 59 km mainline - 5,100 services (75 km) - Average age, 54 yrs - Value $50M

10 City of Burnaby 10 Municipal requirements and commitment? Requirements Sewer Odour Management is a component part of Metro Vancouver s (MV) new regionally based Integrated Liquid Waste and Resource Management Plan (ILWRMP) dedicated to managing storm and sanitary sewer flows. Specifically, sections and 3.3.6, where the action involves documentation of GHG and odours associated with municipal sewer operations. Burnaby s commitments The City is committed to a program of systematic evaluation, response and corrective action related to management of odour complaints from residents and businesses.

11 Sewer Odour Management 11 Sewer odour confirmation customer service response Burnaby will receive >20 odour related service requests per year: 40% are confirmed or accepted 25% are associated with private property issues 20% unrelated issue or sources 15% not found Complaints are received and recorded in a work-order database. Service crews are dispatched to Investigate.

12 Sewer Odour Management 12 Sewer odour prediction customer satisfaction Only 40% of service calls relate to legitimate municipal sewer odour problems. A predictive model would help to confirm sewer odour potential arising from a customer service request Confirmed against modeling results, a complaint may be acknowledged over the phone and minimize need for further investigation. Corrective action may be planned more effectively leading to a quicker resolution and increased customer satisfaction.

13 Dynamic Ventilation Modeling Burnaby Perspective 13 Advantages Odour Confirmation Having a tool to be able to say there are odours in the area Odour prediction Having a tool that can assess impacts from future population growth, future design criteria changes Facility Sizing Able to assess facility options without expensive fan testing Facilty Plannning Ability to plan for future facilities and save appropriate land resources for future use

14 The Burnaby Model 14

15 Burnaby Model Hastings Sunrise 15 N

16 Hastings Sunrise 1 pm 16 N -ve pressure 600 mm 750 mm +ve pressure

17 Modeling Example 17

18 Modeling Example Known Odour 18

19 Next Steps Model Development 19 Burnaby model calibration Summer/Fall Flow Monitoring Program Odour logging this summer

20 Advantages of Dynamic Ventilation Modeling 20 Key Findings Cost effective, as an add-on to an existing dynamic sewer model Effective additional planning tool for future population growth Refines and improves master planning and capital works Important tool to satisfy ILWRMP requirements

21 Acknowledgements 21 Ms. Yuko Suda, P.Eng. Kerr Wood Leidal Associates Ltd.

22 Thank you for listening! 22 Ron Weismiller, P.Eng., FEC Karl Mueller, P.Eng. Water & Sewer Engineer Facilities Design Section Leader City of Burnaby Kerr Wood Leidal & Associates