1. WEF SDC 2011 Expansion of Acton WWTP University of Guelph Team: Alexandra Chan Adam Erb Cynthia Mason Julia Veerman October 16, 2011

2. Outline  Introduction  Population Analysis  Process Selection  Phase 1 Design  Modeling  Noise & Odour Control  Construction  Phase 2 Design  Economic Evaluation  Conclusions and Recommendations

3. Review of Existing Facility

4. Problem Statement  Current WWTP operating near peak capacity  Need to increase capacity to accommodate projected growth in two phases  Meet projected effluent criteria

5. ParameterCurrent (m 3 /day) Phase 1 Given (m 3 /day) Phase 2 Given (m 3 /day) Average Daily Flow (dry weather)461056007000 Maximum Daily Flow (dry weather) 6160969014307 Instantaneous Peak Flow (wet weather) 159801495521452 Design Basis ParameterExisting Effluent Objective/Limit Proposed Effluent Objective/Limit BOD 5 (mg/L)2/5 TSS (mg/L)3/5 Total Phosphorus (mg/L)0.2/0.30.1/0.2 (Ammonia + Ammonium) Nitrogen (mg/L) Non-freezing period (May 1 to Nov 31) Freezing period (Dec 1 to April 30) 1.0/2.0 1.0/4.0 1.0/2.0 1.0/4.0 Unionized Ammonia (monthly average) (mg/L) Unionized Ammonia (any single sample) (mg/L) - -/0.1 -/0.016 -/0.08 Escherichia Coli (monthly geometric mean density) (#of organisms/100mL) 100/150

6.  Predicted linear growth  Assumed water saving devices at 10%  Infiltration/Inflow at 204 L/c/d Population Analysis ParameterCurrentPhase 1 Given Phase 1 Calculated Phase 2 Given Phase 2 Calculated ADF46105600762870008574 MDF61609690101931430711456 Peak1598014955264422145229721

7. Process Selection  Constraints  Accommodate design flows  Meet effluent discharge limits  Use available land  Be compatible with existing facility  Criteria  Cost effectiveness  Integration with existing facility  Environmental impact and footprint minimization

8. Phase 1 Design

9. Process Flow

10. Primary Clarifier

11.  Add two rectangular clarifiers  New volume 256 m 3  ADF SOR of 27.5 m 3 /m 2 /day  Maximum day flow  62.5% TSS removal  40.3% BOD removal  Chain & scraper sludge collector and scum removal system Primary Clarifier

12. Secondary Treatment

13.  Two conventional plug flow activated ‐ sludge system with nitrification  Accommodate 1275 m 3 /d required  Target MLSS = 4000 mg/L  SRT = 12 days  Fine bubble aeration  Positive displacement blower  Designed for max day flow + additional feedback flow Aeration System

14.  Two additional secondary clarifiers  Limiting solid flux concept  MLSS = 6620 mg/L  Overflow = 31 m 3 /m 2 d  Chain & scraper sludge collector and scum removal system  Max day flow design Secondary Clarifier

15. Tertiary Treatment

16.  85 mg/L liquid alum with 45% purity – 824 kg/d  Addition point in activated sludge tank Chemical Addition

17.  Dual media deep bed filtration  Existing filters work well to meet limits  Widely accepted in WWT  Easily retrofit  Leopold™ Type S™ Underdrain  Air scour + surface wash backwash  Max day flow design with one filter out of commission  SLR of 7.2 m 3 /m 2 /h Filtration http://www.wateronline.com/product.mvc/Universal-Type-S-Underdrain-0002

18.  UV selected as best disinfection method  Trojan UV3000Plus™ system  LP/HI lamp  Automatic and continuous dose pacing  Automated mechanical/chemical cleaning  Automatic level controller  Sized for peak flow UV Disinfection

19. Solids Handling

20.  Sequential dual-stage digester series  Add new series in parallel  Methane gas collected for heating  Thermophillic Stage 1  SRT 2 days  Recirculation pump mixing  Mesophillic Stage 2  SRT 8 days Bio-Solids Digester

21.  Belt press drying after digester  Polymer addition  Increases solids concentration from ~3% to ~25%  Cost-effective in disposal  Reduces footprint Sludge Drying

22. Mass Balance

23. System Controls and Instrumentation  Control strategy  Increased control and monitoring  Small relative capital cost  Significant efficiency improvements  Biological treatment  Aeration accounts for up to 50% energy consumption  Matched oxygen demand profile  Intelligent feedback control for aeration, RAS, WAS

24.  Clarifiers  Monitoring  Sludge pumping control mechanisms  Digesters  Control for feeding rates, recirculation, heating, withdrawal  Tertiary Treatment  Flow splitting  SCADA  Interfacing with SCADA for remote monitoring System Controls and Instrumentation

25. Hydraulic Profile

26.  Projected peak influent concentrations and flows  Proposed plant sizing  Clarifier modeling based on Lessard and Beck dynamic model  Activated sludge modeling completed using the IAWQ1 model Phase 1 – Model Inputs

27.  BOD and NH3 water quality requirements met  Model Shortcomings:  Chemical phosphorous treatment or tertiary filtration not accounted for Phase 1 – Model Results

28.  Currently no odour or noise issues  Reduce odour and noise  Buffer zone  Housing potential equipment Odour and Noise Control

29.  Completion in 24 months  Best management practices:  Construct in phases  Protect waterways  Provide training  Conduct inspections Construction

30. Phase 2 Conceptual Design

31.  Modify Plant B aeration basin configuration to plug flow + BNR  Investigate:  Membrane technology  Phosphorus extraction Phase 2 Conceptual Design

32. Total Capital Cost Estimate = $24M Phase 1 – Capital Cost

33. Annual O&M Cost Estimate = $1.2M Phase 1 – O&M Cost

34. Total Capital Cost Estimate = $12M Phase 2 – Capital Cost

35.  Expansion design to increase the Acton WWTP capacity  Preliminary Phase 1 design  Additional clarifier, disinfection, and anaerobic digestion trains  CAS + nitrification  Deep bed dual media filter  Belt press  Conceptual Phase 2 design Conclusions

36.  Implement sewer system improvement plan  Conduct more simulations  Obtain more cost-specific information from manufacturers  Conduct pilot tests Recommendations

37. Dr. Hongde Zhou, P.Eng., University of Guelph – Faculty Advisor David Arsenault, P.Eng., CH2M Hill – Consulting Advisor Rafiq Qutub, P.Eng., WEAO – SDC Sub- Committee Chair Lauren Zuravnsky, P.E., WEF – Design Competition Sub-Committee Chair Acknowledgements