2015 Spring Conference

Transcription

1 2015 Spring Conference Meeting Strict Summer Permit Requirements on Day One: Start-up of the Western Wake Regional Water Reclamation Facility Chris White, PE April 13, 2015

2 Acknowledgements Town of Cary Damon Forney Greg Johnson Hazen and Sawyer Barry Bickerstaff Katya Bilyk Bob Difiore Ron Taylor David Wankmuller

3 Agenda Introduction Background Permit Facilities Process Model Sampling Start-up Results

4 Introduction New Influent and Effluent Lines New Plant Summer Limits Meet Permit on Day 1 Use Basin Capacity to Hold Flow

5 Background Western Wake Partners Town of Apex Town of Cary Town of Morrisville Interbasin Transfer Certificate Discharge to the Cape Fear River Basin Western Wake Regional Water Reclamation Facility WWRWRF Wastewater Management Facilities WWRWMF

6 Interbasin Transfer Cape Fear River Basin Neuse River Basin

7 Timeline 1992 Interbasin Transfer Certificate 2001 Interbasin Transfer Certificate With Conditions 2002 Planning Studies Began 2011 Construction Began 2014 Placed in Service

8 NPDES Permit BOD 5, mg/l Monthly Average Weekly Average April October November March TSS, mg/l Ammonia, mg/l April October November March TN (April October), mg/l 5.0 TP (April October), mg/l 0.75 TN Load (April October) TP Load (April October) 112,400 lbs/season 16,100 lbs/season

9 Wastewater Management Facilities Raw Wastewater Conveyance 2 major pump stations ~9 miles pipelines Wastewater Treatment New 18 MGD WRF Effluent Conveyance Pump station ~11 miles pipeline Outfall at Cape Fear River

10 Water Reclamation Facility Headworks Odor Control Administration & Maintenance Biological Reactor Basins Bulk Chemicals Switchyard Generators Clarifiers Filters Disinfection Effluent Pump Station Post Aeration Solids Handling

11 Basin Configuration Four Biological Reactor Basins (BRBs) Nine Cells Mixers: Cells 1 4 Jet Aeration and Mixing: Cells

12 Splitter Box Sluice gates direct PTE to each of the four BRBs Scum pumping station collects and sends scum to the scum digester

13 Basin Flow Preliminary Treatment Effluent Cells 1, 2, or 3 Return Activated Sludge Cells 1, 2, or 3

14 Recycles Fermentation Recycle Cell 2 to Cell 1 Anoxic Recycle (ARCY) Cell 4 to Cell 2 Nitrified Recycle (NRCY) Cell 7 to Cell 3 BRB Drain Pump Station return to Splitter Box Anoxic Recycle Fermentation Recycle BRB Drain Pump Station Nitrified Recycle

15 Aeration Four High Speed Blowers Jet Aeration and Mixing Cells 5 9 Coarse Bubble Diffusers Effluent Channel Blower Room

16 Fermenter Anaerobic Anoxic Anoxic Aerobic Aerobic Aerobic Post Anoxic Aerobic Process Configuration PTE RAS NRCY Fermentation Recycle ARCY

17 Chemical Feed Points Supplemental Carbon Cells 3 and 8 (Anoxic zones denitrification) Metal Salt Cell 9 and Effluent Channel Polymer Effluent Channel

18 Clarifiers Clarifier Influent Channel Clarifier Effluent Channel

19 Clarifiers Scum Pump Station Scum Pump Station Scum Pump Station Scum Pump Station RAS Pump Station WAS Pump Station RAS Pump Station RAS Pump Station RAS Pump Station

20 Process Model

21 Process Model 1 Basin 0.75 MGD, Adequate nitrification / denitrification capacity Second basin before 2 nd flow step-up Seeding ~600 mg/l target Model degradation effects Supplemental carbon Model predicted glycerin addition helps heterotrophs, but may negatively impact AOBs and NOBs Flow step-up 0.75 MGD to 2.66 MGD would require second seeding Split step-up into two events to give biomass time to grow

22 Process Model Chemicals Caustic Glycerin Ferric Polymer Solids 52 days to wasting (2500 mg/l MLSS) Intermittent wasting would not improve biomass growth

23 Batch Testing Concurrent with seeding July Evaluate nitrification Expected performance Quantify degradation Confirm seeding needs

24 Batch Testing July 29

25 Batch Testing mg NH3-N / g VSS / hr July July 25, ph July 25, ph July July 29, repeat 2.4 July Seeding 5 days July Flow Starts July 28 Additional Seeding July 30 Potential Seeding Aug 1

26 Seeding

27 Influent Flow

28 Recirculation Pumps Fermentation ARCY NRCY RAS All off at first except RAS Maximize nitrification time

29 DO Control Extra Air to Adjacent Basins

30 Caustic Feed Alkalinity concerns Feed issues (Manual drip) Recycles to distribute

31 Caustic Feed July 31, 8:00pm ph DO Time ph Cell 1 Reduce Caustic Feed 21: Head Cell : Head Cell : Head Cell : Head Cell : Head Cell : Mid Cell : End Cell :00 RAS 2 mgd Mid Cell :00 RAS 1 mgd End Cell :00 NRCY on 5.8 mgd 9:00 ~8.0 10:00 ~7.7

32 Caustic Feed Nitrate RAS Flow

33 Total Nitrogen Limit Supplemental Carbon Start August 8 Feed points Both anoxic zones Cell 8 aeration stopped Reaeration Zone (Cell 9) Anoxic Rely on Effluent Channel single drops

34 Total Nitrogen Limit Nitrate Probes

35 Nutrient Profiles Abbreviated profiles during Batch Tests Aug 2 Aug 7 Aug 9 Aug 10 Secondary Effluent Began Aug 12

36 Nutrient Profiles Ammonia

37 Nutrient Profiles Nitrate

38 Results

39 Timeline July July 28 July 30 August 8 August 12 Seeding Flow Starts Additional Seeding Supplemental Carbon Feed Starts Secondary Effluent Starts

40 Results Influent Effluent NOx <0.05 mg/l 1.19 mg/l TKN 30.4 mg/l mg/l TN 30.4 mg/l 2.02 mg/l TP 4.17 mg/l <0.10 mg/l

41 Questions Chris White