Comparison of Three Wet Weather Flow Treatment Alternatives to Increase Plant Capacity

Transcription

1 OWEA 2013 Comparison of Three Wet Weather Flow Treatment Alternatives to Increase Plant Capacity Don Esping, Denny Parker, Jose Jimenez, Fenghua Yang, Tim Bate, Steve Arant June

2 Outline Background/Goals Bench Scale Testing Demonstration Facilities Testing Round 1 Simulated Wet Weather Round 2 Wet Weather Summary/Further Testing

3 Milwaukee MSD South Shore Water Reclamation Facility 24 Final Settling Tanks 28 Aeration Basins 16 Primary Settling Tanks Aerated Grit 1 screens

4 2020 Facilities Plan Increase capacity SSO - 5 year protection 300 to 450 mgd Pilot Tested Ballasted Sedimentation Study Objectives Demonstrate other auxiliary treatment technologies 300 mgd secondary treatment 150 mgd CEPT

5 Auxiliary Treatment Options Considered Process Chemical Chemically Enhanced Primary Treatment (CEPT) Testing Comments Yes Full-Scale Testing Ballasted flocculation (Actiflo No Previously tested CoMag Ballasted flocculation No Biological Biological Contact Treatment Yes Pilot-Scale Testing Bio-Actiflo No Insufficient project budget Filtration Deep Bed Filters No Cloth media No Compressible Media Yes Pilot-Scale Testing DRAFT 8/24/2010

6 Treatment Flow Routing Plant Influent (450 mgd) Primary Settling Tanks (150/300/300 mgd) Compressible Media Filtration (150 mgd) Existing Activated Sludge Process (300/300/300 mgd) Biological Contact Treatment (150 mgd) Disinfection (450 mgd) Flow routing and flow rates Compressible Media Filtration/Biological Contact / Chemically Enhanced Sedimentation

7 Demonstration Study Effluent Goals Item Units NPDES Permit Operations Contract Demonstration Study Daily Goals cbod 5 mg/l 30 a /45 b 15 a 35 TSS mg/l 30 a /45 b 15 a 35 Total Phosphorus mg P/L 1.0 a 1.0 a 1 Ammonia-Nitrogen mg N/L Seasonal 5 a 5 Fecal Coliform c (no./100 ml) a. Monthly average b. Weekly average c. Geometric mean

8 Bench-Scale Testing CEPT Cocktail for wet weather and chemical system sizing Biological Contact Treatment Bio-flocculation potential and kinetics ( MLSS and contact time) Simulation of coagulation and/or flocculation processes

9 Supernatant TSS, mg/l CEPT Bench-Scale Testing Coagulant Only 100 Coagulant and Flocculant Control 40 mg/l FeCl mg/l PAX 40 mg/l FeCl3 & 0.46 mg/l A210P 12.6 mg/l PAX & 0.46 mg/l A210P 40 mg/l FeCl3 & 0.4 mg/l CE mg/l PAX &0.4 mg/l CE9307

10 Supernatant COD, mg/l CEPT Bench-Scale Testing Coagulant Only Coagulant and Flocculant Diluted raw influent Control 40 mg/l FeCl mg/l PAX 40 mg/l FeCl3 & 0.46 mg/l A210P 12.6 mg/l PAX & 0.46 mg/l A210P 40 mg/l FeCl3 & 0.4 mg/l CE mg/l PAX &0.4 mg/l CE9307 COD SCOD FFCOD Demonstration Target 40 mg/l ferric chloride 0.5 mg/l anionic polymer

11 Biological Contact Treatment High rate biological process which relies on biological flocculation for colloidal & particulate removal No chemical addition required Effluent meets secondary treatment requirements RAS WAS

12 Biological Contact Treatment High rate biological process which relies on biological flocculation for colloidal & particulate removal No chemical addition required Effluent meets secondary treatment requirements Contact Tank Combined or Dedicated Clarifiers PE or Raw RAS Short HRT Contact Tank MLSS or RAS WAS

13 % Approach to TSS Residual Concentration Biological Contact Process Sizing Competing Interests Low MLSS» Low SLR» Less clarifiers Low MLSS» Reduced kinetics» Larger contact tank Site specific testing required 100% 80% 60% 40% 20% 0% Contact Time (min) Plant A Plant B DRAFT 8/24/2010

14 Supernatant TSS, mg/l Biological Contact Bench Scale Testing Flocculation Time, minutes

15 % Approach to Residual Particulate COD Biological Contact Bench Scale Testing 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Particulate COD = TCOD - SCOD(0.45 um filter) Contact Time (min) 500 mg/l 1,000 mg/l 1,250 mg/l 1,500 mg/l 2,000 mg/l MLSS Demonstration Target mg/l HRT minutes

16 CEPT Demonstration Full Scale ¼ existing primary settling tanks Wet weather SOR: 1500 gal/sf-d 40 mg/l ferric chloride and 0.5 mg/l anionic polymer Primary effluent sampler Influent sampler and ferric chloride feed location CES Primary Clarifiers 9-12 Polymer Feed/ Mixer Location

17 Biological Contact Treatment Demonstration 4000 gallon aerated plug flow reactor Bench Scale Settling Tests MLSS: mg/l HRT: minutes Bench testing for clarification Primary Influent Head Tank Tank 4 Tank 1 Tank 2 Return Sludge

18 Compressible Media Filter Demonstration WWETCO Rental Filtration rate gpm/sf Primary effluent and secondary effluent 2012/13 - Primary influent

19 Simulated Wet Weather Biological Contact Item Units 10/12/ /17/ /17/2011 Influent stream Blend of primary influent and secondary effluent MLSS mg/l Influent COD mg/l TSS mg/l BOD 5 mg/l TP mg/l Reactor 3 Contract time minutes Effluent TSS mg/l Reactor 4 Contact time minutes Effluent COD mg/l Effluent TSS mg/l Effluent TP mg/l Demonstration Target MLSS mg/l HRT minutes

20 RAS RAS Total Suspended Solids, mg/l Simulated Wet Weather Compressible Media Diluted Primary Effluent Filtered Effluent

21 Soluble COD, mg/l RAS 5.5 Diluted Primary Effluent scod 135 RAS Filtered scod Simulated Wet Weather Compressible Media RAS addition did not improve soluble COD removal Ferric addition not required Test filtration rates of 5-10 gpm/sf

22 5/6/12 0:00 5/6/12 3:00 5/6/12 6:00 5/6/12 9:00 5/6/12 12:00 5/6/12 15:00 5/6/12 18:00 5/6/12 21:00 5/7/12 0:00 5/7/12 3:00 5/7/12 6:00 5/7/12 9:00 5/7/12 12:00 5/7/12 15:00 5/7/12 18:00 5/7/12 21:00 5/8/12 0:00 Flow, mgd Wet Weather Testing - May 7, CES and BC CMF Operation

23 May 7, 2012 Test CEPT (CES) SOR 2750 gal/sf-d Polymer mixer malfunction Biological Contact MLSS 1600 mg/l HRT = 16 and 22 minutes CMF Filtration rate of 7.5 gpm/sf

24 6:00 7:30 9:00 10:30 12:00 13:30 15:00 16:30 18:00 19:30 21:00 22:30 0:00 Total Suspended Solids, mg/l May 7, 2012 Wet Weather Testing - TSS Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent

25 6:00 7:30 9:00 10:30 12:00 13:30 15:00 16:30 18:00 19:30 21:00 22:30 0:00 BOD5(influent) or CBOD5(effluent), mg/l May 7, 2012 Wet Weather Testing BOD Time BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent

26 6:00 7:30 9:00 10:30 12:00 13:30 15:00 16:30 18:00 19:30 21:00 22:30 0:00 Ammonia Nitrogen, mg N/L May 7, 2012 Wet Weather Testing - Ammonia Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent

27 6:00 7:30 9:00 10:30 12:00 13:30 15:00 16:30 18:00 19:30 21:00 22:30 0:00 Total Phosphorus, mg P/L May 7, 2012 Wet Weather Testing TP Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent

28 6:00 7:30 9:00 10:30 12:00 13:30 15:00 16:30 18:00 19:30 21:00 22:30 0:00 Chemical Oxygen Demand, mg/l May 7, 2012 Wet Weather Testing COD Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent

29 6:00 7:30 9:00 10:30 12:00 13:30 15:00 16:30 18:00 19:30 21:00 22:30 0:00 Soluble Chemical Oxygen Demand, mg/l May 7, 2012 Wet Weather Testing Soluble COD Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent

30 6:00 7:30 9:00 10:30 12:00 13:30 15:00 16:30 18:00 19:30 21:00 22:30 0:00 Soluble Phosphorus, mg P/L May 7, 2012 Wet Weather Testing Soluble P Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent

31 May 7, 2013 Test Temperature = 10.5 C CEPT SOR 1900 gal/sf-d Ferric chloride 50 mg/l as FeCl 3 Polymer 2 mg/l Biological Contact MLSS 1700 mg/l HRT = 17 and 23 minutes CMF Equipment Malfunction

32 9:00 10:30 12:00 13:30 15:00 16:30 18:00 Total Suspended Solids, mg/l May 23, 2013 Wet Weather Testing - TSS Time BC/CES Influent BC (HRT=17 min ) BC (HRT=23 min) CES Effluent

33 9:00 10:30 12:00 13:30 15:00 16:30 18:00 BOD5 (influent) or CBOD5 (effluent), mg/l May 23, 2013 Wet Weather Testing - BOD Estimated from TSS 10 0 < 10 mg/l Time BC/CES Influent BC (HRT=17 min ) BC (HRT=23 min) CES Effluent

34 9:00 10:30 12:00 13:30 15:00 16:30 18:00 Ammonia Nitrogen, mg N/L May 23, 2013 Wet Weather Testing - Ammonia Time BC/CES Influent BC (HRT=17 min ) BC (HRT=23 min) CES Effluent

35 9:00 10:30 12:00 13:30 15:00 16:30 18:00 Total Phosphorus, mg P/L May 23, 2013 Wet Weather Testing - TP Time BC/CES Influent BC (HRT=17 min ) BC (HRT=23 min) CES Effluent

36 SVI, ml/g Biological Contact Treatment Sludge Quality 110 May 23, 2013 Wet Weather Flow SVI Measurements :00 14:00 16:00 Biological Contact Tank 4 (23 min) Aeration Basin 4

37 Solids Loading Rate, lb/sf-d Biological Contact Treatment Sludge Quality April 23, 2013 SVI Activated Sludge Biological Contact = 68 ml/g = xx ml/g MLSS, g/l Activated Sludge Biological Contact

38 Wet Weather Testing to Date Item Chemically Enhanced Primary Treatment Biological Contact Treatment Compressible Media Filtration Events Effluent Quality CBOD 5 <20 10 <20 ESS 20 <10 <20 NH 3 -N In = Out 1-2 mg/l reduction In = Out TP <1 < 1 <1 Comments 50 mg/l FeCl 3 Polymer = 2 mg/l min HRT MLSS mg/l SVI same as mainstream 7.5 gpm/sf

39 Future Testing Additional auxiliary treatment testing June 13, 2013 completed 3 additional wet weather events Biological contact settling characteristics testing Disinfection testing

40 Thank you