Comparison of Three Wet Weather Flow Treatment Alternatives to Increase Plant Capacity
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1 CSWEA 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 May
2 Milwaukee MSD South Shore Water Reclamation Facility 24 Final Settling Tanks 28 Aeration Basins 16 Primary Settling Tanks Aerated Grit 1 screens
3 Outline Background/Goals Bench Scale Testing Demonstration Facilities Testing Round 1 Simulated Wet Weather Round 2 Wet Weather Conclusions/Further Testing
4 Project Background/Goals 2020 Facilities Plan Increase wet weather treatment capacity from 300 mgd to 450 mgd SSO Level of Protection 5 year Ballasted flocculation pilot tested Bio-ballasted flocculation Bench tested Project Goals Demonstrate other non- proprietary processes: Chemically Enhanced Sedimentation (CEPT) Biological Contact Treatment Compressible Media Filtration
5 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
6 Demonstration Study Effluent Goals Item Units NPDES Permit Operations Contract Demonstration Study Daily Goals Total BOD 5 mg/l 30 a /45 b 15 a 35 Total Suspended Solids 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
7 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
8 CEPT Bench- Scale Testing Supernatant TSS, mg/l Coagulant Only Coagulant and Flocculant Demonstration Target 40 mg/l ferric chloride 0.5 mg/l anionic polymer 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 CE Supernatant COD, mg/l 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
9 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 RAS Tank MLSS or RAS WAS WAS
10 Biological Contact Bench Scale Testing Supernatant TSS, mg/l % Approach to Residual Particulate COD 100% 90% 80% 70% 60% 50% 40% 30% % % 0% Particulate COD = TCOD - SCOD(0.45 um filter) Contact Time (min) mg/l 1,000 mg/l 1,250 mg/l 1,500 mg/l 2,000 mg/l Flocculation Time, minutes Demonstration Target MLSS mg/l HRT minutes
11 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
12 Biological Contact Treatment Demonstration 4000 gallon aerated plug flow reactor Bench Scale Settling Tests MLSS: mg/l HRT: minutes Bench testing for clarification Plant Influent Head Tank Tank 4 Tank 1 Tank 2 Return Sludge
13 Compressible Media Filter Demonstration WWETCO Rental Filtration rate gpm/sf Primary effluent and secondary effluent Primary influent
14 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
15 Simulated Wet Weather Compressible Media 120 Total Suspended Solids, mg/l RAS RAS Diluted Primary Effluent Filtered Effluent
16 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 Soluble COD, mg/l RAS RAS Diluted Primary Effluent scod Filtered scod
17 Wet Weather Testing - May 7, CES and BC Flow, mgd /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 CMF Operation
18 Wet Weather Testing - TSS :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 Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent
19 Wet Weather Testing BOD 70 Biochemical Oxygen Demand, mg/l :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 Time BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent
20 Wet Weather Testing COD 200 Chemical Oxygen Demand, mg/l :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 Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent
21 Wet Weather Testing Soluble COD Soluble Chemical Oxygen Demand, mg/l :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 Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent
22 Wet Weather Testing - Ammonia 9 8 Ammonia Nitrogen, mg N/L :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 Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent
23 Wet Weather Testing Total Phosphorus Total Phosphorus, mg P/L :00 7:30 9:00 10:30 12:00 13:30 15:00 Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent 16:30 18:00 19:30 21:00 22:30 0:00
24 Wet Weather Testing Soluble Phosphorus Soluble Phosphorus, mg P/L :00 7:30 9:00 10:30 12:00 13:30 15:00 Time BC/CES Influent BC (HRT=16 min ) BC (HRT=22 min) CMF Influent CMF Effluent CES Effluent 16:30 18:00 19:30 21:00 22:30 0:00
25 Conclusion to date Biological Contact Treatment Achieved lowest effluent concentrations Met all demonstration study effluent goals MLSS: 1600 to 2000 mg/l at 15 minute HRT. Compressible Media Filtration Effluent TSS, BOD 5, TP < effluent goals at 7.5 gpm/sf. CEPT Inconclusive due to equipment malfunctions Ongoing Testing 4-5 Additional wet weather events Biological contact settling characteristics testing Disinfection testing
26 Thank you
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