Ballasted Activated Sludge Demonstration Study SEPTEMBER 30, 2016
Agenda Riverbend WRP Expansion Project Background Ballasted Activated Sludge Process Overview Special Equipment Overview Peninsula WRP Demonstration Study Filename.ppt/2
Riverbend Water Reclamation Plant Expansion to 4 mgd Project
Riverbend WRP Expansion to 4 mgd Goals: Provide AADF capacity of 4 mgd and P2HF capacity of 16 mgd Plan for a build-out AADF capacity of 10 mgd Increase treatment process performance and reliability Filename.ppt/4
Riverbend WRP Filename.ppt/5 Existing Riverbend WRP 2 mgd
Filename.ppt/6 Riverbend WRP Facility Plan with conventional BNR
Filename.ppt/7 Riverbend WRP Facility Plan with Ballasted Activated Sludge
Ballasted Activated Sludge Process Overview
30 3,000 SLR MLSS Q Flow RAS WAS Filename.ppt/9 Typical Secondary Treatment System
Clarifiers present secondary treatment bottlenecks 100 Solids Flux, ppd/sf 90 80 70 60 50 40 30 20 SOR=1,260 gpd/sf SVI=180 SVI=150 SVI=120 SVI=100 10 0 0 5000 10000 15000 20000 25000 Filename.ppt/10 Solids Concentration, mg/l
Flocs can be ballasted to increase settling velocity Filename.ppt/11 Floc without magnetite Floc with magnetite
BioMag uses magnetite as ballasting agent Filename.ppt/12 Readily available iron ore High specific gravity Hydrophobic Magnetic
Filename.ppt/13 BioMag Settling Demonstration
Ballasted activated sludge removes clarifier bottlenecks 100 Filename.ppt/14 Solids Flux, ppd/sf 90 80 70 60 50 40 30 20 10 0 SOR=1,260 gpd/sf 0 5000 10000 15000 20000 25000 Solids Concentration, mg/l
Ballasted activated sludge removes clarifier bottlenecks 100 90 80 SOR=1,260 gpd/sf Filename.ppt/15 Solids Flux, ppd/sf 70 60 50 40 30 20 10 0 0 5000 10000 15000 20000 25000 Solids Concentration, mg/l
70+ 3,000 6,000+ Polymer 30 SLR 2Q MLSS Q Flow RAS WAS Magnetite Recovery Filename.ppt/16 Magnetite Recycle Magnetite Feed WAS BioMag Ballasted Activated Sludge
Ballasted Activated Sludge Equipment Overview
Filename.ppt/18 Magnetite Feed and Recovery Equipment
Filename.ppt/19 Shear mills dislodge magnetite from the biological floc
Recovery drums separate magnetite from the waste sludge Stationary Magnetic Array Magnetite Ballasted Waste Waste Filename.ppt/20
Demonstration Study at Peninsula WRP
TCEQ required validation under warm weather conditions TCEQ 217 innovative technology requirements: Approval request Pilot or demonstration study 2-year performance bond Filename.ppt/22 BioMag Full-scale Installations
Peninsula WRP was the best location for the Demonstration 5-miles from Riverbend WRP Similar wastewater characteristics Similar configuration as proposed improvements Peninsula WRP Riverbend WRP Current flows were within Evoqua s pilot unit capacity Filename.ppt/23
Filename.ppt/24 Peninsula WRP operates with and AO configuration
Filename.ppt/25 Peninsula WRP has a rated capacity of 0.94 mgd
Filename.ppt/26 BioMag Demonstration Equipment
BioMag Demonstration Study Goals 1. Ability to meet effluent quality 2. Process configuration and aeration basin parameters 3. Clarifier peak flow parameters 4. Filter effluent quality from clarifiers 5. Establish magnetite and chemical doses Filename.ppt/27
Objective No. 1: Demonstrate ability to meet effluent quality Parameter 30-day Average Discharge Limit Daily Max Pilot Operation Data 30-day Average Daily Max BOD, mg/l 5 20 TSS, mg/l 12 40 NH3-N, mg/l 2 10 TP, mg/l 1 4 E. coli, CFU/100 ml 126 394 Filename.ppt/28
Objective No. 1: Demonstrate ability to meet effluent quality 2.0 5 1.5 1.0 0.5 TSS (mg/l) 4 3 2 1 0.0 0 Filename.ppt/29 Jan-16 Feb-16 Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16 Jan-16 Feb-16 Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16 Sep-16 Oct-16 Sep-16 Oct-16 Discharge NH3-N (mg/l)
Objective No. 1: Demonstrate ability to meet effluent quality Parameter 30-day Average Discharge Limit Daily Max Pilot Operation Data 30-day Average Daily Max BOD, mg/l 5 20 < 2 < 2 TSS, mg/l 12 40 < 1 4* NH3-N, mg/l 2 10 0.2 0.6 TP, mg/l 1 4 0.2 0.5 E. coli, CFU/100 ml 126 394 < 1 < 1 Filename.ppt/30
Goal No. 2: Demonstrate aeration basin parameters Study Goals: Total MLSS > 8,000 mg/l MLSS > 4,000 mg/l MLVSS > 3,000 mg/l Max OLR > 30 lbs/kcf SRT < 8 days One basin in service Concentration (g/l) 16 14 12 10 8 6 4 2 0 TSS Filename.ppt/31 Jan-15 Mar-15 May-15 Jul-15 Sep-15 Nov-15 Jan-16 Mar-16 May-16 Jul-16 Sep-16 VSS
Goal No. 3: Demonstrate clarifier peak flow parameters Filename.ppt/32 Column Settling Test Results
Goal No. 3: Demonstrate clarifier peak flow parameters Parameter Demonstration Goal Clarifier Stress Test Surface overflow rate, gpd/sf 1,200 2,200 Solids loading rate, ppd/sf > 30 140 Sec. Effluent TSS, mg/l -- 2.4 Sec. Effluent turbidity, NTU -- 1.7 Sec. Effluent UVT, % -- 79.5 Sec. Effluent BOD, mg/l -- ND Filename.ppt/33 Hydraulic stress test reached 4 mgd with one basin and one clarifier out of service
Goal No. 3: Demonstrate tertiary effluent quality 10.0 9.0 8.0 7.0 Turbidity (NTU) 6.0 5.0 4.0 3.0 2.0 1.0 0.0 Filename.ppt/34 8/1/16 8/8/16 8/15/16 8/22/16 8/29/16 9/5/16 9/12/16 9/19/16 9/26/16 10/3/16 10/10/16 10/17/16 10/24/16 10/31/16 Type I Average
Goal No. 4: Establish magnetite and chemical doses Parameter Typical Pilot Results Magnetite to MLSS ratio 1:1 0.75:1 Polymer dose, mg/l 0.5 to 1.5 0.6 Filename.ppt/35
Demonstration study provided valuable lessons EBPR achieved with BioMag Polymer addition is required Achieved filter effluent quality Filament bloom did not affect effluent quality Surface wasting Process Magnetite recovery Operations Good headworks and WAS screens are required to protect shear mills from debris High quality level probes, flow sensors, pressure gauges that are designed for wastewater treatment. High quality functioning HMI control system with easy to follow accurate system schematic and data input controls Filename.ppt/36
Ballasted Activated Sludge Demonstration Study SEPTEMBER 30, 2016