1. Deborah Helstrom, P.E. Industrial Permits Team Wastewater Permitting Section 512-239-6705 dhelstro@tceq.state.tx.us 217.158 Membrane Bioreactors Treatment Systems (MBR)

2. Combination: Activated Sludge Membrane filtration (replaces secondary clarifier) (replaces secondary clarifier) Membrane Bioreactors (MBR)

3. Ultrafiltration Membranes

5. Hollow Fiber Membranes

6. Flat Plate Membranes

7. Other Configurations

8.  Advantages Smaller Footprint Smaller Footprint High Quality Effluent High Quality Effluent Automatic Control Automatic Control Less Sludge Less Sludge  Disadvantages Capitol Costs Capitol Costs Energy Costs for Aeration and Scouring Energy Costs for Aeration and Scouring Highly Variable Flow require Equalization Highly Variable Flow require Equalization Membrane Bioreactors (MBR)

9. CBOD5<5 mg/lCBOD5<5 mg/l TSS<1 mg/lTSS<1 mg/l Ammonia<1 mg/lAmmonia<1 mg/l Total Nitrogen (w/pre-anoxic zone)<10 mg/lTotal Nitrogen (w/pre-anoxic zone)<10 mg/l Total Nitrogen (w/pre-anoxic andTotal Nitrogen (w/pre-anoxic and post-anoxic zone)<3 mg/l post-anoxic zone)<3 mg/l Total Phosphorus (with chemical addition)Total Phosphorus (with chemical addition) <0.2 mg/l (typical) <0.05 mg/l (achievable)<0.2 mg/l (typical) <0.05 mg/l (achievable) Total Phosphorus (with Bio-P removal)Total Phosphorus (with Bio-P removal) <0.5 mg/l<0.5 mg/l Turbidity <0.2 NTUTurbidity <0.2 NTU Bacteriaup to 6 log removal (99.9999%)Bacteriaup to 6 log removal (99.9999%) Membrane Bioreactors (MBR) Expected Performance

10.  Currently Compiling Surveys from Vendors of Membranes to Develop Design Criteria  Concerns Prevention of Fouling Prevention of Fouling Adequate aeration at high MLSS concentrations Adequate aeration at high MLSS concentrations Achievable rate of flow through membranes Achievable rate of flow through membranes Adequate pretreatment i.e. fine screening Adequate pretreatment i.e. fine screening Hydraulics Hydraulics Ensure Integrity Ensure Integrity Foam Control Foam Control Warranty Warranty Nutrient Removal Nutrient Removal Membrane Bioreactors (MBR)

11. Membranes Nominal Pore Size Absolute Pore Size Pretreatment Fine Screen (Type, Size) Primary clarifier, Grit Removal, Oil and Grease Removal (When required) Membrane Bioreactors (MBR) Results of Survey, Literature and Other State Regulations

12. Operation Gross Flux Rate @ 20 C Net flux rate @ 20 C Operational Range for TMP Maximum Operational TMP Operational Range of MLSS Concentration in Bio Reactor Operational Range of MLSS Concentration in Membrane Tank Operational control parameters used and range of values (Turbidity, SRT, DO, TMP, ORP) (Turbidity, SRT, DO, TMP, ORP) Amount of air used per square foot of membrane Method of Integrity Testing (i.e. Turbidity) Method of Foam Control Membrane Bioreactors (MBR) Results of Survey, Literature and Other State Regulations

13. Maintenance clean MethodFrequency Chemical clean Frequency Chemicals used Concentrations Membrane Bioreactors (MBR) Results of Survey, Literature and Other State Regulations

14. Redundancy N+1 or other method Peak Flow Peak Ratio which requires Equalization RAS rate (#Q) Hydraulics Head required for Gravity Controls Method of backup for controls Warranty Membranes, other equipment and process Membrane Bioreactors (MBR) Results of Survey, Literature and Other State Regulations

15. Engineering Report Required Engineering Report Required Common range of values Common range of values Justification for using parameters outside the common range Justification for using parameters outside the common range 2 year performance bond 2 year performance bond 217.158 Membrane Bioreactors Treatment Systems (MBR)

16. “So, You Decided to Build an MBR?: Tips to help optimize process performance”, Merlo, Rion et al, WE&T, www.wef.org/magazine November 2006. “So, You Decided to Build an MBR?: Tips to help optimize process performance”, Merlo, Rion et al, WE&T, www.wef.org/magazine November 2006. www.wef.org/magazine November 2006 www.wef.org/magazine November 2006 State of Washington, Department of Ecology, “Orange Book”, Sewage Treatment Design Criteria State of Washington, Department of Ecology, “Orange Book”, Sewage Treatment Design Criteria Water Environment Federation, Membrane Systems for Wastewater Treatment, 2006 Water Environment Federation, Membrane Systems for Wastewater Treatment, 2006 Manufacturers: Manufacturers: Huber, Koch, Kruger, Kubota, U.S. Filter, ZenonHuber, Koch, Kruger, Kubota, U.S. Filter, Zenon Membrane Bioreactors References