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Energy Efficiency in MBR Systems

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Presentation on theme: "Energy Efficiency in MBR Systems"— Presentation transcript:

1 Energy Efficiency in MBR Systems
Brian Codianne

2 Designing Enviroquip® MBR Systems
Energy Efficiency - Goals and Strategies Energy Efficiency Energy Expended per volume of water treated Units of measure: kWh/m3

3 Designing Enviroquip® MBR Systems
Energy Efficiency - Goals and Strategies Impact of Improving Energy Efficiency 1 kwh/m^3 saves $110,000

4 MBR Loads vs. Non-MBR Loads
Designing Enviroquip® MBR Systems Energy Efficiency - Goals and Strategies MBR Loads vs. Non-MBR Loads MBR Loads Loads based on the rate of permeate production Permeate Pumps MBR Scour Air Blowers Non-MBR Loads Loads needed for support of biology, independent of permeate production Mixers MLR Pumps Process Air Blowers

5 Integration of New Kubota Products
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Integration of New Kubota Products SMU Scour Air Energy Usage KUBOTA = 0.22 – 0.40 kWh/m3 EQ MBR = 0.13 – 0.18 kWh/m3 KUBOTA = 0.73 kWh/m3 Nominal power requirements for submerged membrane units (SMU) only. Actual power requirements are system dependent. 1989 2001 EK SMU (Double Deck) (Type 510 Cartridge) RW SMU (Double Deck) (Type B2-515 Cartridge) SP SMU (Modules) ES SMU (Single Deck) 5

6 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies Impact of SMU Evolution on Energy EK-400 EW-400 RW-400 gpd at 14.7 gfd 50700 79280 91960 kWh/m3 at 14.7 gfd .364 .275 .230 Nominal power requirements for submerged membrane units (SMU) only. Actual power requirements are system dependent. 6

7 Provide Aeration and Permeate Turndown for Off-Design Point Operations
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Provide Aeration and Permeate Turndown for Off-Design Point Operations Energy ProTM Configuration Proportional Aeration Configuration

8 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies Energy ProTM MBR Zones Automatically Brought Online to Incrementally Match Demand PA AX SB FC MBR 1/3 of capacity at low flow 2/3 of capacity at medium flow INF Full capacity at high flow EFF

9 Proportional Aeration
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Proportional Aeration MBR Low Intensity at Low Flux Medium Intensity at Medium Flux High Intensity at High Flux .5Q Q 2Q 9

10 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies Impact of Proportional Aeration on SMU Energy EK-400 EW-400 RW-400 gpd at 14.7 gfd 50700 79280 91960 kWh/m3 at 14.7 gfd (Kubota) .364 .275 .230 Nominal power requirements for submerged membrane units (SMU) only. Actual power requirements are system dependent. kWh/m3 at 14.7 gfd (EQ Prop Air) .214 .167 .144 10

11 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies 1Q 2Q 3Q 6:00 12:00 18:00 24:00 PA FC MBR AX MBR SB AX INF MBR Low Intensity PA EFF Medium Intensity High Intensity

12 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies Dundee, MI – Efficiency and Turndown Avg. SBR Energy Usage (0.80kWh/m3) Enviroquip MBR Energy Usage Actual Total Plant Energy Usage at Design AAF (1.5 MGD)

13 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies Delphos, OH – Efficiency and Turndown (Energy Audit Excerpt) .

14 Maximizing Efficiency at Design Points
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Maximizing Efficiency at Design Points Pump Assisted Gravity Configurations

15 Permeate Collection Methods
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Permeate Collection Methods P Pumped Gravity Pumping Energy to Convey Permeate Low SWD No Pumping Costs High SWD 15

16 Pump Assisted Gravity (PAG)
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Pump Assisted Gravity (PAG) PAG is ~25% more energy efficient than gravity or pumped systems Lower blower discharge pressure Pumps only used to resolve air lock/high TMP P 16

17 Use system modeling to optimize controls and hydraulic balancing
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Use system modeling to optimize controls and hydraulic balancing EQProSim™ Inputs Diurnal Flows Working Volume (EQ) Permeate Capacity Output Minute to Minute Status Total Run Times Accurate Energy Prediction

18 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies EQProSim™ Design Optimization Determine Optimum EQ volume for diurnal flows (hydraulic balance, energy) Prediction of energy consumption at design and off-design points Cost-benefit analysis of using various configurations (EnergyProTM, Proportional Aerations, etc.)

19 Incorporating evolving technologies and configurations
Designing Enviroquip® MBR Systems Energy Efficiency – MBR Strategies Incorporating evolving technologies and configurations High Efficiency Blowers Turbo and next-generation PD blowers 15-30% less energy than traditional PD blowers Added Benefits Integrated VFDs (lower MCC cost) Integrated pressure and flow sensors Smaller footprint (less building costs)

20 Designing Enviroquip® MBR Systems
Energy Efficiency – MBR Strategies MBR System Energy Usage +40% Efficiency ?? +20% Efficiency +40% Efficiency 2001 EK SMU (DD) Optimize SRT/MLSS Biomonitoring EW SMU Proportional Aeration Pump-Assisted Gravity RW SMU Energy Pro™ PAD-K SP SMU ECOBLOX™ microBLOX™

21 Designing Enviroquip® MBR Systems
Energy Efficiency – Overall Strategies Improving Non-MBR Efficiencies Mixers Optimizing mixer speeds/energy input to match process needs Ovivo LM Mixers Mixed Liquor Recycle Installing turn-down in pumping rates for seasonal changes in flows Process Aeration Maximizing fine bubble SOTE to reduce aeration energy Minimizing energy burned through control valves (basin SWDs) Improve blower/FCV interactions – Most Open Valve Control

22 Designing Enviroquip® MBR Systems
Energy Efficiency – Theory vs. Reality Compounding Factors Running at higher than necessary DO If pre-aeration basin DO is 6 mg/l instead of 2 mg/l – 84% more energy consumption Running at a higher aeration header set point than necessary In a 16’ SWD basin, each additional .1 psig = 1.25% more energy In an 8’ SWD basin, each additional .1 psig = 2.6% more energy Balancing differing basin SWDs with FCVs on the same aeration headers First basin at 16’ + second basin at 15’ = 6% expended energy across FCV First basin at 10’ + second basin at 9’ = 10% expended energy across FCV First basin at 16’ + second basin at 8’ = 87% expended energy across FCV Inability to turn-down mixed-liquor recycle flow rates MLR rate based on daily Q total. Operating at 50% capacity = need for 50% of MLR Operating with less efficient equipment Older PD blowers compared to newer turbofan blowers = 10% - 30% additional energy

23 Designing Enviroquip® MBR Systems
Energy Efficiency – Designing for Reality Analysis of Energy-Related Alternatives Cost/benefits of: Energy Pro™ and Proportional Aeration Configurations Segregation of aeration systems by operating depths Installation of mixed liquor recycle flow turn down Installation of mixers sized for basin Utilization of higher-efficiency motors and technologies Utilize Ovivo as a Design Resource

24 Senior Technologist, MBR Systems
Thank You Brian Codianne Senior Technologist, MBR Systems


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