Membranes Bioreactors Technology at U.S. Naval Air Station Sigonella Sicily

NAVAL AIR STATION SIGONELLA SICILY Presentation contents  Introduction to NASSIG and OCONUS  Introduction to Sigonella UEM Wastewater  Permits and standard  Wastewater treatment plant configuration – NAS 1  Wastewater treatment plant configuration – NAS 2  MBR features  MBR management aspects: advantages and disadvantages  Conclusions and future prospects INTRODUCTION NASSIG AND OCONUS Production Division Produce and distribute 530K gallons potable water per day Operate two Wastewater Treatment Plants Distribute MW average load ( MW peak) of electricity Maintain 630 pieces of equipment and provide equipment operations to 37 tenant commands Execution of 6.8K E/U/R and PM work orders per year Environmental Division Manage, recycle, and dispose of 100k lbs of Hazardous Waste annually Compliance for four Overseas Drinking Water Systems (including water treatment) and two permitted Wastewater Treatment Plants. Coordinating a Vapor Intrusion Study in support of P8 Hangar occupancy. Preparing to execute AFFF Removal and Replacement ( Fire Trucks/ Fixed systems) in support of ODASN (EIE) requirements to remove, dispose of and replace AFFF that does not meet maximum permissible limit of 800 ppb for PFOS and PFOA. Activated Sludge Treatment Membrane Biological Reactor (AST) (MBR) WASTEWATER TREATMENT PLANT CONFIGURATION – NAS AST Tank Pre-treatment Equalization tank 2 Permeate tank MBR Bioreactor tank MBR tank 5 MBR TECHNICAL FEATURES MBR System operation – equipment and tools MBR Anoxic and aerobic phases set up for biological process Description Number Type of Installed unit Service operation power Rotary screen Continuous 0,18 kW Continuous Membrane blower 2+ Inverter 22 kW Continuous Bioreactor blowers 2+ Inverter 15 kW Continuous Mixer Continuous 2,9 kW Continuous Sludge pump Continuous 2,5 kW Continuous Permeate extraction pump Inverter 3 kW Continuous Backwashing pump Continuous 1,1 kW Occasional Chemicals and pump Continuous 0,5 kW Occasional AEROBIC PHASE ANOXIC PHASE Description Number Min maintenance frequency Type of maintenance MIN MAX MIN MAX Redox potential probe Oxygen dissolved probe Monthly and semiannual Tn (hours) 3 Cleaning and calibration pH probe Td (hours) 5 7, Suspended solid probe Kg SSVT/ mc 8 12 8 Pressure meter blower Semiannual Calibration Flow meter blower Semiannual Calibration DO (mg/l) 2 2 <0,5 <0, Pressure meter membrane Semiannual Calibration pH 7,2 8,5 7,5 8, Flow meter membrane Semiannual Calibration Blowers ON ON OFF OFF Level transmitter Monthly and semiannual Cleaning and calibration Mixer OFF OFF ON ON.