EFLO MBR - Membrane Bioreactor Technical Data

AutoScreenInletPumpStationAeration TankFine BubbleAir Di?usionMBR TankMembranes &Air ScouringTreatedWaterAirBlowerPermeatePumping• Submerged Flat Sheet Membranes• VDF Permeate Suction Pumps.• Nominal Pore Dia. 0.08µm• PVDF Membrane.• Normal Flux 0.7 m/d• Operating MLSS 7,000 - 18,000 mg/l• Membrane Working Area 1.4 sq.m• Membrane Frames : ANSI 316 st. st.• E?uent Quality BOD, TSS, NH3-N: < 3 mg/l, < 2 mg/l, < 1 mg/l• Very compact treatment plants• Eflo Constant Transfer avoids need for Equalisation Tanks• Low sludge production• Hair and Fibre Reinforced Biomass HFRB Removal• Clean In Place CIP Membranes.• Auto Air Di?user Purging• Extended Membrane Life• 50 - 50,000 m3 per day• Ready to Run Package Plants Factory Built• Site Built Large Plants using Insitu Concrete Tanks.The Membrane Bio Reactor MBR is a development of the well known activated sludge process. Remarkably the MBR dispenses with the need for both Primary Settlement and Final Settlement Tanks. Further, the foot print of the plant is significantly reduced whilst the final e?uent quality is improved far beyond that of a conventional WWTP with Tertiary Treatment.The limiting factor in a conventional activated sludge plant is the performance of the final settlement tanks. If the biomass concentration in the aeration tank is allowed to rise too high, typically above 3500 mg/l, then the settlement tank will fail, allowing solids to pass out of the plant with the e?uent.In the MBR plant, membranes in the micro/ultra filtration range are used to separate the biomass from the treated water. This allows the biomass concentration in the aeration tank to be raised significantly, reaching 18,000 mg/l whilst retaining an F/M ratio of 0.1 - 0.15. Therefore, the biological treatment volume can therefore be reduced five or six fold. This significant reduction in volume plus the elimination of the settlement tanks makes the MBR very compact.E?o International Ltd, the UK based wastewater treatment technologies provider, o?er innovative treatment solutions.Eflo has designed & installed treatment plants in the Middle East, Africa, Caribbean the Indian Ocean islands over a period of more than 30 years.As well as the E?oMBR, Membrane Bio Reactor, Eflo o?ers a range of other waste water treatment products for both sewage, industrial waste water & water re-use.Eflo is part of the Concorde Corodex Group of companies and through this group can o?er bespoke potable water treatment systems including River Water Treatment and Seawater Reverse Osmosis. Water treatment plants for small communities to large towns.E?oCTE?oSAFE?oSBR E?oMBR E?oDAF E?oSEP E?oGREY Extended AerationSubmerged Aerated FilterSequential Batch ReactorMembrane Bio- ReactorDissolved Air FloatationOil Water Separator Grey Water Re cycling Membrane PrincipleTypical Example of Treated Water Quality.Crystal Clear. < 3 : < 2 : < 1 ( BOD : TSS : NH3-N)Air ScouringBubblesActivatedSludgeParticlePermeateFlowMembrane MembraneMembraneSupportPanelPermeateFlowTreatedWaterEven Distribution of MBR Tank Air Scouring Pattern above Membrane Frames. On left are the Air Di?user Auto Purging ValvesThe diagram on the left shows the principle of operation at the membrane surface. The membranes used in the E?oMBR are the ?at sheet type. The individual membranes are securely held within a stainless steel frame which is mounted above an air di?user system, also in stainless steel.Multiple membrane sheets are located within each frame and multiple frames are used in the MBR tanks. The treated water or permeate - is drawn through the membranes by use of a suction pump and delivered to the treated water tank via a series of polyurethane tubes, header pipes and a ring main.The E?oMBR uses membranes at the ultra / micro ?ltration range. At this range many bacteria and some virus are rejected and not allowed to pass out with the treated water. This provides a signi?cant level of disinfection in the treated water. Minimal or no chlorination is required in the treated water.The treated water is therefore very suitable for many uses such as unrestricted irrigation, WC ?ushing or aquifer recharge. The treated water can be polished further to a potable quality by the employment of RO Reverse Osmosis membranes.Ultra FiltrationReverseOsmosisNano FiltrationMicro FiltrationEFLO MBRCryptosporidiumColiformBacteriaPesticide, Organic MaterialVirusTrihalomethanesNa+ , Cl- IonsCa2, Mg2, So42 Ions0.001 micron 0.001 micron 0.001 micron 0.001 micron 0.001 micronMembraneTypeSeparation TargetSizeMembrane TypesTypical Control Room on larger EFLOMBR PlantsEFLOMBR 7,500 m3/dayEFLOMBR Operation, Maintenance and ReliabilityThe MBR is a very compact treatment plant that produces an exceptional quality of treated water by combining conventional treatment with ultra ?ltration technology.Compared with conventional processes, the MBR with its advance in treated water quality has resulted in the inclusion of more expensive, technically advanced components and more complex control systems.The membranes employed are ?lters and are operated at a speci?c ?ux rate. This means there is an absolute maximum design ?ow the MBR can be operated at. Unlike conventional process, the MBR cannot be hydraulically overloaded. Careful consideration must be given to the design in?ow rate. Peaks in daily in?ow are usual and the E?oMBR accommodated these using the E?o Constant Transfer process. This avoids the requirement of equalisation tanks and keeps the plant footprint to a minimum.The E?oMBR operates automatically under PLC. The smaller plants have a HMI touch screen on the control panel and the larger plants have dedicated control & operator rooms. The plants have extensive process instrumentation to monitor the critical components in order to ensure the membranes are operated under optimal conditions.The information logged by this instrumentation provides the necessary data for the membrane cleaning programme. The E?oMBR uses clean in Place CIP for the membrane cleaning and uniquely, employees biomass screening to minimise or avoid theremoval membrane frames for cleaning. In order to protect the membranes, very carefully designed inlet works are provided, including ?ne screening, grit and fat-oilgrease (FOG) removal.In spite of the ?ne inlet screens, E?o also include Biomass Screens which are critical to remove the build up of Hair and Fibre Reinforced Biomass HFRB. This is a constant problem in all MBR processes and causes severe fouling of the membranes, irrespective of the size of the inlet screens. E?o include their specialized Biomass Screens in all their MBRs to prevent fouling and maintain a long membrane life. These screens handle the full design ?ow as well as the full recirculated mixed liquor.In all but the smallest E?oMBR plants, an Aeration and MBR tank is employed. This allows E?o to use, energy e?cient, ?ne bubble air di?usion for the biological oxidation.The MBR tank employee medium bubble air di?usion for the air scouring required to prevent biomass fouling of the membrane sheets. These air di?users are automatically reverse purged six times daily to prevent clogging.Typical view of EFLOMBR Inlet works, 6+3 mm screens, FOG & Grit removalDESIGNED & ENGINEERED BY :EFLO INTERNATIONAL LTD.The Colin Sanders Innovation Centre,Mewburn Rd., Banbury, OX16 9PA, UKTel + 44 (0) 1295 817623Fax + 44 (0) 872 115 6890Email: info@eflo.comwww.eflo.comEFLOMBR Ancillary Equipment and ProcessesRoad tanker discharge facility. Facility includes four tanker discharge points with sealed suction hoses to prevent escape of odor. The odor is scrubbed clean by a Bio Scrubber followed by a polishing chemical scrubber. The discharge facility also has a 6 mm auto screen, a bu?er tank and pumping station to deliver the waste water to the adjoining E?oMBR.The Bio Scrubber is the primary odor control unit and saves on chemical usage over the conventional chemical scrubbers.Typical Motor Control Centre for the larger E?oMBR treatment plants, containing PLCs, VFD motor controllers and main switchgear. Clean, air conditioned roomBlower Packages within acoustic enclosures delivering air to the Aeration Tank ?ne bubble air di?users and the MBR Tank air scouring. Roots type blowers coupled to VFD motors for slow start & stop as well as linking blower speed to aeration tank oxygen concentrationsEFLO.HDT2.006.0211