Condensate Polishing Brochure

GEA FiltrationProcess EngineeringDivisionCondensate PolishingIn most cases, condensate from evaporationplants is used as boiler feed water, process, coo-ling, and rinsing water or is directly dischargedinto a drainage ditch. For this purpose, thequality of the condensate must be improvedonce again and it must be purified. Purificationby reverse osmosis is relatively simple and inex-pensive, and high condensate qualities can bereached.Condensate PolishingReverse OsmosisProcess WaterWaste WaterRaw WaterMembraneFiltrationUF/NF/ROEvaporationMembraneFiltrationROPre-concentrationFractionationCondensatePolisherProcess WaterWaste WaterRaw WaterMembraneFiltrationUF/NF/ROEvaporationMembraneFiltrationROPre-concentrationFractionationCondensatePolisherGEA Filtration at GEA WiegandGEA Filtration is a Strategic Business Unit ofGEA AG with filtration departments at Niro,GEA Wiegand and GEA Liquid Processing. Theunique combination of know-how in membra-ne filtration and evaporation in these threecompanies enables us to offer the latest tech-nology in condensate polishing. Thanks to thisexperience we are in a position to supplysystems with long trouble-free operation andlow operating costs and, at the same time, highpermeate qualities. Modern reverse osmosis membranes offer a sta-bilized salt rejection of up to 99.7 %. Whendesigning reverse osmosis plants, the followingaspects must be taken into consideration:n The rejection of a reverse osmosis membraneincreases with higher operating pressures.n The operating pressure of a reverse osmosis membrane increases with low condensatetemperature.n The reverse osmosis membrane must be protected against oil and organic solvents.n The rejection of impurities contained in the feed is not only dependent on the molecular size/weight but also on the polarity of the molecule. The more polar the molecule is thelower is the rejection.n The rejection of organic acids is higher if theorganic acids are neutralized with caustic into the corresponding salts.System and process descriptionThe condensate is pumped at a minimal inletpressure of 4 bar to the automatic backwash fil-ter and from there to feed balance tank B01.Pump P01 pumps the water from the feedbalance tank to the redundant installed safetyfilters which have a cut-off of 1 µm. This confi-guration prevents the blocking of the osmosiselements by particles and dust. A tubular heatexchanger is installed downstream from thesafety filters for heating of the cleaning solu-tions during CIP.The downstream frequency-controlled highpressure pump P02 generates the required fil-tration pressure and crossflow. The membranesare installed in a pressure tube with 6 mem-brane slots. The degree of blocking of the membrane is monitored by a pressure loss measuring instrument.In the membranes, the water is separated intopurified permeate and condensate. The concen-trate containing all the salts and organicimpurities is transferred to a system for furthertreatment. The permeate is conveyed to thepermeate storage tank.The plant is equipped with all necessary installa-tions for CIP including all recirculation lines andvalves.The condensate qualities to be reached can bedetermined in inexpensive preliminary tests.Simplified flow sheet reverse osmosisCapacities, power connections and budget prices GEA Wiegand has designed modular singlestage reverse osmosis systems in the followingstandard sizes: Required space L x W x H 7,500 x 2,350 x 2,350 mmplus 1,500 mm service room in the length direction on every side.Permeat: 80 % (of feedflow)Design temperature: 15 - 40 °CFeed pH: 3 - 10COD reduction: ~80 % (depending onfeed COD composition)Our Scope of Supply> Replacement of membranes> Laboratory and pilot testing> Development of applications> Optimisation of your processes> Project planning and management> Process integration> Delivery of complete turnkey plants> After-sales service and plant maintenancePlease contact our experienced specialists for your case of application. Process EngineeringDivisionGEA FiltrationProcess EngineeringDivisionGEA FiltrationGEA Filtration . GEA Wiegand GmbH . Einsteinstrasse 9-15 . D-76275 Ettlingen . Germany . Tel.: +49-(0)7243/705-218 .Fax: +49-(0)7243/705-226 . Email: info@geafiltration.de . Internet: www.geafiltration.com