EDITOR ’ S CHOICE RELIABLE VALVE SOLUTIONS
GEMU
Ultra-filtration and Partial Softening in Water Treatment
VALVE SOLUTIONS FOR DRINKING WATER TREATMENT In a successful municipal water treatment application that treats 300m ³ of water per minute , GEMÜ provides reliable valve solutions for ultra-filtration and partial softening processes .
PROCESS DESCRIPTION Ultra-filtration UF After coarse filtration , the water is fed to the Ultra-filtration passing through porous membranes with a pressure drop of 0,1 - 0,8 bar . This retains the finest solids , turbidity and pollens , as well as bacteria from passing through the membrane . However , the water containing dissolved ingredients such as hardness components or minerals , and small molecules can still pass through .
Partial softening and regeneration Ion exchange reduces the concentrations of hardness components ( calcium and magnesium ), and undesirable substances such as nitrates , sulphates and chlorides , by half from the sanitized water . Carbonic acid is generated as a by-product and dissolves into water and carbon dioxide ( CO2 ). The pure-water degasifier then removes the excess CO2 before transferring the treated water to a pure-water container and feeding it into the municipal water supply following UV sterilization . This reduces the water hardness from a hard level ( 480 ppm CaCO3 ) to a medium level of 240 ppm CaCO3 .
Raw water enriched with CO2 is used as a regenerating agent for the mixed-bed filter reversing the direction of the exchange process where high pressure dissolves CO2 to create carbonic acid . The carbonic acid is then fed in the counter current over the mixed-bed , regenerating the ion exchanger resin . About 95 % of the CO2 required for regeneration can be recovered and fed back into the process .
GEMÜ PRODUCTS IN USE All treatment processes for both raw and treated water distributions use GEMÜ 480 Victoria series butterfly valves ( up to DN 400 ), GEMÜ D450 plastic butterfly valves
Water treatment plant
GEMÜ butterfly valves in ultra-filtration plant
range , GEMÜ 717 manual plastic ball valves and GEMÜ LSC limit switch box for quarter turn actuators .
WHY GEMÜ ? GEMÜ offers the next generation of rubber lined butterfly valves , the R480 Victoria series , as a direct replacement for the GEMÜ 480 , offering multiple enhanced product features .
Thanks to its flow-optimized and sleek disc design , the R480 series achieves higher flow rate factors . This reduces the pressure loss , giving the butterfly valves greater energy efficiency . The PTFE-coated bushes reduce torques , not only allowing further savings through lower actuator costs , but also making the valves significantly more durable and therefore increasing longevity . Furthermore , the technical optimization of the liner improves tightness , which guarantees bubble-tight sealing and resistance to slipping .
With its wide range of valves and accessories , as well as measurement and control instrumentation , GEMÜ provides an optimal solution from a single source , saving the customers time , effort and cost not only in logistics and installation but also in documentation .
In addition , plastic butterfly valves and ball valves used in this application are available in various actuator and material versions .
Tel : 01925 824044 | Email : enquiries @ gemu . co . uk | Web : www . gemu . co . uk
20 PECM Issue 59