Electrodeionization Systems in Bangladesh We Supply Electrodeionization in Bangladesh. EDI systems remove ionized and ionizable species from water using electrically active media and electrical potential (DC power supply) to influence ion transport. By using EDI purification technology, caustic and acidic types of chemicals are not necessary. The water treated by RO-EDI has usually exceeded customer’s high-purity standards. Toptech Electrodeionization system is a continuous electro-chemical process of water deionization where ion specific membranes, mixed bed resin and a DC voltage across them, change the standard hazardous acid-caustic chemical regeneration process.
Our latest technology of EDI, modules must be pretreated with RO for many reasons. The advantages and disadvantages of softening and One pass and Tow pass RO as pretreatment? Many EDI systems using Toptech EDI technology perform very well with single pass RO. It is easy to achieve 16 Megaohm with single pass RO. Most USP WFI and purified water systems easily meet up requirements with single pass RO. As a basic knowledge in the water treatment industry, softening with single pass RO system is less expensive and less complex than a double pass RO system. Two pass RO followed by EDI gives the following advantages, and is often used for power plants or pharmaceutical applications. • Lower conductivity > higher EDI quality • Lower CO2 > higher silica removal • ppb-level contaminants means infrequent EDI cleaning • Higher rated flows for EDI Single pass RO system can be improved using membrane degasser for even better EDI performance. Membrane degasser can reduce the CO2 which increase EDI performance, reduces scaling potential, and helps SiO2 removal by the EDI machine. “Toptech” EDI systems have many options: • Softener followed by “Toptech” RO followed by EDI modules • Softener followed by “Toptech” RO followed by membrane degasser followed by EDI modules • “Toptech” RO followed by caustic dosing followed by RO followed by EDI modules It is hard to meet the feed specification to the EDI plants without pH adjustment and/or membrane degasser. Lessening the CO2 before the EDI will decrease the load (lower amps) and develop the product quality. Toptech installed a membrane degasser on many EDI skids for CO2 removal/reduction. It was additional cost efficient, compact and decreases installation time.