Boiler feedwater purification process
Boiler feedwater treatment plants use a variety of pollutants to remove pollutants, including hardness, iron, silica, sodium, and chlorides. The basic process is to remove suspended solids before the reverse osmosis (reduce dissolved solids) and finally EDI polishing. RO pretreatment usually includes coagulation, flocculation, clarification, sand filtration, etc. In the pretreatment, 100% of the suspended particles must be substantially removed. RO removes about 99% of dissolved salts in water or TDS.
EDI is the ultimate polisher. Continuous Electrodeionization (CEDI or EDI) is a process that uses electricity to produce ultrapure deionized/deionized water. Although it uses ion exchange resins, it can be continuously regenerated without chemicals (ie, caustic and acid used in conventional ion exchange systems).
Compared with mixed bed (IX), EDI system has many advantages:
1. Easy to get a license
2. The green technology-no chemical process required
3. Reduce operating costs
4. No need for hazardous waste (neutralization box/system is not required)
5. No need to deal with, dispose or store issues/concerns
7. Small footprint/space requirement
Compared with the traditional ion exchange process, the standard of the boiler feed industry is developing in the direction of reverse osmosis RO pretreatment and EDI. Obtaining permits (storage and disposal) for hazardous chemicals is becoming increasingly difficult. CHIWATEC has boiler water plants and systems using RO-EDI technology.
CHIWATEC‘s water treatment technologies for boiler feedwater solutions include:
- RO Water Treatment System
- Water softening
- Industrial filtration