Section 4.16 Membranes Gas

For separation of permanent gases Full process cost 2000000 for a gas flow rate = 1 m /s with n = 0.93. Sensitive to concentration of target gas and compression. Flat and hollow fiber membrane only cost 150/m.  

Permeation FOB membrane flat, or hollow fiber excluding auxiliary equipment. FOB cost = 130000 at membrane area = 560 m with n = 0.42 for the range 100-560 and n = 1.00 for the range 560-10000. 

Dialysis Hollow fiber throwaway units for medical application. FOB cost = 100 for a surface area = 1 m.  

Electrodialysis, reverse polarity for 4000 mg/L TDS alkalinity to 500 mg/L with minimum pretreatment including brine recirculation pumps, ED stack, electrical equipment, brine discharge facilities, product water treatment and storage, building, intake pipes and transfer pumps. TM cost = 25 000 000 at feed rate = 100 L/s with n = 0.82 for the range 40-1500 L/s. Feed factors 4000 ppm, X 1.00 2000 ppm, X 0.7 850 ppm, X 0.1. 

Electrodialysis ED stack, spacers, end plates, electrodes and stack hardware. FOB cost = 2 800 000 for a membrane area = 3000 m with n = 0.7 for the range 1500-7000 m. Factor FOB, X 1.00 TM unit including stacks, rectifiers, auxiliary equipment, treatment building and pumping stations, X 2.7. 

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