NF retentate flow rate (L/h) 900
RO permeate flow rate (L/h) 50
Water injection flow rate (m3/h) 108
NF elements required 120
RO elements required 2,160
Total cost for NF elements (USD) 40,200
Total cost for RO elements (USD) 1,568,160
Table 3: Membranes required for water injection by NF and RO.