In case of raw seawater ...
Published by Mohamed Mahmoud, Water Desalination Technical Manager & Process Expert at ROMCO-NOMAC-ACWA POWER
In case of raw seawater SDI=5, then conventional pre-treatment system (Disinfection.....Coagulation & Flocculation.....DMF .... 5 micron cartridge filter will enable you to get SDI less 3. but what about the seasonal change, is it highly causing a physical disturbance in the inlet raw water? Also, you have to keep a focus on the pre-treatment design such optimum filtration velocity, the lower the filtration velocity, the optimum the filtration (10-20 m/h is the recommended filtration velocity through DMF but I consider the optimum filtration velocity is 10-14 m/h), frequency of DMF backwash, optimization chemical pre-treatment (Coagulant dose rate), ......