The fouling and blocking problems frequently occurred on security filter cartridge in predesalination system of a power plant.Thus

water quality analysis was conducted for this pretreatment system.Moreover

a small scale dynamic test apparatus was employed to investigate the cleaning effects of activated carbon bed on organic matters

residual chlorine and bacteria.The residual chlorine concentration in water was regulated to 0.2mg/L to 0.4mg/L

and chlorine content should be lower than 0.1mg/L was regarded as the control index for adding the reductant.After the optimization

the bacteria content in this pretreatment system was effectively inhibited and the pressure difference had no increase during three months' continuous operation of the security filter.