Journal of Engineering / 2017 / Article / Tab 3

Research Article

Membrane Fouling and Chemical Cleaning in Three Full-Scale Reverse Osmosis Plants Producing Demineralized Water

Table 3

CIP procedures for (bio)organic fouling removal at laboratory scale.

Adapted procedure (AP) IAdapted procedure (AP) II

Feed pressure1 bar1 bar
Total duration4.5 hours3 hours
Step1Prerinsing with demi waterPrerinsing with demi water
Step2Acid, P3-Ultrasil 73
45 min; T = 45°C; C = 1.5% v/v; pH = 2.5
Alkaline, P3-Ultrasil 110
30 min; T = 30°C; C = 1.5% v/v; pH = 12.1–12.3
Step3Rinsing with demi waterRinsing with demi water
Step  4Neutral, P3-Ultrasil 53
90 min; T = 37°C; C = 1.5% w/v; pH = 9.6–10
Acid, P3-Ultrasil 73
30 min; T = 45°C; C = 1% v/v; pH = 2.5
Step  5Neutral, P3-Ultrasil 53
30 min; T = 30–45°C; C = 4% w/v; pH = 8–10
Rinsing with demi water
Step6Rinsing with demi waterAlkaline, P3-Ultrasil 110
30 min; T = 35°C; C = 0.8% v/v; pH = 11.6–11.8
Step7Sanitizing, P3-oxonia active
60 min; °C; C = 1% v/v
Final rinsing with demi water
Step8Final rinsing with demi water

demi water = dimineralized water.

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