Journal of Engineering / 2017 / Article / Tab 2

Research Article

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

Table 2

Chemical cleaning in place (CIP) procedures applied at the three locations studied.

LocationLocation I
Sas van Gent, Netherlands
Location II
Dordrecht, Netherlands
Location III
Veendam, Netherlands

Linear flow velocity0.184 m s−10.202 m s−10.202 m s−1
Feed pressure1 bar1 bar1 bar
Total duration8 hours24 hours6.5 hours
Step1Circulation with NaOH
60 min; T = 35°C; pH = 12
Circulation with NaOH
120 min; T = 35°C; pH = 12
Prerinsing with demi water
Step2Soaking with NaOH
30 min; T = 35°C; pH = 12
Soaking (overnight) with NaOH
T = 20°C; pH = 12
Soaking with demi water
30 min
Step3Circulation with NaOH
60 min; T = 35°C; pH = 12
Rinsing with demi waterNaHSO3; pH = 10.5 (adjust pH with NaOH)
60 min; T = 35°C; C = 1–1.5% v/v
Step4Soaking with NaOH
30 min; T = 35°C; pH = 12
Circulation with Divos 2
90 min; T = 35°C; pH = 1.6
Soaking with NaHSO3
120 min; T = 20°C; pH = 10.5
Step5Circulation with NaOH
60 min; T = 35°C; pH = 12
Final rinsing with demi waterRinsing with demi water
Step6Soaking with NaOH
30 min; T = 35°C; pH = 12
Divos 2
30 min; T = 35°C; pH = 2.5
Step7Rinsing with demi waterSoaking with Divos 2
60 min; T = 20°C; pH = 2.5
Step8Circulation with HCl
60 min; T = 35°C; pH = 2.1
Final rinsing with demi water
Step9Soaking with HCl
30 min; T = 35°C; pH = 2.1
Step10Circulation with HCl
60 min; T = 35°C; pH = 2.1
Step11Soaking with HCl
30 min; T = 35°C; pH = 2.1
Step12Final rinsing with demi water

demi water = dimineralized water (RO permeate); Divos 2 = mixed acid detergent descaler (JohnsonDiversey, UK).

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