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Location | Location I Sas van Gent, Netherlands | Location II Dordrecht, Netherlands | Location III Veendam, Netherlands |
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Linear flow velocity | 0.184 m s−1 | 0.202 m s−1 | 0.202 m s−1 |
Feed pressure | 1 bar | 1 bar | 1 bar |
Total duration | 8 hours | 24 hours | 6.5 hours |
Step1 | Circulation with NaOH 60 min; T = 35°C; pH = 12 | Circulation with NaOH 120 min; T = 35°C; pH = 12 | Prerinsing with demi water |
Step2 | Soaking with NaOH 30 min; T = 35°C; pH = 12 | Soaking (overnight) with NaOH T = 20°C; pH = 12 | Soaking with demi water 30 min |
Step3 | Circulation with NaOH 60 min; T = 35°C; pH = 12 | Rinsing with demi water | NaHSO3; pH = 10.5 (adjust pH with NaOH) 60 min; T = 35°C; C = 1–1.5% v/v |
Step4 | Soaking 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 |
Step5 | Circulation with NaOH 60 min; T = 35°C; pH = 12 | Final rinsing with demi water | Rinsing with demi water |
Step6 | Soaking with NaOH 30 min; T = 35°C; pH = 12 | | Divos 2 30 min; T = 35°C; pH = 2.5 |
Step7 | Rinsing with demi water | | Soaking with Divos 2 60 min; T = 20°C; pH = 2.5 |
Step8 | Circulation with HCl 60 min; T = 35°C; pH = 2.1 | | Final rinsing with demi water |
Step9 | Soaking with HCl 30 min; T = 35°C; pH = 2.1 | | |
Step10 | Circulation with HCl 60 min; T = 35°C; pH = 2.1 | | |
Step11 | Soaking with HCl 30 min; T = 35°C; pH = 2.1 | | |
Step12 | Final rinsing with demi water | | |
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