Patent ID: 11866356
Assignee: KEMIRA OYJ
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 8:
9. A system that performs the method as claimed in claim 1, the system comprising a dosing unit configured to add at least one pretreatment chemical to the water stream in a pretreatment process, an online monitoring unit configured to monitor hydrophobic conditions of the water stream upstream and/or downstream from adding the at least one pretreatment chemical, the online monitoring unit comprising optical detectors of a fluorescence detector and a light scattering detector, wherein the dosing unit is controlled based on monitored hydrophobic conditions data provided from the online monitoring unit such that the hydrophobic conditions in the pretreated water are brought towards target hydrophobic conditions,
wherein the online monitoring unit determines the monitored hydrophobic conditions in the water stream by determining hydrophobicity based on a fluorescence measurement, and by determining the amount or count of particles based on a light scattering measurement, and
wherein a process controller of the pretreatment process is connected to a membrane cleaning system of a membrane filtration stage following the pretreatment process,
wherein the membrane cleaning system is controlled based on the monitored hydrophobic conditions.