Water. Desalination + reuse
Issue link: https://fhpublishing.uberflip.com/i/983801
24 Tech Quarterly June 2018 Water. desalination + reuse Proton anti-scaling so ware from Amercian Water Chemi- cals was rst introduced at the AMTA Conference in 2014. The platform's innovative approach to modelling membrane treat- ment systems which, unlike other anti-scalant predictors, accounts for ion complexes and ion activity in water, and di‚ erentiates between nano- ltration and reverse osmosis membranes, enabled it to improve on the accuracy of predicting water quality and chemical dosing requirements. Four years on from its introduc- tion, the product has taken another step forward by model- ling Desalitech's Closed Circuit Reverse Osmosis (CCRO) system design, enabling plant design- In a closed-circuit RO the overall concentrate pH that aff ects scaling is signifi cantly lower. The system design has a chemistry benefi t that helps to reduce the scaling. Mo Malki, American Water Chemicals chief executive and technical director TECH QUARTERLY Proton compares closed- circuit versus conventional RO ers and operators to compare the potential recovery rates and dosing requirements for varying feed waters and membranes in a conventional reverse osmosis (RO) system design versus a CCRO. "For our rejection co- eŒ cient to be accurate, we accounted for the system design, because things like Ž ux rates and concentration polarisation can impact on membrane scaling," explains Mo Malki, AWC chief executive and technical director. "So when Desalitech started to use Proton and tried running projections, a lot of times the so ware would behave as if the recovery rate was impossible, even though Desalitech knew for a fact that it was possible." AWC then became convinced that it should model the CCRO desalination system design within Proton, a challenge that took about six months in all to complete. Now in the Proton platform, conventional RO system designs run in parallel with the CCRO model, enabling users to switch from one to the other to make comparisons. "You log into the so ware and enter feed water chemistry — calcium, magnesium, sodium, sulphate, and so forth. Then the next step is to design a system or enter an existing design, and for di‚ erent recoveries you can see the scale formation you may have. Now, you can click the Desalitech Matt Jones (le ) of Desalitech, and American Water Chemicals' Mo Malki present the new closed-circuit modelling within the Proton anti-scaling so ware, at the AMTA/AWWA Membrane Technology Conference 2018