Cilj ovog rada je bio koncentrirati sok aronije postupkom reverzne osmoze uz upotrebu membrana Alfa Laval-RO98pHt i istražiti utjecaj procesnih parametara tlaka i temperature na protok permeata pri tlakovima od 50 i 55 bara, s primjenom i bez primjene hlađenja. Koncentriranje se provodilo na laboratorijskom uređaju za reverznu osmozu LabUnit M20 s pločama i okvirima, primjenom kompozitnih membrana tipa Alfa Laval-RO98pHt. Uzorci permeata i retentata uzimani su u određenim vremenskim intervalima, svakih 12 minuta. Pokusima se pokazalo da je sok aronije moguće koncentrirati procesom revezne osmoze do maksimalnog udjela suhe tvari od 25,6 %. Povećanjem koncentracije suhe tvari u retentatu tijekom procesa koncentriranja smanjuje se i protok permeata. Tijekom koncentriranja soka aronije reverznom osmozom dolazi do zagrijavanja soka aronije, od početnih 10 °C na temperaturu oko 46 °C u procesu bez primjene hlađenja, odnosno na 25 °C u procesu s primjenom hlađenja

The aim of this study was to concentrate aronia juice by reverse osmosis using membrane type Alfa Laval - RO98pHt and to investigate the influence of process parameters of pressure and temperature on the permeate flow of aronia juice at pressures of 50 and 55 bar, with or without the use of cooling. Concentration was conducted on a laboratory device for reverse osmosis LabUnit M20 with panels and mountings, using composite membrane type Alfa Laval- RO98pHt. Samples of permeate and retentate were taken at regular time intervals, every 12 minutes. Experiments showed that the increase of dry matter in the retentate decreased flow in all processes. By increasing the proportion of dry matter the index of concentration magnifies in the permeate, which is especially noticed in the use of cooling in both of the pressures tested. By rising the index of concentration in the retentate an increase in volume relation retentate appears. During concentration by reverse osmosis, the temperature of aronia juice is getting bigger and bigger, from initial 10 ⁰C to 46 °C in process without the use of cooling, or to 25°C in the process with the use of cooling.