Analysis of reverse osmosis filter permeability

Salamon, Endre; Goda, Zoltan; Berek, Tamás

doi:10.1556/606.2018.13.3.21

Cited by 3 publications

(1 citation statement)

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“…The two factors were the transmembrane pressure (TMP) and the retentate flow rate (Q). Generally, in the case of RO processes, the retentate flow rate (Q) is lower than the feed flow rate by the permeate flow rate (flow drop) [ 23 ]. In this study, the permeate flow rates were less than 0.4% of the feed flow rates, and thus, the flow drops were negligible.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study and Modeling of Beer Dealcoholization via Reverse Osmosis

et al. 2023

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The goals of the present investigation are to study and to model pale lager beer dealcoholization via reverse osmosis (RO). Samples were dealcoholized at a temperature of 15 ± 1 °C. An Alfa Laval RO99 membrane with a 0.05 m2 surface was used. The flux values were measured during the separations. The ethanol content, extract content, bitterness, color, pH, turbidity, and dynamic viscosity of beer and permeate samples were measured. The initial flux values were determined using linear regression. The initial ethanol flux (JEtOH 0) values were calculated from the initial flux values and the ethanol content values. A 2P full factorial experimental design was applied, and the factors were as follows: transmembrane pressure (TMP): 10, 20, 30 bar; retentate flow rate (Q): 120, 180, 240 L/h; JEtOH 0 was considered as the response. The effect sizes of the significant parameters were calculated. The global maximum of the objective function was found using a self-developed Grid Search code. The changes in the analytical parameters were appropriate. The TMP had a significant effect, while the Q had no significant effect on the JEtOH 0. The effect size of the TMP was 1.20. The optimal value of the factor amounted to TMP = 30 bar. The predicted JEtOH 0 under the above conditions was 121.965 g/m2 h.

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Section: Methodsmentioning

confidence: 99%

Experimental Study and Modeling of Beer Dealcoholization via Reverse Osmosis

et al. 2023

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Investigation of coagulation and microfiltration for Danube water as the first step of make-up water production

Shaheen¹,

Cséfalvay²

2023

Chem. Pap.

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A comparison of coagulation with two coagulants, poly-aluminum chloride (PACl) and ferric chloride (FeCl3), followed by microfiltration, was evaluated to obtain a better coagulant for an efficient pretreatment method for make-up water preparation from Danube water for thermal power plants. Efficiency was determined by chloride concentration and retention based on the total suspended solid content of the treated water samples. Results were compared to microfiltration working alone as a chemical-free pretreatment. Addition of PACl resulted in the lowest total suspended solid content (18.0 ± 1.3 mg/L), slightly lower than obtained for microfiltration alone (19.6 ± 2.5 mg/L) and significantly lower than for FeCl3 (25.0 ± 3.3 mg/L). Regarding the retention values, coagulation with PACl followed by microfiltration, microfiltration working alone and coagulation with FeCl3 followed by microfiltration represented retention values of 68%, 66.21%, and 56.89%, respectively. Considering the chloride concentration, it remained constant after microfiltration alone; meanwhile, adding coagulants showed a significant rise, ~ 6.4- and 5.7-times higher than the raw water's value after adding FeCl3 and PACl, respectively. From environmental viewpoint, microfiltration alone is recommended because it can provide a steady flux and low total suspended solid content without additional load of chloride ion which shall be eliminated in the further desalination step.

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