Modelling approach to an ultrafiltration process for the removal of dissolved and colloidal substances from treated wastewater for reuse in recycled paper manufacturing. (February 2018)

• Record Type: Journal Article
• Authors: Sousa, Mayko Rannany S.; Lora-Garcia, Jaime; López-Pérez, Maria-Fernanda
• Is Part Of: Journal of water process engineering. Volume 21(2018)
• Page Start: 96
• Page End: 106
• Publication Date: 2018-02
• Subjects: Ultrafiltration -- Modelling -- Treated wastewater -- Colloidal and dissolved substances (DCS) -- Paper mill; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2017.11.017
• Languages: English
• ISSNs: 2214-7144

Abstract

Highlights: UF for the removal of DCS from a secondary clarifier effluent from a WWTP in a papermaking factory. Permeate flux decline and fouling resistances were studied. Pore blocking model was examined using the coefficient of determination R 2 . Permeate flux predictions by intermediate blocking model achieves the best predictions. Deviation between the resistance in series model and the experimental flux data. Abstract: In this work, ultrafiltration (UF) is used to remove dissolved and colloidal substances (DCS) from a secondary clarifier effluent from a wastewater treatment plant (WWTP) in a papermaking factory. The approach has been to examine and model the decline in permeate flux resulting from membrane fouling. Effluent from a WWTP at a papermaking factory, previously filtered, was used as feed. UF experiments were carried out in a laboratory-scale plant using a 10 kDa polyethersulfone (PES) UF membrane in a flat sheet module with an active area of 154.8 cm 2 . The transmembrane pressure (TMP) (1–3 bar) and crossflow rate (1.5–4.5 L/min) were varied during the experiments, at constant temperature (22 ± 0.5 °C). Experimental results from UF tests were expressed in terms of permeate flux (Jp) as a function of time to check modified Hermia's models adapted to crossflow filtration. The parameters of these models were theoretically estimated. The predicted results were compared with experimental data with a high goodness of fit. The results showed that the phenomenon controlling fouling, under most of the conditions tested, was intermediate blocking (R 2 > 0.96). Measurements of particle size distribution and zeta potential near the isoelectric point, showed a substantial reduction in colloidal compounds. Additionally, given that COD was removed down to 110 mg/L, it could be said that UF is suitable for producing water that can be reused in different papermaking processes.