Title: Membrane Fractioning of Pre-Treated Waste Activated Sludge for the Recovery of Valuable Biocompounds
Abstract: Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Membrane Fractioning of Pre-Treated Waste Activated Sludge for the Recovery of Valuable Biocompounds 37 Pages Posted: 29 Sep 2022 See all articles by Daniel NúñezDaniel NúñezUniversity of OviedoPaula OulegoUniversity of OviedoSergio ColladoUniversity of OviedoMahdi Nikbakht FiniAalborg UniversityJens MuffAalborg UniversityFrancisco Amador RieraUniversity of OviedoMario DiazUniversity of Oviedo Abstract The recovery of added-value biocompounds from waste activated sludge (WAS) is a promising way to improve the sustainability of its management. In this study, WAS was partially oxidised by wet oxidation (WO) producing a highly complex stream mainly composed of humic acids (8.4 ± 0.2 g/L), proteins (3.7 ± 0.3 g/L) and carbohydrates (2.75 ± 0.03). This complex stream was treated by ultrafiltration in order to assess the influence of membrane material and molecular weight cut-off (MWCO) on its fractioning towards the recovery and purification of the biomolecules contained in the oxidised WAS. Three flat-sheet polymeric membranes composed of polyethersulfone (PES), permanently hydrophilic polyethersulfone (PESH), and polyacrylonitrile (PAN) with a MWCO of 50 KDa were evaluated, obtaining the best performance with PES membrane. Thus, high retention values (around 70% for proteins and carbohydrates, and 47% for humic acids) and high differences in selectivity between proteins and carbohydrates with humic acids (around 23%) were achieved.. For the size fractioning experiments, PES membranes of 10 and 3 kDa (PES10 and PES3) were used due to the great performance of this material. The best results were obtained when filtering the PES50 membrane permeate with the PES3 membrane, retaining 83% of carbohydrates, 87% of proteins and 69% of humic acids. These results open the possibility of proposing an integrated membrane process for purifying carbohydrates and proteins by diafiltration of the PES50 permeate, and humic acids by nanofiltration or reverse osmosis of the PES3 permeate. Besides, fouling was also studied by atomic force microscopy and by resistance-in-series, Hermia’s and Mehta’s fouling models. The main fouling in the PAN membrane and, to a lesser extent, in the PES one, was reversible. On the contrary, the fouling of the PESH membrane had a strong irreversible character. Cake filtration can be considered the mechanism that better explained the overall fouling in all the experiments. Keywords: Biomolecules, modelization, ultrafiltration, waste valorisation, wet oxidation Suggested Citation: Suggested Citation Núñez, Daniel and Oulego, Paula and Collado, Sergio and Fini, Mahdi Nikbakht and Muff, Jens and Riera, Francisco Amador and Diaz, Mario, Membrane Fractioning of Pre-Treated Waste Activated Sludge for the Recovery of Valuable Biocompounds. Available at SSRN: https://ssrn.com/abstract=4233020 Daniel Núñez University of Oviedo ( email ) Calle San Francisco, 1Oviedo, 33003Spain Paula Oulego University of Oviedo ( email ) Calle San Francisco, 1Oviedo, 33003Spain Sergio Collado University of Oviedo ( email ) Calle San Francisco, 1Oviedo, 33003Spain Mahdi Nikbakht Fini Aalborg University ( email ) Fredrik Bajers Vej 7EAalborg, DK-9220Denmark Jens Muff Aalborg University ( email ) Fredrik Bajers Vej 7EAalborg, DK-9220Denmark Francisco Amador Riera University of Oviedo ( email ) Calle San Francisco, 1Oviedo, 33003Spain Mario Diaz (Contact Author) University of Oviedo ( email ) Calle San Francisco, 1Oviedo, 33003Spain Download This Paper Open PDF in Browser Do you have a job opening that you would like to promote on SSRN? Place Job Opening Paper statistics Downloads 0 Abstract Views 3 PlumX Metrics Feedback Feedback to SSRN Feedback (required) Email (required) Submit If you need immediate assistance, call 877-SSRNHelp (877 777 6435) in the United States, or +1 212 448 2500 outside of the United States, 8:30AM to 6:00PM U.S. Eastern, Monday - Friday. Submit a Paper Section 508 Text Only Pages SSRN Quick Links SSRN Solutions Research Paper Series Conference Papers Partners in Publishing Jobs & Announcements Newsletter Sign Up SSRN Rankings Top Papers Top Authors Top Organizations About SSRN SSRN Objectives Network Directors Presidential Letter Announcements Contact us FAQs Copyright Terms and Conditions Privacy Policy We use cookies to help provide and enhance our service and tailor content. To learn more, visit Cookie Settings. This page was processed by aws-apollo-5dc in 0.281 seconds