Abstract
Gravity-driven membrane (GDM) filtration is currently limited by the relatively low permeate flux and poor water quality. This study was aimed to investigate the effects of prechlorination (3 and 5 mgCl2/L) on the permeate flux and water quality in GDM filtration by analyzing the compositions and morphologies of the fouling layer and by evaluating virus removal and trihalomethane (THM) formation for short (7 cycles) and long (32 cycles) periods. Prechlorination showed an increased permeate flux, contributing to enhanced cumulative water production (15–68%), which was achieved by lowering the extracellular polymeric substances (EPS) content (14–31%) and the formation of a relatively thinner and looser fouling layer. Prechlorination effects lessened with longer GDM operation time owing to bacterial regrowth and formation of a thick (178–227%) and dense (57–66%) fouling layer. It also changed the dominant phylum in the eukaryotic community and limited its activities in the fouling layer. In terms of the permeate water quality, the prechlorination ensured microbial safety with a 3.2 log10 reduction of MS2 bacteriophage and negligible formation of THMs. These results demonstrate the potential of using prechlorination in GDM filtration for sustainable drinking water treatment.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
