Effect of IX dosing on polypropylene and PVDF membrane fouling control

Abstract

11 12The performance of ion exchange (IX) resin for organics removal from wastewater was 13 assessed using advanced characterisation techniques for varying doses of IX. Organic 14 characterisation using liquid chromatography with a photodiode array (PDA) and 15 fluorescence spectroscopy (Method A), and UV 254 , organic carbon and organic nitrogen 16 detectors (Method B), was undertaken on wastewater before and after magnetic IX treatment. relative to the untreated water. However, at longer filtration times the rate of fouling of IX 30 treated waters was lower than untreated water and the relative fouling rates corresponded to 31 the amount of biopolymer material in the feed. It was proposed that the mode of fouling 32 changed from pore constriction during the initial filtration period to filter cake build up at 33 longer filtration times. The organic composition strongly influenced the rate of fouling during 34 the initial filtration period due to competitive adsorption processes, while at longer filtration 35 times the rate of fouling appeared to depend upon the amount of biopolymer material in the 36 feed water. 37 38

Interactions between protein-like and humic-like components in dissolved organic matter revealed by fluorescence quenching

“…Thus, wastewaterimpacted FDOM in urbanized rivers could appear as a significant Peak T (tryptophan-like fluorophores) and/or a Peak B (tyrosine-like fluorophores) at lower Ex/Em wavelengths in the EEM spectra (Baker, 2001;Henderson et al, 2009;Meng et al, 2013). Generally, the mixing behavior of FDOM with different sources could give rise to interactions between their end-members pools (Yang and Hur, 2014), leading to changes in their optical properties (Hur et al, 2006;Myat et al, 2013). We expect that different fluorophore groups in wastewaterimpacted FDOM, such as protein-like and humic-like substances, will likely interact with each other (Myat et al, 2014); however; few studies have thus far been performed to assess the potential for fluorescence quenching within FDOM components.…”

Combining Coagulation/MIEX with Biological Activated Carbon Treatment to Control Organic Fouling in the Microfiltration of Secondary Effluent

“…MIEX gave less removal of building blocks than humic substances. This is because building blocks contain a higher proportion of amine functionalised compounds than the humic fractions, and the anionic exchange character of the MIEX resin would adsorb organic acids in preference to amine functional groups [ 35 ]. The removal efficiency of low MW organics was significantly higher for BAC than for both coagulants.…”

Demonstration of membrane distillation on textile waste water: assessment of long term performance, membrane cleaning and waste heat integration

“…The inability of sodium hypochlorite to further restore flux is surprising, as it is well known to clean both PVDF and ceramic membranes used in low pressure filtration [43,44]. The reasons may relate to the very different membrane chemistries (hydrophobic PTFE vs hydrophilic PVDF) where the attachment of the fouling materials to the membrane work by different mechanisms [52,53], or indeed the nature of textile processing materials and their resistance to chlorine degradation. DI water rinsing did not show any improvement, which may be expected for a membrane fouled with organic matter.…”