Effect of ferrate pre-oxidation on algae-laden water ultrafiltration: Attenuating membrane fouling and decreasing formation potential of disinfection byproducts

He, Haiyang; Qiu, Wei; Liu, Yu-Lei; Yu, Hui; Wang, Lu; Ma, Jun

doi:10.1016/j.watres.2020.116690

Cited by 65 publications

(18 citation statements)

References 34 publications

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“…However, this effect of amines depends on the concentration of amines compared to that of Fe(VI) because the formation of the Fe IV –amine complex and its enhanced performance depend on the molar ratio of amine to Fe(VI). Furthermore, the oxidation of amines will eliminate one of the precursors in water that generate DBPs during chlorination; ,, therefore, the amount of chlorinated DBPs would decrease in the use of Fe(VI) as a preoxidant before chlorination. Fe(VI) has been demonstrated to be an effective disinfectant and coagulant. ,− Therefore, application of Fe(VI) has a potential to have multiple advantages in treatment processes.…”

Section: Discussionmentioning

confidence: 99%

Generation of Iron(IV) in the Oxidation of Amines by Ferrate(VI): Theoretical Insight and Implications in Oxidizing Pharmaceuticals

et al. 2021

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Aliphatic amines are ubiquitously present in natural waters and constitute one of the major moieties in dissolved organic matter and water micropollutants such as pharmaceuticals. This paper presents aliphatic amine {monomethylamine (CH3NH2, MMA), dimethylamine [(CH3)2NH, DMA], and trimethylamine [(CH3)3N, TMA]}-enhanced oxidation of pharmaceuticals (trimethoprim, atenolol, carbamazepine, and sulfadiazine) by ferrate(VI) [FeVIO4 2–, Fe(VI)]. The magnitude of the enhancement varies with amines, and DMA shows the greatest potential to increase the level of oxidation of trimethoprim. The computational approach is applied to describe the trend of an increased level of oxidation by Fe(VI) in the presence of amines. The computation showed that an Fe(VI)/amine solution forms highly reactive FeIV species as intermediates that react with pharmaceuticals to yield enhanced oxidation. In the rate-determining step of Fe(VI) reactions with amines, TS1, the Fe(VI) is reduced and abstracts an H from N, followed by the transfer of an O atom to N to form a very stable intermediate involving a nitroxide radical. The abstracted H is then transferred back to the N-O group in TS2 to form an H-bonded product complex, which dissociates to the products. The difference in the reactivity of the FeIV species with the type of amine explains the trend seen experimentally in the enhanced oxidation of pharmaceuticals.

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Section: Discussionmentioning

confidence: 99%

Generation of Iron(IV) in the Oxidation of Amines by Ferrate(VI): Theoretical Insight and Implications in Oxidizing Pharmaceuticals

et al. 2021

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“…Accordingly, other HWTs based on activated carbon, sand, or membrane filtration, for instance, could also be favored. That is because surface charge properties influence adsorption (Hijnen et al 2007) and there is data on attenuation of membrane fouling and decreasing formation potential of DBPs after preoxidation correlating to the reduction of negativity of zeta potential (Khan et al 2020;He et al 2021).…”

Section: Water Clarificationmentioning

confidence: 99%

Effects of hydrogen peroxide preoxidation on clarification and reduction of the microbial load of groundwater and surface water sources for household treatment

et al. 2021

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Household water treatment (HWT) technologies are a promising strategy for addressing the waterborne diseases burden. However, in order to be efficient, these are often limited to water quality and require it to not exceed a certain threshold of physicochemical and microbiological contamination. Additionally, some popular HWTs, as chlorination, are related to by-product formation. Preoxidation may improve source water quality, and hydrogen peroxide (H2O2) is an oxidant that has not been deeply explored in this specific application, so it could be an innovative approach to HWTs. We investigated effects of H2O2 preoxidation in two natural source waters (surface and groundwater), spiked with a high level of microorganisms. Clarification results suggested this pretreatment may improve life of HWTs. Reduction in microbial load of groundwater was considered ineffective, but 5-min H2O2 preoxidation at 15 mg L−1 led to >4.0 log10 inactivation of Phi X174 coliphage and >3.0 of Escherichia coli in surface water. We believe this performance was increased due to the presence of catalysts in the river water. This raised the point that water quality may be not only impairing, but potentially beneficial to the main HWT and characterization is crucial prior to the implementation of any technologies.

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“…The sudden excessive growth of seasonal algae in lakes and reservoirs excessively burdens drinking water treatment plants (DWTPs) and worsens the water quality (Lin et al 2018). However, conventional water treatment technologies, including coagulation, flocculation and filtration, are inefficient for removing cyanobacterial blooms and some dissolved organic matter (Bai et al 2019), and even excessive algae will clog filtration tanks during the operation of waterworks (He et al 2021). During the growth and death of algae, undesirable organic matter is released into the water, such as algae organic matter (AOM) (Dong et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Pilot study on the treatment of lake water with algae by ultrafiltration–ozone–biologically activated carbon

Yan

Gui

et al. 2021

Journal of Water Supply: Research and Technology-Aqua

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For the treatment of lake water with algae, the coagulation–ultrafiltration–ozone–biologically activated carbon (CUF–O3–BAC) integrated process was first used to treat East Taihu Lake water in China, aiming at evaluating the removal efficiencies of algae, permanganate index (CODMn), UV254, NH3-N and disinfection by-products (DBPs) precursors. In addition, the long-term performance of the membrane operation under the fluxes of 60, 70, 80 and 90 L/(m2·h) was also investigated, and kinetic models were established. The experimental results showed that the integrated process had positive impaction of algae, CODMn, UV254 and NH3-N removal, and the removal rates were 95.89 ± 1.52, 76.18 ± 4.38, 72.06 ± 4.72 and 81.31 ± 6.71%, respectively. The CUF process was prone to increase the formation potentials of DBPs. Although ozone could reduce the formation risks of chlorinated trihalomethanes (THMs) to a certain extent, it is ineffective to reduce those of brominated THMs and haloacetic acids (HAA5). However, the CUF–O3–BAC process was an effective technology for the removal of THMs and HAA5 precursors in drinking water treatment. Finally, it was found that the relationship between transmembrane pressure and time conformed to the first-order and second-order kinetic models, and the linear fitting coefficients were all above 90%.

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Effect of ferrate pre-oxidation on algae-laden water ultrafiltration: Attenuating membrane fouling and decreasing formation potential of disinfection byproducts

Cited by 65 publications

References 34 publications

Generation of Iron(IV) in the Oxidation of Amines by Ferrate(VI): Theoretical Insight and Implications in Oxidizing Pharmaceuticals

Generation of Iron(IV) in the Oxidation of Amines by Ferrate(VI): Theoretical Insight and Implications in Oxidizing Pharmaceuticals

Effects of hydrogen peroxide preoxidation on clarification and reduction of the microbial load of groundwater and surface water sources for household treatment

Pilot study on the treatment of lake water with algae by ultrafiltration–ozone–biologically activated carbon

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