Performance of a vibratory shear membrane filtration system during the treatment of magnetic ion exchange process concentrate

Leong, Jack; Tan, Joachim; Heitz, Anna; Ladewig, Bradley P.

doi:10.1016/j.desal.2015.02.042

Cited by 5 publications

(10 citation statements)

References 19 publications

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“…In experiments containing both Br – and Cl – , Br – was added at 1 mol % Cl – , corresponding to molar ratios reported in brines (i.e., 0.1–1 mol %, Table S3). ,,,,,,− When isolating the effect of Cl – alone, different experiments were performed with both lower-purity (i.e., ≥99.0%, 0.004 mol % Br – , Text S3 , and Figure S4) and higher-purity (99.999%) Cl – reagents as indicated in corresponding figures. When Br – was added, lower-purity Cl – was used because the trace Br – in the Cl – reagent is negligible relative to the added Br – .…”

Section: Methodsmentioning

confidence: 99%

Effects of Halides on Organic Compound Degradation during Plasma Treatment of Brines

Chen,

Moher,

Rogers

et al. 2024

Environ. Sci. Technol.

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Plasma has been proposed as an alternative strategy to treat organic contaminants in brines. Chemical degradation in these systems is expected to be partially driven by halogen oxidants, which have been detected in halide-containing solutions exposed to plasma. In this study, we characterized specific mechanisms involving the formation and reactions of halogen oxidants during plasma treatment. We first demonstrated that addition of halides accelerated the degradation of a probe compound known to react quickly with halogen oxidants (i.e., para-hydroxybenzoate) but did not affect the degradation of a less reactive probe compound (i.e., benzoate). This effect was attributed to the degradation of para-hydroxybenzoate by hypohalous acids, which were produced via a mechanism involving halogen radicals as intermediates. We applied this mechanistic insight to investigate the impact of constituents in brines on reactions driven by halogen oxidants during plasma treatment. Bromide, which is expected to occur alongside chloride in brines, was required to enable halogen oxidant formation, consistent with the generation of halogen radicals from the oxidation of halides by hydroxyl radical. Other constituents typically present in brines (i.e., carbonates, organic matter) slowed the degradation of organic compounds, consistent with their ability to scavenge species involved during plasma treatment.

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Section: Methodsmentioning

confidence: 99%

Effects of Halides on Organic Compound Degradation during Plasma Treatment of Brines

Chen,

Moher,

Rogers

et al. 2024

Environ. Sci. Technol.

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“…Operation of VSEP at set permeate recoveries of 75-85% all resulted in over 98% removal of dissolved organic carbon [20]. Molecular weight distribution analysis between the feed and permeate streams showed that the average molecular weight seen in the feed is 1400-1500 Da compared to just 1000 Da in the permeate.…”

Section: Technical Performancementioning

confidence: 98%

“…This mode of operation continues until the tank level reaches its minimal threshold of 5% and the filtration ceases. The remaining contents are drained into the same waste tank and the vessel is flushed with process water prior to the next batch [20].…”

Section: Methods Of Process Operationmentioning

confidence: 99%

Use of vibratory shear enhanced processing to treat magnetic ion exchange concentrate: A techno-economic analysis

et al. 2016

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Disposal of waste generated by inland water treatment technologies is highly expensive. The introduction of vibratory shear enhanced processing (VSEP) to treat waste produced from magnetic ion exchange (MIEX) shows benefits in terms of performance and economics. A small VSEP unit fitted with a nanofiltration (NF) membrane is capable of treating up to 15kL of MIEX waste per day, is able remove more than 97% of dissolved organic compounds as well as recover over 80% of waste in the form of permeate. The reuse of permeate to makeup brine has seen significant reductions in salt consumption and waste disposal at Wanneroo Groundwater Treatment Plant (GWTP). During the first year of VSEP operation, salt consumption reduced by 42% and waste disposal was projected to reduce by 23.9%. Further improvements in both cost categories were observed in the second year of operation and considering the same trend is followed, the payback period of the project will occur between the 6 th and 7 th year of operation for discounted analysis and has a positive net present value.

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“…Thus, this approach is not a sustainable waste management strategy and the treatment of the brine is inevitable. In recent years, a few studies documented the possibility of the safe treatment of the IX spent brine using membrane-based techniques (mainly using nanofiltration) [ 9 , 10 ]. Nonetheless, the severe membrane NOM fouling of the nanofiltration membranes has impaired the long-term applicability of this option [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Towards Water, Sodium Chloride and Natural Organic Matter Recovery from Ion Exchange Spent Brine

2021

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Despite the tremendous success of the application of anion exchange resins (IX) in natural organic matter (NOM) removal over conventional removal methods, the considerable amount of brine spent during its regeneration cycle makes its sustainability questionable. This polluting saline stream can be challenging to manage and costly to discharge. Alternatively, and with the recent shift in perception of resource recovery, the produced spent brine can no longer be seen as a polluting waste but as an unconventional source of water, minerals and nutrients. In this research, for the first time, we evaluated the effectiveness of an integrated monovalent selective electrodialysis (MSED) and direct contact membrane distillation (DCMD) system in IX spent brine desalination and resource recovery. Of particular interest were the effects of operating time on the characteristics of the monovalent permselective ion exchange membranes, the impact of the DCMD stack configuration on minimizing heat loss to the ambient environment and the efficacy of the recovered NaCl in the regenerating cycle of the exhausted IXs. Our findings demonstrated that although the recovered NaCl from the stand-alone MSED can restore nearly 60% ion exchange capacity of the exhausted IXs, coupling MSED with DCMD led to minimizing the consumption of fresh NaCl (in the IX regeneration cycle) significantly, the potential application of NOM in agriculture and diminishing the risk of the IX spent brine disposal. In addition, the initial characteristics of the ion permselective membranes were maintained after 24 h of MSED and the transmembrane flux was increased when the feed/hot compartment (in the DCMD stack) was encapsulated on two outer ends with coolant/permeate compartments as a result of less heat loss to the ambient environment.

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Performance of a vibratory shear membrane filtration system during the treatment of magnetic ion exchange process concentrate

Cited by 5 publications

References 19 publications

Effects of Halides on Organic Compound Degradation during Plasma Treatment of Brines

Effects of Halides on Organic Compound Degradation during Plasma Treatment of Brines

Use of vibratory shear enhanced processing to treat magnetic ion exchange concentrate: A techno-economic analysis

Towards Water, Sodium Chloride and Natural Organic Matter Recovery from Ion Exchange Spent Brine

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