Enhanced coagulation using a magnetic ion exchange resin

Singer, Philip C.; Bilyk, K.

doi:10.1016/s0043-1354(02)00115-x

Cited by 219 publications

(133 citation statements)

References 21 publications

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“…Singer and Bilyk analyzed the water quality of nine different water utilities across the United States, and it was found that the TOC concentrations ranged from 2.6 to 26.4 mg/L, the UV absorbance ranged from 0.030 to 1.096 cm − 1 , while the SUVA ranged from 1.4 to 4.5 L/(mg ⋅ m) [79]. Other studies indicated that typical NOM concentration in lake and river waters is ∼0.4-4.0 mg C/L and 10-30 mg C/L for wetlands (which is equivalent to ∼ 0.8-8.0 and 20-60 mg C/L total NOM concentration assuming 50 wt % carbon), and the NOM concentration is typically 1 mg C/L in seawater [77,80].…”

Section: Biocolloid Geocolloid and Natural Organic Mattermentioning

confidence: 99%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

169

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The application of nanoparticles has raised concern over the safety of these materials to human health and the ecosystem. After release into an aquatic environment, nanoparticles are likely to experience heteroaggregation with biocolloids, geocolloids, natural organic matter (NOM) and other types of nanoparticles. Heteroaggregation is of vital importance for determining the fate and transport of nanoparticles in aqueous phase and sediments. In this article, we review the typical cases of heteroaggregation between nanoparticles and biocolloids and/or geocolloids, mechanisms, modeling, and important indicators used to determine heteroaggregation in aqueous phase. The major mechanisms of heteroaggregation include electric force, bridging, hydrogen bonding, and chemical bonding. The modeling of heteroaggregation typically considers DLVO, X-DLVO, and fractal dimension. The major indicators for studying heteroaggregation of nanoparticles include surface charge measurements, size measurements, observation of morphology of particles and aggregates, and heteroaggregation rate determination. In the end, we summarize the research challenges and perspective for the heteroaggregation of nanoparticles, such as the determination of α hetero values and heteroaggregation rates; more accurate analytical methods instead of DLS for heteroaggregation measurements; sensitive analytical techniques to measure low concentrations of nanoparticles in heteroaggregation systems; appropriate characterization of NOM at the molecular level to understand the structures and fractionation of NOM; effects of different types, concentrations, and fractions of NOM on the heteroaggregation of nanoparticles; the quantitative adsorption and desorption of NOM onto the surface of nanoparticles and heteroaggregates; and a better understanding of the fundamental mechanisms and modeling of heteroaggregation in natural water which is a complex system containing NOM, nanoparticles, biocolloids and geocolloids.

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Section: Biocolloid Geocolloid and Natural Organic Mattermentioning

confidence: 99%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

169

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“…This value was 24% higher than when FeCl 3 was used as coagulant [7]. Other authors found that the coagulation process can reduce haloacetic acid formation potential by 15%-78% [28]. Zhao et al [27] 2013, indicated in their research that the reduction in THMFP and HAAFP by PACl under enhanced coagulation could reach 51% and 59%, respectively, and the removal performance for HAA precursors by PACl was better than when Al 2 (SO 4 ) 3 was used.…”

Section: Methodsmentioning

confidence: 88%

Reduction of haloacetic acids in natural surface water by integrated treatment: coagulation and membrane processes

Sentana-Gadea¹,

Benraouane²,

Aït-Amar³

et al. 2017

Desalination and Water Treatment

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The objectives of this research were to study the elimination of dissolved organic carbon (DOC) and the reduction in the formation of haloacetic acid potential (HAAFP) when natural water from La Pedrera reservoir was treated with a single process of coagulation or filtration membrane, and a combined process ( coagulation followed by treatment with membranes). In this research two coagulants, aluminium sulfate and polyaluminium chloride, and four membranes, two nanofiltration membranes (NF 90 and DESAL HL) and two ultrafiltration membranes (PES 5000 and PES 10000) were studied. The highest reduction in DOC was obtained when the natural water underwent the combined treatment of coagulation followed by NF90 membrane filtration. With this combined treatment the values of DOC rejection were over 82% independently of the coagulant used. For the single treatment with nanofiltration membranes, HAAFP rejection was 81% for NF 90 and 76% for Desal HL. However, a single treatment with coagulation or ultrafiltration membranes showed results for HAAFP rejection of under 35% and 26%, respectively. When a combined treatment of aluminium sulfate followed by ultrafiltration with the PES 5000 membrane was used, HAAFP rejection reached values of 80% approx. These values are very similar to the results obtained from a single treatment with NF 90 but with the advantage that the flux of PES 5000 is 4,000 times the flux of the NF 90 membrane. Therefore, this treatment should be given due consideration.

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“…Ion exchange resins are very proficient at removing humic substances from water supplies as a large fraction of NOM can be characterised as anionic polyelectrolytes [30]. Previous research on the application of MIEX resin for organic matter control has shown that most dissolved organic matter and UV 254 removal occurs in the first 15-30 min [31][32][33]. It was found 30 min of mixing allows easily removable hydrophobic and hydrophilic NOM to exchange with chloride ion without allowing significant interparticle adsorption of NOM on the resin to occur.…”

Section: Removal Of Ha With Different Al-based Coagulants/miex Resinmentioning

confidence: 99%

Evaluation of enhanced coagulation coupled with magnetic ion exchange (MIEX) in natural organic matter and sulfamethoxazole removals: The role of Al-based coagulant characteristic

Wang

et al. 2016

Separation and Purification Technology

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Enhanced coagulation using a magnetic ion exchange resin

Cited by 219 publications

References 21 publications

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Reduction of haloacetic acids in natural surface water by integrated treatment: coagulation and membrane processes

Evaluation of enhanced coagulation coupled with magnetic ion exchange (MIEX) in natural organic matter and sulfamethoxazole removals: The role of Al-based coagulant characteristic

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