Journal ArticleDOI
Integrated ion exchange/catalytic process for efficient removal of nitrates from drinking water
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In this paper, a nitrate removal process that drastically reduces salt consumption and waste discharge has been developed on a bench scale, where Nitrate is removed by chloride ion-exchange, and the strong-base anion resin is completely regenerated at mild reaction conditions (i.e., ambient temperature, atmospheric pressure) in a closed circuit containing a single-flow fixed-bed reactor packed with a Pd-Cu/γ-Al 2 O 3 catalyst.About:
This article is published in Chemical Engineering Science.The article was published on 2001-02-01. It has received 120 citations till now. The article focuses on the topics: Water treatment & Denitrification.read more
Citations
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Journal ArticleDOI
Removal of nitrate from aqueous solution by nitrate selective ion exchange resins
TL;DR: In this paper, the authors presented experimental results on the removal of nitrate by nitrate selective ion exchange resin, Purolite A 520E. The results showed that the presence of chloride and sulfate ions influenced the breakthrough capacity of the resin for nitrate removal.
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Critical Review of Pd-Based Catalytic Treatment of Priority Contaminants in Water
Brian P. Chaplin,Martin Reinhard,William F. Schneider,Christoph Schüth,John R. Shapley,Timothy J. Strathmann,Charles J. Werth +6 more
TL;DR: This review critically analyzes the published research in the area of Pd-based catalytic reduction of priority drinking water contaminants, and identifies key research areas that should be addressed.
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Hydrogenation of Nitrate in Water to Nitrogen over Pd–Cu Supported on Active Carbon
TL;DR: In this paper, the authors used Pd-Cu catalysts at 333 K in a flow system to remove nitrate in water by hydrogenation and found that Pd and Cu were not dissolved when supported on active carbon, even at low pH reaction conditions.
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Removal of nitrate from aqueous solution by using red mud
TL;DR: In this article, the effects of pH, adsorbent dosage and contact time on the adsorption of activated red mud were investigated, and it was found that sufficient time for adorption equilibrium of nitrate ions is 60 min.
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Catalytic nitrate removal from water, past, present and future perspectives
Noelia Barrabés,Jacinto Sá +1 more
TL;DR: An overview of past and present research in the field and some key areas, which should be addressed to improve current and newly developed systems are presented in this article, where the problematic of ammonium byproduct formation is yet to be solved.
References
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Estimation of the point of zero charge of simple oxides by mass titration
Joong S. Noh,James A. Schwarz +1 more
TL;DR: In this paper, a method is proposed to estimate the point of zero charge (pzc) of pure compounds which can be described accurately by the surface ionization model of amphoteric oxides.
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Nitrate Removal From Drinking Water—Review
Anoop Kapoor,T. Viraraghavan +1 more
TL;DR: In this paper, the authors reviewed the developments in the field of nitrate removal processes and concluded that ion exchange and biological denitrification are more acceptable for ground water than reverse osmosis.
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Catalytic hydrogenation of aqueous nitrate solutions in fixed-bed reactors
Albin Pintar,Jurka Batista +1 more
TL;DR: In this paper, the authors investigated catalytic nitrate reduction in isothermal fixed-bed reactors at T ǫ=298 K and atmospheric pressure, and demonstrated that nitrates can be efficiently removed from the liquid-phase, and that the maximum contaminant level for ammonium ions in drinking water is not exceeded.
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Hardness and Salt Effects on Catalytic Hydrogenation of Aqueous Nitrate Solutions
TL;DR: In this article, hardness and salt effects on both the nitrate disappearance rate and the reaction selectivity were quantitatively evaluated for a wide range of nitrate conversions in an isothermal semibatch slurry reactor.
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Ion Exchange for Nitrate Removal
Dennis Cliford,Xiaosha Liu +1 more
TL;DR: This research indicates that the combination procedure results in 50 percent reduction of regenerant consumption and 90 percent reduction in the mass of waste salt discharged.