Adsorptive Removal of Nitrate and Phosphate from Water by a Purolite Ion Exchange Resin and Hydrous Ferric Oxide Columns in Series

Gupta, Meenal; Loganathan, P.; Vigneswaran, S.

doi:10.1080/01496395.2012.658487

Cited by 34 publications

(14 citation statements)

References 31 publications

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“…Different research efforts during the last decade, have probed that phosphorus recovery at low levels (e.g. 2-10 mg/L), from domestic and urban waste waters is not economically feasible, using conventional removal processes (coagulation, chemical precipitation, adsorption, ionexchange) [2,4,5]. However, the introduction of new processes using P-selective sorbents (e.g.…”

Section: Phosphorus Management Has Been Recently Highlighted By the Umentioning

confidence: 99%

Evaluation of hydroxyapatite crystallization in a batch reactor for the valorization of alkaline phosphate concentrates from wastewater treatment plants using calcium chloride

Hermassi

Valderrama

Dosta

et al. 2015

Chemical Engineering Journal

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Section: Phosphorus Management Has Been Recently Highlighted By the Umentioning

confidence: 99%

Evaluation of hydroxyapatite crystallization in a batch reactor for the valorization of alkaline phosphate concentrates from wastewater treatment plants using calcium chloride

Hermassi

Valderrama

Dosta

et al. 2015

Chemical Engineering Journal

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“…Generally, ion exchangers are able to effectively remove nitrate from water, but they have not been successful in removing phosphate. For example, Gupta et al [5] reported that Purolite 500A anion exchange resin had a Langmuir adsorption capacity of 64 mg N/g for nitrate adsorption whereas it had only 7 mg P/g for phosphate adsorption. Therefore, they used two columns in series, one with Purolite for removing nitrate followed by the other with hydrous ferric oxide for the removal of phosphate from water containing both these anions.…”

Section: Introductionmentioning

confidence: 99%

Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin

Nur

Johir

Loganathan

et al. 2014

Journal of Industrial and Engineering Chemistry

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112

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Removing phosphate from water is important as it causes eutrophication, which in turn has a harmful effect on aquatic life, resulting in a reduction in biodiversity. On the other hand, recovery of phosphate from phosphorus containing wastewater is essential for developing an alternative source of phosphorus to overcome the global challenge of phosphorus scarcity.Phosphate removal from aqueous solutions was studied using an iron oxide impregnated strong base anion exchange resin, Purolite FerrIX A33E in batch and fixed-bed column experiments. Phosphate adsorption in the batch study satisfactorily fitted to the Langmuir isotherm with a maximum adsorption capacity of 48 mg P/g. In the column study, increase in inlet phosphate concentration (5-30 mg P/L), and filtration velocity (2.5-10 m/h) resulted in faster breakthrough times and increase in breakthrough adsorption capacities. Increase in bed height (3-19 cm) also increased adsorption capacity but the breakthrough time was slower.The breakthrough data were reasonably well described using the empirical models of Bohart-2 Adams, Thomas, and Yoon-Nelson, except for high bed heights. Phosphate adsorbed was effectively desorbed using 1M NaOH and the adsorbent was regenerated after each of three adsorption/desorption cycles by maintaining the adsorption capacity at > 90% of the original value. Greater than 99.5% of the desorbed P was recovered by precipitation using CaCl 2 .

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“…Hamoudi et al [ 28 ] produced an ammonium functionalised mesoporous silica compound called MCM-48 and reported that it had a maximum adsorption capacity of 15.5 mg/g at pH 6.0. Gupta et al [ 29 ] discovered that Purolite A500P anion exchange resin had a Langmuir adsorption capacity of 21 mg/g for phosphate at pH 7.5. These literature values were obtained from experiments conducted on synthetic waters containing only phosphate, whereas the current study was conducted using MBR treated water containing other anions as well.…”

Section: Resultsmentioning

confidence: 99%

Phosphate Adsorption from Membrane Bioreactor Effluent Using Dowex 21K XLT and Recovery as Struvite and Hydroxyapatite

Nur

Loganathan

Kandasamy

et al. 2016

IJERPH

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Discharging phosphate through wastewaters into waterways poses a danger to the natural environment due to the serious risks of eutrophication and health of aquatic organisms. However, this phosphate, if economically recovered, can partly overcome the anticipated future scarcity of phosphorus (P) resulting from exhaustion of natural phosphate rock reserves. An experiment was conducted to determine the efficiency of removing phosphate from a membrane bioreactor effluent (pH 7.0–7.5, 20, 35 mg phosphate/L) produced in a water reclamation plant by adsorption onto Dowex 21K XLT ion exchange resin and recover the phosphate as fertilisers. The data satisfactorily fitted to Langmuir adsorption isotherm with a maximum adsorption capacity of 38.6 mg·P/g. The adsorbed phosphate was quantitatively desorbed by leaching the column with 0.1 M NaCl solution. The desorbed phosphate was recovered as struvite when ammonium and magnesium were added at the molar ratio of phosphate, ammonium and magnesium of 1:1:1 at pH 9.5. Phosphate was also recovered from the desorbed solution as hydroxyapatite precipitate by adding calcium hydroxide to the solution at a phosphate to calcium molar ratio of 1:2 at pH 7.0. The P contents of struvite and hydroxyapatite produced were close to those of the respective commercial phosphate fertilisers.

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Adsorptive Removal of Nitrate and Phosphate from Water by a Purolite Ion Exchange Resin and Hydrous Ferric Oxide Columns in Series

Cited by 34 publications

References 31 publications

Evaluation of hydroxyapatite crystallization in a batch reactor for the valorization of alkaline phosphate concentrates from wastewater treatment plants using calcium chloride

Evaluation of hydroxyapatite crystallization in a batch reactor for the valorization of alkaline phosphate concentrates from wastewater treatment plants using calcium chloride

Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin

Phosphate Adsorption from Membrane Bioreactor Effluent Using Dowex 21K XLT and Recovery as Struvite and Hydroxyapatite

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