Efficient treatment of ammonia-nitrogen contaminated waters by nano zero-valent iron/zeolite composite

Eljamal, Osama; Eljamal, Ramadan; Maamoun, Ibrahim; Khalil, Ahmed M.E.; Shubair, Tamer; Falyouna, Omar; Sugihara, Yuji

doi:10.1016/j.chemosphere.2021.131990

Cited by 87 publications

(26 citation statements)

References 47 publications

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“…For both isotherm models, Akaike Information Criterion (AIC) was estimated to examine the goodness of model fittings as a function of the sum of the squared errors [32,33]. Lower AIC values indicate a better-fitting model [33,34].…”

Section: Phosphate Adsorption Isothermmentioning

confidence: 99%

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

et al. 2022

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There has been increasing interest in using biochar for nutrient removal from water, and its application for anionic nutrient removal such as in phosphate (PO43−) necessitates surface modifications of raw biochar. This study produced avocado seed biochar (AB), impregnated Fe- or Mg-(hydr)oxide onto biochar (post-pyrolysis), and tested their performance for aqueous phosphate removal. The Fe- or Mg-loaded biochar was prepared in either high (1:8 of biochar to metal salt in terms of mass ratio) or low (1:2) loading rates via the co-precipitation method. A total of 5 biochar materials (unmodified AB, AB + High Fe, AB + Low Fe, AB + High Mg, and AB + Low Mg) were characterized according to their selected physicochemical properties, and their phosphate adsorption performance was tested through pH effect and adsorption isotherm experiments. Fe-loaded AB contained Fe3O4, while Mg-loaded AB contained Mg(OH)2. The metal (hydr)oxide inclusion was higher in Fe-loaded AB. Mg-loaded AB showed a unique free O–H functional group, while Fe-loaded AB showed an increase in its specific surface area more than 10-times compared to unmodified AB (1.8 m2 g−1). The effect of the initial pH on phosphate adsorption was not consistent between Fe-(anion adsorption envelope) vs. Mg-loaded AB. The phosphate adsorption capacity was higher with Fe-loaded AB in low concentration ranges (≤50 mg L−1), while Mg-loaded AB outperformed Fe-loaded AB in high concentration ranges (75–500 mg L−1). The phosphate adsorption isotherm by Fe-loaded AB fit well with the Langmuir model (R2 = 0.91–0.96), indicating the adsorptive surfaces were relatively homogeneous. Mg-loaded biochar, however, fit much better with Freundlich model (R2 = 0.94–0.96), indicating the presence of heterogenous adsorptive surfaces. No substantial benefit of high loading rates in metal impregnation was found for phosphate adsorption. The enhanced phosphate removal by Mg-loaded biochar in high concentration ranges highlights the important role of the chemical precipitation of phosphate associated with dissolved Mg2+.

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Section: Phosphate Adsorption Isothermmentioning

confidence: 99%

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

et al. 2022

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“…The adsorption method has been widely adopted as a phosphorus capture process because of its effectiveness in phosphorus removal and low cost as well as its applicability and scalability as a phosphorus recovery process. − As one of the preferred adsorbents, iron-based materials have attracted extensive attention because of the selective adsorption of phosphorus. − Nanoscale zero-valent iron (nZVI), for example, has high affinity for phosphate with a maximum adsorption capacity of 245 mg P/g . Due to its magnetic properties, nZVI can be easily separated from the solution using an external magnetic field, eliminating the problem of difficult recovery and secondary pollution. , However, the poor chemical and mechanical properties of nZVI, such as easy oxidation and aggregation, have limited its application in aqueous media for phosphorus removal. − …”

Section: Introductionmentioning

confidence: 99%

Nanoscale Zero-Valent Iron Confined in Anion Exchange Resins to Enhance Selective Adsorption of Phosphate from Wastewater

et al. 2022

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The removal and recovery of phosphorus from wastewater are crucial for reducing eutrophication and alleviating phosphate rock depletion. In this study, nanoscale zero-valent iron (nZVI) confined in Alfa Aesar Amberlite IRA-402 (Cl) anion exchange resin composite adsorbents was developed by in situ reduction and deposition (denoted as nZVI-402-Cl) to remove phosphate from simulated and real wastewater. Surface and structure characterizations revealed that nZVI particles with a partially oxidized surface were loaded on the surface and inside the anion exchange resin. The phosphate adsorption capacity of nZVI-402-Cl was found to be high over a wide pH range (3.0–11.0), with a maximum adsorption capacity of 56.27 mg P/g at pH 7.2. Despite the presence of interfering sulfate and nitrate anions, nZVI-402-Cl maintained its high phosphate adsorption capacity owing to its excellent selectivity. The confinement of nZVI in anion exchange resins, in particular, could reduce the negative effects of humic acid on phosphate removal. After five regeneration/use cycles, the phosphate removal of nZVI-402-Cl was maintained close to 95%. In column mode tests, the nZVI-402-Cl column process generates ∼1850 bed volume (BV) clean water ([phosphorus] < 0.1 mg/L) from the wastewater treatment plant effluents. In contrast, the value of the IRA-402 column is only ∼900 BV. nZVI-402-Cl has proven to be an efficient and selective adsorbent for practical phosphate removal and recovery in different water environments.

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“…Advanced treatment processes include membrane separation technology [9], the biological treatment method [10], and so on. Nanoporous materials are also commonly used to remove contaminants from wastewater [11][12][13]. With the improvement of environmental protection requirements, the concept of zero liquid discharge has also been encouraged for several saline wastewater sources, such as desalination brine and textile wastewater [14,15].…”

Section: Introductionmentioning

confidence: 99%

Economic Analysis of Atomization Drying of Concentrated Solution Based on Zero Discharge of Desulphurization Wastewater

Zhao

Feng

et al. 2022

Water

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With the improvement of environmental protection requirements, more and more attention has been given to desulphurization wastewater with zero discharge in coal power plants. Atomization drying is part of the main zero discharge technologies at present. Economic analysis of the atomization drying of desulphurization wastewater is beneficial to the formulation of an appropriate operation scheme and to the reduction of operation costs. The economic analysis and sensitivity analysis of different operating conditions such as unit load, the handling capacity of concentrates, and the temperature of the extracted flue gas in the atomization drying process of concentrated desulfurized wastewater were carried out in this paper. The main cost of the drying process came from the influence of flue gas extraction on the overall heat transfer in the boiler, resulting in the decrease in power generation revenue, which can reach more than 80%. The operating cost of auxiliary machinery was relatively low. The cost of treatment for per ton of concentrates increased first and then decreased with the increase in temperature of the extracted flue gas, and it decreased with the increase in the handling capacity of the concentrates. The effect of a unit load on the treatment cost was also related to the temperature of the extracted flue gas, and the optimal flue gas temperature increase to higher temperatures as the unit load decreased. The minimum treatment costs per ton of concentrate ranged from CNY 143.54/t to CNY 158.77/t under different unit loads. Sensitivity analysis showed that the temperature of the extracted flue gas had the greatest impact on treatment cost, and its sensitivity coefficient was 0.0834. The ways in which to improve economic benefits were discussed.

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Efficient treatment of ammonia-nitrogen contaminated waters by nano zero-valent iron/zeolite composite

Cited by 87 publications

References 47 publications

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

Nanoscale Zero-Valent Iron Confined in Anion Exchange Resins to Enhance Selective Adsorption of Phosphate from Wastewater

Economic Analysis of Atomization Drying of Concentrated Solution Based on Zero Discharge of Desulphurization Wastewater

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