Phosphorus removal by fly ash

Uğurlu, Ayşenur

doi:10.1016/s0160-4120(98)00079-8

Cited by 207 publications

(114 citation statements)

References 8 publications

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“…A large number of materials from natural minerals to synthetic ones have been used as adsorbents to adsorb phosphate from wastewater [11][12][13][14][15]. Recently, the application of low cost and easily available materials for phosphate removal has been widely investigated, such as fly ash [16][17][18], blast furnace slag [19][20][21], iron oxide tailing [22], red mud [23,24], Ca-based adsorbents, and iron-based compounds [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Zhang

Liu

et al. 2009

Journal of Colloid and Interface Science

386

155

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a b s t r a c tPhosphate removal is important in the control of eutrophication of water bodies and adsorption is one of the promising approaches for this purpose. A Fe-Mn binary oxide adsorbent with a Fe/Mn molar ratio of 6:1 for phosphate removal was synthesized by a simultaneous oxidation and coprecipitation process. Laboratory experiments were carried out to investigate adsorption kinetics and equilibrium, in batch mode. The effects of different experimental parameters, namely contact time, initial phosphate concentration, solution pH, and ionic strength on the phosphate adsorption were investigated. The adsorption data were analyzed by both Freundlich and Langmuir isotherm models and the data were well fit by the Freundlich isotherm model. Kinetic data correlated well with the pseudo-second-order kinetic model, suggesting that the adsorption process might be chemical sorption. The maximal adsorption capacity was 36 mg/g at pH 5.6. The phosphate adsorption was highly pH dependent. The effects of anions such as Cl À ; SO 4 2À , and CO 3 2À on phosphate removal were also investigated. The results suggest that the presence of these ions had no significant effect on phosphate removal. The phosphate removal was mainly achieved by the replacement of surface hydroxyl groups by the phosphate species and formation of inner-sphere surface complexes at the water/oxide interface. In addition, the adsorbed phosphate ions can be effectively desorbed by dilute NaOH solutions. This adsorbent, with large adsorption capacity and high selectivity, is therefore a very promising adsorbent for the removal of phosphate ions from aqueous solutions.

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Section: Introductionmentioning

confidence: 99%

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Zhang

Liu

et al. 2009

Journal of Colloid and Interface Science

386

155

View full text Add to dashboard Cite

show abstract

“…More recently some researchers studied the feasibility of phosphate adsorption from phosphate-rich streams. The various adsorbents used include industrial materials and byproducts (i.e., iron oxide tailings [5], fly ash [6], blast furnace slag [7] and red mud [8]), natural or synthetic minerals (i.e., goethite [9,10], dolomite [11] and alunite [12]), metal oxide/hydroxide (i.e., aluminum oxide, iron oxide, zirconium oxide [13] and zirconium hydroxide [14]) and other materials (i.e., ion exchange resin [15]). …”

Section: Introductionmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

207

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a b s t r a c tA series of layered double hydroxides (LDHs) with different metal cations were synthesized to remove phosphate in waste sludge filtrate from a municipal wastewater treatment plant for phosphorus recovery and to help control eutrophication. The highest phosphate adsorption capacity was obtained by using Zn-Al-2-300, that is LDHs with Zn/Al molar ratio of 2 and calcined at 300 • C for 4 h. Circumneutral and mildly alkaline waters appeared suitable for the possible application of Zn-Al LDHs due to the amphoteric nature of aluminum hydroxide. Phosphate adsorption from the sludge filtrate by the LDHs followed pseudo-second-order kinetics, and the adsorption capacity at equilibrium was determined to be ∼50 mg P/g. Adsorption isotherms showed that phosphate uptake in this study was an endothermic process and had a good fit with a Langmuir-type model. The absorbed phosphate can be effectively desorbed (more than 80%) from LDHs particles by a 5 wt% NaOH solution. The regeneration rate of used LDHs was ∼60% after six cycles of adsorption-desorption-regeneration.

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“…Low cost materials including blast furnace slag (Johansson and Gustafsson, 2000), red mud (Baker et al, 1998), alum sludge (Galarneau and Gehr, 1997), natural soil (Stuanes, 1984), fly ash (Ugurlu and Salman, 1998), and limestone (Higgins et al, 1976;Kuo and Lotse, 1972) were tested as P removal agents in the wastewater treatment process. These materials efficiently removed P from wastewater, and major components in the materials for P removal were identified to be Al hydroxide, Fe oxide, calcium oxide, and calcium carbonate.…”

Section: Introductionmentioning

confidence: 99%