Phosphate removal from water by fly ash: Factorial experimental design

Can, Mevra Yalvac; Yildiz, Ergün

doi:10.1016/j.jhazmat.2005.11.036

Cited by 74 publications

(25 citation statements)

References 19 publications

(39 reference statements)

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“…Phosphorus adsorption capacity of slagCSH after 24 h of adsorption was determined to be 53.11 P-mg/g, which was 73 times greater than that of BF slag. This phosphorus adsorption capacity is markedly higher than those previously reported on solid adsorbents derived from minerals and industrial wastes, [9][10][11][12][13][14] demonstrating its excellent adsorption ability toward phosphate ions in water. PureCSH as a reference sample exhibited a higher phosphorus adsorption capacity (86.23 P-mg/g) than slagCSH irrespective of its subpar structural properties (S BET = 154 m 2 /g, V total = 0.62 cm 3 /g).…”

Section: Adsorption Of Phosphatecontrasting

confidence: 53%

Phosphate Removal from Aqueous Solutions Using Calcium Silicate Hydrate Prepared from Blast Furnace Slag

Kuwahara

Yamashita

2017

ISIJ International

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Section: Adsorption Of Phosphatecontrasting

confidence: 53%

Phosphate Removal from Aqueous Solutions Using Calcium Silicate Hydrate Prepared from Blast Furnace Slag

Kuwahara

Yamashita

2017

ISIJ International

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“…Previous results have shown that substrate adsorption plays the most important role in P immobilization [4][5][6][7][8]. Therefore, cheap and effective P adsorbents are highly desirable [9][10][11].The most commonly used substrates in CWs are quartz sands [12], activated carbon (AC) [12][13], zeolite [14], ceramic [15], and furnace slag [16][17], and prior research has shown that the removal of P by these substrates mainly occurs though physical adsorption, chemical precipitation, and ion exchange [10][11]. However, P sorption properties of the substrates have not been systematically estimated, which resulted in many defective packing layer designs for CWs [3,11].…”

mentioning

confidence: 99%

Phosphorus Adsorption Capacity Evaluation for the Substrates Used in Constructed Wetland Systems: a Comparative Study

Hirata¹,

Hu²

2017

Pol. J. Environ. Stud.

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CWs have been designed and constructed to use natural processes for the removal of pollutants from contaminated water in a more controlled environment [1][2][3]. Previous results have shown that substrate adsorption plays the most important role in P immobilization [4][5][6][7][8]. Therefore, cheap and effective P adsorbents are highly desirable [9][10][11].The most commonly used substrates in CWs are quartz sands [12], activated carbon (AC) [12][13], zeolite [14], ceramic [15], and furnace slag [16][17], and prior research has shown that the removal of P by these substrates mainly occurs though physical adsorption, chemical precipitation, and ion exchange [10][11]. However, P sorption properties of the substrates have not been systematically estimated, which resulted in many defective packing layer designs for CWs [3,11]. Thus, it is important to evaluate the P adsorption properties of the substrates before full-scale use was performed.Pol. J. Environ. Stud. Vol. 26, No. 3 (2017) AbstractTo provide a selection criteria to choose substrates according to the quality of the water requiring treatment in constructed wetlands (CWs), phosphorus (P) adsorption properties of four quartz sands with different physicochemical characteristics and four substrates commonly used in CWs were tested and evaluated via both the Langmuir and Freundlich equations. The effects of organic maters (OM) on P adsorption capacities of the substrates were also studied to evaluate the practical values of the substrates. The Langmuir sorption isotherm was used to estimate the P adsorption capacities of the tested substrates in CWs. Overall, the maximum P adsorption for all of the tested substrates decreased as follows: furnace slag > ceramic > zeolite > activated carbon > quartz quartz sands. The P adsorption capacities were significantly influenced by grain size; specific surface area; Fe, Al, Mg, and Ca contents in the substrates; and the amount of added OM. The chemical precipitation of P by the substrates containing Fe was more effective than those containing Ca at the same level. Added OM impacts P sorption by influencing pH, and substrates containing higher Fe and Al concentrations and lower Ca concentrations were more resistant to decreases in the P adsorption capacities due to OM accumulation. Finally, a principle for selecting substrates for the treatment of wastewater with different characteristics was determined.

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“…When the second degree polynomial equation is analyzed (Equation 5), it is known that the parameter with a greater coefficient has a greater effect on the biosorption. A positive sign shows that parameters and dependent variables are directly related (Can and Yildiz 2006). Thus, it was observed that, when the value of a factor is increased from a lower level to a higher level, metal retaining effect increased as well.…”

Section: Effect Of Primary Parameters On Biosorptionmentioning

confidence: 96%

Untitled

Celik¹,

Camas²,

Camas³

et al. 2016

Turk. J. Fish. Aquat. Sci.

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The biosorption of heavy metals, radionuclides, uranium and thorium for the recovery or removal from aqueous systems using various micro-organisms and biological substances has been investigated by several groups of workers. In this paper, the uptake of uranium (VI) from aqueous systems by a marine sponge, Sarcotragus foetidus (Schmidt, 1862) has been investigated. S. foetidus samples were collected from Babakale/Ayvacık/Canakkale in Turkey. Uranium (VI) uptake experiments were carried out by the batch technique. The affecting parameters were analyzed using Central Composite Design (CCD) as the experimental method. Four independent variables such -pH, temperature, contact time, and initial uranium concentration were selected for this study. The influences of initial pH, contact time, and initial uranium concentration on the biosorption process were considered statistically significant as main effects. On the other hand, interaction effects of pH and contact time, as well as pH and initial uranium concentration, were considered as significant parameters on the biosorption process. The optimum condition of biosorption process was found to be at init"ial pH: 4, temperature: 35°C, initial uranium concentration: 20 mg/L, and contact time: 31 minutes. At these conditions, the biosorption yield of uranium (VI) ions was obtained to be 93.29±2%.Keywords: Marine sponge, Statistical design, Experimental Design, Analysis of variance (ANOVA), biological sorption. Sarcotragus foetidus (Schmidt, 1862) Denizel Süngeri ile Uranyum (VI) Biyosorpsiyonunun Merkezi Kompozit Dizayn ile İstatistiksel Olarak Araştırılması ÖzetMikroorganizmalar ve biyolojik materyaller kullanarak radyonüklitlerin, ağır metallerin, toryum ve uranyum gibi radyoaktif metallerin sulu çözeltilerden geri alınması veya uzaklaştırılması üzerine birçok çalışma vardır. Bu çalışmada, Sarcotragus foetidus (Schmidt, 1862) olarak adlandırılan deniz süngerinin sulu çözeltilerden uranyum alımı istatistiksel olarak araştırıldı. S. foetidus (Schmidt, 1862) deniz süngeri örnekleri Babakale (Ayvacık / Çanakkale) açıklarından toplandı. Uranyum (VI) geri alım denemeleri kesikli yöntem ile gerçekleştirildi. Biyosorpsiyonu etkileyen parametreler Merkezi Kompozit Deneysel Tasarımı (CCD) kullanılarak analiz edildi. Bu çalışma için; pH, sıcaklık, temas süresi ve uranyum başlangıç konsantrasyonu gibi dört bağımsız değişken seçildi. Ana parametrelerden pH, temas süresi ve uranyum başlangıç konsantrasyonu biyosorpsiyon prosesinde istatistiksel olarak anlamlı olarak kabul edildi. Diğer bir yandan; biyosorpsiyon işlemi üzerinde, pH-temas süresi, pH -uranyum başlangıç konsantrasyonu gibi ikili etkileşimler önemli parametreler olarak belirlendi. Biyosorbsiyon prosesinin optimum koşulları; pH:4, sıcaklık: 38 , uranyum başlangıç konsantrasyonu: 20 mg/L ve temas süresi: 31 dakika olarak hesaplandı. Bu koşullar altında biyosorpsiyon verimi % 93.29±2 olarak elde edildi.

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Phosphate removal from water by fly ash: Factorial experimental design

Cited by 74 publications

References 19 publications

Phosphate Removal from Aqueous Solutions Using Calcium Silicate Hydrate Prepared from Blast Furnace Slag

Phosphate Removal from Aqueous Solutions Using Calcium Silicate Hydrate Prepared from Blast Furnace Slag

Phosphorus Adsorption Capacity Evaluation for the Substrates Used in Constructed Wetland Systems: a Comparative Study

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