Conditions influencing the removal of phosphate from synthetic wastewater: influence of the ionic composition

Hosni, Khaled; Moussa, Sana Ben; Amor, Mohamed Ben

doi:10.1016/j.desal.2006.03.570

Cited by 36 publications

(22 citation statements)

References 8 publications

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“…With a similar behaviour, the phosphate removal is conditioned by pH. It is well-known that phosphate discharged into surface water accelerates eutrophication, which can disturb the balance of organisms present in the water and affect water quality, mainly through the depletion of the oxygen level as the algae decay [9]. As seen in Figure 3, phosphate removal efficiency was directly affected by pH.…”

Section: Figurementioning

confidence: 66%

“…Irdemez et al [10], experimenting with the phosphate removal from wastewaters by electrocoagulation with iron plate electrodes, reported that efficiencies of phosphate removal were 93% in pH 7, and 61% in pH 9. Hosni et al [9] have also shown a variation of the percentage of phosphate removal as a function of pH in synthetic wastewater. Phosphate removal increases with increasing pH, which can be explained by the change of orthophosphate compounds with pH.…”

Section: Figurementioning

confidence: 98%

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Disinfection efficiency of secondary effluents with ultraviolet light in a Mediterranean area

Bayo

Angosto

Ayala

2008

WIT Transactions on Ecology and the Environment

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This paper deals with the study of physicochemical and microbiological parameters affecting the disinfection efficiency of secondary effluents in a municipal wastewater treatment plant, for irrigation purposes. There appears to be an important increase in turbidity values as chlorine values increase, due to the conversion of particulate organic carbon into dissolved organic carbon. The nitrification-denitrification processes appear to be sensitive to changes in pH, with a minimum nitrate value in the wastewater when pH ranged between 7.01 and 8.00. With a similar behaviour, the phosphate removal was conditioned by pH, showing the highest efficiency in the same pH range. Both anions proved to be strongly correlated. Total coliforms were more UV light resistant than faecal coliforms, after an exposure of 10 min, corresponding to an UV dose of 73 mJ/cm 2 . The experimental results for both groups of microorganisms followed first order reaction kinetics, with a gradual flattening at higher UV doses. A total elimination of both indicators would be achieved with doses over 95 mJ/cm 2 . A previous step on the treated wastewater would improve its quality before the disinfection process.

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Section: Figurementioning

confidence: 66%

Section: Figurementioning

confidence: 98%

Disinfection efficiency of secondary effluents with ultraviolet light in a Mediterranean area

Bayo

Angosto

Ayala

2008

WIT Transactions on Ecology and the Environment

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“…Indeed, besides the peaks observed at about 3400 relative to OH À band [51] and at 1440 and 875 cm À1 related to CO 3 2À bands [52], some new peaks were registered at about 1220, 1132, 1057, 600, 576 and 526 cm À1 . These new peaks are related to PO 4 3À bands [53]. On the other hand, SEM and EDS analyses of the formed precipitate demonstrated that it is a crystalline phase mainly formed of Ca, P and O, indicating that it is a calcium phosphate species (Fig.…”

Section: Phosphorus Removal Mechanism Explorationmentioning

confidence: 96%

Raw and treated marble wastes reuse as low cost materials for phosphorus removal from aqueous solutions: Efficiencies and mechanisms

Haddad

Jellali

Jaouadi

et al. 2014

Comptes Rendus. Chimie

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“…There are a lot of factors that may control or influence the precipitation of calcium phosphates in solution, such as the concentrations of PO 4 3 -and Ca 2 + , the pH value (Verbeeck and Devenyns, 1992;Hosni et al, 2007), the ionic strength, the temperature, and the impurities of solution (Feenstra et al, 1981;Melikhov et al, 1989). It is still not very clear how these factors affect the precipitation of calcium phosphates, especially under the conditions of PO 4 3 -recovery from wastewater.…”

Section: Introductionmentioning

confidence: 97%

“…However, efficient P recovery from wastewater is difficult (Song et al, 2007) due to the complicated chemical composition of wastewater (House, 1999) and lack of enough solution chemistry knowledge on the formation of phosphate precipitation (Christoffersen et al, 1989). Under a proper physical and chemical environment (Hosni et al, 2007), different forms of calcium phosphates, such as dicalcium phosphate dehydrate (DCPD, [CaHPO 4 $2H 2 O]), octacalcium phosphate (OCP, [Ca 4 H(PO 4 ) 3 $2.5H 2 O]), tricalcium phosphate (TCP, [Ca 3 (PO 4 ) 2 ]), amorphous calcium phosphate (ACP), and hydroxyapatite (HAP, [Ca 5 (PO 4 ) 3 $OH]), can precipitate from saturated solutions (C xelen et al, 2007;Gustafsson et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Assessment of Effects of Solution Conditions on Precipitation and Recovery of Phosphorus from Wastewater

Song

QianFeng

GaoYing

et al. 2015

Environmental Engineering Science

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Chemical modeling calculations and batch tests were carried out to investigate the effect of solution chemistry on formation of phosphate precipitation in synthetic flushed dairy manure wastewater for phosphorus recovery. Saturation index (SI) of different calcium phosphate precipitates in solution with a PO 4 3 -concentration range of 0.032-9.8 mM (1-300 mg P/L), Ca/P molar ratio of 1-20, pH value of 5.0-12.0, and the CO 3 2 -concentration of 0-100 mM was calculated separately using the geochemical aquatic modeling program, PHREEQC. Results show that the SI of calcium phosphate is the logarithmic function of Ca 2 + and PO 4 3 -concentration, increasing with the increase of Ca 2 + and PO 4 3 -concentrations. SI of calcium phosphate is the polynomial function of the solution pH value. SIs of hydroxyapatite (HAP) and tricalcium phosphate (TCP) increase with the growth of the pH value, while the SIs of octacalcium phosphate (OCP) and dicalcium phosphate dehydrate (DCPD) reach the maximum value at pH 9.0-9.5 and 7.0-7.5, respectively. The SI of calcium phosphate decreases with the growth of the CO 3 2 -concentration following a linear function pattern. Meanwhile, the SI of calcium phosphate decreases with growth of ionic strength following a logarithmic function pattern. In the case study of phosphate removal from synthetic flushed dairy manure wastewater, the PO 4 3 -removal trend under a different pH value and Ca/P molar ratios was closer to the predictions of thermodynamic modeling. CO 3 2 -can affect the PO 4 3 -removal efficiency and turn on the marked inhibiting effect on HAP growth, but does not obviously affect the structure of the precipitate.

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Conditions influencing the removal of phosphate from synthetic wastewater: influence of the ionic composition

Cited by 36 publications

References 8 publications

Disinfection efficiency of secondary effluents with ultraviolet light in a Mediterranean area

Disinfection efficiency of secondary effluents with ultraviolet light in a Mediterranean area

Raw and treated marble wastes reuse as low cost materials for phosphorus removal from aqueous solutions: Efficiencies and mechanisms

Thermodynamic Assessment of Effects of Solution Conditions on Precipitation and Recovery of Phosphorus from Wastewater

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