Selenium adsorption to aluminum-based water treatment residuals

Ippolito, James A.; Scheckel, Kirk G.; Barbarick, K. A.

doi:10.1016/j.jcis.2009.06.023

Cited by 107 publications

(52 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The K value obtained using WTR in this experiment was at least 4-6-times higher than that reported using aluminum oxide of a similar particle size range [17]. This could be due to the relatively higher Al content (157.9 g/kg) in the local WTR, which was about two-times more than that reported in other WTR materials [22]. Higher Al oxide content had been demonstrated to achieve higher PO4 3− -P adsorption.…”

Section: Water Quality Analysescontrasting

confidence: 51%

Aluminum-Based Water Treatment Residue Reuse for Phosphorus Removal

Lee

Wang

Guo

et al. 2015

Water

View full text Add to dashboard Cite

Aluminum-based water treatment residue (Al-WTR) generated during the drinking water treatment process is a readily available recycled material with high phosphorus (P) adsorption capacity. The P adsorption capacity of Al-WTR generated from Singapore's water treatment plant was evaluated with reference to particle size range, adsorption pH and temperature. Column tests, with WTR amendments in sand with and without compost, were used to simulate the bioretention systems. The adsorption rate decreased with increasing WTR sizes. Highest P adsorption capacity, 15.57 mg PO4 3− -P/g WTR, was achieved using fine WTR particles (>50% particles at less than 0.30 mm). At pH 4, the contact time required to reduce effluent P concentration to below the detectable range was half compared with pH 7 and 9. The adsorption rate observed at 40 ± 2 °C was 21% higher compared with that at 30 ± 2 °C. Soil mixes amended with 10% WTR and compost were able to maintain consistently high (90%) total phosphorus (TP) removal efficiency at a TP load up to 6.45 g/m 3 . In contrast, TP removal efficiencies associated with columns without WTR amendment decreased to less than 45% as the TP load increased beyond 4.5 g/m 3. The results showed that WTR application is beneficial for enhanced TP removal in bioretention systems.

show abstract

Section: Water Quality Analysescontrasting

confidence: 51%

Aluminum-Based Water Treatment Residue Reuse for Phosphorus Removal

Lee

Wang

Guo

et al. 2015

Water

View full text Add to dashboard Cite

show abstract

“…Beneficial reuse of the material would reduce both the cost and need for disposal. Water treatment sludge has recently been used as an effective adsorbent for anions such as phosphate Babatunde et al 2009), selenite, selenate (Ippolito et al 2009), arsenite, arsenate (Makris et al 2009) and perchlorate (Makris et al 2006) as well as the cations Pb(II) and (Chu 1999) Hg(II) (Hovsepyan and Bonzongo 2009).…”

Section: Introductionmentioning

confidence: 99%

Removal of Pb(II), Cr(III) and Cr(VI) from Aqueous Solutions Using Alum-Derived Water Treatment Sludge

Zhou

Haynes

2010

Water Air Soil Pollut

123

View full text Add to dashboard Cite

The sorption of Pb(II), Cr(III) and Cr(VI) from aqueous solution using alum-derived water treatment sludge was investigated using the batch adsorption technique. Samples of sludge from two separate water treatment plants were used (one where alum was used alone and one where it was used in combination with activated C). The sorption characteristics of the two samples were generally very similar. Sorption isotherm data for all three ions fitted equally well to both Freundlich and Langmuir equations. Maximum sorption capacity and indices of sorption intensity both followed the order: Cr(III)>Pb(II)>Cr(VI). Kinetic data correlated well with a pseudo-second-order kinetic model suggesting the process involved was chemisorption. Sorption was pH-dependant with percentage sorption of Cr(III) and Pb(II) increasing from <30% to 100% between pH3 and 6 whilst that of Cr(VI) declined greatly between pH5 and 8. HNO 3 at a concentration of 0.1 M was effective at removing sorbed Cr(III) and Pb (II) from the sludge surfaces and regeneration was successful for eight sorption/removal cycles. It was concluded that water treatment sludge is a suitable material from which to develop a low-cost adsorbent for removal of Cr and Pb from wastewater streams.

show abstract

“…A variety of treatment methods have been studied for Se removal from contaminated waters, including ion-exchange [9], reverse osmosis [10], zero-valent iron [11], microbial reduction [12], chemical precipitation [13], a hybrid electro-coagulation membrane process [14] and adsorption [15][16][17][18][19][20][21][22][23]. Among these, adsorption is believed to be the most promising process and has been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

“…Among these, adsorption is believed to be the most promising process and has been studied extensively. Metal oxides such as various iron (Fe) oxides and aluminum (Al) oxide have been demonstrated to be effective adsorbents for Se removal [15,18,20,[22][23][24]. Coagulation by Al and Fe salts is an important water treatment process and has been widely used in drinking water plants.…”

Section: Introductionmentioning

confidence: 99%

Removal of Se(IV) and Se(VI) from drinking water by coagulation

Chen

et al. 2015

Separation and Purification Technology

View full text Add to dashboard Cite

a b s t r a c t Selenium (Se) is one of contaminants required to be regulated during drinking water treatment, however, little information has been collected to date regarding Se removal by coagulation. In this study, the performance of Se removal by coagulation has been evaluated with respect to the dependence on Se species, coagulant type, water pH and interfering ions. The results showed that a Fe-based coagulant was much more efficient than Al-based coagulants in Se removal. The removal of selenite (Se(IV)) by coagulation was much more pronounced than that of selenate (Se(VI)). With an FC dosage of more than 0.4 mM Fe/L, Se(IV) removal efficiency of more than 98% could be achieved when the initial Se(IV) concentration was 250 lg/L. For Al-based coagulants (AlCl 3 (AC) and polyaluminum chloride (PACl)) Se removal efficiency was positively correlated with the content of Al 13 species during the coagulation process. Adsorption onto hydroxide flocs was the most active coagulation mechanism for Se removal and precipitation also played specific roles at low dosage, especially for Se(IV) removal and with Fe coagulant. High coagulant dosage and weakly acidic pH could enhance the formation of hydroxide flocs having more active adsorption sites and high zeta potential, and thus favored Se removal. These findings are important to understand the efficiency and mechanisms of Se removal by coagulation.

show abstract

Selenium adsorption to aluminum-based water treatment residuals

Cited by 107 publications

References 39 publications

Aluminum-Based Water Treatment Residue Reuse for Phosphorus Removal

Aluminum-Based Water Treatment Residue Reuse for Phosphorus Removal

Removal of Pb(II), Cr(III) and Cr(VI) from Aqueous Solutions Using Alum-Derived Water Treatment Sludge

Removal of Se(IV) and Se(VI) from drinking water by coagulation

Contact Info

Product

Resources

About