Remediation of contaminated land by formation of heavy metal phosphates

Cotter-Howells, Janet; Caporn, S. J. M.

doi:10.1016/0883-2927(95)00042-9

Cited by 245 publications

(119 citation statements)

References 9 publications

Supporting

Mentioning

108

Contrasting

Unclassified

Order By: Relevance

“…Recently, this P-based approach to the remediation of Pb-contaminated soils has been widely used [1][2][3]. This technique is of particular interest because of its cost-effectiveness and less disruptive nature [4,5]. Significant effort has been made to evaluate the effectiveness of P on in situ remediation of contaminated soils and waters [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The effect of grain size of rock phosphate amendment on metal immobilization in contaminated soils

Chen

Zhu

2006

Journal of Hazardous Materials

View full text Add to dashboard Cite

When rock phosphates (RP) are used to remediate Pb-contaminated soils, their effectiveness is likely affected by their grain size. In this study, the effect of grain size of rock phosphate on the effectiveness of heavy metal immobilization in two contaminated soils was measured in pot experiment. Rock phosphate was used with four different grain sizes: <35, 35-72, 72-133 and 133-266 m. The application rate of rock phosphate in two soils was determined based on P/metals (Pb, Zn, Cu and Cd) molar ratio of 5.0 in the soils. The results showed that rock phosphate of the smallest grain size (<35 m) was superior to all of other grain sizes more than 35 m for reducing uptake in plant (Brassica oleracea L.) shoots for Cd (19.6-50.0%), Pb (21.9-51.4%) and Zn (22.4-34.6%), respectively, as compared with the soil without application of rock phosphate. Sequential extraction analysis indicated that rock phosphate was most effective for soil Pb to induced transformation from non-residual fractions to a residual fraction than that for Zn and Cd. Such transformation was probably through dissolution of Pb associated with exchangeable (EX), organic fraction (OC), acidic fraction (AC) and amorphous Fe and Al oxides-bound (OX) fraction and precipitation of pyromorphite-like minerals. Results suggested that the rock phosphate with small grain size was superior to that with large grain size for in situ remediation technology.

show abstract

Section: Introductionmentioning

confidence: 99%

The effect of grain size of rock phosphate amendment on metal immobilization in contaminated soils

Chen

Zhu

2006

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

“…This approach to reducing the mobility of metals consists of adding chemically-reactive mineral amendments to establish vegetation with metal-tolerant plant species (Berti and Cunningham, 2000). A large number of amendments have been tested, including lime (Li and Chaney, 1998;Hamon et al, 2002), Fe and Mn oxyhydroxides (Mench et al, 1994a;Mench et al, 1994b;Mench et al, 2000;Mench et al, 2003a), hydroxylapatite (Chlopecka and Adriano, 1996;Cotter-Howells and Caporn, 1996;Laperche et al, 1996;Greman et al, 2001;Seaman et al, 2001), alumino-silicates including zeolite (Chlopecka and Adriano, 1996;Knox et al, 2001) and beringite (Vangronsveld et al, 1995a;Vangronsveld et al, 1995b;Vangronsveld, 1998), and steel residues including Thomas basic slag (Mench et al, 1994a;Mench et al, 1994b) and steel shot (Sappin-Didier, 1995;Mench et al, 2003a). Beringite, steel shot, and hydroxylapatite are particularly efficient and lasting amendments, especially when used in combination (Boisson-Gruppen, 1999;Mench et al, 2003b).…”

Section: Introductionmentioning

confidence: 99%

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Panfili

Manceau

Sarret

et al. 2005

Geochimica et Cosmochimica Acta

122

129

View full text Add to dashboard Cite

Running Title: Effect of phytostabilzation on Zn speciation in dredged sediment 2 ABSTRACTThe maintenance of waterways generates large amounts of dredged sediments, which are deposited on adjacent land surfaces. These sediments are often rich in metal contaminants and present a risk to the local environment. Understanding how the metals are immobilized at the molecular level is critical for formulating effective metal containment strategies, such as phytoremediation. In the present work, the mineralogical transformations of Zn Seven Zn species were identified at the micrometer-scale : sphalerite, gahnite, franklinite, Zncontaining ferrihydrite and phosphate, (Zn-Al)-hydrotalcite, and Zn-substituted, kerolite-like, trioctahedral phyllosilicate. Bulk fractions of each species were quantified by LSF of the powder EXAFS spectra to linear combinations of the identified Zn species spectra.In the untreated and unvegetated sediment, Zn was distributed as ~50 % (mole ratio of total Zn) sphalerite, ~40 % Zn-ferrihydrite, and ~10-20 % (Zn-Al)-hydrotalcite plus Znphyllosilicate. In unvegetated but amended sediments (AP and TS), ZnS and Zn-ferrihydrite each decreased by 10 to 20 % and were replaced by Zn-phosphate (~30-40 %). In the presence of plants, ZnS was almost completely dissolved and the released Zn bound to phosphate (~40-60 %) and to Zn phyllosilicate plus (Zn,Al)-hydrotalcite (~20-40 %). Neither the plant species 3 nor the co-addition of mineral amendment affected the Zn speciation in the vegetated sediment.The sediment pore waters were supersaturated with respect to Zn-containing trioctahedral phyllosilicate, near-saturation with respect to Zn-phosphate, and strongly undersaturated with respect to (Zn,Al)-hydrotalcite. Therefore, the formation of (Zn,Al)-hydrotalcite in slightly alkaline conditions ought to result from heterogenous precipitation on mineral surface. 4

show abstract

“…Significant effort has been made to evaluate the effec tiveness of phosphate on in situ remediation of contam inated waters and soils (Basta et al, 2001;Cotter-Howells and Caporn, 1996;Hettiarachchi et al, 2000;Ma et al, 1995;Yang et al, 2001). Phosphate minerals, i.e.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of lead, copper, and zinc retention by phosphate rock

Cao

Lena

Rhue

et al. 2004

Environmental Pollution

325

View full text Add to dashboard Cite

''Capsule'': Phosphate-induced formation of fluoropyromorphite is primarily responsible for Pb immobilization by phosphate rock, whereas Cu and Zn retention is mainly attributable to the surface adsorption or complexation. AbstractThe solideliquid interface reaction between phosphate rock (PR) and metals (Pb, Cu, and Zn) was studied. Phosphate rock has the highest affinity for Pb, followed by Cu and Zn, with sorption capacities of 138, 114, and 83.2 mmol/kg PR, respectively. In the PbeCueZn ternary system, competitive metal sorption occurred with sorption capacity reduction of 15.2%, 48.3%, and 75.6% for Pb, Cu, and Zn, respectively compared to the mono-metal systems. A fractional factorial design showed the interfering effect in the order of Pb O Cu O Zn. Desorption of Cu and Zn was sensitive to pH change, increasing with pH decline, whereas Pb desorption was decreased with a strongly acidic TCLP extracting solution (pH ¼ 2:93). The greatest stability of Pb retention by PR can be attributed to the formation of insoluble fluoropyromorphite [Pb 10 (PO 4 ) 6 F 2 ], which was primarily responsible for Pb immobilization (up to 78.3%), with less contribution from the surface adsorption or complexation (21.7%), compared to 74.5% for Cu and 95.7% for Zn. Solution pH reduction during metal retention and flow calorimetry analysis both supported the hypothesis of retention of Pb, Cu, and Zn by surface adsorption or complexation. Flow calorimetry indicated that Pb and Cu adsorption onto PR was exothermic, while Zn sorption was endothermic. Our research demonstrated that PR can effectively remove Pb from solutions, even in the presence of other heavy metals (e.g. Cu, Zn).

show abstract

Remediation of contaminated land by formation of heavy metal phosphates

Cited by 245 publications

References 9 publications

The effect of grain size of rock phosphate amendment on metal immobilization in contaminated soils

The effect of grain size of rock phosphate amendment on metal immobilization in contaminated soils

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Mechanisms of lead, copper, and zinc retention by phosphate rock

Contact Info

Product

Resources

About