Assessment of semi-dynamic leaching characteristics of lead and zinc from stabilized contaminated soil using sustainable phosphate-based binder after carbonation

Heavy metals in contaminated soils have benefited from a considerable attention due to the possible risks for the human body. The current study has investigated the accumulation and transfer coefficient for three heavy metals (Cu, Pb, Zn) found in the contaminated soil with three concentrations (c1=1.5%, c2=3.0%, c3=4.5%, c4=6.0%), obtained by mixing the three metals, in the tomato fruit. The highest accumulation in the tomato fruits was recorded for zinc, then copper and the smallest for lead, for all four concentrations used. The transfer coefficient decreases as the concentration of heavy metals increases, so that for high heavy metals concentrations, the values of the transfer coefficient are very low, and for small heavy metals concentrations in the soil, the values for the transfer coefficient are higher. The assessment of accumulation and transfer of heavy metals in the fruits of tomatoes grown in the contaminated soil has concluded that all concentrations of the copper, lead and zinc mix have shown a low risk for human consumption.

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Removal of Lead and Zinc From Contaminated Soil by a Novel Chelating Surfactant

CLEAN - Soil Air Water ◽

10.1002/clen.201500299 ◽

2016 ◽

Vol 44 (9) ◽

pp. 1191-1197 ◽

Cited By ~ 3

Author(s):

Hong-tao Qiao ◽

Bao-wei Zhao ◽

Jing-ru Diao ◽

Li-ping Huang ◽

Jin-kui Zhong ◽

...

Keyword(s):

Contaminated Soil ◽

Lead And Zinc

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Effects and optimization of initial pH and sewage sludge compost content on leaching of lead and zinc in contaminated soil

Korean Journal of Chemical Engineering ◽

10.1007/s11814-017-0234-7 ◽

2017 ◽

Vol 34 (12) ◽

pp. 3150-3155

Author(s):

Dong-Sik Eom ◽

Johng-Hwa Ahn

Keyword(s):

Sewage Sludge ◽

Contaminated Soil ◽

Sludge Compost ◽

Sewage Sludge Compost ◽

Lead And Zinc ◽

Initial Ph

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Bio-availability and Bio-accessibility of Lead and Zinc in Contaminated Soil from Cwymystwyth Lead Mine Site

Asian Soil Research Journal ◽

10.9734/asrj/2021/v5i430114 ◽

2021 ◽

pp. 10-18

Author(s):

Y. Abdullahi ◽

A. S. Aska ◽

C. Roberts ◽

M. S. Abdu ◽

J. Gambo

Keyword(s):

Contaminated Soil ◽

Inductively Coupled Plasma ◽

Scientific Evidence ◽

Research Area ◽

Soil Samples ◽

Wire Mesh ◽

Mine Site ◽

Bottom Soil ◽

Lead And Zinc ◽

Significant Difference

Cwmystwyth Lead Mine was an abundant mine site with pugh’s and kingside water drainages shows contaminated water in the research area with no much scientific evidence to ascertain the level of the pollution. Hence this research was designed to study level of lead and zinc in contaminated soil in which the bio-availability and bio-accessibility were measured. Sixteen (16) soil samples were taken at random using soil auger and a hand trowel. The samples were dried using an oven set at a constant temperature of 400oC for 72 hours. Wire mesh (250 microns) was used to sift the samples. The Unified (BARGE) method was used. The mimics mixtures of saliva, gastric, duodenal, and bile fluids. Three-stage mimic processes were performed, in the mouth, the stomach and intestinal cavities. All mimic digestive fluids were placed in the rotator water bath for 1hr at 37oC. The bioaccessibility of the soil Samples were analyzed by inductively coupled plasma-optical emission spectrophotometer (ICP-OES) method. The results were obtained using XRF and ICP methods. The percentage concentration of lead in the topsoil was 0.64% and in the bottom soil was 1.47%, with a total mean concentration of 1.06% in combined top and bottom soil. Zinc concentrations in the top and bottom soils were 0.22 and 0.45%, respectively, with a computed total mean of 0.34%. The findings revealed a highly significant difference between lead and zinc in both the top and bottom soil samples (LSD = P0.05). The average concentrations of lead and zinc extracted in both the stomach and intestinal stages were 15.98% and 1.23%, respectively

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Environmental Impacts and Immobilization Mechanisms of Cadmium, Lead and Zinc in Geotechnical Composites Made from Contaminated Soil and Paper-Ash

Applied Sciences ◽

10.3390/app112411822 ◽

2021 ◽

Vol 11 (24) ◽

pp. 11822

Author(s):

Marija Đurić ◽

Primož Oprčkal ◽

Vesna Zalar Serjun ◽

Alenka Mauko Pranjić ◽

Janez Ščančar ◽

...

Keyword(s):

Contaminated Soil ◽

Contaminated Soils ◽

Methodological Approach ◽

Extraction Procedure ◽

Water Soluble ◽

Mineral Phases ◽

Lead And Zinc ◽

Remediation Efficiency ◽

Cadmium Lead ◽

One Year

Paper-ash is used for remediation of heavily contaminated soils with metals, but remediation efficiency after longer periods has not been reported. To gain insights into the mechanisms of immobilization of cadmium (Cd), lead (Pb), and znic (Zn), a study was performed in the laboratory experiment in uncontaminated, artificially contaminated, and remediated soils, and these soils treated with sulfate, to mimic conditions in contaminated soil from zinc smelter site. Remediation was performed by mixing contaminated soil with paper-ash to immobilize Cd, Pb, and Zn in the geotechnical composite. Partitioning of Cd, Pb, and Zn was studied over one year in seven-time intervals applying the sequential extraction procedure and complementary X-ray diffraction analyses. This methodological approach enabled us to follow the redistribution of Cd, Pb, and Zn over time, thus, to studying immobilization mechanisms and assessing the remediation efficiency and stability of newly formed mineral phases. Cd, Pb, and Zn were effectively immobilized by precipitation of insoluble hydroxides after the addition of paper-ash and by the carbonization process in insoluble carbonate minerals. After remediation, Cd, Pb, and Zn concentrations in the water-soluble fraction were well below the limiting values for inertness: Cd by 100 times, Pb by 125 times, and Zn by 10 times. Sulfate treatment did not influence the remediation efficiency. Experimental data confirmed the high remediation efficiency and stability of insoluble Cd, Pb, and Zn mineral phases in geotechnical composites.

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Leaching characteristics and curing mechanism of magnesium phosphate cement solidified zinc-contaminated soil in an acid rain environment

Environmental Engineering Research ◽

10.4491/eer.2020.256 ◽

2020 ◽

Vol 26 (4) ◽

pp. 200256-0

Author(s):

Zhe Wang ◽

Hangjun Zhu ◽

Xuehui Wu ◽

Binpin Wei ◽

Hongli Zhou ◽

...

Keyword(s):

Heavy Metal ◽

Acid Rain ◽

Contaminated Soil ◽

Water Glass ◽

Ph Value ◽

Strong Acid ◽

Magnesium Phosphate ◽

Leaching Characteristics ◽

Curing Mechanism ◽

Acid Environment

A semi-dynamic leaching test was used to simulate the erosion effect of acid rain on magnesium phosphate cement (MPC)-stabilized/solidified zinc-contaminated soil. The leaching characteristics and curing mechanism were studied with a combination of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Influences of the initial pH value of the simulated acid rain, the ratio of the curing agent (MgO/KH2PO4, abbreviated M/P), and the mass of water glass on the leaching characteristics of Zn<sup>2+</sup> and conductivity in the leachate of the sample were studied. It is shown that the curing effect of the cement component on Zn<sup>2+</sup> is better for M/P = 6 when compared to M/P = 4 in a strong acid environment. While in a weak acid environment, it is observed that the curing effect is superior when M/P = 4. Also it is observed that 4% water glass content can effectively improve the cement curing effect of heavy metal Zn in an acid rain environment. These results indicate that water glass can be effectively applied to MPC solidified heavy metal Zn.

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