Remediation of Heavy Metal Contamination in Calcareous Soil by Washing with Reagents: A Column Washing

Yang, Zhihui; Zhang, Shujuan; Liao, Yingping; Li, Qian; Wu, Baoin; Wu, Ruiing

doi:10.1016/j.proenv.2012.10.106

Cited by 27 publications

(13 citation statements)

References 26 publications

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“…Saponin (Maity et al 2013), EDTA , Na 2 EDTA (Pociecha and Lestan 2010a;Qiu et al 2010;Yang et al 2012), ADDC (Golan et al 2014), surface active agents (Torres et al 2012), hydrochloric acid (Moon et al 2012), various organic acids and alkalis (Kim et al 2013;Li et al 2015), and low-molecularweight organic acids (LMWOAs) (Wang and Mulligan 2013) had been reported to be effective on remediating Pb and Zn pollution. However, the removal rate of either Pb or Zn, with the highest being 47 % for Pb and 18 % for Zn, was not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Wang

Jiang

et al. 2015

Environ Sci Pollut Res

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Pb and Zn contamination in agricultural soils has become an important issue for human health and the environment. Washing is an effective method for remediating polluted soil. Here, we compare several washing materials and methods in the treatment of Pb- and Zn-polluted farmland soil. We examined four washing reagents, hydrochloric acid, citric acid, Na2EDTA, and tartaric acid, all of which independently removed Zn at rates >65 %. Combining washing reagents markedly enhanced heavy metal removal, by using Na2EDTA and either tartaric acid or lactate in sequence: Pb and Zn removal rates improved to 84.1 and 82.1 % for Na2EDTA-tartaric acid; and to 88.3 and 89.9 % for Na2EDTA-lactate, respectively. Additionally, combining ultrasound with conventional washing methods markedly improved washing efficiency, by shortening washing duration by 96 %. We achieved similar removal rates using ultrasound for 10 min, compared with traditional mechanical vibration alone for 4 h. We concluded that treating Pb- and Zn-contaminated soil with appropriate washing reagents under optimal conditions can greatly enhance the remediation of polluted farmland soils.

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Section: Introductionmentioning

confidence: 99%

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Wang

Jiang

et al. 2015

Environ Sci Pollut Res

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“…Kulikowska et al (2015) found that the efficiency of Cu, Ni and Zn removal with a solution of humic substances from sewage sludge compost decreased as soil age increased, while the efficiency of Pb and Cd removal did not depend on soil aging. When testing synthetic washing agents, some authors found that a combination of acid and chelator could remove HMs with higher efficiency than any single acid or chelator (Yang et al 2012). Thus, soil washing with combinations of biosurfactants that have different affinities for specific HMs could be important, especially for treatment of multi-HM-contaminated soils.…”

Section: Introductionmentioning

confidence: 99%

Sequential soil washing with mixed biosurfactants is suitable for simultaneous removal of multi-metals from soils with different properties, pollution levels and ages

2019

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In this study, plant (SAP, TAN) and microbial (RAM) biosurfactants were applied to two soils, in single or sequential soil washing. Soil 1 was moderately acidic, with higher content of organic matter and HMs (Cd, Cu, Ni, Pb and Zn), and was aged for 24 months. Soil 2 was alkaline, with lower content of organic matter and HMs, and was aged for 1 month. The stability of the HMs (as I R), except for Pb, was higher in soil 1 than in soil 2, but the rankings of HM stability were similar: Cu > Ni ≈ Pb > Zn > Cd (soil 1) and Cu > Pb > Ni > Zn > Cd (soil 2). The HMs were removed more efficiently from soil 2 than from soil 1, mainly from the readily available fraction and partially from the reducible fraction. Cu (0.3-0.5 times), Ni (0.4-1.1 times) and Zn (0.5-1.0 times) showed the largest increases in stability after soil washing with SAP. With a single washing, SAP and TAN were the least effective for Pb removal (18-31% and 11-35%, respectively), while RAM was the most effective for Cd (69-73%) and Pb (58-63%) removal. Sequential soil washing, especially with SAP followed by RAM, was the best choice for simultaneous removal of multi-HMs.

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“…Soils polluted with heavy metals can be decontaminated through a variety of methods of remediation, such as stabilization, solidification, electroremediation and phytoremediation 4 . Among the techniques of remediation, the simplicity of chemical soil washing, its low cost, short duration and high efficiency, makes it a practical option for metal removal 5 – 7 .…”

Section: Introductionmentioning

confidence: 99%

Central Composite Design Optimization of Zinc Removal from Contaminated Soil, Using Citric Acid as Biodegradable Chelant

Asadzadeh

Maleki-Kaklar

Soiltanalinejad

et al. 2018

Sci Rep

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Citric acid (CA) was evaluated in terms of its efficiency as a biodegradable chelating agent, in removing zinc (Zn) from heavily contaminated soil, using a soil washing process. To determine preliminary ranges of variables in the washing process, single factor experiments were carried out with different CA concentrations, pH levels and washing times. Optimization of batch washing conditions followed using a response surface methodology (RSM) based central composite design (CCD) approach. CCD predicted values and experimental results showed strong agreement, with an R2 value of 0.966. Maximum removal of 92.8% occurred with a CA concentration of 167.6 mM, pH of 4.43, and washing time of 30 min as optimal variable values. A leaching column experiment followed, to examine the efficiency of the optimum conditions established by the CCD model. A comparison of two soil washing techniques indicated that the removal efficiency rate of the column experiment (85.8%) closely matching that of the batch experiment (92.8%). The methodology supporting the research experimentation for optimizing Zn removal may be useful in the design of protocols for practical engineering soil decontamination applications

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Remediation of Heavy Metal Contamination in Calcareous Soil by Washing with Reagents: A Column Washing

Cited by 27 publications

References 26 publications

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Sequential soil washing with mixed biosurfactants is suitable for simultaneous removal of multi-metals from soils with different properties, pollution levels and ages

Central Composite Design Optimization of Zinc Removal from Contaminated Soil, Using Citric Acid as Biodegradable Chelant

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