Soils Amended with Admixtures as Stabilizing Agent to Retain Heavy Metals

Mohammed, Syed Abu Sayeed; Moghal, Arif Ali Baig

doi:10.1061/9780784413272.216

Cited by 9 publications

(5 citation statements)

References 2 publications

(1 reference statement)

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“…Calcium has been found to retain arsenic by replacing itself for arsenic in a ratio of 1: 1 mole [8]. However, a sufficient amount of Ca(OH) 2 is also required for the hydration to proceed in the system [9][10][11]. Reference [12] studied, lime stabilization of the fly ash and found it was not completely effective.…”

Section: Introductionmentioning

confidence: 99%

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Moghal

Reddy²,

Mohammed³

et al. 2017

geomate

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ABSTRACT:In this study, locally available semi-arid soils (Al-Ghat and Al-Qatif) having different chemical and mineralogical characteristics are considered as barrier materials, and their response to arsenic adsorption at varying initial concentrations, pH conditions, temperature and dilution ratios is studied. Empirical models (Langmuir and Freundlich) are applied to ascertain monolayer or heterogeneous adsorption. Lime is added to these soils in order to enhance their geotechnical properties. Kinetic models are employed to validate the type and nature of arsenic sorption onto these soils (whether pseudo first-order or second-order). Also Elovich and intraparticle diffusion models revealed that along with surface adsorption, chemisorptions and diffusion are the other processes occurring concurrently in the system, but it was not able to identify the dominant phenomenon among these models. It was concluded that both Al-Ghat and Al-Qatif soils when amended with lime can attenuate arsenic, and the experimental results correlate well with selected empirical models.

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Section: Introductionmentioning

confidence: 99%

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Moghal

Reddy²,

Mohammed³

et al. 2017

geomate

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“…Three heavy metals, namely cadmium (Cd), nickel (Ni), and lead (Pb), were spiked in the soils by preparing a stock solution with predetermined load ratios to obtain the target concentrations of contaminants in the soil as described by Mohammed and Moghal [2].…”

Section: Heavy Metal Contaminantsmentioning

confidence: 99%

“…Increase in population and attempts to satisfy the ever-growing demands of the same have led to industrialization, widespread construction activity, and extensive mining. Industrial effluents contaminate land and thereby pose a threat to the environment [1,2]. The number of contaminated sites identified in the United States of America alone until 2004 was 294,000 [3], which indicates an alarming need to implement remediation and decontamination methods to maintain a balance in nature.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Enzymatically Induced Calcium Carbonate Precipitation in the Retention of Heavy Metal Ions

Moghal

Lateef²,

Mohammed³

et al. 2020

Sustainability

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This study evaluated the efficacy of enzyme induced calcite precipitation (EICP) in restricting the mobility of heavy metals in soils. EICP is an environmentally friendly method that has wide ranging applications in the sustainable development of civil infrastructure. The study examined the desorption of three heavy metals from treated and untreated soils using ethylene diamine tetra-acetic acid (EDTA) and citric acid (C6H8O7) extractants under harsh conditions. Two natural soils spiked with cadmium (Cd), nickel (Ni), and lead (Pb) were studied in this research. The soils were treated with three types of enzyme solutions (ESs) to achieve EICP. A combination of urea of one molarity (M), 0.67 M calcium chloride, and urease enzyme (3 g/L) was mixed in deionized (DI) water to prepare enzyme solution 1 (ES1); non-fat milk powder (4 g/L) was added to ES1 to prepare enzyme solution 2 (ES2); and 0.37 M urea, 0.25 M calcium chloride, 0.85 g/L urease enzyme, and 4 g/L non-fat milk powder were mixed in DI water to prepare enzyme solution 3 (ES3). Ni, Cd, and Pb were added with load ratios of 50 and 100 mg/kg to both untreated and treated soils to study the effect of EICP on desorption rates of the heavy metals from soil. Desorption studies were performed after a curing period of 40 days. The curing period started after the soil samples were spiked with heavy metals. Soils treated with ESs were spiked with heavy metals after a curing period of 21 days and then further cured for 40 days. The amount of CaCO3 precipitated in the soil by the ESs was quantified using a gravimetric acid digestion test, which related the desorption of heavy metals to the amount of precipitated CaCO3. The order of desorption was as follows: Cd > Ni > Pb. It was observed that the average maximum removal efficiency of the untreated soil samples (irrespective of the load ratio and contaminants) was approximately 48% when extracted by EDTA and 46% when extracted by citric acid. The soil samples treated with ES2 exhibited average maximum removal efficiencies of 19% and 10% when extracted by EDTA and citric acid, respectively. It was observed that ES2 precipitated a maximum amount of calcium carbonate (CaCO3) when compared to ES1 and ES3 and retained the maximum amount of heavy metals in the soil by forming a CaCO3 shield on the heavy metals, thus decreasing their mobility. An approximate improvement of 30% in the retention of heavy metal ions was observed in soils treated with ESs when compared to untreated soil samples. Therefore, the study suggests that ESs can be an effective alternative in the remediation of soils contaminated with heavy metal ions.

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“…It quantifies the predominance between sorption and diffusion. Even after having a refined literature on sorption there remains a major challenge to understand sorption onto heterogeneous materials such as soils, which are the major component on the earth's crust [15,16].…”

Section: Mechanistic Response For Strontium Removal In Soilsmentioning

confidence: 99%

State-of-the-Art Review on Strontium Toxicokinetics, Mechanistic Response, Alterations and Regulations

Moghal¹

2019

GEOMATE

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Strontium is mostly present in oil, coal, soil and rocks in the form of isotopes of four types 84 Sr, 86 Sr, 87 Sr and 88 Sr. It resembles the chemical form of calcium and even replaces the position in bones and other places where calcium finds its importance in the human or animal body. Strontium, if exchanged with calcium in greater quantity, can cause serious effects like cancer in bone and its neighbouring tissues and necrotic lesions. However, the effect is negligible when the exchange is lesser. If present in the geo-environment, strontium compounds in both forms stable or radioactive percolates in the groundwater, but a majority of this compound present in soil remains undisturbed for a considerable amount of time. The permissible amount of strontium which can be acceptable in water according to the US Environmental Protection Agency (USEPA) is 4 mg L 1 . Further presence of strontium up to 240 mg kg 1 in soil is considered as less toxic to grownups not suffering from malnutrition. Anthropogenic and natural activities leading to the release of strontium in the atmosphere pose a chance of transportation and deposition by the wet deposition method. The natural treatment of strontium by biodegradation or hydrolysis does not decay atoms of strontium due to its form. This paper deals with the chemical and physical properties and toxico-kinetics of strontium. Moreover, few points pertaining to health of flora and fauna when it is in direct contact with strontium and the safety concerns with relevant regulations are discussed.

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Soils Amended with Admixtures as Stabilizing Agent to Retain Heavy Metals

Cited by 9 publications

References 2 publications

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Efficacy of Enzymatically Induced Calcium Carbonate Precipitation in the Retention of Heavy Metal Ions

State-of-the-Art Review on Strontium Toxicokinetics, Mechanistic Response, Alterations and Regulations

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