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

Moghal, Arif Ali Baig; Reddy, Krishna R.; Mohammed, Syed Abu Sayeed; Al‐Shamrani, Mosleh; Zahid, Waleed M.

doi:10.21660/2017.29.5155

Cited by 6 publications

(6 citation statements)

References 37 publications

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“…Further, a non-dimensional leachability index (LI) was calculated based on caged TCLP tests and was found to vary between 2 and 4 for virgin soils, and for soils amended with nano calcium silicate (NCS), it varied between 5 and 6. As per USEPA, a leachability index (LI) of more than 6 is considered as better material to arrest the transport of contaminants, and in our study, the leachability index (LI) for amended soils varies between 5 and 6; this confirms that the material is attenuating or retaining heavy metals, but there needs to be a small increase in the percentage of NCS added to soil which shall increase the value of LI to more than 6 as per USEPA standards [16,19,23,24,27].…”

Section: Results and Discussion Leaching Studiessupporting

confidence: 64%

Efficacy of nano calcium silicate (NCS) treatment on tropical soils in encapsulating heavy metal ions: leaching studies validation

Mohammed¹,

Moghal

2016

Innov. Infrastruct. Solut.

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Soils are known to retain heavy metals through a number of processes. In this study, four different leaching methods viz. ASTM D3987, toxicity characteristics leaching procedure (TCLP), extended TCLP, and caged TCLP have been used to study the leaching behavior of Cd 2? , Ni 2? and Pb 2? on red and black cotton soils. Further, these soils were amended with nano calcium silicate (NCS). Also, sequential extraction was performed on these soil mixtures to know the extent of sorption taking place in different phases of soils such as exchangeable, oxidizing, reducing, organic content and residual phases. It was found that as per ASTM D3987, all three heavy metals with red soil and black cotton soil were retained well in the short term, and over a long-term period, the metal ion was released back. When amended with NCS, both red soil and black cotton soil exhibited satisfactory retention levels over long periods which proved that NCS was responsible for encapsulation of metal ions in its matrix. To investigate the retention efficiency, extensive leaching tests were performed, and it was found that as per TCLP, extended TCLP and caged TCLP tests, the retention with NCS-amended red earth soil was 88, 90 and 94 % compared to untreated case. Sequential extraction proved that encapsulation was durable in NCS-amended soils compared to untreated ones.Hence, it is concluded that NCS-amended soil is a prospective material to attenuate heavy metals taking into consideration their long-term encapsulation effect in considered soils. This soil NCS mixture is expected to be a potent agent for in situ treatment of brown fields and an excellent substitute for existing conventional landfill liner materials.

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Section: Results and Discussion Leaching Studiessupporting

confidence: 64%

Efficacy of nano calcium silicate (NCS) treatment on tropical soils in encapsulating heavy metal ions: leaching studies validation

Mohammed¹,

Moghal

2016

Innov. Infrastruct. Solut.

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“…However, a comprehensively understanding of the maintenance process of dissolved matters will require that various factors such as sorption, ion exchange, and diffusion are taken into account [7], [8], [9].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

PRESENCE STATE OF TRACE ELEMENTS IN THE OHTAKIGAWA RIVER WATERSHED FROM THE FOOT OF Mt. ONTAKE

Usami

Nobori

Yagi

et al. 2018

GEOMATE

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This paper is aimed at understanding the influence of Mt. Ontake volcanic activity on the water quality of the Ohtakigawa River watershed. For this purpose, various properties of trace elements are obtained. The Ohtakigawa, which flows along the southern foot of Mt. Ontake, has several tributaries such as Nigorigawa River, Shirakawa River, Shimokurosawa River, and Uguigawa River. Seven sampling stations were selected in the four tributaries (four points) and the Ohtakigawa (three points). Filtration of samples was carried out with teflon filter paper (PTFE, 0.5μm, φ 47mm), and the samples were separated into dissolved and suspended matters. Trace elements contained in them were analyzed by using the ICPE. The concentrations of the trace elements were high in the following order: the Nigorigawa (Al: 6.16mg L -1 ), the Ohtakigawa after the confluence of the Nigorigawa (Al: 1.92mg L -1 and 0.88mg L -1 ), and the others (Al: 0.06-0.70mg L -1 ). This result indicates that among the four tributaries, the Nigorigawa plays a predominant role in the change in the water quality of the Ohtakigawa.

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“…Sorption parameters can be taken from the literature, laboratory column experiments, or field studies. Several researchers reviewed and compiled the sorption parameters for arsenic for various sorbent materials (Kanel et al 2006;Moghal et al 2017). The partition coefficient value of 0.50 l/kg is adopted for the numerical simulation (Moghal et al 2017).…”

Section: Arsenic Sorptionmentioning

confidence: 99%

Modelling heavy metals contamination in groundwater of Southern Punjab, Pakistan

Ashraf

Chen

Ramamurthy

2020

Int. J. Environ. Sci. Technol.

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The present study aimed to develop a numerical simulation to predict the chemistry change of groundwater heavy metals pollution (mainly arsenic pollution) in the Southern region of the Punjab province of Pakistan. This work is the first attempt in modelling the transport of groundwater heavy metals pollution in the area using a 1D reactive transport model. PHREEQC was employed to perform the numerical simulation. The conceptual model represented the 1D numerical transport model with the homogenous mineral composition having uniform transport of the municipal wastewater. A 100 m column -20 cell transport model was used with a time step of 5,000 years; making a simulated timescale of 100,000 years. The simulation was carried out using quartz, illite, and calcite kinetics. Arsenic sorption kinetics were also incorporated in the simulation. The results revealed that the concentrations of four out of ten heavy metals and three out of eight inorganic ions were above the drinking water quality standards at the end of the simulation making the groundwater unsafe for drinking purposes. The arsenic concentration was found out to be 3.79 mg/l against 100,000 year which is 379 times the international drinking water standard and about 76 times the national drinking water standard for arsenic. It is concluded that the groundwater, regardless of the natural soil treatment, will be highly contaminated after 100,000 years particularly with heavy metals including arsenic, cadmium, iron, lead, and nickel. The groundwater quality can be enhanced by appreciating the preventive measures recommended in this study. KeywordsArsenic • Geochemistry • Contamination • Groundwater • Modelling * Orange highlighted correlation is significant at the 0.05 level (2-tailed). ** Red highlighted correlation is significant at the 0.01 level (2-tailed).

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

Cited by 6 publications

References 37 publications

Efficacy of nano calcium silicate (NCS) treatment on tropical soils in encapsulating heavy metal ions: leaching studies validation

Efficacy of nano calcium silicate (NCS) treatment on tropical soils in encapsulating heavy metal ions: leaching studies validation

PRESENCE STATE OF TRACE ELEMENTS IN THE OHTAKIGAWA RIVER WATERSHED FROM THE FOOT OF Mt. ONTAKE

Modelling heavy metals contamination in groundwater of Southern Punjab, Pakistan

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