Nickel removal by zero valent iron/lapillus mixtures in column systems

Madaffari, Maria Grazia; Bilardi, Stefania; Calabrò, Paolo S.; Moraci, Nicola

doi:10.1016/j.sandf.2017.08.006

Cited by 24 publications

(8 citation statements)

References 39 publications

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“…Regarding mixture reactive behaviour, when flow velocity decreases, RC grows due to an increase of the residence time as observed also in previous studies (Moraci et al, 2015). Moreover, at the end of the three tests significant variations of the hydraulic conductivity respect to the initial value are not highlighted (Madaffari et al, 2017).…”

Section: Effect Of Flow Velocitymentioning

confidence: 88%

“…The hydraulic conductivity of the 50:50 mixture reduces of about two orders of magnitude compared to the initial value, while the best hydraulic behaviour is observed for the 10:90 mixture, which should guarantee a slightly higher permeability over the long term than the 30:70 mixture. The reduction in hydraulic conductivity observed for the 50:50 mixture, is linked to the higher ZVI content per unit volume of the column, and consequently, to the higher quantity of corrosion products and gases (Madaffari et al, 2017).…”

Section: Zvi/lapillus Mixtures At Different Weight Ratiosmentioning

confidence: 91%

“…In this context, we proposed the use of volcanic materials, i.e. pumice and lapillus, as admixing agents to be coupled with ZVI (Moraci and Calabrò, 2010;Calabrò et al, 2012;Moraci et al, 2015;Madaffari et al, 2017;Bilardi et al, 2019). A comparison between the two different granular mixtures showed as ZVI/lapillus mixtures are more reactive than ZVI/pumice mixtures (Bilardi et al, in press).…”

Section: Introductionmentioning

confidence: 99%

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Optimal design of ZVI/lapillus mixtures for nickel removal in permeable reactive barriers

Bilardi

Calabrò

Moraci

2021

JGS Special Publication

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The remediation of contaminated groundwater, through the technology of permeable reactive barriers (PRB), involves the use of a reactive medium able to reduce the concentration of contaminants as long as remediation targets are achieved. In the present study, the use of granular mixtures composed of zero valent iron (ZVI) and lapillus for the treatment of nickel contaminated groundwater is proposed. Through short and long term column experiments, the effects of the following were analysed: i) ZVI percentage per unit volume, ii) reactive medium thickness, iii) flow velocity and iv) initial nickel concentration, on the breakthrough point occurrence (point where a rapid increase in nickel concentration in the effluent is observed). The optimal mixture composition (i.e. the optimal ZVI content per unit volume) was defined when the reactive medium was able to keep its reactivity and hydraulic conductivity for the time necessary for remediation. This capacity, as shown in this study, depends on the propagation velocity of the contamination front through the reactive medium.

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Section: Effect Of Flow Velocitymentioning

confidence: 88%

Section: Zvi/lapillus Mixtures At Different Weight Ratiosmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Optimal design of ZVI/lapillus mixtures for nickel removal in permeable reactive barriers

Bilardi

Calabrò

Moraci

2021

JGS Special Publication

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“…Los resultados obtenidos de la concentración de Níquel, Cromo hexavalente y Zinc en la corriente de lixiviados que emana del Relleno Sanitario clausurado de la Ciudad de Veracruz, si bien no sobrepasan los niveles máximos establecidos en la NOM-001- SEMARNAT-1996(DOF, 1997, representan una disminución de aproximadamente de 1.44 y 2.6 % para el Níquel y Cromo hexavalente respectivamente y un incremento del 1.6 % para el Zinc con respecto al año 2018 que reportaron 0.083,0.186 y 0.23 mg/l (Susunaga Miranda y Estévez Garrido, 2018), lo que significa que estos contaminantes continúan estando presentes en el canal de lixiviados el cual descarga al río Grande y desemboca en el Golfo de México representando aún un foco importante de aporte de metales pesados al Parque Nacional Sistema Arrecifal Veracruzano lo que representa un importante impacto ambiental (Botello et al, 2005). Pruebas realizadas en columnas para reducir la concentración de Níquel en ensayos experimentales utilizando 50 cm de columna durante tiempos de residencia cercana a 2500 segundo utilizando lapilli de piedras volcánicas de 2 a 62 mm presentó una eficiencia del 98 %, disminuyendo hasta 63 % en 100 h (Madaffari et al, 2017), por lo que se esperaría de acuerdo con la tendencia presentada en la gráfica 1 que al aumentar el espesor de la barrera, la eficiencia en la remoción se incremente y que esta se mantenga por mayor tiempo, ya que el proceso de adsorción que es el que sucede con el níquel por lo general por atracción electrostática de los metales por el relleno (Kumar et al, 2020).…”

Section: Discussionunclassified

Remoción de metales pesados (Cr+6, Ni, Zn) de lixiviados del Relleno Sanitario de la ciudad de Veracruz, México con barreras reactivas permeables de arena sílica

et al. 2021

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El uso de las Barreras reactivas permeables como material para la remoción de metales pesados de los lixiviados de los rellenos sanitarios ha sido comprobado para diversos materiales, la Arena sílica procedente de las costas del municipio de Alvarado Veracruz en México tienen las características de tamaño y composición requeridas para ser utilizadas para este fin, se colectaron muestras de Lixiviado procedente del Relleno Sanitario de la ciudad de Veracruz y se determinaron las concentraciones de Ni, Cr+6 y Zn fueron respectivamente 0.0818, 0.186 y 0.224 mg/l, se construyeron tres columnas de acrílico y se rellenaron con 20, 30 y 40 cm de Arena sílica lavada y seca, se hizo pasar lixiviado tratado y estabilizado por el medio poroso a una a un flujo de 1.7 ml/s, tomando muestras a los 40,75, 115, 165 y 235 segundos para cada columna y se midió la eficacia para la remoción estos metales pesados y se encontró una reducción significativa de estos contaminantes que va desde el de 76 a 93 % para el Níquel, de 44 al 81 % en el caso del Cromo hexavalente y desde 65 hasta el 92 % para el Zinc para un tiempo máximo de 235 segundos, lo que indica que este material puede ser utilizado en la remediación de lixiviados.

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“…[ 131 ] Nonetheless, this approach has not been fully adopted, and numerous admixing agents (zeolite, gravel, Fe 3 O 4 , pumice, lapillus) have been successively verified. [ 64,132–134 ] The results of Moraci and Calabrò demonstrated that the granular mixture of pumice and Fe maintained the long‐term hydraulic conductivity. [ 135 ] Simon et al.…”

Section: Recent Advances In Zvimentioning

confidence: 99%

Synthesis, Mechanism, and Performance Assessment of Zero‐Valent Iron for Metal‐Contaminated Water Remediation: A Review

Ullah

Faiz

Leng

2020

CLEAN Soil Air Water

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Recently, increased industrial and agriculture activities have resulted in toxic metal ions, which has increased public concern about the quality of surface and groundwater. Various types of physical, biological, and chemical approaches have been developed to remove surface and groundwater metal ions contaminants. Among these practices, zero‐valent iron (ZVI) is the most studied reactive material for environmental clean‐up over the last two decade and so. Although ZVI can remove the contaminants even more efficiently than any other reactive materials. However, low reactivity due to its intrinsic passive layer, narrow working pH, and the loss of hydraulic conductivity due to the precipitation of metal hydroxides and metal carbonates limits its wide‐scale application. The aim of this work is to document properties, synthesis, and reaction mechanism of ZVI for the treatment of metal ions from the surface and groundwater in recent 10 years (2008–2018). So far, different modified techniques such as conjugation with support, bimetal alloying, weak magnetic field, and ZVI/oxidant coupling system have been developed to facilitate the use of ZVI in various environmental remediation scenarios. However, some challenges still remain to be addressed. Therefore, development and research in this field are needed to overcome or mitigate these limitations.

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Nickel removal by zero valent iron/lapillus mixtures in column systems

Cited by 24 publications

References 39 publications

Optimal design of ZVI/lapillus mixtures for nickel removal in permeable reactive barriers

Optimal design of ZVI/lapillus mixtures for nickel removal in permeable reactive barriers

Remoción de metales pesados (Cr+6, Ni, Zn) de lixiviados del Relleno Sanitario de la ciudad de Veracruz, México con barreras reactivas permeables de arena sílica

Synthesis, Mechanism, and Performance Assessment of Zero‐Valent Iron for Metal‐Contaminated Water Remediation: A Review

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