The effect of ionic strength and hardness of trichloroethylene-contaminated synthetic groundwater on remediation using granular activated carbon

Heo, Joonghyeok; Lee, Dal-Heui; Koh, Dong‐Chan; Chang, Ho‐Wan

doi:10.1007/bf02913936

Cited by 11 publications

(9 citation statements)

References 31 publications

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“…IS and pH are the two main environmental factors discussed in this study. The IS of the suspension was controlled as 0, 15, 30 and 45 mM by adding sodium chloride (NaCl) in DI water, according to the IS range of groundwater [33]. The pH of the suspension was controlled as 5, 7 and 9 using 0.1 M sodium hydroxide (NaOH) solution and/or hydrochloric acid (HCl) solution in DI water to reflect acidic, neutral and alkaline conditions.…”

Section: Is and Ph Conditionsmentioning

confidence: 99%

Size Distribution and Phosphate Removal Capacity of Nano Zero-Valent Iron (nZVI): Influence of pH and Ionic Strength

Lin

et al. 2020

Water

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Nano zero-valent iron (nZVI) has been considered as a promising material for groundwater remediation in the past few decades. The size distribution of nZVI is one of the main factors that influences its transport capability and remediation capacity. However, studies on the size distribution of nZVI under different environmental conditions are still limited. In this study, the influence of the pH (pH = 5, 7, 9) and ionic strength (IS = 0, 15, 30, 45 mM) on the size distribution of nZVI are investigated. The dynamic light scattering (DLS) method is used to study the variation of the size distribution of nZVI aggregate with time, and batch tests are performed to evaluate the efficiency of phosphate removal. Meanwhile, the phosphate removal capacity of nZVI with different size distribution was examined. Experimental results show that under low IS and high pH conditions, nZVI aggregate exhibited a stable, narrow and one-peak size distribution. By contrast, under high IS and low pH conditions, nZVI exhibited a wide and complicated size distribution with multiple peak values. This different pattern in size distribution was further explained by the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The phosphate removal rate of nZVI under acidic and neutral conditions is higher than 98% but is only 68% under alkaline conditions. The phosphate removal capacity is insensitive to the variation of IS since the removal rate is higher than 97% for different IS conditions. Favorable environmental conditions for colloidal stability and removal capacity of nZVI can be different, which needs comprehensive consideration in the application.

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Section: Is and Ph Conditionsmentioning

confidence: 99%

Size Distribution and Phosphate Removal Capacity of Nano Zero-Valent Iron (nZVI): Influence of pH and Ionic Strength

Lin

et al. 2020

Water

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“…PCE는 국내에서 보고되는 염화물 성분 중 높은 비율을 차지하는 지하수의 오염 성분 중 한가지 이다 (Heo et al, 2007). PCE로 오 염된 지하수의 정화는, 효과적이고 친환경적인 반응물질 을 사용하여, 현장에 적절한 시공법을 사용한 투수성반응 벽체(PRBs, Permeable Reactive Barrier)를 이용하면 현 장에서 저렴한 비용으로 처리 가능하다 (Blowes et al, 1997;USEPA, 1995;USEPA, 1998;USEPA, 2001).…”

Section: 서 론unclassified

Remediation of PCE-contaminated Groundwater Using Permeable Reactive Barrier System with M0M-Bentonite

Chung¹,

Lee²

2012

Journal of Soil and Groundwater Environment

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The objectives of this research were to study the applicability and limitations of permeable reactive barrier (PRB) for the removal of tetrachloroethylene (PCE) from the groundwater. PRB column tests were conducted using reactive material with Moringa Oleifera Mass -Bentonite (Mom-Bentonite). Most of the PCE in the groundwater was degraded and/or captured (sorpted) in the zone containing activated material (MOM-Bentonite). The removal rate of PCE from the groundwater was 90% and 75% after 30 days and 180 days, respectively. The effect of micro-organisms on the long-term permeability and reactivity of the barrier is not well understood. MOM-Bentonite PRB system in this research has the potential to be developed into an environmentally and economically acceptable technology for the in situ remediation of PCE-contaminated groundwater.

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“…Increasing ionic strength reduces HOC solubility and consequently enhances the partitioning of HOCs to soils (Peng and Wan, 1998;Sennerfors et al, 2002;Tremblay et al, 2005;Heo et al, 2007;Sun et al, 2009;Behera et al, 2010). However, the effect of ionic strength on HOC desorption is unclear, as is that of the sorption-desorption hysteresis, and these are of great importance for elucidating the sorption-desorption processes of HOCs in soils.…”

Section: Introductionmentioning

confidence: 97%

Characteristics and influencing factors of tetrachloroethylene sorption–desorption on soil and its components

Qiu

Yang

et al. 2016

Chemosphere

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The effect of ionic strength and hardness of trichloroethylene-contaminated synthetic groundwater on remediation using granular activated carbon

Cited by 11 publications

References 31 publications

Size Distribution and Phosphate Removal Capacity of Nano Zero-Valent Iron (nZVI): Influence of pH and Ionic Strength

Size Distribution and Phosphate Removal Capacity of Nano Zero-Valent Iron (nZVI): Influence of pH and Ionic Strength

Remediation of PCE-contaminated Groundwater Using Permeable Reactive Barrier System with M0M-Bentonite

Characteristics and influencing factors of tetrachloroethylene sorption–desorption on soil and its components

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