Scrutiny of interference effect of ions and organic matters on water treatment using supported nanoscale zero-valent iron

Khalil, Ahmed M.E.; Eljamal, Osama; Amen, Tareq W.M.; Sugihara, Yuji; Matsunaga, Nobuhiro

doi:10.1007/s12665-018-7661-6

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…They have proven that the existence of calcium, magnesium and carbonate ions in groundwater have vast impact on the ZVI by development of inactive deposits, such as CaCO 3 and Mg(OH) 2 , on the ZVI surface resulting in a decreased durability of the ZVI by preventing electron conduction (Lo et al 2006). This result is in agreement with those reported by other works (Khalil et al 2018). Similarly, the other study has investigated the dechlorination of TCE under different quality of groundwater and anaerobic environments.…”

Section: Effect Of Hardness In the Durability Of Prb Systemsupporting

confidence: 93%

“…This provides further backing to the earlier supposition that one of the problems associated with ZVI particles is the enhancement of reactivity of these particles with reduction of selectivity of pollutant removal from water that caused ZVI reaction with non-target materials (disturbing ions) and consequently caused to reduce e ciency of target pollutant removal in water (Elliott and Zhang 2001). To elucidate this decline in target pollutant removal, it was described that the active sites of nZVI surface have a positive charge state originally; thus, a contest between various negatively charged anions such as nitrate, phosphate and sulfate ions involves with in overlaying these surface active sites, resulting in a drop in removal e ciency (Khalil et al 2018).…”

Section: Effect Of Nitrate In the Durability Of Prb Systemmentioning

confidence: 99%

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WITHDRAWN: Removal of MTBE From Groundwater Using A PRB of ZVI/Sand Mixtures: Role of Nitrate And Hardness

Ghayurdoost

Assadi

Mehrasbi

2021

Preprint

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In this study, the efficiency of the permeable reactive barrier (PRB) in a column reactor using zero-valent iron (ZVI) particles and sand mixture in the removal of methyl tert-butyl ether (MTBE) from aquatic phases was investigated. The main operating parameters influence reactor performance such as pH, reaction time, pollutant content, catalyst load, hydraulic loading rate, and the reaction rate constant was evaluated. The results showed that the efficiency of process decreased with increasing pH, inflow, and pollutant concentration. In this case, the optimal conditions were obtained at pH=7, flow rate=0.23 m3/m2.d and C0=1 mg/L, which achieved a remarkable removal efficiency up to 90.32%. The being of high nitrate and hardness concentrations as intervening factors were led to reduce process efficiency to less than 44.61% and 51.4%, respectively. Lack of interfering factors had a considerable effect on the reaction rate of MTBE reduction that is approximately 2.65 and 4.11 times higher than in the presence of calcium hardness and nitrate, respectively. The PRB can be operated to remediate groundwater containing hydrocarbons based on filling media and hydraulic conditions.

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Section: Effect Of Hardness In the Durability Of Prb Systemsupporting

confidence: 93%

Section: Effect Of Nitrate In the Durability Of Prb Systemmentioning

confidence: 99%

WITHDRAWN: Removal of MTBE From Groundwater Using A PRB of ZVI/Sand Mixtures: Role of Nitrate And Hardness

Ghayurdoost

Assadi

Mehrasbi

2021

Preprint

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“…The results of column studies on the filtration of DW, SGW, and WW bodies spiked with multiple ECs, each at 1 mg/L, using PG are shown in Figure 8 . The presence of competing ions and organic matters in contaminated water have mixed effects on adsorption in real sample investigations based on the nature of interfering matter, adsorbent and water body type, and adsorption mechanism [ 42 ]. From our column studies, it was found that there was no negative interference with several ECs removal from two water bodies, DW and SGW.…”

Section: Resultsmentioning

confidence: 99%

Performance Evaluation of Porous Graphene as Filter Media for the Removal of Pharmaceutical/Emerging Contaminants from Water and Wastewater

et al. 2021

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Graphene and its counterparts have been widely used for the removal of contaminants from (waste)water but with limited success for the removal of pharmaceutical contaminants. Driven by this need, this study reports, for the first time, the removal of pharmaceuticals from real contaminated water samples using porous graphene (PG) as a filter-based column. This work systematically evaluates the performance of PG as a filter medium for the removal of widely consumed pharmaceutical/emerging contaminants (ECs) such as atenolol, carbamazepine, ciprofloxacin, diclofenac, gemfibrozil and ibuprofen. Several factors were investigated in these column studies, including different reactive layer configurations, bed packing heights (5–45 mm), filter sizes (inner diameter 18–40 mm), adsorbent dosages (100–500 mg-PG) and water bodies (distilled water, greywater, and actual effluent wastewater). Sustainable synthesis of PG was carried out followed by its use as a filter medium for the removal of pharmaceuticals at high concentrations (10.5 ± 0.5 mg/L) and trace concentrations (1 mg/L). These findings revealed that the double-layered PG-sand column outperformed a PG single-layered configuration for the removal of most of the ECs. The removal efficiency of ECs from their solutions was improved by increasing PG dosages and filter bed height and size. Although the treatment of mixed pharmaceutical solutions from different water bodies was affected by the negative interference caused by competing water compounds, the treatment of ECs-contaminated greywater was not severely affected. Our findings suggest that PG, as a highly efficient filter medium, could be used for the removal of emerging pharmaceutical contaminants from water and wastewater.

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“…Finally, the effects of the presence of organic matter in wastewater were examined by adding urea (CH 4 N 2 O) and sodium acetate (C 2 H 3 NaO 2 ) with concentrations of 100 and 50 mg/L, respectively. These concentrations were chosen to simulate the maximum interference conditions that can be present in real-world wastewater (Almeelbi & Bezbaruah 2014;Khalil et al 2018).…”

Section: Batch Experiments For Interference Studiesmentioning

confidence: 99%

Adsorption of phosphorus onto nanoscale zero-valent iron/activated carbon: removal mechanisms, thermodynamics, and interferences

Adly

Mostafa

Elawwad

2022

Journal of Water Reuse and Desalination

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This study investigated removal mechanisms, thermodynamics, and interferences of phosphorus adsorption onto nanoscale zero-valent iron (nZVI)/activated carbon composite. Activated carbon was successfully used as support for nZVI particles to overcome shortcomings of using nZVI include its tendency to aggregate and separation difficulties. A comprehensive characterization was done for the composite particles, which revealed a high specific surface area of 72.66 m2/g and an average particle size of 37 nm. Several adsorption isotherms and kinetic models have been applied to understand the removal mechanisms. Adsorption isotherm is best fitted by Freundlich and Langmuir models, which indicates that the estimated maximum phosphorus adsorption capacity is 53.76 mg/g at pH 4. Adsorption kinetics showed that the chemisorption process behaved according to a pseudo-second-order model. An adsorption mechanism study conducted using the intra-particle diffusion and Boyd kinetic models indicated that the adsorption rate is limited by surface diffusion. A thermodynamic study showed that phosphorus removal efficiency increased as the solution temperature increased from 15 to 37 °C. Finally, the results of an interference study showed that the presence of Ni2+, Cu2+, Ca2+, Na+ cations, nitrate ions (), and sodium acetate improves removal efficiency, while the presence of sulfate ions () and urea reduces removal efficiency.

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Scrutiny of interference effect of ions and organic matters on water treatment using supported nanoscale zero-valent iron

Cited by 14 publications

References 34 publications

WITHDRAWN: Removal of MTBE From Groundwater Using A PRB of ZVI/Sand Mixtures: Role of Nitrate And Hardness

WITHDRAWN: Removal of MTBE From Groundwater Using A PRB of ZVI/Sand Mixtures: Role of Nitrate And Hardness

Performance Evaluation of Porous Graphene as Filter Media for the Removal of Pharmaceutical/Emerging Contaminants from Water and Wastewater

Adsorption of phosphorus onto nanoscale zero-valent iron/activated carbon: removal mechanisms, thermodynamics, and interferences

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