Electrokinetic-enhanced nanoscale iron reactive barrier of trichloroethylene solubilized by Triton X-100 from groundwater

Huang, Yi-Chu; Cheng, Ya‐Wen

doi:10.1016/j.electacta.2012.03.048

Cited by 21 publications

(10 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5(d). Similar results were observed in previous studies for TCE, 2,4-dichlorophenol, and PNCB degraded by NZVI [34], Pd/Fe [24], and CMC-stabilized Pd/Fe [27] nanoparticles, respectively. The variations of ORP and pH for the other tests listed in Table 1 were similar to those shown in Fig.…”

Section: Effect Of Phsupporting

confidence: 92%

Dechlorination of tetrachloroethylene in water using stabilized nanoscale iron and palladized iron particles

Chen

Huang

Lin

et al. 2013

Desalination and Water Treatment

Self Cite

View full text Add to dashboard Cite

A B S T R A C TChlorinated solvents such as tetrachloroethylene (PCE) in aquifers should be remediated due to their toxicity that limited the use of groundwater resources. Nanoscale zero-valent iron (NZVI) and palladized/iron (Pd/Fe) bimetallic particles were synthesized and employed to react with PCE in water to investigate its degradation behaviors. Batch tests were conducted in a 1 L serum bottle under airtight and anaerobic conditions with parameters of Pd mass contents, temperature, pH, and dispersant. The results showed that specific reaction rate constants (k SA ) of 5 mg L À1 PCE degraded by metal particles at 30˚C in the absence of dispersant enhanced with higher Pd mass contents on the Pd/Fe particles. Degradation rates of PCE increased as the reaction temperature was raised from 20 to 40˚C. Carboxymethyl cellulose (CMC), a dispersant, enhanced the k SA values of NZVI and 1:100 Pd/Fe particles by a factor of about 33 and 4 at 30˚C, respectively. The tests of pH control with buffer solution indicated that PCE degradation rates were promoted under acid and neutral conditions. Additionally, no chlorinated by-products were observed during the experimental period in each test. This study shows that effective dechlorination of PCE in water could be achieved by synthesized Pd/Fe and NZVI particles coupled with CMC dispersant.

show abstract

Section: Effect Of Phsupporting

confidence: 92%

Dechlorination of tetrachloroethylene in water using stabilized nanoscale iron and palladized iron particles

Chen

Huang

Lin

et al. 2013

Desalination and Water Treatment

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the combination of the EK and the PRB treatments is much more recent, and consequently, only a limited number of publications are available regarding this topic: some studies are based on using physical and/or chemical mechanisms in the PRB to remove metals or organic pollutants [21][22][23][24][25][26][27], while, to our knowledge, no references are available regarding the specific case of combined biological barriers/EK treatment. The combination of biotechnology and the EK phenomena for polluted soils remediation has been called "electrobioremediation" and has been previously studied as another strategy [2,[28][29][30][31][32][33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

et al. 2014

View full text Add to dashboard Cite

This paper studies the possibility of providing oxygen to a soil by an electrokinetic technique, so that the method could be used in future aerobic polluted soil bioremediation treatments. The oxygen was generated from the anodic reaction of water electrolysis and transported to the soil in a laboratory-scale electrokinetic cell. Two variables were tested: the soil texture and the voltage gradient. The technique was tested in two artificial soils (clay and sand) and later in a real silty soil, and three voltage gradients were used: 0.0 (control), 0.5, and 1.0 V cm(-1). It was observed that these two variables strongly influenced the results. Oxygen transport into the soil was only available in the silty and sandy soils by oxygen diffusion, obtaining high dissolved oxygen concentrations, between 4 and 9 mg L(-1), useful for possible aerobic biodegradation processes, while transport was not possible in fine-grained soils such as clay. Electro-osmotic flow did not contribute to the transport of oxygen, and an increase in voltage gradients produced higher oxygen transfer rates. However, only a minimum fraction of the electrolytically generated oxygen was efficiently used, and the maximum oxygen transport rate observed, approximately 1.4 mgO2 L(-1)d(-1), was rather low, so this technique could be only tested in slow in-situ biostimulation processes for organics removal from polluted soils.

show abstract

“…Among the nanoparticles, nano zero-valent iron (NZVI) undergoes a period of uncertainty and scrutiny in applications because of its high reactivity (Tang and Lo, 2013). The application of NZVI is a complementary treatment of iron permeable reactive barriers for groundwater remediation (Hosseini et al, 2011;Huang and Cheng, 2012;Saeedi et al, 2013;Scherer et al, 2000;Shariatmadari et al, 2009;Yan et al, 2013). Nano zero-valent iron could be 25 times more reactive than its counterpart (bulk zero-valent iron [ZVI]) because of its higher surface/volume ratio Nurmi et al, 2005) and faster delivery to deep contamination zones because of its smaller size (Vance, 2005).…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Nutrient Removal by Nano Zero‐Valent Iron under Different Biochemical Environments

Hu²

2015

Water Environment Research

View full text Add to dashboard Cite

The effectiveness of nano zero-valent iron (NZVI; an average size of 55 nm at a concentration of 200 mg Fe/L) in nutrient removal was determined under anaerobic, anoxic, and aerobic conditions. Compared to the rate of reduction of nitrate nitrogen (NO3--N) to ammoniacal nitrogen (NH4+-N) by NZVI alone, the presence of activated sludge increased the rate of complete reduction by 300%. About 31% of NO3--N was converted to NH4+-N through NZVI-facilitated dissimilatory nitrate reduction to ammonium, while 56% of NO3--N was removed by heterotrophic denitrification. The presence of sludge reduced the rates of phosphorus removal by NZVI, with the first-order reaction rate constants of 0.06/hour, 0.42/hour, and 0.18/hour under anaerobic, anoxic, and aerobic conditions, respectively. The highest phosphorus removal efficiency (95%) by NZVI was observed under anoxic abiotic conditions, whereas the efficiency dropped to 31% under anaerobic biotic conditions, which was attributed to significant sludge-facilitated NZVI agglomeration.

show abstract

Electrokinetic-enhanced nanoscale iron reactive barrier of trichloroethylene solubilized by Triton X-100 from groundwater

Cited by 21 publications

References 34 publications

Dechlorination of tetrachloroethylene in water using stabilized nanoscale iron and palladized iron particles

Dechlorination of tetrachloroethylene in water using stabilized nanoscale iron and palladized iron particles

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

Kinetics of Nutrient Removal by Nano Zero‐Valent Iron under Different Biochemical Environments

Contact Info

Product

Resources

About