scholarly journals Iron electrolysis-assisted peroxymonosulfate chemical oxidation for the remediation of chlorophenol-contaminated groundwater

2015 ◽  
Vol 91 (4) ◽  
pp. 938-947 ◽  
Author(s):  
Nuo Yang ◽  
Jiaxin Cui ◽  
Lieyu Zhang ◽  
Wei Xiao ◽  
Akram N Alshawabkeh ◽  
...  
Keyword(s):  
Chemical Oxidation ◽  
Contaminated Groundwater ◽  
Iron Electrolysis

Application of in situ chemical oxidation to remediate sulfolane-contaminated groundwater: batch and pilot-scale studies

2021 ◽  
Vol 223 ◽  
pp. 136-145
Author(s):  
Zong-Han Yang ◽  
Ya-Lei Chen ◽  
Francis Verpoort ◽  
Cheng-Di Dong ◽  
Chiu-Wen Chen ◽  
...  
Keyword(s):  
Pilot Scale ◽  
Chemical Oxidation ◽  
Contaminated Groundwater ◽  
In Situ Chemical Oxidation

Development of KMnO4-releasing composites for in situ chemical oxidation of TCE-contaminated groundwater

2014 ◽  
Vol 54 ◽  
pp. 149-158 ◽  
Author(s):  
S.H. Liang ◽  
K.F. Chen ◽  
C.S. Wu ◽  
Y.H. Lin ◽  
C.M. Kao
Keyword(s):  
Chemical Oxidation ◽  
Contaminated Groundwater ◽  
In Situ Chemical Oxidation

Removal of Organic Micropollutants from Contaminated Groundwater by Oxidation and Stripping

1987 ◽  
Vol 22 (1) ◽  
pp. 187-196 ◽  
Author(s):  
L. Simovic ◽  
J.P. Jones
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hypochlorite ◽  
Chlorine Dioxide ◽  
Chemical Oxidation ◽  
Appropriate Technology ◽  
Contaminated Groundwater ◽  
Organic Micropollutants ◽  
Air Stripping ◽  
Groundwater Samples ◽  
Iron Sulphate

Abstract In 1984, Environment Canada carried out a bench scale study on the removal of organic micropollutants from contaminated groundwater. The groundwater samples were obtained from the Special Waste Compound at Gloucester Landfill Site, near Ottawa, Ontario. The objective of the study was to evaluate the effectiveness of chemical oxidation to destroy the organic micropollutants present in this groundwater. Comparison was made between the results of ozonation and the air stripping effects. The oxidants evaluated were ozone (O3), sodium hypochlorite (NaOCl), chlorine dioxide (ClO2) and hydrogen peroxide (H2O2) with hydrated iron sulphate FeSO4 7H2O (Fenton’s reagent). The organics present in the contaminated groundwater included the following, predominantly volatile, compounds: bromodichloro-methane, bromoform, 1,1,1-trichloroethane, chloroform, 1,1-dichloroethane, dichloromethane, 1,2-dichloroethane, 1,1-dichloroethylene, and trichloroethylene. The process variables investigated were pH and oxidant dosage. The significance of low and high values of these variables was examined by using a full 22 factorial design. From the results, it appeared that the best removal efficiency was achieved by using ozone as an oxidant. However, during the experiments, it was observed that the ozonation process was being confounded with the air stripping process. Chlorine dioxide and hydrogen peroxide, in that order, were determined to be less effective oxidants. Sodium hypochlorite was found to be the least effective oxidant in this study. The results of this study demonstrated that air stripping was the most appropriate technology for the removal of the organic compounds from this groundwater.

scholarly journals In Situ Chemical Oxidation of RDX-Contaminated Groundwater with Permanganate at the Nebraska Ordnance Plant

2010 ◽  
Vol 30 (3) ◽  
pp. 96-106 ◽  
Author(s):  
Jeffrey Albano ◽  
Steve D. Comfort ◽  
Vitaly Zlotnik ◽  
Todd Halihan ◽  
Mark Burbach ◽  
...  
Keyword(s):  
Chemical Oxidation ◽  
Contaminated Groundwater ◽  
In Situ Chemical Oxidation ◽  
Ordnance Plant

Activation of sodium percarbonate with ferrous ions for degradation of chlorobenzene in aqueous solution: mechanism, pathway and comparison with hydrogen peroxide

2017 ◽  
Vol 14 (8) ◽  
pp. 486 ◽  
Author(s):  
Sai Zhang ◽  
Xuebin Hu ◽  
Li Li ◽  
Xiaoliu Huangfu ◽  
Yingzhi Xu ◽  
...  
Keyword(s):  
Degradation Process ◽  
Degradation Pathway ◽  
Chemical Oxidation ◽  
Molar Concentration ◽  
Contaminated Groundwater ◽  
Ferrous Ions ◽  
Paramagnetic Resonance ◽  
In Situ Chemical Oxidation ◽  
Wide Range ◽  
Initial Ph

Environmental contextIt is practicable to remediate chlorobenzene-contaminated groundwater by in situ chemical oxidation. This study shows highly efficient degradation of chlorobenzene by an Fe-based process in a wide range of pH values. The technology is feasible for the removal of chlorobenzene from aqueous solutions and is appropriate for remediation of groundwater. AbstractSodium percarbonate (SPC) could be applied as a strong oxidant to degrade organic compounds activated by transition metals. In this study, the degradation performance of chlorobenzene (CB) in the Fe2+-catalysed SPC system was investigated at different Fe2+ and SPC concentrations and pH conditions. Fe2+/Fe3+ conversion was also studied, and the SPC system was compared with the H2O2 and H2O2/Na2CO3 systems. Free radicals were identified through scavenging tests and electron paramagnetic resonance (EPR) experiments, and the reaction intermediates and by-products were determined as well. The results show that CB was completely removed when the molar concentration ratio of Fe2+/SPC/CB was 8 : 8 : 1 and that the decomposition of CB increased as the initial Fe2+/SPC dosage increased. The optimal molar concentration of Fe2+/SPC/CB was 2 : 1 : 1, and the degradation rate was inhibited when increasing or decreasing Fe2+ or SPC. CB degradation was not significantly affected by variation of initial pH, and the variation of pH during the degradation process corresponded well with the degree of Fe2+ to Fe3+ conversion and the formation of •OH. It was confirmed that •OH, O2•− and 1O2 participate in the degradation process. Moreover, not all the •OH takes part in the degradation process, as some transforms into O2•− and 1O2. The same degradation efficiency was obtained when replacing SPC by equal stoichiometric amounts of H2O2, compared with inhibition with the addition of Na2CO3. Further, a likely degradation pathway for CB is proposed based on the identified products. These results show that the Fe2+/SPC system can form the basis of a promising technology for the remediation of CB-contaminated groundwater.

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