Persulfate oxidation for the aniline degradation in aqueous systems

2011 ◽  
Vol 63 (7) ◽  
pp. 1434-1440 ◽  
Author(s):  
Jin Anotai ◽  
Nalinrut Masomboon ◽  
Chung-Lin Chuang ◽  
Ming-Chun Lu
Keyword(s):  
Ferrous Ion ◽  
Molar Ratio ◽  
Aqueous Systems ◽  
Optimum Ratio ◽  
Ferrous Ions ◽  
Persulfate Oxidation ◽  
Molar Ratios ◽  
Thermally Activated ◽  
Oxidation Experiment ◽  
Activated Persulfate

Ferrous catalyzed persulfate oxidation of dissolved aniline was investigated in aqueous systems under a variety of ferrous ion concentrations and temperature. Result showed that the addition of ferrous ions accelerated the degradation of aniline by persulfate. For the thermally activated persulfate oxidation experiment, the optimum persulfate/aniline concentration ratio at 30˚C was at 5.4 mM or 20/1. This ratio gave the highest aniline removal of 45%. For the ferrous ion catalyzed persulfate oxidation experiment, there was marginal difference in the result for the various ferrous ion/oxidant molar ratios. Thus, another series of experiment was conducted to determine the optimum ratio and a ferrous ion/persulfate molar ratio of 1.25/1 showed the highest removal efficiency.

Thermally activated persulfate oxidation of NAPL chlorinated organic compounds: effect of soil composition on oxidant demand in different soil-persulfate systems

2017 ◽  
Vol 75 (8) ◽  
pp. 1794-1803 ◽  
Author(s):  
Jialu Liu ◽  
Zhehua Liu ◽  
Fengjun Zhang ◽  
Xiaosi Su ◽  
Cong Lyu
Keyword(s):  
Organic Compounds ◽  
Mineral Content ◽  
Removal Rate ◽  
Soil Types ◽  
Soil Composition ◽  
Persulfate Oxidation ◽  
Chlorinated Volatile Organic Compounds ◽  
Thermally Activated ◽  
Soil Components ◽  
Activated Persulfate

This study investigates the interaction of persulfate with soil components and chlorinated volatile organic compounds (CVOCs), using thermally activated persulfate oxidation in three soil types: high sand content; high clay content; and paddy field soil. The effect of soil composition on the available oxidant demand and CVOC removal rate was evaluated. Results suggest that the treatment efficiency of CVOCs in soil can be ranked as follows: cis-1,2-dichloroethene > trichloroethylene > 1,2-dichloroethane > 1,1,1-trichloroethane. The reactions of soil components with persulfate, shown by the reduction in soil phase natural organics and mineral content, occurred in parallel with persulfate oxidation of CVOCs. Natural oxidant demand from the reaction of soil components with persulfate exerted a large relative contribution to the total oxidant demand. The main influencing factor in oxidant demand in paddy-soil-persulfate systems was natural organics, rather than mineral content as seen with sand and clay soil types exposed to the persulfate system. The competition between CVOCs and soil components for oxidation by persulfate indicates that soil composition exhibits a considerable influence on the available oxidant demand and CVOC removal efficiency. Therefore, soil composition of natural organics and mineral content is a critical factor in estimating the oxidation efficiency of in-situ remediation systems.

Oxidative Degradation and Kinetics of Trichloroethylene by Thermally Activated Persulfate

2014 ◽  
Vol 675-677 ◽  
pp. 547-550
Author(s):  
Jun Jie Yue ◽  
Xiao Qiao Zhu ◽  
Yu Ting Wang ◽  
Yu Qin Zhang ◽  
Li Zhao ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Chemical Oxidation ◽  
Molar Ratio ◽  
Pseudo First Order Reaction ◽  
In Situ Chemical Oxidation ◽  
First Order ◽  
Molar Ratios ◽  
Thermally Activated ◽  
Kinetics Of

In situ chemical oxidation with persulfate (PS) anion (S2O82-) is a viable technique for remediation of groundwater contaminants such as trichloroethylene (TCE). This laboratory study investigated the use of the oxidant sodium PS for the chemical oxidation of TCE at different conditions to determine the influence of temperature, pH, and the PS/TCE molar ratio. Experiments revealed that higher temperatures, lower pH, and higher PS/TCE molar ratios were to the benefit of TCE oxidation by PS. By investigating the reaction kinetics, the degradations of contaminant can be described by use of pseudo-first-order reaction. At the temperatures ranging from 25°C to 40°C, the activation energy for the degradation of TCE was determined to be 85.04 KJ/mol.

Naproxen abatement by thermally activated persulfate in aqueous systems

2015 ◽  
Vol 279 ◽  
pp. 861-873 ◽  
Author(s):  
Antoine Ghauch ◽  
Al Muthanna Tuqan ◽  
Nadine Kibbi
Keyword(s):  
Aqueous Systems ◽  
Thermally Activated ◽  
Activated Persulfate

Ultrasound assisted, thermally activated persulfate oxidation of coal tar DNAPLs

2016 ◽  
Vol 318 ◽  
pp. 497-506 ◽  
Author(s):  
Libin Peng ◽  
Li Wang ◽  
Xingting Hu ◽  
Peihui Wu ◽  
Xueqing Wang ◽  
...  
Keyword(s):  
Coal Tar ◽  
Persulfate Oxidation ◽  
Thermally Activated ◽  
Ultrasound Assisted ◽  
Activated Persulfate

Enhanced dewaterability of sewage sludge with zero-valent iron-activated persulfate oxidation system

2015 ◽  
Vol 72 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Lingling Hu ◽  
Yu Liao ◽  
Chun He ◽  
Wenqi Pan ◽  
Shangkun Liu ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Ph Value ◽  
Three Dimensional ◽  
Bound Water ◽  
Zero Valent Iron ◽  
Molar Ratio ◽  
Persulfate Oxidation ◽  
Potential Benefits ◽  
Sludge Dewaterability ◽  
Activated Persulfate

The potential benefits of zero-valent iron-activated persulfate (Na2S2O8) oxidation in enhanced dewaterability of sludge, along with the associated mechanisms were investigated in this study. The sludge dewaterability was evaluated in terms of specific resistance to filtration (SRF) and water content. Based on these indexes, it was observed that ZVI-S2O82 oxidation effectively improved sludge dewaterability. The optimal conditions to give preferable dewaterability were found when the molar ratio of ZVI/S2O82− was 5:1 and pH value was 3.0. The most important mechanism was proposed to be the degradation of extracellular polymeric substances (EPS) incorporated in sludge flocs and rupture of microbial cells. Three-dimensional excitation–emission matrix fluorescence spectra revealed that the powerful SO4− and ·OH generated from ZVI-S2O82− system destroyed the particular functional groups of fluorescing substances (aromatic protein-like and tryptophan protein-like substances), resulting in the release of bound water and the subsequent enhancement of dewaterability. Therefore, ZVI/S2O82− oxidation is an alternative approach showing great potential to be applied in sludge treatment plants.

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