Trichloroethylene Degradation by Zero Valent Iron Activated Persulfate Oxidation

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.

Download Full-text

Trichloroethylene Degradation by Various Forms of Iron Activated Persulfate Oxidation with or without the Assistance of Ascorbic Acid

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.5b04352 ◽

2016 ◽

Vol 55 (8) ◽

pp. 2302-2308 ◽

Cited By ~ 21

Author(s):

Ya-Ting Lin ◽

Chenju Liang ◽

Chun-Wei Yu

Keyword(s):

Ascorbic Acid ◽

Persulfate Oxidation ◽

Trichloroethylene Degradation ◽

Activated Persulfate ◽

Forms Of Iron

Download Full-text

Zero-valent iron-activated persulfate oxidation of a commercial alkyl phenol polyethoxylate

Environmental Technology ◽

10.1080/09593330.2015.1131751 ◽

2016 ◽

Vol 37 (14) ◽

pp. 1757-1767 ◽

Cited By ~ 11

Author(s):

Kubra Temiz ◽

Tugba Olmez-Hanci ◽

Idil Arslan-Alaton

Keyword(s):

Zero Valent Iron ◽

Alkyl Phenol ◽

Persulfate Oxidation ◽

Activated Persulfate

Download Full-text

Simultaneous removal of bisphenol A and phosphate in zero-valent iron activated persulfate oxidation process

Chemical Engineering Journal ◽

10.1016/j.cej.2016.06.016 ◽

2016 ◽

Vol 303 ◽

pp. 458-466 ◽

Cited By ~ 69

Author(s):

Li Zhao ◽

Yuefei Ji ◽

Deyang Kong ◽

Junhe Lu ◽

Quansuo Zhou ◽

...

Keyword(s):

Bisphenol A ◽

Oxidation Process ◽

Zero Valent Iron ◽

Simultaneous Removal ◽

Persulfate Oxidation ◽

Activated Persulfate

Download Full-text

Rapid Degradation of Nitrochlorobenzene by Activated Persulfate Oxidation With Biochar Supported Nanoscaled Zero Valent Iron

Frontiers in Chemistry ◽

10.3389/fchem.2021.615694 ◽

2021 ◽

Vol 9 ◽

Author(s):

Xiang Wang ◽

Rufeng Deng ◽

Wenbo Shen ◽

Jianbo Huang ◽

Qun Li ◽

...

Keyword(s):

Degradation Kinetics ◽

Oxidative Degradation ◽

Zero Valent Iron ◽

Superior Performance ◽

Peanut Shell ◽

Heterogeneous Oxidation ◽

Persulfate Oxidation ◽

Toxic Pollutant ◽

Kinetics Of ◽

Activated Persulfate

Although pesticide intermediates are a kind of typical toxic pollutant in contaminated sites, the remediation of these contaminants in groundwater and soils is of limited concern. In the present study we investigated the performance of a novel heterogeneous oxidation system, biochar supported nanoscaled-zero valent iron (nZVI/BC) activated persulfate (PS), in the oxidative degradation of nitrochlorobenzene (NCB), a typical pesticide intermediate. Peanut shell based nZVI/BC was prepared and used as the PS activator. The degradation kinetics of m-, p-, and o-NCB isomers in the aqueous phase were investigated. The effects of BC/nZVI composition (Fe/BC mass ratio), the amount of BC/nZVI and PS, and initial contaminant concentration on NCB removal were also examined. Results suggest that over 90% removals of three NCB isomers could be obtained by the nZVI/BC activated PS system at initial NCB concentration of 10 mg L−1. The combination of nZVI/BC composite and PS showed superior performance to PS alone. The optimal treatment condition was supposed as the Fe: BC ratio of 1:1, Fe amount of 6 mmol L−1, and the mole ratio of Fe to perfulfate of 1:1.

Download Full-text