共 107 条
In-situ chemical oxidation: Principle and applications of peroxide and persulfate treatments in wastewater systems
被引:473
作者:
Devi, Parmila
[1
]
Das, Umashankar
[1
]
Dalai, Ajay K.
[1
]
机构:
[1] Univ Saskatchewan, Dept Chem & Biol Engn, Coll Engn, 57 Campus Dr, Saskatoon, SK S7N 5A9, Canada
基金:
加拿大自然科学与工程研究理事会;
关键词:
In-situ chemical oxidation;
Wastewater;
Persulfate;
Peroxide;
Degradation;
Activation;
ZERO-VALENT IRON;
ORGANIC CONTAMINANT DEGRADATION;
THERMALLY ACTIVATED PERSULFATE;
MAGNETIC BIOCHAR COMPOSITES;
PERSISTENT FREE-RADICALS;
ACID ORANGE 7;
HYDROGEN-PEROXIDE;
HYDROXYL RADICALS;
SULFATE RADICALS;
CHLORIDE-IONS;
D O I:
10.1016/j.scitotenv.2016.07.032
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Hydrogen peroxide (H2O2) and persulfate are the most efficient and commonly used oxidants in in-situ chemical oxidation (ISCO) of organic contaminants. This review focuses on the principle and activation techniques used in H2O2 and persulfate based ISCO processes. It is crucial to understand the effect of activation techniques on process chemistry and free radicals behaviour in order to achieve high degradation efficiency. The chemistry of interaction of activated H2O2 and persulfate with organic contaminants is complex and many parameters influence the performance of ISCO processes, namely non-productive reactants, reaction intermediates, oxygen and pH. The poor understanding of interaction behaviour and reaction chemistry of oxidants with organic contaminants prevents the utilization of full potential of the process. Therefore, particular attention has been given to the factors affecting degradation efficiency and the performance of ISCO processes. Further, the mechanism of contaminant degradation using activated H2O2 and persulfate significantly differ from each other. The interaction of SO4 center dot(-) radical usually involves electron transfer reactions whereas HO center dot radical involve electron-transfer and hydrogen atom abstraction reactions. Moreover, the research gaps have been identified based on the knowledge of current research and recommendations are made for further understanding of ISCO processes. (C) 2016 Published by Elsevier B.V.
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页码:643 / 657
页数:15
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