Impact of Chloride Ions on UV/H2O2 and UV/Persulfate Advanced Oxidation Processes

2018 ◽  
Vol 52 (13) ◽  
pp. 7380-7389 ◽  
Author(s):  
Weiqiu Zhang ◽  
Shiqing Zhou ◽  
Julong Sun ◽  
Xiaoyang Meng ◽  
Jinming Luo ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Chloride Ions ◽  
Oxidation Processes

Combination of advanced oxidation processes and gas absorption for the treatment of chlorinated solvents in waste gases

2001 ◽  
Vol 44 (9) ◽  
pp. 173-180 ◽  
Author(s):  
J. Dewulf ◽  
H. Van Langenhove ◽  
E. De Smedt ◽  
S. Geuens
Keyword(s):  
Advanced Oxidation Processes ◽  
Bubble Column ◽  
Chlorinated Solvents ◽  
Advanced Oxidation ◽  
Chemical Oxidation ◽  
Chloride Ions ◽  
Gas Absorption ◽  
Oh Radicals ◽  
Chlorinated Organic Compounds ◽  
Oxidation Processes

Treatment of chlorinated organic compounds in waste gases is difficult because of several reasons: these compounds are dioxin precursors when incinerated, and also biological treatment is difficult because of a limited number of suitable microbial degradation pathways. On the other hand, since the 1990s, a new generation of chemical oxidation techniques has been introduced in water treatment. Advanced Oxidation Processes (AOPs) are based on a combination of UV/H2O2, UV/O3 or H2O2/O3. The combinations result in the generation of OH-radicals, which subsequently attack the organic pollutants. In this work, the treatment of a gas stream (240 L/h) loaded with 20-40 ppmv trichloroethylene (TCE) is presented. Therefore, a combination of an absorption process in a bubble column with a liquid H2O2/O3 initiated oxidation, was investigated. Removal efficiencies, depending on the dosed H2O2 and O3, up to 94% were found. The production of chloride ions was investigated: the Cl-atoms from the removed TCE could be found back as chloride ions. Next to the experimental work, attention was paid to the mechanisms taking place in the proposed concept. Here, a simulation model was developed, considering gas/liquid mass transfer of TCE and ozone, axial liquid dispersion, advective gas and liquid transport and about 29 chemical reaction steps. The modelling allowed a better understanding of the technique and gives insight in its possibilities and limitations. Finally, it can be concluded that the proposed technique shows interesting perspectives: it is able to transform chlorine in chlorinated solvents into chloride ions effectively at ambient temperature conditions.

Recent advances in single-atom catalysts for advanced oxidation processes in water purification

2021 ◽  
Vol 412 ◽  
pp. 125253
Author(s):  
Bingkun Huang ◽  
Zelin Wu ◽  
Hongyu Zhou ◽  
Jiayi Li ◽  
Chenying Zhou ◽  
...  
Keyword(s):  
Water Purification ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Single Atom ◽  
Oxidation Processes ◽  
Recent Advances
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