Ozone catalysed with solids as an advanced oxidation process for landfill leachate treatment

2007 ◽  
Vol 55 (12) ◽  
pp. 237-243 ◽  
Author(s):  
C. Tizaoui ◽  
L. Mansouri ◽  
L. Bousselmi
Keyword(s):  
Advanced Oxidation Process ◽  
Catalyst Concentration ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Catalytic Ozonation ◽  
Expanded Perlite ◽  
Landfill Leachates ◽  
Leachate Treatment ◽  
Gas Concentration ◽  
Heterogeneous Catalytic

Heterogeneous catalytic ozonation (HCO) of wastewater is gaining both research and industrial interests. It is proved to be an advanced oxidation process since it involves hydroxyl radicals as oxidation species. Few studies have been carried out to test HCO in the treatment of landfill leachates. This work has been carried out to test three types of catalysts: activated carbon (AC), expanded perlite (EP) and titanium dioxide (TiO2) combined with ozone at 80 g/m3 gas concentration for the treatment of a leachate generated by Jebel Chakir landfill site near Tunis–capital of Tunisia. The work has shown a reduction in COD of about 45% and an increase in biodegradability (BOD5/COD) from 0.1 to 0.34. A catalyst concentration of 0.7 g/L was found optimal for the treatment of the leachate.

scholarly journals Calcite Mineral Catalyst Capable of Enhancing Micropollutant Degradation during the Ozonation Process at pH7

2020 ◽  
Vol 2 (1) ◽  
pp. 26
Author(s):  
Savvina Psaltou ◽  
Efthimia Kaprara ◽  
Manassis Mitrakas ◽  
Anastasios Zouboulis
Keyword(s):  
Reaction Time ◽  
Hydroxyl Radicals ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Catalytic Ozonation ◽  
Batch Mode ◽  
Heterogeneous Catalytic ◽  
Physico Chemical ◽  
Oxidative Species ◽  
Ozonation Process

Catalytic ozonation is an Advanced Oxidation Process (AOPs) based on the production of hydroxyl radicals, which are very reactive oxidative species. The aim of this study is to evaluate the catalytic activity of calcite on the ozonation of four different typical micropollutants (atrazine, benzotriazole, carbamazepine, and p-CBA) at pH 7 and for low initial concentrations (4 μΜ) by performing batch mode experiments. These compounds have different physico-chemical characteristics, as well as different rate constants, when reacting with ozone and hydroxyl radicals (•OH), being in the range of <0.15 − 3 × 105 M−1s−1 and 2.4 − 8.8 × 109 M−1s−1, respectively. It was found that most of these micropollutants can be sufficiently removed by the application of heterogeneous catalytic ozonation, using calcite as the catalyst, except for the case of atrazine, which was the compound that was most difficult to degrade, when compared to the application of single ozonation. Carbamazepine with kO3 = 3 × 105 M−1s−1 can be easily removed even by single ozonation after the first minute of the reaction time, and the addition of the catalyst eliminated the oxidation/reaction time. The application of catalytic ozonation resulted in 50% and 68.2% higher removals of benzotriazole and p-CBA, respectively, in comparison with single ozonation, even during the first 3 min of the reaction/oxidation time, due to the higher production of hydroxyl radicals, caused by the catalytic ozonation. For the case of atrazine, the addition of calcite did not enhance the micropollutant degradation, and its removal reached 83% after a 30 min application of catalytic ozonation, whereas during the single ozonation, the removal under the same reaction time was 90%.

Advanced oxidation process–biological system for wastewater containing a recalcitrant pollutant

2007 ◽  
Vol 55 (12) ◽  
pp. 229-235 ◽  
Author(s):  
I. Oller ◽  
S. Malato ◽  
J.A. Sánchez-Pérez ◽  
M.I. Maldonado ◽  
W. Gernjak ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Catalyst Concentration ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Ozone Treatment ◽  
Saline Wastewater ◽  
Oxidation Processes ◽  
Oxidative Processes ◽  
Parabolic Collector

Two advanced oxidation processes (AOPs), ozonation and photo-Fenton, combined with a pilot aerobic biological reactor at field scale were employed for the treatment of industrial non-biodegradable saline wastewater (TOC around 200 mg L−1) containing a biorecalcitrant compound, α-methylphenylglycine (MPG), at a concentration of 500 mg L−1. Ozonation experiments were performed in a 50-L reactor with constant inlet ozone of 21.9 g m−3. Solar photo-Fenton tests were carried out in a 75-L pilot plant made up of four compound parabolic collector (CPC) units. The catalyst concentration employed in this system was 20 mg L−1 of Fe2 +  and the H2O2 concentration was kept in the range of 200–500 mg L−1. Complete degradation of MPG was attained after 1,020 min of ozone treatment, while only 195 min were required for photo-Fenton. Samples from different stages of both AOPs were taken for Zahn–Wellens biocompatibility tests. Biodegradability enhancement of the industrial saline wastewater was confirmed (&gt;70% biodegradability). Biodegradable compounds generated during the preliminary oxidative processes were biologically mineralised in a 170-L aerobic immobilised biomass reactor (IBR). The global efficiency of both AOP/biological combined systems was 90% removal of an initial TOC of over 500 mg L−1.

Dye house wastewater treatment through advanced oxidation process using Cu-exchanged Y zeolite: A heterogeneous catalytic approach

Chemosphere ◽  
2008 ◽  
Vol 70 (6) ◽  
pp. 1146-1151 ◽  
Author(s):  
Nishtar Nishad Fathima ◽  
Rathinam Aravindhan ◽  
Jonnalagadda Raghava Rao ◽  
Balachandran Unni Nair
Keyword(s):  
Wastewater Treatment ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Zeolite A ◽  
Y Zeolite ◽  
Heterogeneous Catalytic
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