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Several Advanced Oxidation Processes (AOPs) including O3/H2O2, O3/TiO2, O3/activated carbon (AC), O3/Al2O3, O3/Fe 2+ /H2O2 and UV/TiO2 have been investigated and compared for the removal of diethyl phthalate (DEP), an endocrine disrupting compound, in aqueous solutions. Hydroxyl radicals were the main species responsible for DEP degradation and this was supported by computational chemistry calculation, scavenger experiments, and LC/MS/MS analysis. The change of the abundance of reaction products over time was determined. Organic acids as well as anhydride and hydroxylated products were found to accumulate in solution even after long reaction time (2h). Careful choice of the operating parameters (pH, ozone concentration and catalyst dosage) was crucial to achieve enhanced performance of the combined processes above what each oxidant and catalyst can achieve alone. O3/AC process was found to reduce the oxidation efficiency of O3 at high ozone concentrations. Heterogeneous catalytic ozonation with Al2O3 was the most effective process for DEP removal (~100% removal in about 15 min) and based on pseudo-first-order kinetics at pH7, the studied oxidation processes followed the order: O3/Al2O3(0.093min-1)>O3/H2O2/Fe 2+ (0.076min-1)>O3/AC(0.069min-1)>O3/H2O2(0.053min-1)>O3/TiO2(0.050min-1)> O3 alone (0.039min-1)>UV/TiO2(0.009min-1).

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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.

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ForewordThis topical collection of Environmental Science and Pollution Journal (ESPR) is dedicated to the third international conference on Advanced Oxidation Process for Sustainable Water Management (3rd AOP-Tunisia). It was held in Hammamet city, Tunisia, from 2nd to 4th of November 2017 and chaired by Prof. Latifa Bousselmi form the Centre for Water Research and Technologies (CERTE, www.certe. rnrt.tn). The main aim of this conference was to offer exchange opportunities between scientists, scholars, and socioeconomic actors operating in the domains of wastewaters treatment by advanced oxidation process and sustainable water resources management. It was also an excellent occasion to discuss on the latest research outputs regarding the cited above topics, to create new connections, to build new relationships, and to design future cooperation.The 3rd AOP Tunisia conference was an international event, which was organized in terms of invited lecturers' contributions as well as refereed oral and poster presentations. An exhibition space gave the opportunity to companies to present their products and services. The conference was designed to cover four specific topic areas with seven identified Keynote speakers invited to address key issues in each topic area. The topic areas covered were (i) advanced oxidation process, (ii) materials and engineering in AOP field, (iii) case study of AOP: implementation in industrial or urban context, and (iv) sustainable water management (approaches and tools, treatment, combination with AOP for water recycling).This conference has attracted 109 abstracts from 11 different countries, covering three continents: Africa, Asia, and Europe. All these abstracts have undergone a formal peer-reviewed procedure in order to select the ones having excellent/good technical quality and to assign each one of them to the most adapted session. From these, only 87 abstracts were selected by the international scientific committee. There were 2 plenary communications, 7 keynotes, 33 full oral presentations, and 45 poster presentations. The total number of participants was 120 attendees. They came mainly from Tunisia (56%), Jordan (12%), Germany (11%), and Algeria (11%). The remaining 10% of participants were from France, Palestine, South Africa, Syria, Morocco, Sudan, and Nigeria.After a meticulous peer-review process, nine (9) high scientific-level papers have been accepted for publication. They mainly concern wastewater treatment by photocatalysis, photo-Fenton, and adsorption technologies.The first paper is entitled "Basic red 2 and methyl violet adsorption by date pits: adsorbent characterization, optimization by RSM and CCD, equilibrium and kinetic studies" (Wakkel et al. 2018). In this work the raw date pits as a low-cost agricultural waste has been studied in order to adsorb two cationic dyes (Basic red 2 (BR2) and methyl violet (MV)) from aqueous solutions. The authors used response surface methodology (RSM) for the optimization of the adsorption parameters (contact time, temperature, initial ...