Intensification of the O3/H2O2 advanced oxidation process using a continuous tubular reactor filled with static mixers: Proof of concept

Abstract

An innovative implementation of the O 3 /H 2 O 2 advanced oxidation process was proposed to intensify the hydroxyl radical generation. Natural or drinking waters, containing atrazine as a probe compound, were spiked with H 2 O 2 and further continuously mixed to a pre-ozonated solution in a homogeneous tubular reactor filled with static mixers. Hydraulic residence times in the range 10 s-140 s were set at different sampling ports. The experimental results confirmed a very high ozone decomposition rate, concomitant with a high hydroxyl radical exposure (R ct in the range from 10-7 to 10-6), especially during the initial ozone decomposition phase (between 10 and 20 s). Equimolar initial concentrations of hydrogen peroxide and ozone were optimal to maximize the hydroxyl radical generation and to minimize their relative consumptions. The influence of the water matrix on the ozone decomposition and the hydroxyl radical generation was limited. This study is a proof of concept that using a homogeneous tubular reactor would be more effective than a gas-liquid reactor to apply the peroxone process.

Mini-Monoplant Technology for Pharmaceutical Manufacturing

“…For perfectly mixed reactions, one CSTR can be implemented for reactions with a specific network or a cascade of CSTRs to handle a wide range of reactions, kinetics, and phases. Some specific continuous and intensified examples (shown in Figure ) and applications of these (and related) reactor categories include plate microreactors, − oscillatory flow reactors, − coiled flow inverters, − micro packed bed reactors, , plug flow reactors with static mixer inserts, − mixed-suspension mixed-product-removal (MSMPR) crystallizers, , and miniaturized CSTRs . Thus, pharmaceutical processes may be intensified through these three targets: intensification of the synthesis route via more direct and higher-yield pathways; reactor technologies , often miniaturized, with high surface-to-volume ratios and reduced transport lengths that facilitate the use of the intensified reactions in target 1; increased productivity through continuous processing with a high degree of automation and RTRT. When all three targets are incorporated into the design of a pharmaceutical process, the result is a higher-yield, higher-productivity continuous process that can run relatively autonomously and with a smaller footprint than typical batch or semibatch processes.…”

Degradation mechanism of tris(2-chloroethyl) phosphate (TCEP) as an emerging contaminant in advanced oxidation processes: A DFT modelling approach

“…Scientific consensus is that the hydroxyl radical (OH•) is the common key feature of the above mentioned AOPs for TCEP degradation, due to the fact that OH• is one of the most oxidative radical, second only to the fluorine atom (Miklos et al 2018, Navalon et al 2010. This is also found in the decomposition of most organic compounds (Biard et al 2018, Ike et al 2019, Rusevova Crincoli and Huling 2020. The possible routes for OH• generation in various AOPs were summarized in Table 1.…”

Catalytic activity of using tungsten oxide with hydrogen peroxide for methyl orange degradation

“…These technologies have already shown their potential in treating toxic and biologically recalcitrant organic pollutants. The advanced oxidation processes include O 3 (Biard et al, 2018), UV (Seo et al, 2019), *Corresponding author. E-mail: aime.ello@univ-fhb.edu.ci.…”