Benefits of ozonation before activated carbon adsorption for the removal of organic micropollutants from wastewater effluents

Abstract

OMPs adsorption increased after ozonation at high specific ozone doses only • Ozonation performances were impacted by the presence of TSS • Low specific ozone doses allowed the removal of OMPs refractory to adsorption • Non-reactive OMPs toward ozone were well adsorbed onto PAC • The best combination was 0.20-0.30 gO3/gDOC and 10 mg/L PAC

Photocatalytic ozonation in an immersion rotary body reactor for the removal of micro-pollutants from the effluent of wastewater treatment plants

“…Based on this problem, methods of advanced wastewater treatment (4th treatment stage) were developed. Adsorptive processes using powdered or granulated activated carbon and oxidative processes using ozone have been implemented on an industrial scale in many projects (Bourgin et al 2018;Guillossou et al 2019;Guillossou et al 2020). Advanced oxidation processes (AOPs), which enable the oxidation of wastewater constituents by reactants such as hydroxyl radicals, superoxides, ozonides and electrode defects at ambient temperatures, are currently not used in wastewater treatment outside of research projects (Kanakaraju et al 2018).…”

Urban pathways of biocides towards surface waters during dry and wet weathers: Assessment at the Paris conurbation scale

“…were not removed at all and median removals were negative (from -77% to -17%). Such increases in concentration were previously observed [22,44,51]. Therefore, two assumptions were made.…”

“…Negative removals were observed for diuron, terbutryn, thiabendazole, and tebuconazole, which is worth investigating in further studies. Advanced treatment in WWTP could be an effective solution to mitigate the release of these contaminants into the aquatic environment from WWTP effluents [44]. However, it is expensive and has no effect on stormwater discharges from separate sewer systems or CSOs.…”

Reversible and irreversible membrane fouling in hollow-fiber UF membranes filtering surface water: effects of ozone/powdered activated carbon treatment

“…10 Combined ozone and PAC technology might better enhance the removals of contaminants and alleviate UF fouling. 11,12 Researchers used combined ozone and PAC treatment to remove biocides, antimycotics, and antibiotics in a sewage treatment plant and found that conventional treatment with added full-scale ozonation was able to remove most of the studied micropollutants, except for benzotriazoles and uconazole (<50%). 13 Nevertheless, as the membrane fouling induced by NOM in natural waters was not composed of a certain specic membrane foulant or single membrane fouling mechanism but instead of multiple membrane foulants that work together, while during the operation process, the changes of organic substances might lead to dynamic changes of membrane fouling, whereas both ozone and PAC treatment might inuence the membrane fouling separately and simultaneously, which might result in more complicated membrane fouling behavior, despite some efforts have been made to investigate the membrane fouling mechanism by ozone and PAC treatment, 11 the dynamic changes of reversible and irreversible resistance remain need to be clearly elucidated, which might provide more accurate information for large-scale UF application as well as membrane fouling control in actual engineering.…”