Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS
MetadataShow full item record
© 2018 Elsevier Ltd In this study, we comparatively investigated the degradation of 12 trace organic chemicals (TOrCs) during UV/H2O2 and UV/peroxydisulfate (PDS) processes. Second-order rate constants for the reactions of iopromide, phenytoin, caffeine, benzotriazole, and primidone with sulfate radical (SO4•-) were determined for the first time. Experiments were conducted in buffered pure water and wastewater effluent with spiked TOrCs. UV/PDS degraded all TOrCs more efficiently than UV/H2O2 in buffered pure water due to the higher yield of SO4•- than that of hydroxyl radical (•OH) at the same initial molar dose of PDS and H2O2, respectively. UV/PDS showed higher selectivity toward TOrCs removal than UV/H2O2 in wastewater effluent. Compounds with electron-rich moieties, such as diclofenac, venlafaxine, and metoprolol, were eliminated faster in UV/PDS whereas UV/H2O2 was more efficient in degrading compounds with lower reactivity to SO4•-. The fluence-based rate constants (kobs-UV/H2O2) of TOrCs in wastewater effluent linearly increased as a function of initial H2O2 dose during UV/H2O2, possibly due to the constant scavenging impact of the wastewater matrix on •OH. However, exponential increase of kobs-UV/PDS with increasing PDS dose was observed for most compounds during UV/PDS, suggesting the decreasing scavenging effect of the water matrix (electron-rich site of effluent organic matter (EfOM)) after initial depletion of SO4•- at low PDS dose. Fulvic and humic-like fluorophores appeared to be more persistent during UV/H2O2 compared to aromatic protein and soluble microbial product-like fluorophores. In contrast, UV/PDS efficiently degraded all identified fluorophores and showed less selectivity toward the fluorescent EfOM components. Removal pattern of TOrCs during pilot-scale UV/PDS was consistent with lab-scale experiments, however, overall removal rates were lower due to the presence of higher concentration of EfOM and nitrite.
Showing items related by title, author, creator and subject.
Investigation of pre-treatment used for organic foulant removal from wastewater effluent on fouling of membranes used for wastewater treatment and reuseAryal, Ashok (2009)The volume of global water is very large. However, the source of water on the globe is finite and also distributed in quite uneven manner. In addition to this, freshwater source is dwindling and becoming scarce from human ...
Sequential solid entrapment and in situ electrolytic alkaline hydrolysis facilitated reagent-free bioelectrochemical treatment of particulate-rich municipal wastewaterKhalfbadam, H.; Ginige, M.; Sarukkalige, Priyantha Ranjan; Kayaalp, A.; Cheng, K. (2017)© 2017 Elsevier LtdWe introduce here a novel process for the treatment of particulate-rich wastewater. A two-stage combined treatment process, consisting of an electrolysis filter and a bioelectrochemical system (BES) ...
Linge, Kathryn ; Liew, Deborah; Gruchlik, Yolanta ; Busetti, Francesco ; Ryan, Una; Joll, Cynthia (2021)While nutrient removal has been well studied in waste stabilisation ponds (WSPs), studies of organic micropollutant removal in pond systems are limited. In this study, we investigated organic micropollutant, nitrogen and ...