VUV/UV oxidation performance for the elimination of recalcitrant aldehydes in water and its variation along the light-path

Ouyang, Wan-Yue; Wang, Wenlong; Zhang, Yilin; Cai, Hanying; Wu, Qian-Yuan

doi:10.1016/j.watres.2022.119390

Cited by 22 publications

(2 citation statements)

References 43 publications

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“…The H 2 O homolysis by VUV is the main • OH origin for VUV/UV, but the VUV photon irradiance decayed by around 90% within 0.6 cm of L p in water. Our previous research indicated that the oxidation within the water L p < 1.0 cm contributed more than 90% of the • OH oxidation capacity . Thus, when the L p increased from 1.0 to 3.0 cm, the k obs dramatically decreased due to the low • OH oxidation capacity in the water layers of L p > 1.0 cm, which can be evidenced by the proportional decrease of k obs with E p,VUV ave (Figure S8).…”

Section: Results and Discussionmentioning

confidence: 99%

Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H₂O₂

Wang,

Jing,

Zhang

et al. 2024

Environ. Sci. Technol.

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Low-pressure mercury lamps with high-purity quartz can emit both vacuum-UV (VUV, 185 nm) and UV (254 nm) and are commercially available and promising for eliminating recalcitrant organic pollutants. The feasibility of VUV/UV as a chemical-free oxidation process was verified and quantitatively assessed by the concept of H 2 O 2 equivalence (EQ Hd 2 Od 2 ), at which UV/H 2 O 2 showed the same performance as VUV/UV for the degradation of trace organic contaminants (TOrCs). Although VUV showed superior H 2 O activation and oxidation performance, its performance highly varied as a function of light path length (L p ) in water, while that of UV/H 2 O 2 proportionally decreased with decreasing H 2 O 2 dose regardless of L p . On increasing L p from 1.0 to 3.0 cm, the EQ Hd 2 Od 2 of VUV/UV decreased from 0.81 to 0.22 mM H 2 O 2 . Chloride and nitrate hardly influenced UV/H 2 O 2 , but they dramatically inhibited VUV/UV. The competitive absorbance of VUV by chloride and nitrate was verified as the main reason. The inhibitory effect was partially compensated by • OH formation from the propagation reactions of chloride or nitrate VUV photolysis, which was verified by kinetic modeling in Kintecus. In water with an L p of 2.0 cm, the EQ Hd 2 Od 2 of VUV/UV decreased from 0.43 to 0.17 mM (60.8% decrease) on increasing the chloride concentration from 0 to 15 mM and to 0.20 mM (53.5% decrease) at 4 mM nitrate. The results of this study provide a comprehensive understanding of VUV/UV oxidation in comparison to UV/H 2 O 2 , which underscores the suitability and efficiency of chemical-free oxidation with VUV/UV.

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Section: Results and Discussionmentioning

confidence: 99%

Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H₂O₂

Wang,

Jing,

Zhang

et al. 2024

Environ. Sci. Technol.

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“…Understanding how microorganisms survive under oligotrophic conditions also helps to comprehend the biodegradation mechanisms of 'emerging organic carbon', which have received much attention in recent years. 'Emerging organic carbon' refers to anthropogenic compounds that enter the environment at low concentrations but exerts profound ecological effects toward, or are toxic to, both aquatic life and human health 17,18 . Micropollutants, a subset of emerging organic carbon, encompass a broad range of chemical compounds released from industrial, agricultural, and urban activities 19,20 .…”

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Microbial strategies driving low concentration substrate degradation for sustainable remediation solutions

Yin,

He,

Collins

et al. 2024

npj Clean Water

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Microbial metabolism upholds a fundamental role in the sustainability of water ecosystems. However, how microorganisms surviving in low-concentration substrate water environments, including the existence of emerging compounds of interest, remains unclear. In this review, microbial strategies for concentrating, utilizing, and metabolizing of low concentration substrates were summarized. Microorganisms develop substrate-concentrating strategies at both the cell and aggregate levels in substrate-limited settings. Following, microbial uptake and transport of low-concentration substrates are facilitated by adjusting physiological characteristics and shifting substrate affinities. Finally, metabolic pathways, such as mixed-substrate utilization, syntrophic metabolism, dynamic response to nutrient variation, and population density-based mechanisms allow microorganisms to efficiently utilize low-concentration substrates and to adapt to challenging oligotrophic environments. All these microbial strategies will underpin devising new approaches to tackle environmental challenges and drive the sustainability of water ecosystems, particularly in managing low-concentration contaminants (i.e., micropollutants).

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Synergistic effect in enhancing treatment of micro-pollutants by ferrate and carbon materials: A review

Dai,

Liu,

et al. 2024

Chinese Chemical Letters

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VUV/UV oxidation performance for the elimination of recalcitrant aldehydes in water and its variation along the light-path

Cited by 22 publications

References 43 publications

Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H₂O₂

Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H₂O₂

Microbial strategies driving low concentration substrate degradation for sustainable remediation solutions

Synergistic effect in enhancing treatment of micro-pollutants by ferrate and carbon materials: A review

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VUV/UV oxidation performance for the elimination of recalcitrant aldehydes in water and its variation along the light-path

Cited by 22 publications

References 43 publications

Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H2O2

Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H2O2

Microbial strategies driving low concentration substrate degradation for sustainable remediation solutions

Synergistic effect in enhancing treatment of micro-pollutants by ferrate and carbon materials: A review

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Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H₂O₂

Assessing the Chemical-Free Oxidation of Trace Organic Chemicals by VUV/UV as an Alternative to Conventional UV/H₂O₂