Formation of aldehydes and carboxylic acids in ozonated surface water and wastewater: A clear relationship with fluorescence changes

Liu, Chen; Tang, Xiangyu; Kim, Jaeshin; Korshin, Gregory V.

doi:10.1016/j.chemosphere.2014.12.054

Cited by 55 publications

(47 citation statements)

References 45 publications

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“…For instance, Win et al 2000found that the biodegradability of DOM was not appreciably affected by ozonation until a threshold of ozone dose was reached. Liu et al (2015) reported that there was no significant formation of aldehydes and carboxylic acids that comprise a large part of the assimilable organic carbon (AOC) in ozonated wastewater (DOC 7.8 mg/L) with O 3 dose less than 2 mg/L. The plateau in BDOC rapid formation at higher O 3 /DOC ratios is also consistent with prior observations (Siddiqui et al 1997, Treguer et al 2010.…”

Section: Degradation Of Fluorophoressupporting

confidence: 86%

“…Ozonation has been shown to convert relatively refractory components of dissolved organic matter (DOM) into BDOC (e.g., aldehydes, carboxylic acids, ketones and etc.) without a significant decrease in overall dissolved organic carbon (DOC) concentration (Liu et al 2015, Nishijima et al 2003, Wert et al 2007. The ozonation-derived BDOC in turn largely defines the biological stability of ozonated water, as it can contribute to increases in bacterial regrowth in drinking water distribution systems or wastewater effluent receiving waters (Escobar and Randall 2001).…”

Section: Introductionmentioning

confidence: 99%

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Application of UV absorbance and fluorescence indicators to assess the formation of biodegradable dissolved organic carbon and bromate during ozonation

Cao

Young

et al. 2017

Water Research

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This study examined the significance of changes of UV absorbance and fluorescence of dissolved organic matter (DOM) as surrogate indicators for assessing the formation of bromate and biodegradable dissolved organic carbon (BDOC) during the ozonation of surface water and wastewater effluent. Spectroscopic monitoring was carried out using benchtop UV/Vis and fluorescence spectrophotometers and a newly developed miniature LED UV/fluorescence sensor capable of rapidly measuring UVA280 and protein-like and humic-like fluorescence. With the increase of O/DOC mass ratio, the plots of BDOC formation were characterized of initial lag, transition slope and final plateau. With the decrease of UV absorbance and fluorescence, BDOC concentrations initially increased slowly and then rose more noticeably. Inflection points in plots of BDOC versus changes of spectroscopic indicators were close to 35-45% loss of UVA254 or UVA280 and 75-85% loss of humic-like fluorescence. According to the data from size exclusion chromatography (SEC) with organic carbon detection and 2D synchronous correlation analyses, DOM fractions assigned to operationally defined large biopolymers (apparent molecular weight, AMW>20 kDa) and medium AMW humic substances (AMW 5.5-20 kDa) were transformed into medium-size building blocks (AMW 3-5.5 kDa) and other smaller AMW species (AMW<3 kDa) associated with BDOC at increasing O/DOC ratios. Appreciable bromate formation was observed only after the values of UVA254, UVA280 and humic-like fluorescence in O-treated samples were decreased by 45-55%, 50-60% and 86-92% relative to their respective initial levels. No significant differences in plots of bromate concentrations versus decreases of humic-like fluorescence were observed for surface water and wastewater effluent samples. This was in contrast with the plots of bromate concentration versus UVA254 and UVA280 which exhibited sensitivity to varying initial bromide concentrations in the investigated water matrixes. These results suggest that measurements of humic-like fluorescence can provide a useful supplement to UVA indices for characterization of ozonation processes.

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Section: Degradation Of Fluorophoressupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Application of UV absorbance and fluorescence indicators to assess the formation of biodegradable dissolved organic carbon and bromate during ozonation

Cao

Young

et al. 2017

Water Research

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“…The most obvious effect of ozone in organic-loaded water samples is decolourisation. Fluoropores are more reactive than DOC, and so they are oxidised faster through the addition of ozone (Liu et al, 2015), thus affecting fluorescence intensity (Korshin et al, 1999) and consequently making spectra-based methods the most suitable for online monitoring, due to their high sensitivity and ease of use (Hudson et al, 2007;Li et al, 2016). Electrophilic oxidants, such as ozone and chlorine in general break down chromophoric groups within the structure and decrease fluorescence, while advanced oxidation breaks down the DOM into smaller chromophoric fractions, thereby enhancing fluorescence (Henderson et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Use of fluorescence spectroscopy to control ozone dosage in recirculating aquaculture systems

Spiliotopoulou¹,

Martin²,

Pedersen

et al. 2017

Water Research

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The aim of this study was to investigate the potential of fluorescence spectroscopy to be used as an ozone dosage determination tool in recirculating aquaculture systems (RASs), by studying the relationship between fluorescence intensities and dissolved organic matter (DOM) degradation by ozone, in order to optimise ozonation treatment. Water samples from six different Danish facilities (two rearing units from a commercial trout RAS, a commercial eel RAS, a pilot RAS and two marine water aquariums) were treated with different O dosages (1.0-20.0 mg/L ozone) in bench-scale experiments, following which fluorescence intensity degradation was eventually determined. Ozonation kinetic experiments showed that RAS water contains fluorescent organic matter, which is easily oxidised upon ozonation in relatively low concentrations (0-5 mg O/L). Fluorescence spectroscopy has a high level of sensitivity and selectivity in relation to associated fluorophores, and it is able to determine accurately the ozone demand of each system. The findings can potentially be used to design offline or online sensors based on the reduction by ozone of natural fluorescent-dissolved organic matter in RAS. The suggested indirect determination of ozone delivered into water can potentially contribute to a safer and more adequate ozone-based treatment to improve water quality.

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“…Production of these EfOM oxidation products is also correlated with EEM changes [71]. Another study examined the OH· exposures and attendant changes of fluorescence-based parameters, which allowed for establishment of strong linear relationships between formation of the aldehydes and carboxylic acids and the relative changes of integrated fluorescence [81].…”

Section: Aops For Treatment Of Effluent Organic Matters In Biologicalmentioning

confidence: 99%

Advanced Oxidation Processes (AOPs) in Wastewater Treatment

2015

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Advanced oxidation processes (AOPs) were first proposed in the 1980s for drinking water treatment and later were widely studied for treatment of different wastewaters. During the AOP treatment of wastewater, hydroxyl radicals (OH·) or sulfate radicals (SO 4 ·− ) are generated in sufficient quantity to remove refractory organic matters, traceable organic contaminants, or certain inorganic pollutants, or to increase wastewater biodegradability as a pre-treatment prior to an ensuing biological treatment. In this paper, we review the fundamental mechanisms of radical generation in different AOPs and select landfill leachate and biologically treated municipal wastewater as model wastewaters to discuss wastewater treatment with different AOPs. Generally, the treatment efficiencies rely heavily upon the selected AOP type, physical and chemical properties of target pollutants, and operating conditions. It would be noted that other mechanisms, besides hydroxyl radical or sulfate radical-based oxidation, may occur during the AOP treatment and contribute to the reduction of target pollutants. Particularly, we summarize recent advances in the AOP treatment of landfill leachate, as well as advanced oxidation of effluent organic matters (EfOM) in biologically treated secondary effluent (BTSE) for water reuse.

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Formation of aldehydes and carboxylic acids in ozonated surface water and wastewater: A clear relationship with fluorescence changes

Cited by 55 publications

References 45 publications

Application of UV absorbance and fluorescence indicators to assess the formation of biodegradable dissolved organic carbon and bromate during ozonation

Application of UV absorbance and fluorescence indicators to assess the formation of biodegradable dissolved organic carbon and bromate during ozonation

Use of fluorescence spectroscopy to control ozone dosage in recirculating aquaculture systems

Advanced Oxidation Processes (AOPs) in Wastewater Treatment

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