Photodegradation of 17β-estradiol in aquatic solution under solar irradiation: Kinetics and influencing water parameters

Chowdhury, Rajib Roy; Charpentier, Paul A.; Ray, Madhumita B.

doi:10.1016/j.jphotochem.2011.01.019

Cited by 114 publications

(53 citation statements)

References 32 publications

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“…DOM and NO 3 -are common photosensitizers in water. DOM can promote the photodegradation by photo-inducing free radicals such as hydroxyl radicals (OHÁ), peroxyl radicals (ROOÁ), and singlet oxygen ( 1 O 2 ) (Chowdhury et al 2011). NO 3 -can also produce OHÁ when excited by UV light at a wavelength between 290 and 330 nm (Nélieu et al 2004).…”

Section: Degradation Of Edcs In Lake Watermentioning

confidence: 99%

Occurrence and Fate of Selected Endocrine-Disrupting Chemicals in Water and Sediment from an Urban Lake

Huang

Lin

et al. 2014

Arch Environ Contam Toxicol

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Occurrence of five endocrine-disrupting chemicals (EDCs)-bisphenol-A (BPA), triclosan (TCS), 17a-ethinyl estradiol (EE2), benzophenone-3, and 4-methylbenzylidene camphor-were monitored in East Lake, the largest urban lake in China. Other than EE2, all selected EDCs were detected at least once in the lake water with concentrations B89.1 ng/L. EDCs were detected with greater occurrence in spring than in other seasons. In lake sediment, TCS was detected at the greatest concentration (30.9 ng g -1 ), whereas BPA and EE2 were not detected. Spatial distribution of the EDCs in the lake water and the lake sediment showed similar patterns, and greater EDC residuals were found from those sites with known wastewater input. The linear adsorption coefficients (K d ) varied from 17.9 to 1,017 L kg -1 and were related to the octanolwater partition coefficient (K ow ) values of the compounds. Photodegradation was a major process removing the EDCs from the lake water, and the presence of dissolved organic material and NO 3 -in the lake water can accelerate the photodegradation process. Degradation of the EDCs in the lake sediment was relatively slow and occurred mainly due to the microbial processes. All compounds were found more persistent under anoxic conditions than under oxic conditions.

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Section: Degradation Of Edcs In Lake Watermentioning

confidence: 99%

Occurrence and Fate of Selected Endocrine-Disrupting Chemicals in Water and Sediment from an Urban Lake

Huang

Lin

et al. 2014

Arch Environ Contam Toxicol

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“…The presence of suspended solids in the influent can absorb and scatter UV radiation thus reducing the overall process efficiency (Ling et al, 2004). Chowdhury et al (2011) observed that the degradation of 17-β-estradiol decreased with increasing turbidity in the test solution. Rincon et al (2003) also reported that water turbidity higher than 30 NTU will severely affect the efficiency of photocatalytic disinfection.…”

Section: [Figure 3]mentioning

confidence: 99%

Removal of emerging trace organic contaminants by MBR-based hybrid treatment processes

Nguyen

Hai

Kang

et al. 2013

International Biodeterioration & Biodegradation

122

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The aim of this study was to demonstrate the complementarity of combining membrane bioreactor (MBR) treatment with UV oxidation or high pressure membrane filtration processes such as nanofiltration (NF) or reverse osmosis (RO) for the removal of trace organic contaminants (TrOC). The results suggest that the removal mechanisms of TrOC by either UV oxidation or NF/RO membrane filtration differ significantly from those of an MBR system. Thus, they can complement MBR treatment very well to significantly improve the removal of TrOC. MBR treatment can effectively remove hydrophobic and readily biodegradable hydrophilic TrOC. The remaining hydrophilic and biologically persistent TrOC were shown to be effectively removed by either UV oxidation or NF/RO membrane filtration. The combination of MBR with UV oxidation or NF/RO membrane filtration resulted in a removal ranging from 85% to complete removal (or removal to below the analytical detection limit) of all 22 TrOC selected in this study. In particular, it is noteworthy that although MBR treatment and direct UV oxidation separately achieved low removal of carbamazepine (a widely reported problematic compound), the combination of these two processes resulted in more than 96% removal. RESEARCH HIGHLIGHTS:• MBR, UV oxidation, and NF/RO membranes remove TrOC based on different mechanisms.• MBR could effectively remove hydrophobic and readily biodegradable TrOC.• Chlorinated TrOC and TrOC with a phenolic group are readily degraded by UV oxidation.• NF/RO membranes can effectively reject charged and hydrophilic TrOC.• Thus, MBR-UV or MBR-NF/RO hybrid systems are very effective for removing TrOC.2 AbstractThe aim of this study was to demonstrate the complementarity of combining membrane bioreactor (MBR) treatment with UV oxidation or high pressure membrane filtration processes such as nanofiltration (NF) or reverse osmosis (RO) for the removal of trace organic contaminants (TrOC). The results suggest that the removal mechanisms of TrOC by either UV oxidation or NF/RO membrane filtration differ significantly from those of an MBR system. Thus, they can complement MBR treatment very well to significantly improve the removal of TrOC.MBR treatment can effectively remove hydrophobic and readily biodegradable hydrophilicTrOC. The remaining hydrophilic and biologically persistent TrOC were shown to be effectively removed by either UV oxidation or NF/RO membrane filtration. The combination of MBR with UV oxidation or NF/RO membrane filtration resulted in a removal ranging from 85% to complete removal (or removal to below the analytical detection limit of (or less than) 20 ng/L) of all 22TrOC selected in this study. Of particular interest was the fact that although MBR treatment and direct UV oxidation separately both achieved low removal of carbamazepine (a widely reported problematic compound), the combination of these two processes resulted in more than 96%removal.

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“…Emerging contaminants, such as pesticides, in surface water (rivers, lakes and reservoirs) can have adverse effects on the environment, which has become a worldwide concern . The massive and prolonged utilization of pesticides in agriculture as well as their slow degradation rate may explain their frequent occurrence in the environment.…”

Section: Introductionmentioning

confidence: 99%

Study of the Photodegradation Kinetics and Pathways of Hexaflumuron in Liquid Media

Yin

Liu

et al. 2014

Photochem & Photobiology

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Hexaflumuron, one of the benzoylphenylurea insect growth regulators, can be leached into surface water and thus having a potential impact on aquatic organisms. In this study, the photodegradation processes of hexaflumuron under high-pressure mercury lamp irradiation were assessed. The photodegradation kinetics were studied, as were the effects of pH, different light sources, organic solvents and environmental substances, including nitrate ions (NO3(-)), nitrite ions (NO2(-)), ferrous ions (Fe(2+)), ferric ions (Fe(3+)), humic acid, sodium dodecyl sulfate (SDS) and hydrogen peroxide (H2O2). Three photodegradation products in methanol were identified by gas chromatography-mass spectrometry (GC-MS). In general, the degradation of hexaflumuron followed first-order kinetics. In the four media studied, the photodegradation rate order was n-hexane > methanol > ultrapure water > acetone. Faster degradation was observed under high-pressure mercury lamp irradiation than under xenon lamp irradiation. The pH had a considerable effect, with the most rapid degradation occurring at pH 5.0. The photodegradation rate of hexaflumuron was promoted in the presence of NO3(-), NO2(-), Fe(2+), humic acid, SDS and H2O2, but inhibited by Fe(3+). Moreover, the presumed photodegradation pathway was proposed to be the cleavage of the urea linkage.

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Photodegradation of 17β-estradiol in aquatic solution under solar irradiation: Kinetics and influencing water parameters

Cited by 114 publications

References 32 publications

Occurrence and Fate of Selected Endocrine-Disrupting Chemicals in Water and Sediment from an Urban Lake

Occurrence and Fate of Selected Endocrine-Disrupting Chemicals in Water and Sediment from an Urban Lake

Removal of emerging trace organic contaminants by MBR-based hybrid treatment processes

Study of the Photodegradation Kinetics and Pathways of Hexaflumuron in Liquid Media

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