Photochemical degradation of PAHs in estuarine surface water: effects of DOM, salinity, and suspended particulate matter

Shang, Jing; Chen, Jing; Shen, Zhenyao; Xiao, Xuze; Yang, Huichao; Wang, Ying; Ruan, Aidong

doi:10.1007/s11356-015-4543-2

Cited by 41 publications

(24 citation statements)

References 47 publications

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“…These results support the conclusion that LWM PAHs (such as 3-ring PAHs) can be biodegraded more rapidly than HMW PAHs (such as 6-ring PAHs) [46,47], as the LWM PAHs degradation by-product, HCO 3 − , was probably increased [30]. It was reported that high salinity can accelerate the photodegradation of PAHs [48], but chloride as the representative ion of salinity, had a positive correlation with 2-ring PAHs and 3-ring PAHs (R 2 = 0.52 and R 2 = 0.82) in October 2014 for surface water, that might only manifest their coexistent sources. NO 3 was negatively correlated with LMW PAHs during 2014 in surface water, which suggested LMW PAHs removal accompanied by nitrification.…”

Section: Physio-chemical Indices Associated With Pahs Concentrationsupporting

confidence: 86%

Characterizing the Variation of Dissolvable PAHs in Receiving Water in a Reclaimed Water Irrigation Region

Wang

et al. 2020

Water

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Long-term wastewater and reclaimed water irrigation systems constitute the major processes in local water circulation, which concomitantly introduce plenty of undesirable substances that can threaten water quality, ecosystem functions and human health. At the Southeast Reclaimed Water Irrigation Region (SRWIR) of Beijing, wastewater irrigation was adopted from 1969 to 2002, and second-treated effluents (reclaimed water) has been used thereafter. Polycyclic aromatic hydrocarbons (PAHs) were the most ubiquitously detected contaminant in wastewater and reclaimed water and are reported to be carcinogenic. Hence, we measured the concentrations of dissolved sixteen United States Environmental Protection Agency (USEPA) priority PAHs in surface water and groundwater at the SRWIR to characterize their spatial and temporal variations, and to clarify the role of reclaimed water to natural water. The concentration of 16 individual PAHs in reclaimed water, rivers and groundwater varied from 339.4 to 636.2 ng/L, 359.1 to 3435.0 ng/L and 216.5 to 488,205.2 ng/L, respectively. The lower aromatic rings of PAHs prevailed in aquatic environments rather than the higher ones. Thereinto, naphthalene was the predominant isomer within the highest concentration reached to 486,600 μg/L. The groundwater samples had higher PAHs concentrations at Tongzhou district which attributed to the higher vulnerability of aquifer. Additionally, strong correlations between PAHs and total nitrogen, nitrate, dissolved oxygen and electrical conductivity suggested those potential factors affecting the photo degradation and/or biodegradation of PAHs. The relationship identified between PAHs concentrations and physical and chemical indices would help us to enhance the understanding migration and transformation of PAHs spatially and temporally, enable us to assess the potential risks of the environmental pollutants to aquatic organisms and human water supplies.

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Section: Physio-chemical Indices Associated With Pahs Concentrationsupporting

confidence: 86%

Characterizing the Variation of Dissolvable PAHs in Receiving Water in a Reclaimed Water Irrigation Region

Wang

et al. 2020

Water

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“…Particulate-bound hydrocarbons may be thus deposited to sediment through vertical sinking (Dachs et al 2002;Duran and Cravo-Laureau 2016), transferred from sediment to water column via sediment resuspension events (Eggleton and Thomas 2004;Ko et al 2003), transferred to dissolved water phase from desorption processes (Baker et al 1991), may undergo photodegradation and biodegradation (Dachs et al 1999;Shang et al 2015) or may enter marine food web through ingestion of particles by filter feeders (Akkanen et al 2012). Overall, the fate and dynamics of hydrocarbons in the water column are largely driven by their partitioning between the particulate and dissolved phases, which is quantified via the particulate-water or particulate organic carbon (POC)-water partition coefficients (K d and K oc , respectively) (Herbes 1977).…”

Section: Introductionmentioning

confidence: 99%

Natural and anthropogenic particulate-bound aliphatic and polycyclic aromatic hydrocarbons in surface waters of the Gulf of Gabès (Tunisia, southern Mediterranean Sea)

Fourati

Tedetti

Guigue

et al. 2017

Environ Sci Pollut Res

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Particulate-bound aliphatic and polycyclic aromatic hydrocarbons (AHs and PAHs) were investigated in the surface waters of the Gulf of Gabès (Tunisia, southern Mediterranean Sea). Samples were collected off the Sfax and Gabès-Ghannouch coasts. Concentrations in total resolved n-alkanes ranged from 0.03 to 3.2 μg L, and concentrations in total parents + alkylated PAHs ranged from bdl to 108.6 ng L. The highest concentrations were recorded in the southern Sfax. AHs were mainly of biogenic origin with odd n-alkane predominance, although an anthropogenic contribution was also detected. The PAH molecular patterns revealed a mixed origin with the presence of low molecular weight and alkylated compounds, characteristic of uncombusted oil-derived products, and the presence of high molecular weight compounds, typical of combustion residues. Rainfall events induced an increase in PAH concentrations by a factor 1.5-23.5. The particle-water partition coefficients (K) suggest that the partitioning of PAHs between the particulate and dissolved phases is driven by hydrophobicity and organic matter composition.

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“…The removal efficiencies were 51.6%, 86.6%, 92.0%, and 91.8% for CK 1 , CK 2 , T 1 , and T 2 , respectively. The removal of PHE in the control treatment showed that the abiotic loss of PHE (mainly through photodegradation and volatilization) (Luo et al, 2014;Shang et al, 2015) could beyond 50%. The removal efficiency of PHE in the U. prolifera treatment was much higher than that in the control treatment, indicating that U. prolifera was engaged in the removal of PHE.…”

Section: Resultsmentioning

confidence: 99%

Removal of phenanthrene from coastal waters by green tide algae Ulva prolifera

Zhang

Lü

et al. 2017

Science of The Total Environment

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Ulva prolifera (U. prolifera) has been frequently involved in terrible algal proliferation in coastal areas. Although it is known to be associated with green tide, its contribution to the natural attenuation of the polycyclic aromatic hydrocarbons (PAHs) in seawater has not been evaluated. In this study, the removal of phenanthrene using U. prolifera collected from coastal water with green tide blooming was investigated. The results showed that phenanthrene could be removed efficiently in the presence of both the live and heat-killed U. prolifera. The phenanthrene concentrations of the live algae treatment decreased smoothly from 10.00 to 0.80μgL through the whole process, while those of the heat-killed algae treatment decreased sharply from 10.0 to 2.71μgL in one day and kept constantly after that. The in situ monitoring and visualizing using laser confocal scanning microscopy (LCSM) confirmed the accumulation of phenanthrene in U. prolifera. The increase in nutrient and temperature led to the increase of phenanthrene removal rate, while the salinity had less influence on the removal of phenanthrene. The removal efficiency by U. prolifera had a good linear relationship with phenanthrene initial concentration (r=0.999) even at 100μgL which was higher than its environmentally relevant concentrations. High removal efficiency (91.3%) was observed when the initial phenanthrene concentration was set at environmental relevant concentration (5μgL). Results of this study demonstrate a potential new natural attenuation process for typical PAHs in coastal water during the outbreak of green tide. These findings indicate that the outbreak of harmful green tide algae may bring positive environmental benefits in the terms of the removal of harmful organic pollutants from coastal waters.

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Photochemical degradation of PAHs in estuarine surface water: effects of DOM, salinity, and suspended particulate matter

Cited by 41 publications

References 47 publications

Characterizing the Variation of Dissolvable PAHs in Receiving Water in a Reclaimed Water Irrigation Region

Characterizing the Variation of Dissolvable PAHs in Receiving Water in a Reclaimed Water Irrigation Region

Natural and anthropogenic particulate-bound aliphatic and polycyclic aromatic hydrocarbons in surface waters of the Gulf of Gabès (Tunisia, southern Mediterranean Sea)

Removal of phenanthrene from coastal waters by green tide algae Ulva prolifera

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