Integrated monitoring of particle associated transport of PAHs in contrasting catchments

Schwientek, Marc; Hermann, R.; Beckingham, Barbara; Kuch, Bertram; Grathwohl, Peter

doi:10.1016/j.envpol.2012.09.004

Cited by 65 publications

(46 citation statements)

References 34 publications

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“…Low‐molecular weight PAHs were detected in the overlying water during high flow conditions at low concentrations (0.034 to 0.0521 μg/L). However, PAHs are more likely to be transported into the site bound to suspended sediments than dissolved in the water column (Meyer et al ; Schwientek et al ). The C SS for Miller Creek and Coffee Creek ranged from 2.1 to 11.7 mg/L and 10.3 to 16.4 mg/L, respectively, and are consistent with reports for Miller Creek during high flow conditions (South St. Louis SWCD ).…”

Section: Resultsmentioning

confidence: 99%

The utility of solid‐phase microextraction in evaluating polycyclic aromatic hydrocarbon bioavailability during habitat restoration with dredged material at moderately contaminated sites

Brennan

Johnson

2017

Integr Envir Assess & Manag

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The over- or underprediction of risk in moderately contaminated sediments can have a large impact on the nature of applied management strategies given that concentrations border on being toxic or not toxic. Project managers should give significant consideration as to how moderate levels of contaminants in native sediments and dredged material used for restoration will impact recovery of habitat. Total solid-phase (C ) and porewater (C ) polycyclic aromatic hydrocarbons (PAHs) were quantified in native sediments and dredged material to determine if the predictions of risk from C are consistent with those based on C . The sediment matrix phase in which PAHs were quantified resulted in disparate conclusions regarding the predicted reduction in contamination following restoration. Total solid-phase PAH concentrations suggested a significant decrease following restoration, whereas little to no change was observed in measured C . Risk metrics based on C gave inconclusive estimates for toxicity, whereas measured C suggested toxicity is unlikely, a conclusion consistent with toxicity testing. The incorporation of black carbon (BC) into model estimates for C gave predictions more consistent with measured C , suggesting that geochemical conditions (especially BC) play an important part in predicting toxicity at moderately contaminated sites. In addition to the use of C in toxicity evaluation, in-situ C measurements provided a constraint on diffusive PAH loads from sediment relative to ongoing stream loads. If passive sampling had been employed during the sampling designs and site evaluations, the costs of toxicity testing would not have been incurred, given that C suggested little to no toxicity. The results from the project highlight the benefits to be gained by moving beyond inconclusive, screening-level C metrics and implementing more sensitive and accurate C metrics in assessments of risk in moderately contaminated sediments. Integr Environ Assess Manag 2018;14:212-223. © 2017 SETAC.

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Section: Resultsmentioning

confidence: 99%

The utility of solid‐phase microextraction in evaluating polycyclic aromatic hydrocarbon bioavailability during habitat restoration with dredged material at moderately contaminated sites

Brennan

Johnson

2017

Integr Envir Assess & Manag

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“…It discharges into a river with a catchment area of 140 km 2 which is characterized by agriculture and urban impact. Compared to the receiving river of WWTP A, the proportion of urbanized area in the catchment and the proportion of industrial wastewater received by WWTP B are much higher [33].…”

Section: Study Sitesmentioning

confidence: 94%

Influence of different wastewater treatment technologies on genotoxicity and dioxin-like toxicity in effluent-exposed fish

et al. 2018

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Background: In situ exposure of rainbow trout up-and downstream of differently equipped wastewater treatment plants (WWTPs) and subsequent analyses of micronuclei frequencies and hepatic EROD activities were used to evaluate the impact of the effluents on fish health. Two of the facilities (WWTPs A and B) were conventional treatment plants. WWTP C has been equipped with a powdered activated carbon stage. Here, analyses were conducted prior and subsequent to this upgrade. Results:Differences did not only occur when comparing conventional (WWTPs A, B and C prior to the upgrade) and advanced treatment (WWTP C after the upgrade), but also between the conventionally equipped WWTPs. There was no indication for genotoxic effects or pollution-related EROD induction in fish exposed at WWTP A. In contrast, trout exposed at WWTP B expressed strong reactions. However, here, adverse reactions were also observed in fish kept upstream. Similar observations were made for EROD activities in fish exposed at WWTP C prior to the upgrade, whereas genotoxic effects could only be seen in trout kept downstream of this effluent. Upgrading of WWTP C resulted in a significant reduction of both genotoxic effects and EROD levels. Conclusions:The results show financial investments in advanced wastewater treatment to be beneficial for aquatic ecosystems, especially when conventional technologies do not sufficiently remove pollutants. Yet, negative impacts of effluents on aquatic organisms can, under certain conditions, also be avoided by conventional treatment. Therefore, we recommend deciding on the necessity and the type of WWTP upgrading on a case-by-case basis. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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“…Further processes that may remove substances from the water column are sedimentation after sorption to particles (Schwientek et al, 2013) or direct sorption to the bed substrate. The former process is believed to be negligible in the studied case since observed turbidities were consistently below 2 NTU (nephelometric turbidity unit) corresponding to very low suspended solids concentrations of 2-3 mg L − 1 (Rügner et al, 2014).…”

Section: Temporal Dynamics Of the Removal Processesmentioning

confidence: 99%

A high-precision sampling scheme to assess persistence and transport characteristics of micropollutants in rivers

Schwientek

Guillet

Hermann

et al. 2016

Science of The Total Environment

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Increasing numbers of organic micropollutants are emitted into rivers via municipal wastewaters. Due to their persistence many pollutants pass wastewater treatment plants without substantial removal. Transport and fate of pollutants in receiving waters and export to downstream ecosystems is not well understood. In particular, a better knowledge of processes governing their environmental behavior is needed. Although a lot of data are available concerning the ubiquitous presence of micropollutants in rivers, accurate data on transport and removal rates are lacking. In this paper, a mass balance approach is presented, which is based on the Lagrangian sampling scheme, but extended to account for precise transport velocities and mixing along river stretches. The calculated mass balances allow accurate quantification of pollutants' reactivity along river segments. This is demonstrated for representative members of important groups of micropollutants, e.g. pharmaceuticals, musk fragrances, flame retardants, and pesticides. A model-aided analysis of the measured data series gives insight into the temporal dynamics of removal processes. The occurrence of different removal mechanisms such as photooxidation, microbial degradation, and volatilization is discussed. The results demonstrate, that removal processes are highly variable in time and space and this has to be considered for future studies. The high precision sampling scheme presented could be a powerful tool for quantifying removal processes under different boundary conditions and in river segments with contrasting properties.

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Integrated monitoring of particle associated transport of PAHs in contrasting catchments

Cited by 65 publications

References 34 publications

The utility of solid‐phase microextraction in evaluating polycyclic aromatic hydrocarbon bioavailability during habitat restoration with dredged material at moderately contaminated sites

The utility of solid‐phase microextraction in evaluating polycyclic aromatic hydrocarbon bioavailability during habitat restoration with dredged material at moderately contaminated sites

Influence of different wastewater treatment technologies on genotoxicity and dioxin-like toxicity in effluent-exposed fish

A high-precision sampling scheme to assess persistence and transport characteristics of micropollutants in rivers

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