scholarly journals Fate of Trace Organic Compounds in the Hyporheic Zone: Influence of Retardation, the Benthic Biolayer, and Organic Carbon

2019 ◽  
Vol 53 (8) ◽  
pp. 4224-4234 ◽  
Author(s):  
Jonas L. Schaper ◽  
Malte Posselt ◽  
Camille Bouchez ◽  
Anna Jaeger ◽  
Gunnar Nuetzmann ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Organic Compounds ◽  
Hyporheic Zone ◽  
Trace Organic Compounds ◽  
Trace Organic

scholarly journals Fate of Trace Organic Compounds in Hyporheic Zone Sediments of Contrasting Organic Carbon Content and Impact on the Microbiome

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3518
Author(s):  
Cyrus Rutere ◽  
Malte Posselt ◽  
Marcus A. Horn
Keyword(s):  
Organic Carbon ◽  
Organic Compounds ◽  
Hyporheic Zone ◽  
Community Dynamics ◽  
Rrna Gene ◽  
Organic Carbon Content ◽  
Trace Organic Compounds ◽  
Sediment Samples ◽  
Removal Efficiencies ◽  
Trace Organic

The organic carbon in streambed sediments drives multiple biogeochemical reactions, including the attenuation of organic micropollutants. An attenuation assay using sediment microcosms differing in the initial total organic carbon (TOC) revealed higher microbiome and sorption associated removal efficiencies of trace organic compounds (TrOCs) in the high-TOC compared to the low-TOC sediments. Overall, the combined microbial and sorption associated removal efficiencies of the micropollutants were generally higher than by sorption alone for all compounds tested except propranolol whose removal efficiency was similar via both mechanisms. Quantitative real-time PCR and time-resolved 16S rRNA gene amplicon sequencing revealed that higher bacterial abundance and diversity in the high-TOC sediments correlated with higher microbial removal efficiencies of most TrOCs. The bacterial community in the high-TOC sediment samples remained relatively stable against the stressor effects of TrOC amendment compared to the low-TOC sediment community that was characterized by a decline in the relative abundance of most phyla except Proteobacteria. Bacterial genera that were significantly more abundant in amended relative to unamended sediment samples and thus associated with biodegradation of the TrOCs included Xanthobacter, Hyphomicrobium, Novosphingobium, Reyranella and Terrimonas. The collective results indicated that the TOC content influences the microbial community dynamics and associated biotransformation of TrOCs as well as the sorption potential of the hyporheic zone sediments.

Sorption of Hydrophobic Trace Organic Compounds in Groundwater Systems

1985 ◽  
Vol 17 (9) ◽  
pp. 39-55 ◽  
Author(s):  
R. P. Schwarzenbach ◽  
J. Westall
Keyword(s):  
Organic Carbon ◽  
Partition Coefficient ◽  
Carbon Content ◽  
Organic Compounds ◽  
Aqueous Phase ◽  
Sorption Behavior ◽  
Organic Carbon Content ◽  
Chlorinated Phenols ◽  
Trace Organic Compounds ◽  
Trace Organic

Factors influencing the subsurface sorption behavior of neutral and ionizable trace organic compounds are discussed. At equilibrium, the sorption of a neutral hydrophobic organic compound can be expressed by a simple partition coefficient. Partition coefficients, and thus retardation factors, may be estimated from the octanol/water partition coefficient of the compound and the organic carbon content of the aquifer material, if the organic carbon content exceeds 0.1%. For ionizable (anionic) hydrophobic compounds (represented by chlorinated phenols), the distribution ratio depends on both the pH and ionic strength of the aqueous phase, in contrast to the partitioning model for neutral compounds in which the composition of the aqueous phase is relatively unimportant.

scholarly journals The fate of polar trace organic compounds in the hyporheic zone

2018 ◽  
Vol 140 ◽  
pp. 158-166 ◽  
Author(s):  
Jonas L. Schaper ◽  
Wiebke Seher ◽  
Gunnar Nützmann ◽  
Anke Putschew ◽  
Martin Jekel ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Hyporheic Zone ◽  
Trace Organic Compounds ◽  
Trace Organic

Simultaneous fate of trace organic compounds and dissolved organic matter in surface water and the hyporheic zone of an urban river

2020 ◽  
Author(s):  
Birgit Maria Mueller ◽  
Hanna Schulz ◽  
Anke Putschew ◽  
Jörg Lewandowski
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Dissolved Organic Matter ◽  
Organic Compounds ◽  
Water Samples ◽  
Hyporheic Zone ◽  
Treated Wastewater ◽  
Turnover Rates ◽  
Trace Organic Compounds ◽  
Trace Organic

<p>Rivers being influenced by treated wastewater are characterized by an altered water chemistry compared to their natural state. Downstream of the outlet of a wastewater treatment plant (WWTP), concentrations of dissolved organic matter (DOM) and trace organic compounds (TrOCs) in the receiving river are increased. As DOM might serve as a metabolic co-substrate during microbial TrOC degradation, DOM influences the attenuation of TrOCs. Due to steep biochemical gradients at the surface water - groundwater interface, the hyporheic zone is considered a hotspot for microbial activity. Therefore, turnover rates in the hyporheic zone of a stream are high in comparison to the turnover rates in the water column. The River Erpe is a sandy lowland river in the East of Berlin, Germany, which receives treated wastewater from the WWTP Muenchehofe. In order to study the simultaneous fate of TrOCs and DOM in surface water and the hyporheic zone, a field sampling campaign was conducted at a side channel of the River Erpe. Surface water samples were taken at site A and both surface and pore water samples from 25 cm sediment depth were taken at site B which is 850 m downstream of site A. The sampling interval was every three hours over 48 hours. Samples were analysed for 17 TrOCs (HPLC-MS/MS) and the molecular composition of DOM (FT-ICR MS). DOM compound classes were calculated semi-quantitatively as the percentage share of each class of the whole DOM composition. Mean concentrations of the TrOCs analysed changed by an increase of 200 % to a decrease of 29 % in the surface water between site A and B and by a decrease of 5 to 93 % in the hyporheic zone at site B. The molecular composition of DOM changed at most by a single digit percentage per compound group with the attenuation being larger in the hyporheic zone. The percentage share of two out of seven DOM compound classes significantly correlated with the concentration of at least ten TrOCs between surface water at site A and B. Such a correlation was observed for five compound classes in the hyporheic zone at site B. The present study shows that the attenuation of both TrOCs and DOM in a sandy urban river mainly takes place in the hyporheic zone but it is not capable of assuming a causal relationship between the attenuation of TrOCs and DOM.</p>

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