Is the Hyporheic Zone Relevant beyond the Scientific Community?

Water, Journal Year: 2019, Volume and Issue: 11(11), P. 2230 - 2230

Published: Oct. 25, 2019

Rivers are important ecosystems under continuous anthropogenic stresses. The hyporheic zone is a ubiquitous, reactive interface between the main channel and its surrounding sediments along river network. We elaborate on physical, biological, biogeochemical drivers processes within that have been studied by multiple scientific disciplines for almost half century. These previous efforts shown modulator most metabolic stream serves as refuge habitat diverse range of aquatic organisms. It also exerts major control water quality increasing contact time with environments, which in turn results retention transformation nutrients, trace organic compounds, fine suspended particles, microplastics, among others. paper showcases critical importance zones, both from an applied perspective, their role ecosystem services to answer question manuscript title. identifies research gaps our understanding processes. In conclusion, we highlight potential restoration efficiently manage reactivate functions corridors.

Language: Английский

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

Environmental Science & Technology, Journal Year: 2019, Volume and Issue: 53(8), P. 4224 - 4234

Published: March 24, 2019

The fate of 28 trace organic compounds (TrOCs) was investigated in the hyporheic zone (HZ) an urban lowland river Berlin, Germany. Water samples were collected hourly over 17 h and three depths HZ using minipoint samplers. four relatively variable time series subsequently used to calculate first-order removal rates retardation coefficients via a one-dimensional reactive transport model. Reversible sorption processes led substantial many TrOCs along flow path. Some TrOCs, such as dihydroxy-carbamazepine, O-desmethylvenlafaxine, venlafaxine, found be stable HZ. Others readily removed with half-lives first 10 cm ranging from 0.1 ± 0.01 for iopromide 3.3 0.3 tramadol. Removal rate constants majority highest HZ, where biodegradable dissolved matter also highest. Because conditions oxic top 30 path, we attribute this finding high microbial activity typically associated shallow Frequent short vertical exchange flows could therefore more important reach-scale TrOC than long, lateral paths.

Language: Английский

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Micropollutant biotransformation and bioaccumulation in natural stream biofilms

Water Research, Journal Year: 2021, Volume and Issue: 193, P. 116846 - 116846

Published: Jan. 18, 2021

Micropollutants are ubiquitously found in natural surface waters and pose a potential risk to aquatic organisms. Stream biofilms, consisting of bacteria, algae other microorganisms potentially contribute bioremediating environments by biotransforming xenobiotic substances. When investigating the stream biofilms remove micropollutants from water column, it is important distinguish between different fate processes, such as biotransformation, passive sorption active bioaccumulation. However, due complex nature biofilm community its extracellular matrix, this task often difficult. In study, we combined biotransformation experiments involving collected up- downstream wastewater treatment plant outfalls with QuEChERS extraction method processes. The proved be suitable for broad range (> 80% investigated compounds). We that 31 out 63 compounds were biotransformed majority being substitution-type biotransformations, have an increased towards specific wastewater-relevant micropollutants. Overall, using experimental analytical strategy developed, demonstrated inherent micropollutant potential, thus bioremediation improving ecosystem health.

Language: Английский

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Metformin Contamination in Global Waters: Biotic and Abiotic Transformation, Byproduct Generation and Toxicity, and Evaluation as a Pharmaceutical Indicator

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(19), P. 13528 - 13545

Published: Sept. 15, 2022

Metformin is the first-line antidiabetic drug and one of most prescribed medications worldwide. Because its ubiquitous occurrence in global waters demonstrated ecotoxicity, metformin, as with other pharmaceuticals, has become a concerning emerging contaminant. subject to transformation, producing numerous problematic transformation byproducts (TPs). The occurrence, removal, toxicity metformin have been continually reviewed; yet, comprehensive analysis pathways, byproduct generation, associated change adverse effects lacking. In this review, we provide critical overview fate during water treatments natural processes compile 32 organic TPs generated from biotic abiotic pathways. These occur aquatic systems worldwide along metformin. Enhanced several compared through organism tests necessitates development complete mineralization techniques for more attention on TP monitoring. We also assess potential indicate overall contamination pharmaceuticals environments, previously acknowledged ones, found be robust or comparable indicator such pharmaceutical contamination. addition, insightful avenues future research

Language: Английский

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Occurrence and Spatiotemporal Dynamics of Pharmaceuticals in a Temperate-Region Wastewater Effluent-Dominated Stream: Variable Inputs and Differential Attenuation Yield Evolving Complex Exposure Mixtures

Environmental Science & Technology, Journal Year: 2020, Volume and Issue: 54(20), P. 12967 - 12978

Published: Sept. 22, 2020

Effluent-dominated streams are becoming increasingly common in temperate regions and generate complex pharmaceutical mixture exposure conditions that may impact aquatic organisms via drug-drug interactions. Here, we quantified spatiotemporal concentrations composition dynamics during baseflow at four sites a temperate-region effluent-dominated stream (upstream, at, progressively downstream from effluent discharge). Samples were analyzed monthly for 1 year 109 pharmaceuticals/degradates using comprehensive U.S. Geological Survey analytical method biweekly 2 years focused on 14 most pharmaceuticals/degradates. We observed strong chemical gradient with pharmaceuticals only sporadically detected upstream the effluent. Seventy-four individual detected, spanning 5 orders of magnitude 0.28 to 13 500 ng/L, 38 compounds >50% samples. "Biweekly" represented 77 ± 8% overall concentration. The antidiabetic drug metformin consistently had highest concentration limited in-stream attenuation. antihistamine fexofenadine inputs greater warm- than cool-season but also attenuated faster. Differential attenuation (i.e., high = citalopram; low metformin) contributed evolution along reach. This research demonstrates variable over multiple differential evolving biota, implications interactive effects.

Language: Английский

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Bacterial Diversity Controls Transformation of Wastewater-Derived Organic Contaminants in River-Simulating Flumes

Environmental Science & Technology, Journal Year: 2020, Volume and Issue: 54(9), P. 5467 - 5479

Published: April 6, 2020

Hyporheic zones are the water-saturated flow-through subsurfaces of rivers which characterized by simultaneous occurrence multiple physical, biological, and chemical processes. Two factors playing a role in hyporheic attenuation organic contaminants sediment bedforms (a major driver exchange) composition microbial community. How these act on diverse range encountered downstream from wastewater treatment plants is not well understood. To address this knowledge gap, we investigated dissipation half-lives (DT50s) 31 substances (mainly pharmaceuticals) under different combinations bacterial diversity bedform-induced flow using 20 recirculating flumes central composite face factorial design. By combining small-volume pore water sampling, targeted analysis, suspect screening, along with quantitative real-time PCR time-resolved amplicon Illumina MiSeq sequencing, determined comprehensive set DT50s, associated communities, transformation products. The resulting DT50s parent compounds ranged 0.5 (fluoxetine) to 306 days (carbamazepine), responding significantly four both flow. Bacterial taxa that were biodegradation included Acidobacteria (groups 6, 17, 22), Actinobacteria (Nocardioides Illumatobacter), Bacteroidetes (Terrimonas Flavobacterium) Proteobacteria (Pseudomonadaceae, Sphingomonadaceae, Xanthomonadaceae). Notable formation valsartan acid irbesartan valsartan, persistence N-desmethylvenlafaxine across all treatments, identification biuret as novel product metformin. Twelve additional target products identified, persistent either or surface at least one treatment, indicating their environmental relevance.

Language: Английский

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What is in Nigerian waters? Target and non-target screening analysis for organic chemicals

Chemosphere, Journal Year: 2021, Volume and Issue: 284, P. 131546 - 131546

Published: July 15, 2021

Language: Английский

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Rate equations, spatial moments, and concentration profiles for mobile-immobile models with power-law and mixed waiting time distributions

Physical review. E, Journal Year: 2022, Volume and Issue: 105(1)

Published: Jan. 4, 2022

We present a framework for systems in which diffusion-advection transport of tracer substance mobile zone is interrupted by trapping an immobile zone. Our model unifies different approaches based on distributed-order diffusion equations, exciton rate models, and random-walk models multirate mobile-immobile mass transport. study various forms the time dynamics their effects Moreover, we find associated breakthrough curves, density at fixed point space as function time, concentration profiles respective moments Specifically, derive explicit anomalous asymptotic power-law decay Mittag-Leffler distribution. In our analysis out that even exponential densities, transient observed. results have direct applications geophysical contexts, but also biological, soft matter, solid state systems.

Language: Английский

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Analysis on the attenuation characteristics of PPCPs in surface water and their influencing factors based on a compilation of literature data

Water Research, Journal Year: 2023, Volume and Issue: 242, P. 120203 - 120203

Published: June 9, 2023

Language: Английский

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Fate of wastewater contaminants in rivers: Using conservative-tracer based transfer functions to assess reactive transport

The Science of The Total Environment, Journal Year: 2018, Volume and Issue: 656, P. 1250 - 1260

Published: Nov. 27, 2018

Interpreting the fate of wastewater contaminants in streams is difficult because their inputs vary time and several processes synchronously affect reactive transport. We present a method to disentangle various influences by performing conservative-tracer test while sampling stream section at locations for chemical analysis micropollutants. By comparing outflow concentrations with tracer signal convoluted inflow series, we estimated reaction rate coefficients calculated contaminant removal along river section. The was tested River Steinlach, Germany, where 38 were monitored. Comparing day-time night-time experiments allowed distinguishing photo-dependent degradation from other elimination processes. While showed be highly efficient metroprolol, bisoprolol, venlafaxine, its impact on similar scale photo-independent when averaged over 24 h. For selection compounds analyzed study, bio- photodegradation higher than previous field studies. In Steinlach observed extraordinarily effective that may due proportion treated wastewater, temperature, DOC nitrate concentrations, but also surface volume ratio low flow conditions favorizes through shallow water column larger transient storage comparable

Language: Английский

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