C4-C14-alkyl nitrates as organic trace compounds in air

1994 ◽  
Vol 350 (6) ◽  
pp. 395-402 ◽  
Author(s):  
Oliver Luxenhofer ◽  
Karlheinz Ballschmiter
Keyword(s):  
Alkyl Nitrates ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

Analysing surface water-groundwater interactions on selected sites of the River Moselle: Identifying transport processes along an important inland waterway in Germany

2021 ◽  
Author(s):  
Simon Mischel ◽  
Michael Engel ◽  
Sabrina Quanz ◽  
Dirk Radny ◽  
Axel Schmidt ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Surface Water ◽  
Transport Processes ◽  
Main Stream ◽  
Flow Conditions ◽  
Inland Waterway ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Longitudinal Sampling ◽  
Organic Trace

<p>Hydraulic engineering structures like locks affect the natural hydraulic conditions and have a relevant impact on surface water – groundwater interactions due to enlarging the hydraulic gradient. For this, these sites are excellent areas to study associated flow paths, mass transport and their spatial and temporal variability in higher detail. However, no large-scale study at an inland waterway is available in Germany until now.</p><p>Our work aims to close this gap by applying a multiparameter approach for analyzing surface water-groundwater-interactions by using pH, electrical conductivity, major ions in combination with various other tracers like stable water isotopes, 222-Rn, and tritium. In this context, we also investigate the usability of organic trace compounds and their associated transformation products as potential new tracers.</p><p>The main study approach is based on the hypothesis that i) gaining stream sections show relatively high 222-Rn concentrations originating from discharging groundwater and ii) losing stream sections which are characterized by low 222-Rn concentrations as well as lower tritium and organic trace compounds inventories compared to unaffected areas.</p><p>During different flow-scenarios of the river Moselle, we test these hypotheses by means of a high-resolution longitudinal sampling at 2 km intervals of the main stream (along 242 km) and its major tributaries in combination with groundwater sampling at numerous wells.</p><p>Here, we present the first results of the longitudinal sampling campaign of the river Moselle in October 2020, which took place during intermediate flow conditions (Q=200 m³/s). We used on-site and in-situ 222-Rn measurements and electrical conductivity as a tracer to immediately identify zones along the Moselle with increased groundwater inflow.</p><p>With the use of these tracers, we will deepen the conceptual process understanding of surface water – groundwater interactions occurring at larger streams and during different flow conditions, which may lead to a general river characterization of losing and gaining stream reaches. Moreover, understanding the sources of water compounds and the processes involved during transportation and transformation is crucial for maintaining a good quality of the water body, which is key for proper water management. The findings obtained in the region of the Moselle river might be further transferred to other waterways and support decision making.</p>

Organic trace compounds in the water of the River Elbe near Hamburg part II

Chemosphere ◽  
1998 ◽  
Vol 36 (9) ◽  
pp. 2103-2118 ◽  
Author(s):  
R. Götz ◽  
O.H. Bauer ◽  
P. Friesel ◽  
K. Roch
Keyword(s):  
River Elbe ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

A Proposed Suite of Indicators for Assessing the Efficiency of Secondary Treatment for the Removal of Organic Trace Compounds — WERF CEC4R08

2011 ◽  
Vol 2011 (11) ◽  
pp. 5041-5048
Author(s):  
Tanja Rauch-Williams ◽  
Eric Dickenson ◽  
Jörg E. Drewes ◽  
Douglas Drury ◽  
Daniel Gerrity ◽  
...  
Keyword(s):  
Secondary Treatment ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

Reduction of organic trace compounds and fresh water consumption by recovery of advanced oxidation processes treated industrial wastewater

2013 ◽  
Vol 69 (1) ◽  
pp. 156-162 ◽  
Author(s):  
S. Bierbaum ◽  
H.-J. Öller ◽  
A. Kersten ◽  
A. Krivograd Klemenčič
Keyword(s):  
Fresh Water ◽  
Advanced Oxidation Processes ◽  
Paper Industry ◽  
Advanced Oxidation ◽  
Organic Load ◽  
Paper Strength ◽  
Oxidation Processes ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

Ozone (O3) has been used successfully in advanced wastewater treatment in paper mills, other sectors and municipalities. To solve the water problems of regions lacking fresh water, wastewater treated by advanced oxidation processes (AOPs) can substitute fresh water in highly water-consuming industries. Results of this study have shown that paper strength properties are not impaired and whiteness is slightly impaired only when reusing paper mill wastewater. Furthermore, organic trace compounds are becoming an issue in the German paper industry. The results of this study have shown that AOPs are capable of improving wastewater quality by reducing organic load, colour and organic trace compounds.

scholarly journals Design of Polymer-Embedded Heterogeneous Fenton Catalysts for the Conversion of Organic Trace Compounds

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 942
Author(s):  
Christoph Horn ◽  
Stephanie Ihmann ◽  
Felix Müller ◽  
Doris Pospiech ◽  
Konstantin B. L. Borchert ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
High Catalytic Activity ◽  
Reactive Black 5 ◽  
Heterogeneous Fenton ◽  
Iron Leaching ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace ◽  
Supported Iron

Advanced oxidation processes are the main way to remove persistent organic trace compounds from water. For these processes, heterogeneous Fenton catalysts with low iron leaching and high catalytic activity are required. Here, the preparation of such catalysts consisting of silica-supported iron oxide (Fe2O3/SiOx) embedded in thermoplastic polymers is presented. The iron oxide catalysts are prepared by a facile sol–gel procedure followed by thermal annealing (calcination). These materials are mixed in a melt compounding process with modified polypropylenes to stabilize the Fe2O3 catalytic centers and to further reduce the iron leaching. The catalytic activity of the composites is analyzed by means of the Reactive Black 5 (RB5) assay, as well as by the conversion of phenol which is used as an example of an organic trace compound. It is demonstrated that embedding of silica-supported iron oxide in modified polypropylene turns the reaction order from pseudo-first order (found for Fe2O3/SiOx catalysts), which represents a mainly homogeneous Fenton reaction, to pseudo-zeroth order in the polymer composites, indicating a mainly heterogeneous, surface-diffusion-controlled process.

Risk assessment for organic trace compounds in wastewater: comparison of conventional and advanced treatment

2007 ◽  
Vol 56 (5) ◽  
pp. 9-13 ◽  
Author(s):  
F. Schwätter ◽  
C.B. Hannich ◽  
T. Nöthe ◽  
J. Oehlmann ◽  
H. Fahlenkamp
Keyword(s):  
Risk Assessment ◽  
Wastewater Treatment ◽  
Membrane Filtration ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Advanced Treatment ◽  
Treatment Technologies ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace

The elimination of organic trace compounds in municipal wastewater was analysed at three German wastewater treatment plants. Additionally, the effects of advanced treatment, membrane filtration, adsorption and oxidation processes were investigated. To assess the ecotoxicity of effluents, a number of tools were used: substance-specific evaluation, case studies for combined effects and risk assessment on the basis of cumulative parameters. The results of the research projects revealed that aquatic environmental risks can be reduced significantly using advanced treatment technologies for wastewater treatment plants.

Organic trace compounds in the water of the River Elbe near Hamburg Part I

Chemosphere ◽  
1998 ◽  
Vol 36 (9) ◽  
pp. 2085-2101 ◽  
Author(s):  
R. Götz ◽  
O.H. Bauer ◽  
P. Friesel ◽  
K. Roch
Keyword(s):  
River Elbe ◽  
Trace Compounds ◽  
Organic Trace Compounds ◽  
Organic Trace
Sign in / Sign up

Export Citation Format

Share Document