scholarly journals Effect of chlorination and ozone pre-oxidation on the photobacteria acute toxicity for dissolved organic matter from sewage treatment plants

2011 ◽  
Vol 41 (1) ◽  
pp. 91-96
Author(s):  
Hua ZHANG ◽  
HuiJuan LIU ◽  
JiuHui QU
Keyword(s):  
Organic Matter ◽  
Acute Toxicity ◽  
Dissolved Organic Matter ◽  
Sewage Treatment ◽  
Sewage Treatment Plants

Understanding the long-term concentration, flux, composition and processing of dissolved organic carbon in UK rivers

2020 ◽  
Author(s):  
Fred Worrall ◽  
Nicholas Howden ◽  
Timothy Burt
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Matter ◽  
Dissolved Organic Carbon ◽  
Sewage Treatment ◽  
Resource Limitation ◽  
Credible Interval ◽  
Bayesian Hierarchical ◽  
Doc Flux ◽  
The Uk

<p>Dissolved organic carbon (DOC) represents an important component of the terrestrial and fluvial carbon cycle as it represents a flux from terrestrial carbon stores and while it transfers through the fluvial network it can be processed to release greenhouse gases to the atmosphere. Furthermore, DOC is a major water resource limitation as the dissolved organic matter has to be removed prior to treatment. Therefore, we need to understand the concentration and fluxes of DOC and they change across a landscape between the terrestrial source and the tidal limit.</p><p>Our ability to understand the processing of terrestrial and fluvial carbon has been limited by the range of catchments that have been considered and the time scale over which they have been considered. Studies focused on similar catchment types and very little means of comparing between catchments. However, if we can access and understand large datasets we can find general principles which control DOC and the relative importance of these controls. In this study we use two datasets. The first, is a dataset sampled across the UK for major rivers (270 catchments) from 1974 and this dataset is ideal for understanding flux to the continental shelf and this dataset has over 50000 datapoints. Secondly, many of these sites are monitored for a rang e of other parameters that are related to the composition of the dissolved organic matter. The important covariates for DOM composition are BOD, which is a measure of DOM decomposition, and COD which is measure of the oxidation state of the DOM. All the study catchments could be characterised by a range of covariate information, eg. soil cover, land use, hydro-climatology. To make maximum use of this data the dataset was considered within a Bayesian hierarchical framework.</p><p>The concentrations of DOC from the UK rose for the 1974 on to the late 1990s before a decline to 2007-08. The decline was driven by changes in urban sources, particular by improvements in sewage treatment. The DOC flux from the UK has declined since a peak in 2000 and in 2017 was 767 ktonnes C/yr (95% credible interval 644 – 909 ktonnesC/yr). Modelling composition turnover gives the DOC flux from source as 3.5 Mtonnes C/yr with 2.6 Mtonnes C/yr lost to atmosphere (14 Mtonnes CO<sub>2eq</sub>/yr = 59 tonnes CO<sub>2eq</sub>/km2/yr).</p>

scholarly journals Roles of the particulate phases in pharmaceuticals spatio-temporal dynamics in a peri-urban stream

2020 ◽  
Author(s):  
Lauriane Ledieu ◽  
Anaëlle Simonneau ◽  
Olivier Cerdan ◽  
Laëtitia Fougère ◽  
Emilie Destandau ◽  
...  
Keyword(s):  
Organic Matter ◽  
Psychiatric Hospital ◽  
Temporal Dynamics ◽  
Sewage Treatment ◽  
Suspended Particles ◽  
Urban Stream ◽  
Bed Load ◽  
Piping System ◽  
Cleaning Efficiency ◽  
Sewage Treatment Plants

<p>Wastewaters are highly contaminated waters by anthropogenic compounds. To limit the propagation of these contaminants in water bodies and allow safe reuse of this resource, sewage treatment plants were developed. For the last few decades, many studies evidenced the partial cleaning efficiency of these systems. Many compounds, such as pharmaceuticals, are therefore designated as emerging contaminants. Most of the studies investigated sewage treatment plants releasing rates, but spatial and temporal behaviours of pharmaceuticals in natural environments received less attention. In this study, 27 pharmaceuticals were investigated into both water, bed-load sediments and suspended particles from a small tributary of the Loire River: a peri-urban stream named Egoutier (Loiret, France). The catchment area of the Egoutier is characterized by an upstream/downstream anthropogenic gradient and the presence of two sewage stations whose effluents are released in the watercourse: one coming from the Central Army Pharmacy, a second one draining a psychiatric hospital and a last one defining a bad connection of the pluvial piping system. Only 13 pharmaceuticals were found in our samples. Cationic compounds, such as doxepin, metoprolol, atenolol, codeine and trimethoprim, were mostly adsorbed on mineral phases, except tramadol appearing mostly associated with organic matter, like the anionic and neutral compounds, such as sulfamethoxazole, ibuprofen, diclofenac, acetaminophen, diazepam, carbamazepine and oxazepine. High spatial and temporal variabilities were observed. Bed-load geochemistry fluctuations appear linked to the sedimentary dynamic from both suspended particles and organic matter. In the suspended particles fraction, pharmaceuticals contents seem to be driven by grain-size distribution. Variations in pharmaceutical inputs and low half-life of some molecules also have an influence on both particulate fractions contents.  In this way, some compounds highly biodegradable, such as acetaminophen, are accumulated near to their emission zones, while other molecules highly transported in suspended particles, for example diazepam, are transported over the stream and mostly accumulated in bed-load sediments during dry periods. On the contrary, compounds adsorb on coarser particles, such as trimethoprim, have higher propagation distances during humid periods. Some molecules could be used as sourcing markers. Indeed, codeine is for example exclusively released by the psychiatric hospital. In the same way, sulfamethoxazole, ibuprofen, tramadol and codeine are specifically emitted from the Central Army Pharmacy and the psychiatric hospital. This study improve the understanding of pharmaceuticals adsorption, dispersion and accumulation in receiving environments. Moreover, it allow better distinction between domestic consumption releases and hospital and/or pharmacy facilities impacts.</p>

Oxidation of dissolved organic matter in the effluent of a sewage treatment plant using ozone combined with hydrogen peroxide (O3/H2O2)

2009 ◽  
Vol 149 (1-3) ◽  
pp. 311-318 ◽  
Author(s):  
Roberto Rosal ◽  
Antonio Rodríguez ◽  
José Antonio Perdigón-Melón ◽  
Alice Petre ◽  
Eloy García-Calvo
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant
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