scholarly journals Particulate and Dissolved Organic Matter in Stormwater Runoff Influences Oxygen Demand in Urbanized Headwater Catchments

2021 ◽  
Author(s):  
Kelly M. McCabe ◽  
Erik M. Smith ◽  
Susan Q. Lang ◽  
Christopher L. Osburn ◽  
Claudia R. Benitez-Nelson
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Stormwater Runoff ◽  
Oxygen Demand ◽  
Headwater Catchments

scholarly journals Role of Environmental Variables in the Transport of Microbes in Stormwater

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1146
Author(s):  
Rupak Aryal ◽  
Jatinder P.S. Sidhu ◽  
Meng Nan Chong ◽  
Simon Toze ◽  
Wolfgang Gernjak ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Environmental Variables ◽  
Stormwater Runoff ◽  
Average Concentration ◽  
Microbial Pathogens ◽  
Weather Events ◽  
Enterococcus Spp ◽  
Trivalent Cations

Microbial pathogens present in stormwater, which originate from human sewage and animal faecal matters, are one of the major impediments in stormwater reuse. The transport of microbes in stormwater is more than just a physical process. The mobility of microbes in stormwater is governed by many factors, such as dissolved organic matter, cations, pH, temperature and water flow. This paper examined the roles of three environmental variables, namely: dissolved organic matter, positive cations and stormwater flow on the transport of two faecal indicator bacteria (FIB), Enterococcus spp. and Escherichia coli. Stormwater runoff samples were collected during twelve wet weather events and one dry weather event from a medium density residential urban catchment in Brisbane. Enterococcus spp. numbers as high as 3 × 104 cfu/100 mL were detected in the stormwater runoff, while Escherichia coli numbers up to 3.6 × 103 cfu/100 mL were observed. The dissolved organic carbon (DOC) in the stormwater samples was in the range of 2.2–5.9 mg/L with an average concentration of 4.5 mg/L in which the hydrophilic carbon constituted the highest mass fraction of 60–80%. The results also showed that the transport of FIB in stormwater was reduced with an increasing concentration of the hydrophilic organic fraction, especially the humic fraction. On the contrary, the concentration of trivalent cations and stormwater flow rate showed a positive correlation with the FIB numbers. These findings indicated the potentiality to make a good use and measurement of simple environmental variables to reflect the degree of microbe transport in stormwater from residential/suburban catchments.

Dissolved organic matter in urban stormwater runoff at three typical regions in Beijing: chemical composition, structural characterization and source identification

RSC Advances ◽  
2015 ◽  
Vol 5 (90) ◽  
pp. 73490-73500 ◽  
Author(s):  
Chen Zhao ◽  
Chong-Chen Wang ◽  
Jun-Qi Li ◽  
Chao-Yang Wang ◽  
Peng Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Dissolved Organic Matter ◽  
Structural Characterization ◽  
Source Identification ◽  
Stormwater Runoff ◽  
Urban Stormwater ◽  
Urban Stormwater Runoff

Chemical composition, structural characterization and source identification of DOM in urban stormwater runoff collected from three typical regions in Beijing were investigated.

scholarly journals Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments

2017 ◽  
Vol 3 (2) ◽  
pp. 378-405 ◽  
Author(s):  
J. Fouché ◽  
M. J. Lafrenière ◽  
K. Rutherford ◽  
S. Lamoureux
Keyword(s):  
Climate Change ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Active Layer ◽  
Climate Change Impacts ◽  
High Arctic ◽  
Low Molecular Weight ◽  
Headwater Catchments ◽  
Precipitation Regimes ◽  
Spring Freshet

Arctic landscapes are experiencing intense warming and modification of precipitation regimes with climate change. Permafrost disturbances and climate change impacts on hydrology of Arctic watersheds are likely to modify the quantity and composition of exported dissolved organic matter (DOM). In July 2007, intense rainfall and active layer thickening caused widespread active layer detachments at Cape Bounty, Melville Island (Canada). This study investigates the impacts of seasonal hydrology and permafrost disturbance on DOM composition exported from High Arctic headwater catchments. In 2012, streams were sampled from three disturbed catchments and one undisturbed catchment. The composition of DOM was characterized using absorbance and fluorescence spectroscopy. DOM was mostly exported during the spring freshet. Throughout this period, the undisturbed catchment exported humified DOM with high humic-like fluorescence that likely originated from runoff through shallow organic rich soil. In contrast, DOM exported from disturbed catchments was fresher, less humified with a high proportion of low molecular weight humic acid. We demonstrate that disturbed catchments delivered likely more labile DOM derived from either thawed permafrost or enhanced microbial activity. If this labile DOM comes from an ancient pool, as indicated by other studies at this site, disturbances may strengthen the permafrost carbon feedback on climate change.

Dissolved organic matter characteristics of urban stormwater runoff from different functional regions during grassy swale treatment

2019 ◽  
Vol 107 ◽  
pp. 105667 ◽  
Author(s):  
Donghai Yuan ◽  
Yechen An ◽  
Jiazhuo Wang ◽  
Shaoxiong Chu ◽  
Bongsu Lim ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Stormwater Runoff ◽  
Urban Stormwater ◽  
Functional Regions ◽  
Urban Stormwater Runoff

Characterisation and reactivity continuum of dissolved organic matter in forested headwater catchments of Andean Patagonia

2018 ◽  
Vol 63 (9) ◽  
pp. 1049-1062 ◽  
Author(s):  
Roberto Daniel Garcia ◽  
María del Carmen Diéguez ◽  
Marina Gerea ◽  
Patricia Elizabeth Garcia ◽  
Mariana Reissig
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Headwater Catchments ◽  
Reactivity Continuum
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