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.

Dual impact of dissolved organic matter on cytotoxicity of PVP-Ag NPs to Escherichia coli: Mitigation and intensification

Chemosphere ◽  
2019 ◽  
Vol 214 ◽  
pp. 754-763 ◽  
Author(s):  
Weicheng Zhang ◽  
Jiaolong Huang ◽  
Lei Liang ◽  
Lunguang Yao ◽  
Tao Fang
Keyword(s):  
Escherichia Coli ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Ag Nps

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 Distribution, seasonality, and fluxes of dissolved organic matter in the Pearl River (Zhujiang) estuary, China

2019 ◽  
Vol 16 (13) ◽  
pp. 2751-2770 ◽  
Author(s):  
Yang Li ◽  
Guisheng Song ◽  
Philippe Massicotte ◽  
Fangming Yang ◽  
Ruihuan Li ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Average Concentration ◽  
Spatiotemporal Variability ◽  
Pearl River ◽  
Head Region ◽  
The Pearl River ◽  
Protein Rich

Abstract. Dissolved organic carbon (DOC) concentration in the Pearl River estuary (PRE) of China was measured in May, August, and October 2015 and January 2016. Chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) in the latter three seasons were characterized by absorption and fluorescence spectroscopy. CDOM and FDOM exhibited negligible seasonal variations, while DOC displayed a significant seasonality, with the average concentration being highest in May (156 µmol L−1), lowest in November (87 µmol L−1), and comparable between January (118 µmol L−1) and August (112 µmol L−1). Although DOC, CDOM, and FDOM in surface water were generally higher than in bottom water, the difference between the two layers was statistically insignificant. DOC showed little cross-estuary variations in all seasons, while CDOM and FDOM in January were higher on the west side of the estuary than on the east side. All three variables showed rapid drawdowns in the head region of the estuary (salinity <5); their dynamics in the main estuary were primarily controlled by conservative mixing, leading to linearly declining or relatively constant (for DOC in May and November only) contents with increasing salinity. The decrease in FDOM with salinity was 5 %–35 % faster than that of CDOM, which in turn was 2–3 times quicker than that of DOC. Salinity and CDOM absorption coefficients could serve as indicators of DOC in August and January. Freshwater endmembers in all seasons mainly contained fresh, protein-rich DOM of microbial origin, a large part of it likely being pollution-derived. Protein-like materials were preferentially consumed in the head region but the dominance of the protein signature was maintained throughout the estuary. Exports of DOC and CDOM (in terms of the absorption coefficient at 330 nm) into the South China Sea were estimated as 195×109 g and 266×109 m2 for the PRE and 362×109 g and 493×109 m2 for the entire Pearl River Delta. The PRE presents the lowest concentrations and export fluxes of DOC and CDOM among the world's major estuaries. DOM delivered from the PRE is, however, protein-rich and thus may enhance heterotrophs in the adjacent coastal waters. Overall, the PRE manifests lower abundance and smaller spatiotemporal variability of DOM than expected for a sizable estuary with a marked seasonality of river runoff due supposedly to the poorly forested watershed of the Pearl River, the rapid degradation of the pollution-derived DOM in the upper reach, and the short residence time of freshwater.

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