scholarly journals Distribution of antibiotics in the vadose zone in Xiaodian Sewage Irrigation Area, Northern China

2019 ◽  
Vol 98 ◽  
pp. 09016
Author(s):  
Jiale Li ◽  
Yihui Dong ◽  
Zhanxue Sun ◽  
Huijun Ding
Keyword(s):  
Vadose Zone ◽  
Soil Profile ◽  
Flow Direction ◽  
Northern China ◽  
Sewage Sample ◽  
Sewage Irrigation ◽  
Lateral Migration ◽  
Wet Season ◽  
Water Shortages ◽  
Irrigation Area

Because of water shortages, the Xiaodian area in northern China had a long history of sewage irrigation. To study the distribution of antibiotics in the vadose zone, a sewage sample and 5 soil profiles were collected and analyzed. Macrolides and Fluoroquinolones were the main antibiotics observed in the shallow vadose zone. The contents of antibiotics in the soil profile nearby the sewage irrigation area were 2-3 times greater than in the groundwater irrigation area, indicating that sewage irrigation has had a significant impact on the contents of antibiotics in the soil. The elevation of antibiotic contents during the wet season is likely related to the fluctuating water level within the shallow vadose zone. The distribution of antibiotics is influenced by the flow direction of irrigation water. Moreover, the possibility of introducing antibiotics into the soil of the shallow vadose via the lateral recharge of sewage in the Beizhang Drainage Canal can not be excluded. Approximately 50 % of Fluoroquinolones were reduced in the upper 50 cm of the soil zone and 70 % at 80 cm depth. Tetracyclines may have experienced significant lateral migration. Macrolides and Sulfonamides (SMs) have similar soil profile distributions, with a concentration decrease down to 20 cm depth.

Chemical Fractions and Mobility of Cd, Cu, Pb and Zn in Soil Profile of a Sewage Irrigation Area, Northwest China

2016 ◽  
Vol 13 (S1) ◽  
pp. S13-S20 ◽  
Author(s):  
Bailin Liu ◽  
Shiwei Ai ◽  
Rui Guo ◽  
Liang Ren ◽  
Wenya Zhang ◽  
...  
Keyword(s):  
Soil Profile ◽  
Northwest China ◽  
Sewage Irrigation ◽  
Irrigation Area ◽  
Chemical Fractions

Chemical Fractions and Mobility of Cd, Cu, Pb and Zn in Soil Profile of a Sewage Irrigation Area, Northwest China

2016 ◽  
Vol 13 (S1) ◽  
pp. S13-S20 ◽  
Author(s):  
Bailin Liu ◽  
Shiwei Ai ◽  
Rui Guo ◽  
Liang Ren ◽  
Wenya Zhang ◽  
...  
Keyword(s):  
Soil Profile ◽  
Northwest China ◽  
Sewage Irrigation ◽  
Irrigation Area ◽  
Chemical Fractions

On Offset Placement of a Compound Droplet in a Channel Flow

2021 ◽  
Author(s):  
Jagannath Mahato ◽  
Dhananjay Kumar Srivastava ◽  
Dinesh Kumar Chandraker ◽  
Rajaram Lakkaraju
Keyword(s):  
Viscosity Ratio ◽  
Stokes Equations ◽  
Temporal Dynamics ◽  
Flow Direction ◽  
Navier Stokes ◽  
Volume Of Fluid Method ◽  
Lateral Migration ◽  
Navier Stokes Equations ◽  
Deformation Patterns ◽  
Compound Droplet

Abstract Investigations on flow dynamics of a compound droplet have been carried out in a two-dimensional fully-developed Poiseuille flow by solving the Navier-Stokes equations with the evolution of the droplet using the volume of fluid method with interface compression. The outer droplet undergoes elongation similar to a simple droplet of same size placed under similar ambient condition in the flow direction, but, the inner droplet evolves in compressed form. The compound droplet is varied starting from the centerline towards the walls of the channel. The simulations showed that on applying an offset, asymmetric slipper-like shapes are observed as opposed to symmetric bullet-like shapes through the centerline. Temporal dynamics, deformation patterns, and droplet shell pinch-off mode vary with the offset, with induction of lateral migration. Also, investigations are done on the effect of various parameters like droplet size, Capillary number, and viscosity ratio on the deformation magnitude and lateral migration.

Accumulation of heavy metal in scalp hair of people exposed in Beijing sewage discharge channel sewage irrigation area in Tianjin, China

2017 ◽  
Vol 24 (15) ◽  
pp. 13741-13748 ◽  
Author(s):  
Zuwei Wang ◽  
Xiaoman Yu ◽  
Mingshuo Geng ◽  
Zilu Wang ◽  
Qianqian Wang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Discharge Channel ◽  
Scalp Hair ◽  
Sewage Irrigation ◽  
Irrigation Area ◽  
Sewage Discharge

scholarly journals China’s South-to-North Water Diversion Project Empowers Sustainable Water Resources System in the North

2019 ◽  
Vol 11 (13) ◽  
pp. 3735 ◽  
Author(s):  
Giri R. Kattel ◽  
Wenxiu Shang ◽  
Zhongjing Wang ◽  
John Langford
Keyword(s):  
Water Resources ◽  
Environmental Sustainability ◽  
Northern China ◽  
Water Diversion ◽  
Water Infrastructure ◽  
Water Shortages ◽  
Water Resources System ◽  
Goods And Services ◽  
Water Diversion Project ◽  
North Water

Global freshwaters are severely depleted. Provision of improved water infrastructure technologies and innovation can address challenges posed by water shortages to environmental sustainability. China’s South-to-North Water Diversion Project has generated extensive debates over sustainability of water resources system in the northern drier region, which faces severe water scarcity hindering ecosystems, agriculture, industries and livelihoods. Some arguments extend the views that large infrastructure projects can have negative implications for biodiversity conservation and ecosystem goods and services. However, this study strengthens the opposite view, as such projects would resolve increasing environmental challenges northern China has been facing over many decades due to severe water shortages. The project empowers connectivity among individuals, community, and organizations that the sustainability of goods and services such as energy, irrigation and water supply are perceived, and livelihoods and the standard of peoples’ living is improved. A resilient, robust and adaptive water infrastructure framework can overcome the challenges of water shortages by meeting a long term social, economic and environmental goals for water resources systems in northern China. Such framework can also identify the thresholds of change and the threats associated with environmental sustainability.

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