scholarly journals Spatio-temporal Variation in Nutrient Profiles and Exchange Fluxes at the Sediment-Water Interface in Yuqiao Reservoir, China

2019 ◽  
Vol 16 (17) ◽  
pp. 3071 ◽  
Author(s):  
Wen ◽  
Wu ◽  
Yang ◽  
Jiang ◽  
Zhong
Keyword(s):  
Pore Water ◽  
Water Source ◽  
Water Soluble ◽  
Drinking Water Source ◽  
Eutrophic Lakes ◽  
Overlying Water ◽  
Total N ◽  
Yuqiao Reservoir ◽  
Nutrient Profiles ◽  
Main Component

Nutrients released from sediments have a significant influence on the water quality in eutrophic lakes and reservoirs. To clarify the internal nutrient load and provide reference for eutrophication control in Yuqiao Reservoir, a drinking water source reservoir in China, pore water profiles and sediment core incubation experiments were conducted. The nutrients in the water (soluble reactive P (SRP), nitrate-N (NO3−-N), nitrite-N (NO2−-N), and ammonium-N (NH4+-N)) and in the sediments (total N (TN), total P (TP) and total organic carbon (TOC)) were quantified. The results show that NH4+-N was the main component of inorganic N in the pore water. NH4+-N and SRP were higher in the pore water than in the overlying water, and the concentration gradient indicated a diffusion potential from the sediment to the overlying water. The NH4+-N, NO3−-N, and SRP fluxes showed significant differences amongst the seasons. The NH4+-N and SRP fluxes were significantly higher in the summer than in other seasons, while NO3−-N was higher in the autumn. The sediment generally acted as a source of NH4+-N and SRP and as a sink for NO3−-N and NO2−-N. The sediments release 1133.15 and 92.46 tons of N and P, respectively, to the overlying water each year.

Exploration of Relationships between Phytoplankton Biomass and Related Environmental Variables in a Eutrophic Shallow Lake

2012 ◽  
Vol 518-523 ◽  
pp. 194-200
Author(s):  
Lan Qi ◽  
Ya Zhangya ◽  
Jin Hui Huang
Keyword(s):  
Drinking Water ◽  
Environmental Variables ◽  
Phytoplankton Biomass ◽  
Oxygen Demand ◽  
Water Source ◽  
Drinking Water Source ◽  
Positive Relationships ◽  
Eutrophic Lakes ◽  
Seasonal Periodicity ◽  
Phytoplankton Variability

As the only drinking water source of Tianjin, Yuqiao reservoir had experienced several algae blooms in recent years, which had adversely impacted on the safety of drinking water supply and reservoir management. In this article, the relationship between phytoplankton biomass and related environmental variables has been evaluated in inter-annual and seasonal scale using factor analysis and liner regression method base on the monthly monitoring data covering the period of 2004-2009. The results indicate that water temperature and total phosphorus (TP) played governing roles in phytoplankton biomass in most seasons (i.e. temperature in winter and summer; TP in autumn); COD (chemical oxygen demand) presented significant positive relationships with phytoplankton biomass in autumn and BOD (biological oxygen demand) shows opposite trend with it. However, a complex interplay was found between phytoplankton biomass and nitrogen considering significant positive relationships occurring between them in spring and autumn. The results indicate that interactions between phytoplankton biomass and related environmental variables are highly sensitive to seasonal periodicity, which improves understanding of different roles of biotic and abiotic variables upon phytoplankton variability, and hence, advances management methods for eutrophic lakes.

scholarly journals Significant Temporal and Spatial Variability in Nutrient Concentrations in a Chinese Eutrophic Shallow Lake and Its Major Tributaries

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 217
Author(s):  
Xiaomei Su ◽  
Alan D. Steinman ◽  
Yunlin Zhang ◽  
Hong Ling ◽  
Dan Wu
Keyword(s):  
Water Column ◽  
Pore Water ◽  
Nutrient Enrichment ◽  
External Loading ◽  
Nutrient Concentrations ◽  
Eutrophic Lakes ◽  
Total N ◽  
Temporal And Spatial Variability ◽  
West Part ◽  
Different Seasons

Sediment nutrients can be released to the surface water when hydraulic disturbance becomes strong in shallow lakes, which contributes to nutrient enrichment and subsequent lake eutrophication in the water column. To explore the seasonal variations and spatial distributions exhibited by nutrients in the water column, surface sediment, and pore water of Lake Yangcheng and its major tributaries, we determined the concentrations of nitrogen (N) and phosphorus (P) throughout the lake in different seasons of 2018. Total N (TN) and total P (TP) concentrations in the connected rivers were much greater than those in the lake, indicating that external loading greatly contributed to the nutrient enrichment. TN concentration in the water column was highest in the winter, whereas TP peaked in the summer. A similar temporal pattern was observed for TN and TP in the sediment with maxima in the winter and minima in the summer; however, nutrients in the pore water were highest in the summer, in contrast to the temporal variation in the sediment. Additionally, high TN values in the water column and high TP in the three compartments were distributed primarily in the west part of the lake, while high TN concentrations in the sediment and pore water were observed mainly in the east portion of the lake. According to the enrichment factor index (an indicator evaluating the nutrient enrichment by comparing the detected contents and standard values), nutrients in the lake sediment were severely enriched with TN and TP averaging 2195.8 mg/kg and 543.0 mg/kg, respectively. The vertical distribution of TN and TP generally exhibited similar decreasing patterns with an increase in sediment depth, suggesting mineralization of TN and TP by microbes and benthic organisms. More attention and research are needed to understand the seasonality of nutrient exchange across the sediment–water interface, especially in eutrophic lakes.

scholarly journals Distribution, toxicity load, and risk assessment of dissolved metal in surface and overlying water at the Xiangjiang River in southern China

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhifeng Huang ◽  
Saisai Zheng ◽  
Yan Liu ◽  
Xingru Zhao ◽  
Xiaocui Qiao ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Drinking Water ◽  
Ecological Risk ◽  
Southern China ◽  
Water Source ◽  
Carcinogenic Risk ◽  
Drinking Water Source ◽  
Dissolved Metals ◽  
Overlying Water ◽  
Xiangjiang River

AbstractMetal pollution in drinking water source has been under scrutiny as it seriously affects human health. This work examined 12 dissolved metals in the surface and overlying water of the Xiangjiang River, an important drinking water source in southern China, and characterized their distribution, identified their possible sources, assessed their toxicity load, and determined their potential ecological and health risk. No significant difference was found in the metal concentration between surface and overlying water. The average metal concentration fell in the order of Mg > Mn > Ba > Fe > Zn > As > Sb > Ni > Cd > V > Cr > Co, and all was lower than the safety threshold in the drinking water guideline of China. Anthropogenic activities were found to be the main source of metals from correlation analysis, principal component analysis (PCA), and cluster analysis (CA). According to the total heavy metal toxicity load (HMTL), 98.20%, 71.54%, 68.88%, and 7.97% of As, Cd, Sb, and Mn should be removed from the surface water to ensure safety. Most water samples from the surveyed area were found to have high ecological risk as was measured by the ecological risk index (RI). Health risk assessment showed that children are more susceptible than adults to the non-carcinogenic risk of dissolved metals, and the potential carcinogenic risk (CR) of As and Cd should be addressed. The results provide guidance for controlling the metal pollution of the Xiangjiang River and improving its quality as a drinking water source.

Global return flow ratio

2017 ◽  
Author(s):  
Chloé Meyer
Keyword(s):  
Drinking Water ◽  
Water Source ◽  
Return Flow ◽  
Drinking Water Source ◽  
Chemical Contamination ◽  
Flow Ratio ◽  
Piped Water ◽  
Dug Wells

Population using an improved drinking water source (piped water into dwellings, yards or plots; public taps or standpipes; boreholes or tubewells; protected dug wells; or protected springs and rainwater) that is located on premises and available when needed and which is free of faecal and priority chemical contamination. Basin Pollution Quality Waste

scholarly journals Are children’s stools in Ghana disposed of safely? Evidence from the 2014 Ghana demographic and health survey

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Abdul-Aziz Seidu
Keyword(s):  
Drinking Water ◽  
Health Survey ◽  
Water Source ◽  
Demographic And Health Survey ◽  
Outcome Variable ◽  
Drinking Water Source ◽  
Safe Disposal ◽  
Toilet Facility ◽  
Improved Sanitation ◽  
Northern Zone

Abstract Background Safe disposal of children’s faeces has always been one of the main challenges to good hygiene in Ghana. Although it has been proven that children’s faeces are more likely to spread diseases than adults’ faeces, people usually mistake them for harmlessness. This study, therefore, sought to determine the prevalence and factors associated with safe disposal of children’s faeces in Ghana. Methods Data from the 2014 Ghana Demographic and Health Survey was used for the analysis. A sample size of 2228 mother-child pairs were used for the study. The outcome variable was disposal of children stools. Both bivariate and multivariable logistic regression analyses were performed to identify the factors with safe child stool disposal. Results The prevalence of safe child stool disposal in Ghana was 24.5%. Women in the middle [Adjusted odds ratio (AOR) = 4.62; Confidence Interval (CI) = 3.00–7.10], Coastal Zone [AOR = 4.52; CI = 2.82–7.22], mothers whose children were aged 12–17 [AOR = 1.56; CI = 1.15–2.13] and 18–23 months [AOR = 1.75; CI = 1.29–2.39], and mothers whose household had improved type of toilet facility [AOR = 2.04; CI = 1.53–2.73] had higher odds of practicing safe children’s faeces disposal. However, women from households with access to improved source of drinking water [AOR = 0.62; CI = 0.45–2.7] had lower odds of practicing safe children’s faeces disposal. Conclusion Approximately only about 25 out of 100 women practice safe disposal of their children’s faeces in Ghana. The age of the child, ecological zone, the type of toilet facilities, and the type of drinking water source are associated with the disposal of child faeces. These findings have proven that only improved sanitation (i.e. drinking water and toilet facilities) are not enough for women to safely dispose of their children’s faeces. Therefore, in addition to provision of toilet facilities especially in the northern zone of Ghana, there is also the need to motivate and educate mothers on safe disposal of children’s stools especially those with children below 12 months. More so, mothers without access to improved toilet facility should also be educated on the appropriate ways to bury their children’s stools safely.

Divergent responses of diverse microalgae commonly found in drinking water source water to UV-C treatment

2021 ◽  
Author(s):  
Jordan Roszell ◽  
Po-Shun Chan ◽  
Brian Petri ◽  
Ted Mao ◽  
Kathleen Nolan ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Source ◽  
Drinking Water Source ◽  
Source Water ◽  
Uv C

scholarly journals Hydrochemistry of sediment pore water in the Bratsk reservoir (Baikal region, Russia)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
V. I. Poletaeva ◽  
E. N. Tirskikh ◽  
M. V. Pastukhov
Keyword(s):  
Pore Water ◽  
Ionic Composition ◽  
Water System ◽  
Water Reservoir ◽  
Environmental Parameters ◽  
Water Area ◽  
Pore Waters ◽  
Overlying Water ◽  
Major Ion ◽  
Bratsk Reservoir

AbstractThis study aimed to identify the factors responsible for the major ion composition of pore water from the bottom sediments of the Bratsk water reservoir, which is part of the largest freshwater Baikal-Angara water system. In the Bratsk reservoir, the overlying water was characterized as HCO3–Ca–Mg type with the mineralization ranging between 101.2 and 127.7 mg L−1 and pore water was characterized as HCO3–SO4–Ca, SO4–Cl–Ca–Mg and mixed water types, which had mineralization varying from 165.9 to 4608.1 mg L−1. The ionic composition of pore waters varied both along the sediment depth profile and across the water area. In pore water, the difference between the highest and lowest values was remarkably large: 5.1 times for K+, 13 times for Mg2+, 16 times for HCO3−, 20 times for Ca2+, 23 times for Na+, 80 times for SO42−, 105 times for Cl−. Such variability at different sites of the reservoir was due to the interrelation between major ion concentrations in the pore water and environmental parameters. The major factor responsible for pore water chemistry was the dissolution of sediment-forming material coming from various geochemical provinces. In the south part of the reservoir, Cl−, Na+ and SO42− concentrations may significantly increase in pore water due to the effect of subaqueous flow of highly mineralized groundwater.

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