Direct evidence of microbiological water quality changes on bacterial quantity and community caused by plumbing system

This pilot study was carried out to determine the relationship between microbiological water quality parameters and the occurrence of health complaints among triathletes. Data were collected at an Olympic distance triathlon (n=314) and a run-bike-run (n=81; controls for exposure to fresh water). At the time of the triathlon, the concentrations of Escherichia coli , thermotolerant coliforms, faecal streptococci, entero- and reoviruses, F-specific RNA phages, Salmonella, Campylobacter, Aeromonas, Plesiomonas shigelloides, Pseudomonas aeruginosa and Staphylococcus aureus were examined over the swimming course. Information on the occurrence of health complaints during the competition and in the week thereafter was collected through a written questionnaire. The results show that triathletes and run-bike-runners are comparable with respect to factors other than water exposure (age, sex, training history, physical stress, lower intestinal health complaints during the competition) that may influence the occurrence of health complaints in the week after the competition. Triathletes and run-bike-runners reported gastro-intestinal (7.7% vs 2.5%), respiratory (5.5% vs 3.7%), skin/mucosal (2.6% vs 1.2%), general (3.5% vs 1.2%) and total symptoms (14.8% vs 7.4%) in the week after the event. The health risks for triathletes for all symptom groups are not significantly higher than for run-bike-runners. The geometric mean concentration of faecal indicator bacteria is relatively low: E. coli 170/100 ml; faecal streptococci 13/100 ml, enteroviruses were present at concentrations of 0.1/l. The group of triathletes was homogeneusly and relatively intensely exposed to water; they all swam in the same body of water at the same time and 75% reported to have swallowed freshwater. It was concluded that this study design is suitable to study the relationship between health complaints and microbiological water quality. In the summers of 1993 and 1994, a study will be carried out concerning several run-bike-runs and triathlons in freshwaters of different quality.

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MAKARA, Societal responses to surface water "quality" changes (France, 19th-20th centuries), ANR 12-SENV-009

Impact ◽

10.21820/23987073.2017.6.41 ◽

2017 ◽

Vol 2017 (7) ◽

pp. 41-43

Author(s):

Laurence Lestel

Keyword(s):

Water Quality ◽

Surface Water ◽

Surface Water Quality ◽

Quality Changes

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Multivariate analysis of long term water quality changes of shallow Lake Balaton

SIL Proceedings 1922-2010 ◽

10.1080/03680770.2006.11903050 ◽

2006 ◽

Vol 29 (4) ◽

pp. 2051-2055 ◽

Cited By ~ 1

Author(s):

G. Kiss ◽

Gy. Dévai ◽

B. Tóthmérész ◽

A. Szabó

Keyword(s):

Water Quality ◽

Multivariate Analysis ◽

Shallow Lake ◽

Lake Balaton ◽

Quality Changes

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Evaluation of Seasonal Groundwater Quality Changes Associated with Groundwater Pumping and Level Fluctuations in an Agricultural Area, Korea

Water ◽

10.3390/w13010051 ◽

2020 ◽

Vol 13 (1) ◽

pp. 51

Author(s):

Kyoochul Ha ◽

Eunhee Lee ◽

Hyowon An ◽

Sunghyun Kim ◽

Changhui Park ◽

...

Keyword(s):

Water Quality ◽

Groundwater Quality ◽

Groundwater Level ◽

Irrigation Water ◽

Agricultural Area ◽

Water Type ◽

Quality Changes ◽

Groundwater Pumping ◽

Rice Paddies ◽

Groundwater Levels

This study was conducted to evaluate seasonal groundwater quality due to groundwater pumping and hydrochemical characteristics with groundwater level fluctuations in an agricultural area in Korea. Groundwater levels were observed for about one year using automatic monitoring sensors, and groundwater uses were estimated based on the monitoring data. Groundwater use in the area is closely related to irrigation for rice farming, and rising groundwater levels occur during the pumping, which may be caused by the irrigation water of rice paddies. Hydrochemical analysis results for two separate times (17 July and 1 October 2019) show that the dissolved components in groundwater decreased overall due to dilution, especially at wells in the alluvial aquifer and shallow depth. More than 50% of the samples were classified as CaHCO3 water type, and changes in water type occurred depending on the well location. Water quality changes were small at most wells, but changes at some wells were evident. In addition, the groundwater quality was confirmed to have the effect of saltwater supplied during the 2018 drought by comparison with seawater. According to principal component analysis (PCA), the water quality from July to October was confirmed to have changed due to dilution, and the effect was strong at shallow wells. In the study areas where rice paddy farming is active in summer, irrigation water may be one of the important factors changing the groundwater quality. These results provide a qualitative and quantitative basis for groundwater quality change in agricultural areas, particularly rice paddies areas, along with groundwater level and usage.

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Groundwater physico-chemical properties and water quality changes in shallow aquifers in arid saline wetlands, Ouargla, Algeria

Applied Water Science ◽

10.1007/s13201-021-01415-3 ◽

2021 ◽

Vol 11 (5) ◽

Author(s):

Fethi Medjani ◽

Mohamed Djidel ◽

Sofiane Labar ◽

Louiza Bouchagoura ◽

Chouaib Rezzag Bara

Keyword(s):

Water Quality ◽

Chemical Properties ◽

High Water ◽

Quality Changes ◽

Shallow Aquifers ◽

Shallow Water Table ◽

Chemical Mechanisms ◽

Desert Region ◽

Physico Chemical ◽

Hypersaline Water

AbstractShallow aquifers are vulnerable to natural geogenic processes as well as anthropogenic influences, and this is especially apparent in desert regions. Within arid and hyperarid climates, evaporation is a controlling hydrologic process leads to an important increase in the concentration of dissolved minerals of both surface water and groundwater. In groundwater, this increase is not only dependent on shallow water table depth, but also on the hydraulic properties of sediments present within the unsaturated zone of the aquifer itself. The main objective of this research is to investigate possible mechanisms that might influence water quality changes under seasonal conditions in shallow aquifers situated within the Saharan desert region of Algeria. In this work, we focus on observed changes in hydrogeochemical characteristics, and the possible responsible processes. Under arid conditions, high water mineralization results in hypersaline water or brine solution formation within shallow aquifers. Due to active physico-chemical mechanisms such as Na+/Ca2+ ion exchange, the successive precipitation of calcite, gypsum, mirabilite or blœdite and halite is induced. Biological processes were also observed as prevalent; evidenced by large measured variations in CO2 load concentrations. These processes contributed to an inverse relationship between CO2 and O2 concentrations within the shallow aquifers studied.

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