Evaluation of the surface-water sampling design in the Western Lake Michigan Drainages in relation to environmental factors affecting water quality at base flow

Ozone dosage in most water treatment plants is operated by determining the ozone concentration with the experience of the operation. In this case, it is not economical. This study selected the factors affecting residual ozone concentration and attempted to estimate the optimum amount of hydrogen peroxide dosage for the control of the residual ozone concentration by developing a model for the prediction of the residual ozone concentration. The prediction formulas developed in this study can quickly respond to the environment of water quality and surrounding environmental factors, which change in real time, so it is judged that they could be used for the operation of the optimum ozone process, and the control of ozone dosage could be used as a new method in controlling the concentration of ozone dosage and the concentration of residual ozone.

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Summary of biological investigations relating to water quality in the Western Lake Michigan Drainages, Wisconsin and Michigan

10.3133/wri964263 ◽

1996 ◽

Keyword(s):

Water Quality ◽

Lake Michigan ◽

Western Lake

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Risk Assessment for the Selected Surface Water Intake

Journal of Konbin ◽

10.2478/jok-2020-0079 ◽

2020 ◽

Vol 50 (4) ◽

pp. 147-163

Author(s):

Dawid Szpak ◽

Janusz R. Rak ◽

Krzysztof Boryczko ◽

Izabela Piegdoń ◽

Jakub Żywiec

Keyword(s):

Water Quality ◽

Risk Assessment ◽

Drinking Water ◽

Surface Water ◽

Water Intake ◽

Security Measures ◽

Efficient System ◽

Factors Affecting ◽

Risk Definition ◽

Water Supply Company

AbstractThe purpose of the work is to analyze the risk for surface water intake, taking into account factors affecting the water quality. A three-parameter risk definition was proposed. It was found that the analyzed water intake has an efficient system that protects consumers against drinking water of inadequate quality (multibarier system). The task of the water supply company is to maintain its security measures (including a caution and warning station, biomonitoring) in a state of efficiency.

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Pollution Situation of Water Environment and Characteristics of Dissolved Oxygen of Yang River

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1092-1093.892 ◽

2015 ◽

Vol 1092-1093 ◽

pp. 892-896

Author(s):

Nan Li ◽

Quan Wei Wei ◽

Yi Hong Wu ◽

Zai Feng Tian ◽

Hong Bo Li ◽

...

Keyword(s):

Water Quality ◽

Surface Water ◽

Dissolved Oxygen ◽

Water Environment ◽

Monitoring Data ◽

Water Safety ◽

River Flows ◽

Factors Affecting ◽

Guanting Reservoir ◽

Fourth Class

No.8 Bridge is the site where Yang River flows into Guanting Reservoir. It’s an important guarantee for the water safety of Guanting Reservoir that the water quality meets the standards steadily at No.8 Bridge. Based on the monitoring data from 2006 to 2013, the interannual and annual trends and correlations among DO, NH3-N and COD of Yang River were analyzed. The factors affecting DO were also discussed. The results showed that DO and COD met the fourth-class standard for surface water. NH3-N decreased year by year and its standard-reaching rate ran up to 70% since 2009. DO and COD, NH3-N was negatively correlated, but not significant, indicating that COD and NH3-N were not important factors affecting DO. DO varied along with seasons, autumn (mean 7.47mg /L) > spring (mean 7.35mg /L) > winter (mean 6.95mg /L) > summer (mean 6.35mg /L). Temperature is an important factor affecting DO. The possible impact on water environment of Guanting Reservoir caused by DO decrease should be paid special attention.

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The impact of anthropogenic and environmental factors on the variability of Escherichia coli in rivers in southwest Bangladesh

10.21203/rs.3.rs-901563/v1 ◽

2021 ◽

Author(s):

M. M. Majedul Islam ◽

Md. Atikul Islam

Keyword(s):

Escherichia Coli ◽

Water Quality ◽

Surface Water ◽

Environmental Factors ◽

Physicochemical Parameters ◽

Sewage Treatment Plant ◽

Oxygen Demand ◽

Faecal Contamination ◽

E Coli ◽

The Impact

Abstract Faecal contamination of surface water sources is an important water quality issue worldwide. Although quite a few studies exist on surface water faecal contamination and variability of indicator bacteria, most of the studies have been based on larger river basins and in temperate region. The variability is relatively unknown in local scale and in tropical developing countries. In this study we assess how anthropogenic and environmental factors affect faecal contamination and physicochemical parameters in Rupsha and Bhairab rivers around Khulna city, Bangladesh. Water samples were collected from six locations of the rivers during a wet and dry period in 2018 to measure Escherichia coli (E. coli) concentrations. Water physicochemical parameters—temperature, turbidity, pH, dissolved oxygen, biochemical oxygen demand and chemical oxygen demand were also measured. Higher concentrations of E. coli were found in the sampling sites located near the densely populated urban area compared to the downstream site, which receives fewer amounts of discharges from sewer drains. All the E. coli samples violated bathing water quality standards. E. coli concentrations were found to be correlated positively with precipitation and turbidity. A linear regression model was applied, that explains large part of the variation in E. coli concentration (R2 = 0.42). Water quality index assessment was also ranked the water quality as ‘poor’ category; indicate that the water is unsuitable for uses in domestic and recreational purposes and high health risks involved with the water use. The study findings highlight the problem of untreated sewage discharge into the rivers. Implementation of sewage treatment plant with adequate capacity is highly recommended.

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