Use of water turbidity as an identifier of microbiological contamination in the risk assessment of water consumer health

Zimoch, Izabela; Paciej, J.

doi:10.5004/dwt.2020.26426

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…Turbidity of water is the expression of optical property in which the light is scattered by the particles present in the water. Clay, slit, organic matter, phytoplankton and other microscopic organisms cause turbidity in lake water (Zimoch and Paciej 2020). High turbidity shows presence of large number of suspended solids.…”

Section: Discussionmentioning

confidence: 99%

Assessment of drinking-water quality in the Dibamba watershed (Douala-Cameroon

H. Blaise Nguendo Yongsi

2024

Int. J. Sci. Res. Updates

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Background: Residents of Douala including Dibamba watershed collect water from various points to fulfill their freshwater needs. However, it is known that many microorganisms, including parasites, bacteria, viruses, and even alga, are present in water where they form a complex ecosystem. These microorganisms are held responsible for most of the contamination in drinking water and related diseases that threaten health of many individuals. Objectives: This study aims to determine the bacteriological and physicochemical quality of drinking water used by city dwellers in the Dibamba watershed. Methods: A cross-sectional study was conducted in different communities living in the watershed. A total of 58 drinking water samples were randomly collected from a variety of water resources. The analyses were performed for temperature, Ph, and conductivity; and for bacterial parameters, namely, to trace the presence of organisms and opportunistic pathogens indicative of fecal contamination. Results: Water used for consumption purposes have an acidic pH, low dissolved oxygen content, and shows high levels of microorganisms, testifying water pollution due to domestic wastewater discharged without any prior treatment, and coming from domestic, livestock and agricultural activities carried out in the watershed. These contaminated waters contain pathogenic species (Shigella, Salmonella, E.Coli, etc.) suspected of being the cause of waterborne infectious diseases in the watershed.. Conclusion: The results of our study show that 95% of tested drinking water samples are of low microbiological quality. They neither fulfill requirements of World Health Organization standards, nor fit for human consumption. Therefore, Decision-makers and Stake holders should implement practical actions to facilitate access to safe and sufficient drinking water in the watershed.

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Section: Discussionmentioning

confidence: 99%

Assessment of drinking-water quality in the Dibamba watershed (Douala-Cameroon

H. Blaise Nguendo Yongsi

2024

Int. J. Sci. Res. Updates

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“…CD, like ozone, reacts with organic substances in surface water as a result of which aldehydes are formed. Their presence in the water supply network is extremely undesirable due to the possibility of secondary growth of microorganisms present in running water and forming biofilms on the inner walls of distribution pipes, especially when the disinfectant remains disappear at the same time [22][23][24][25][26][27].…”

Section: Relevance Of Researchmentioning

confidence: 99%

Analysis of Applying Surface Water Treatment Technology When Using Chlorine Dioxide at Water Supply Plants

Mavrykin

2023

LRaWM

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The results of the conducted research made it possible to establish that in EU countries chlorine dioxide (CD) is more often used for secondary or final disinfection of drinking water. By-products of this process are chlorites and chlorates, which are subject to control in the drinking water of all EU countries. Aldehydes and carboxylic acids can also be formed in drinking water, which leads to a decrease in the microbiological stability of tap water. Ozonation and filtration using a carbon filter are used in the final stage of drinking water purification, which contributes to a significant reduction in the dose of CD and water contamination with toxic chlorites. In the case of pre-oxidation of water with sodium hypochlorite, the largest amount of chlorites and chlorates is formed, while in the case of using potassium permanganate for the same purpose, the need for CD and the amount of chlorites and chlorates in drinking water reduced. Chlorination of natural water that has undergone CD pre-oxidation leads to complete oxidation of the chlorites that have formed, increases the effectiveness of disinfection, and provides a bacteriostatic effect in the distribution network. During 2021-2022, when using CD for the treatment of drinking water at the Dniprovska WTP in Kyiv it was established that the process of treating natural water with CD is accompanied by the formation of its by-products, mainly toxic chlorites, the levels of which depend on the applied doses of CD and are the lowest in winter, while the largest ones are observed in summer and do not always reach regulatory values (0,2 mg/l) and range up to 0,7 mg/l, which corresponds to the WHO recommended standard for this substance in drinking water. Italian scientists focus their attention on the fact that during the first years of using CD at each water supply station, optimal conditions must be ensured for the safe and effective use of this reagent. Therefore, CD is becoming widespread in the EU countries and Ukraine for the treatment of tap drinking water; it is an alternative method of water effective disinfection at water supply stations with traditional surface water purification technology. Using such a method for treating surface water requires a preliminary pilot experiment and should be carried out along with an analysis of the feasibility of using the methods for preliminary and/or final purification of drinking water from organic substances and additional disinfection. Today, based on experimental and natural studies, it is relevant to expand knowledge about the properties of CD in the case of its use in drinking water supply for the treatment of surface water with a high content of organic substances.

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Impact of the modernized technology on the quality of water supplied to the extended distribution system of the city of Poznań

Lasocka-Gomuła

Świetlik

2022

Appl Water Sci

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The paper presents the results of a long-term study covering the development, implementation and operation of the second stage of water treatment (i.e. ozonation and subsequent granular active carbon (GAC) filtration) in the “Mosina” water treatment station supplying drinking water to the city of Poznań. The basis for the modernisation of the system was the high reactivity of the natural organic matter (NOM) present in the treated water with the disinfectant (in this case chlorine dioxide) resulting in an increased demand for ClO2 and reduced microbiological stability of the water. During the study it was shown that simple carboxylic acids are generated during ozonation and their presence can be an indicator of the microbiological stability of the treated water. However, these compounds are effectively removed from water during filtration through biologically active GAC filters. It was also shown that the best and cheapest parameter allowing to control water quality at individual stages of its treatment is UV absorbance, which shows reactive components of NOM removal efficiency in the technological sequence. The effectiveness of the modernisation of the technological system was evaluated on the basis of the disinfectant demand as well as on the basis of selected carboxylic acids concentration in the intake points on the water supply network fed with water from the WTS “Mosina”. At the last stage of the study, it was observed that the concentration of carboxylic acids in the distribution network was significantly reduced and stabilised, and a low dose of chlorine dioxide did not cause their re-formation. As a result of the modernisation, a new balance was achieved between the disinfectants used and the NOM compounds present in the treated water. Thus, the results confirmed that properly conducted pilot studies are a required element in planning of modernisation changes for water supply facilities.

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Use of water turbidity as an identifier of microbiological contamination in the risk assessment of water consumer health

Cited by 7 publications

References 27 publications

Assessment of drinking-water quality in the Dibamba watershed (Douala-Cameroon

Assessment of drinking-water quality in the Dibamba watershed (Douala-Cameroon

Analysis of Applying Surface Water Treatment Technology When Using Chlorine Dioxide at Water Supply Plants

Impact of the modernized technology on the quality of water supplied to the extended distribution system of the city of Poznań

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