Cleaning and reusing backwash water of water treatment plants

Skolubovich, Yuri; Voytov, Evgeny; Skolubovich, Alexey; Ilina, L.

doi:10.1088/1755-1315/90/1/012035

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…The high effectiveness of modern filtration technologies is mainly related to the high capacity of materials used as filter beds, and therefore the necessity of their effective washing and thus the management of large amounts of washings [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Filtration Bed type in the Pool Water Treatment System on Washings Quality

Wyczarska-Kokot

Lempart

2019

Ecological Chemistry and Engineering S

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This paper presents the influence of the type of filtration beds, used in swimming pool water treatment systems, on the quality and the possibility of reuse of washings. The research covered 4 pool cycles with sand, sand and anthracite, glass and diatomaceous beds. The degree of contamination of washings was assessed on the basis of physical, chemical and bacteriological tests. The possibility of washings drainage into the natural environment was considered, and the results of the research were compared with the permissible values of pollution indicators for wastewater discharged to water or ground. A direct management of washings from the analysed filters proved impossible mainly due to the high content of TSS (total suspended solids) and free chlorine. Washings were subjected to sedimentation and then the supernatant was stirred intensively. As a result of these processes, the quality of washings was significantly improved. This allowed planning to supplement the pool water installations with systems for washings management.

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Section: Introductionmentioning

confidence: 99%

The Influence of the Filtration Bed type in the Pool Water Treatment System on Washings Quality

Wyczarska-Kokot

Lempart

2019

Ecological Chemistry and Engineering S

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“…Four types of new GAC produced by Chemviron Carbon were selected, previously developed by one of the co-authors of this article were used [42]. Equations ( 20)- (23) for backwash intensity as a function of water temperature and GAC bed expansion are presented in Table 9. Based on these equations and monthly average temperatures, the backwash intensity required to achieve bed expansion of 25% for the four selected GAC types during the year was calculated and is shown in Figure 8.…”

Section: Granulated Activated Carbonmentioning

confidence: 99%

“…The selection of the right backwash intensity depending on the average temperature of the water in the individual months of the year is important both for water and energy demand and for the quality of drinking water. In addition, reducing the amount of heavily contaminated wash water reduces the costs associated with the treatment of these waters and the treatment of the resulting sludge [21][22][23][24]. Proper adjusting of the backwash intensity is important for preventing media grain loss [25,26].…”

Section: Introductionmentioning

confidence: 99%

Energy and Water Savings during Backwashing of Rapid Filter Plants

Zielina

Dąbrowski

2021

Energies

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This paper describes an analysis of the effects of adjusting the intensity of filter backwash to the water temperature. The consequences of the lack of such adjustment for the life of filter beds, the amount of water used for backwashing, the amount of energy used for backwashing and the quality of the first filtrate are presented. In order to determine the losses and profits resulting from controlling the intensity of backwash water depending on its temperature, an analysis was carried out at a water treatment plant in southern Poland. Laboratory measurements were used to determine the granulation and specific gravity of sand grains filling the filtration beds. On the basis of measurements on a semi-technical scale, the magnitudes of filter bed expansion were determined for average monthly wash water temperatures. They were first calculated from the Richardson–Zaki equation, using different formulae for the value of the exponent of the power in this equation. Due to significant differences in the density and shape of grains covered with a permanent deposit after several years of filter operation, a satisfactory match between the formulae known from the literature and the results of expansion measurements was not obtained. Therefore, an new formula for the bed expansion was developed based on the Richardson–Zaki equation. A good fit of this formula to the experimental results was obtained. Monthly average values of water temperature were compiled, and on this basis the required amount of backwash water and energy was computed. The computations were made for 25% of fluidized bed expansion. Possible energy and water savings were estimated, as well as further gains from keeping the required expansion of the porous bed constant regardless of the wash water temperature.

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“…The primary objective of these studies is to recover water and utilize it for various urban purposes. [14][15][16][17] While there have been several investigations into the contamination of drinking water with heavy metals through various studies, there is a lack of research specifically focused on health risk assessments related to backwash recovered from WTPs. [18][19][20] The quantitative chemical risk assessment (QCRA), hazard quotient (HQ), accumulation index, hazard index (HI), and quantitative microbial risk assessment (QMRA) are the main risk assessment methodologies that can be used for drinking water.…”

Section: Introductionmentioning

confidence: 99%

Health Risk Assessment for Reused Backwash Water from Saveh Water Treatment Plant

Mahdavi,

Mahvi,

Mohebbi

et al. 2024

Journal of Advances in Environmental Health Research

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Background: The increase in population growth, industries and living standards have caused an increasing need for drinking water in many countries. The reuse of treated water and wastewater is one of the most important options to deal with water shortage. To ensure the correctness of this work, it is necessary that the health risk assessment be reassessed during use so that consumers do not face serious problems. In this regard, the assessment of health risks assessment for the water recovered from the backwashing wastewater of the Saveh water treatment plant was investigated. Methods: To reuse the backwash wastewater from the Saveh water treatment plant, the processes of primary sedimentation and coagulation (in the form of a test jar) were investigated. Metals and heavy metals like iron (Fe), aluminum (Al), lead (Pb), Arsenic (As) and cadmium (Cd) were examined to evaluate health risks. The initial settling time was 1 hour, the coagulant used was FeCl3 made in Iran, and heavy metal contents were also measured with an Inductively coupled plasma (ICP) device. Results: The value of HRIs for Al, Fe, As, Pb and Cd in the treated spent filter backwash water (SFBW) with primary sedimentation and coagulation was less than "1" and indicates the absence of risk. Conclusion: The treated backwash wastewater treated with primary sedimentation and coagulation processes as well as raw water of the Saveh have no harmful effects in terms of heavy metals, and its reuse will not pose a risk to the health of the consumer.

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Cleaning and reusing backwash water of water treatment plants

Cited by 4 publications

References 1 publication

The Influence of the Filtration Bed type in the Pool Water Treatment System on Washings Quality

The Influence of the Filtration Bed type in the Pool Water Treatment System on Washings Quality

Energy and Water Savings during Backwashing of Rapid Filter Plants

Health Risk Assessment for Reused Backwash Water from Saveh Water Treatment Plant

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