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Dr. Anna Młyńska
Department of Water Supply, Sewerage and Environmental Monitoring, Cracow University of Technology

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0 Renovation
0 Water
0 Water Supply
0 water pipe networks
0 sewage treatment

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Water Supply
sewage treatment

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Journal article
Published: 03 March 2021 in Journal of Water Supply: Research and Technology-Aqua
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Among the many factors affecting water supply system failures are the weather conditions that change over the year. Since this is an important research issue, as part of this study, investigation of water supply system failure seasonality by the selected statistical approaches was presented. The basis of the research was monthly number of the pipelines' failures from the multi-year period of 2007–2017 of the municipal water network located in southern Poland. Mann–Kendall test results proved decreasing seasonal trend of the failure rate indexes λ. In turn, the results of the Colwell indexes' calculations allowed it to be stated that seasonal course of the water pipelines' failure events can be relatively easy to predict. As it turned out, it is difficult to determine unambiguously the impact of a given period of the year on the water pipeline failure events' occurrence. However, greater failure-free operation of the water pipelines may be expected in spring and summer months than in autumn and winter months. Because using Colwell indexes for seasonality analysis has no limitations compared to other methods, Colwell indexes may be considered as reliable tools for the assessment of the seasonal course of the water pipelines' failure events.

ACS Style

Dariusz Młyński; Tomasz Bergel; Anna Młyńska; Kazimierz Kudlik. A study of the water supply system failure in terms of the seasonality: analysis by statistical approaches. Journal of Water Supply: Research and Technology-Aqua 2021, 70, 289 -302.

AMA Style

Dariusz Młyński, Tomasz Bergel, Anna Młyńska, Kazimierz Kudlik. A study of the water supply system failure in terms of the seasonality: analysis by statistical approaches. Journal of Water Supply: Research and Technology-Aqua. 2021; 70 (3):289-302.

Chicago/Turabian Style

Dariusz Młyński; Tomasz Bergel; Anna Młyńska; Kazimierz Kudlik. 2021. "A study of the water supply system failure in terms of the seasonality: analysis by statistical approaches." Journal of Water Supply: Research and Technology-Aqua 70, no. 3: 289-302.

Journal article
Published: 01 March 2021 in Journal of Ecological Engineering
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ACS Style

Tomasz Bergel; Anna Młyńska. Analysis of the Impact of the Air Temperature on Water Consumption for Household Purposes in Rural Households. Journal of Ecological Engineering 2021, 22, 289 -302.

AMA Style

Tomasz Bergel, Anna Młyńska. Analysis of the Impact of the Air Temperature on Water Consumption for Household Purposes in Rural Households. Journal of Ecological Engineering. 2021; 22 (3):289-302.

Chicago/Turabian Style

Tomasz Bergel; Anna Młyńska. 2021. "Analysis of the Impact of the Air Temperature on Water Consumption for Household Purposes in Rural Households." Journal of Ecological Engineering 22, no. 3: 289-302.

Journal article
Published: 16 December 2020 in Sustainability
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The paper presents modelling of wastewater treatment plant (WWTP) operation work efficiency using a two-stage method based on selected probability distributions and the Monte Carlo method. Calculations were carried out in terms of sewage susceptibility to biodegradability. Pollutant indicators in raw sewage and in sewage after mechanical treatment and biological treatment were analysed: BOD5, COD, total suspended solids (TSS), total nitrogen (TN) and total phosphorus (TP). The compatibility of theoretical and empirical distributions was assessed using the Anderson–Darling test. The best-fitted statistical distributions were selected using Akaike criterion. Performed calculations made it possible to state that out of all proposed methods, the Gaussian mixture model (GMM) for distribution proved to be the best-fitted. Obtained simulation results proved that the statistical tools used in this paper describe the changes of pollutant indicators correctly. The calculations allowed us to state that the proposed calculation method can be an effective tool for predicting the course of subsequent sewage treatment stages. Modelling results can be used to make a reliable assessment of sewage susceptibility to biodegradability expressed by the BOD5/COD, BOD5/TN and BOD5/TP ratios. New data generated this way can be helpful for the assessment of WWTP operation work and for preparing different possible scenarios for their operation.

ACS Style

Dariusz Młyński; Anna Młyńska; Krzysztof Chmielowski; Jan Pawełek. Investigation of the Wastewater Treatment Plant Processes Efficiency Using Statistical Tools. Sustainability 2020, 12, 10522 .

AMA Style

Dariusz Młyński, Anna Młyńska, Krzysztof Chmielowski, Jan Pawełek. Investigation of the Wastewater Treatment Plant Processes Efficiency Using Statistical Tools. Sustainability. 2020; 12 (24):10522.

Chicago/Turabian Style

Dariusz Młyński; Anna Młyńska; Krzysztof Chmielowski; Jan Pawełek. 2020. "Investigation of the Wastewater Treatment Plant Processes Efficiency Using Statistical Tools." Sustainability 12, no. 24: 10522.

Research article
Published: 04 May 2019 in SN Applied Sciences
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The quality of water transported through freshly cemented water pipes depends not only on the type of cement used. The other factor affecting the degree of leaching pollutants from cement coatings is the chemical parameters of the water. A disinfection process is necessary for maintaining water which is safe for human health and high quality. However, simultaneously, the presence of disinfectant in water may cause some problems. The results of the experiments performed showed that independently of the concentration of sodium hypochlorite in water, rapid changes of water pH soon after cement mortar lining renovation may always be expected. The addition of disinfectant to water causes an increase in pollutants leaching from cement coatings, even in the case of a low disinfectant dose. Although the concentration of disinfectant in water has a differential impact on the degree of pollutants leaching from cement coatings, the increase in the leaching of the pollutants is not proportional to the disinfectant concentration.

ACS Style

Anna Młyńska; Michał Zielina; Andrzej Bielski. Contamination of drinking water soon after cement mortar lining renovation depending on the disinfectant doses. SN Applied Sciences 2019, 1, 516 .

AMA Style

Anna Młyńska, Michał Zielina, Andrzej Bielski. Contamination of drinking water soon after cement mortar lining renovation depending on the disinfectant doses. SN Applied Sciences. 2019; 1 (6):516.

Chicago/Turabian Style

Anna Młyńska; Michał Zielina; Andrzej Bielski. 2019. "Contamination of drinking water soon after cement mortar lining renovation depending on the disinfectant doses." SN Applied Sciences 1, no. 6: 516.

Journal article
Published: 26 April 2019 in Water
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The aim of the present work was the modeling of the wastewater treatment plant operation work using Monte Carlo method and different random variables probability distributions modeling. The analysis includes the following pollutants indicators; BOD5 (Biochemical Oxygen Demand), CODCr (Chemical Oxygen Demand), Total Suspended Solids (SSt), Total Nitrogen (TN), and Total Phosphorus (TP). The Anderson–Darling (A–D) test was used for the assessment of theoretical and empirical distributions compatibility. The selection of the best-fitting statistical distributions was performed using peak-weighted root mean square (PWRMSE) parameter. Based on the performed calculations, it was stated that pollutants indicators in treated sewage were characterized by a significant variability. Obtained results indicate that the best-fitting pollutants indicators statistical distribution is Gauss Mixed Model (GMM) function. The results of the Monte Carlo simulation method confirmed that some problems related to the organic and biogenic pollutants reduction may be observed in the Wastewater Treatment Plant, in Jaworzno.

ACS Style

Dariusz Młyński; Piotr Bugajski; Anna Młyńska. Application of the Mathematical Simulation Methods for the Assessment of the Wastewater Treatment Plant Operation Work Reliability. Water 2019, 11, 873 .

AMA Style

Dariusz Młyński, Piotr Bugajski, Anna Młyńska. Application of the Mathematical Simulation Methods for the Assessment of the Wastewater Treatment Plant Operation Work Reliability. Water. 2019; 11 (5):873.

Chicago/Turabian Style

Dariusz Młyński; Piotr Bugajski; Anna Młyńska. 2019. "Application of the Mathematical Simulation Methods for the Assessment of the Wastewater Treatment Plant Operation Work Reliability." Water 11, no. 5: 873.

Research article
Published: 25 February 2019 in CLEAN – Soil, Air, Water
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Despite the fact that water pipes renovation using cement coatings has many advantages, directly after its application, the quality of the transported water may deteriorate. This is mainly due to the dissolution and leaching of some chemical elements from the protective coatings into the water. The necessity of meeting drinking water quality requirements enforces the provision of an appropriate flushing time of the freshly cemented water pipes before their return to re‐use and adjusting the length of the once‐renovated pipe. In this paper, the comparison and verification of pollutants leaching from cement mortar coatings in static and dynamic conditions was performed. Based on the experimental research performed under laboratory conditions, the curves describing the dependence of leaching pollutants from the cement mortar coating on the diameter and length of the freshly cemented water pipe were elaborated. Leaching graphs allow for forecasting some drinking water quality parameters changes soon after the water main renovation. The performed calculations for the freshly cemented transit pipeline connecting the intake of drinking water from the Dobczyce Reservoir to Cracow City have shown that the risk of exceeding the limitation values for aluminium, chromium and lead concentration in water at the end of the renovated pipeline is very small for the commonly used in renovations type of cement – CEM I.

ACS Style

Anna Młyńska; Michal Zielina. Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments. CLEAN – Soil, Air, Water 2019, 47, 1 .

AMA Style

Anna Młyńska, Michal Zielina. Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments. CLEAN – Soil, Air, Water. 2019; 47 (4):1.

Chicago/Turabian Style

Anna Młyńska; Michal Zielina. 2019. "Estimation of Pollutants Leaching from Cement Coating to Water After Pipe Renovation Based on Laboratory Experiments." CLEAN – Soil, Air, Water 47, no. 4: 1.

Journal article
Published: 22 October 2018 in Journal of Water Supply: Research and Technology-Aqua
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Obtained EDS and ICP elemental analyses results showed some small differences between the compositions of two of the most common Portland cements, CEM I types, used for water pipe renovation. An evident link between the cements' composition and total amounts of leached elements from tested cement coatings was observed. The performed experiments confirmed that the greatest risk of water contamination soon after pipe renovation by cement mortar lining is related to aluminium leaching. As it turns out, the degree of aluminium leaching from cements produced by two different manufacturers is indicated to be very similar, in comparison to the leaching of calcium compounds and some trace elements. In both cases, the pollutants leaching from the cement coatings into water is most intensive in the initial period of contact and decreases over time. Despite some differences between the calculated concentrations of chemical elements in water, especially lead and chromium, in most cases, their estimated concentrations at the outflow from freshly renovated pipelines cemented with different Portland cements CEM I types and for different pipe diameters, lengths and water flow velocities were much lower than the maximum permissible levels in drinking water.

ACS Style

Anna Młyńska; Michal Zielina. A comparative study of portland cements CEM I used for water pipe renovation in terms of pollutants leaching from cement coatings and their impact on water quality. Journal of Water Supply: Research and Technology-Aqua 2018, 67, 685 -696.

AMA Style

Anna Młyńska, Michal Zielina. A comparative study of portland cements CEM I used for water pipe renovation in terms of pollutants leaching from cement coatings and their impact on water quality. Journal of Water Supply: Research and Technology-Aqua. 2018; 67 (7):685-696.

Chicago/Turabian Style

Anna Młyńska; Michal Zielina. 2018. "A comparative study of portland cements CEM I used for water pipe renovation in terms of pollutants leaching from cement coatings and their impact on water quality." Journal of Water Supply: Research and Technology-Aqua 67, no. 7: 685-696.

Journal article
Published: 01 October 2017 in Inżynieria Ekologiczna
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ACS Style

Anna Młyńska; Krzysztof Chmielowski; Dariusz Młyński. The analysis of the sewage changes quality during treatment processes on the wastewater treatment plant in Przemyśl. Inżynieria Ekologiczna 2017, 18, 18 -26.

AMA Style

Anna Młyńska, Krzysztof Chmielowski, Dariusz Młyński. The analysis of the sewage changes quality during treatment processes on the wastewater treatment plant in Przemyśl. Inżynieria Ekologiczna. 2017; 18 (5):18-26.

Chicago/Turabian Style

Anna Młyńska; Krzysztof Chmielowski; Dariusz Młyński. 2017. "The analysis of the sewage changes quality during treatment processes on the wastewater treatment plant in Przemyśl." Inżynieria Ekologiczna 18, no. 5: 18-26.

Journal article
Published: 01 June 2017 in Inżynieria Ekologiczna
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ACS Style

Dariusz Młyński; Anna Młyńska; Krzysztof Chmielowski. THE ANALYSIS OF THE SEWAGE QUANTITY DISCHARGING FROM THE SEWERAGE AGGLOMERATION IN SANOK. Inżynieria Ekologiczna 2017, 18, 202 -209.

AMA Style

Dariusz Młyński, Anna Młyńska, Krzysztof Chmielowski. THE ANALYSIS OF THE SEWAGE QUANTITY DISCHARGING FROM THE SEWERAGE AGGLOMERATION IN SANOK. Inżynieria Ekologiczna. 2017; 18 (3):202-209.

Chicago/Turabian Style

Dariusz Młyński; Anna Młyńska; Krzysztof Chmielowski. 2017. "THE ANALYSIS OF THE SEWAGE QUANTITY DISCHARGING FROM THE SEWERAGE AGGLOMERATION IN SANOK." Inżynieria Ekologiczna 18, no. 3: 202-209.

Conference paper
Published: 24 May 2017 in E3S Web of Conferences
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Nowadays, cement coatings are often used as an anticorrosion protection of the internal surfaces of manufactured ductile iron water pipes. The protective cement linings are also commonly used for old water pipe renovation. In both cases, the cement lining is an excellent anticorrosion protection of the pipelines, effectively separating the pipe wall from the flowing water. Moreover, cement linings protect the pipelines not only by a mechanical barrier, but also by a chemical barrier creating a highly alkaline environment in water contact with the metal pipe wall. In addition, cement coatings have an ability for so-called self-regeneration and provide the improvement of hydraulic conditions inside the pipelines. In turn, the differences between the analysed cement coatings mainly depend on the types of cements used and techniques of cement mortar spraying. As was expected, they influence the quality of water having contact with the coating. A comparison of the impact of cement coatings manufactured in factories and sprayed on building sites during the renovation on drinking water quality parameters was performed in the study. The experiments were conducted in laboratory conditions, using the test stands prepared for this purpose. The results include analysis of selected water quality parameters for the samples contacting with cement mortar and collected during the investigation.

ACS Style

Anna Młyńska; Michał Zielina. The influence of prefabricated pipe cement coatings and those made during pipe renovation on drinking water quality. E3S Web of Conferences 2017, 17, 61 .

AMA Style

Anna Młyńska, Michał Zielina. The influence of prefabricated pipe cement coatings and those made during pipe renovation on drinking water quality. E3S Web of Conferences. 2017; 17 ():61.

Chicago/Turabian Style

Anna Młyńska; Michał Zielina. 2017. "The influence of prefabricated pipe cement coatings and those made during pipe renovation on drinking water quality." E3S Web of Conferences 17, no. : 61.

Journal article
Published: 01 January 2017 in Journal of Civil Engineering, Environment and Architecture
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ACS Style

Anna Młyńska; Krzysztof Chmielowski; Dariusz Młyński. REDUKCJA ZWIĄZKÓW BIOGENNYCH NA WYBRANYCH OCZYSZCZALNIACH ŚCIEKÓW WOJEWÓDZTWA PODKARPACKIEGO Z UWZGLĘDNIENIEM WARUNKÓW POGODY SUCHEJ I MOKREJ. Journal of Civil Engineering, Environment and Architecture 2017, 1 .

AMA Style

Anna Młyńska, Krzysztof Chmielowski, Dariusz Młyński. REDUKCJA ZWIĄZKÓW BIOGENNYCH NA WYBRANYCH OCZYSZCZALNIACH ŚCIEKÓW WOJEWÓDZTWA PODKARPACKIEGO Z UWZGLĘDNIENIEM WARUNKÓW POGODY SUCHEJ I MOKREJ. Journal of Civil Engineering, Environment and Architecture. 2017; ():1.

Chicago/Turabian Style

Anna Młyńska; Krzysztof Chmielowski; Dariusz Młyński. 2017. "REDUKCJA ZWIĄZKÓW BIOGENNYCH NA WYBRANYCH OCZYSZCZALNIACH ŚCIEKÓW WOJEWÓDZTWA PODKARPACKIEGO Z UWZGLĘDNIENIEM WARUNKÓW POGODY SUCHEJ I MOKREJ." Journal of Civil Engineering, Environment and Architecture , no. : 1.

Journal article
Published: 01 January 2017 in Acta Scientiarum Polonorum Formatio Circumiectus
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ACS Style

Dariusz Młyński; Krzysztof Chmielowski; Anna Młyńska; Uniwersytet Rolniczy W Krakowie; Politechnika Krakowska. THE ANALYSIS OF THE QUANTITY VARIABILITY OF THE SEWAGE INFLOWING TO THE SELECTED WASTEWATER TREATMENT PLANTS OF SANOK DISTRICT. Acta Scientiarum Polonorum Formatio Circumiectus 2017, 1, 77 -90.

AMA Style

Dariusz Młyński, Krzysztof Chmielowski, Anna Młyńska, Uniwersytet Rolniczy W Krakowie, Politechnika Krakowska. THE ANALYSIS OF THE QUANTITY VARIABILITY OF THE SEWAGE INFLOWING TO THE SELECTED WASTEWATER TREATMENT PLANTS OF SANOK DISTRICT. Acta Scientiarum Polonorum Formatio Circumiectus. 2017; 1 ():77-90.

Chicago/Turabian Style

Dariusz Młyński; Krzysztof Chmielowski; Anna Młyńska; Uniwersytet Rolniczy W Krakowie; Politechnika Krakowska. 2017. "THE ANALYSIS OF THE QUANTITY VARIABILITY OF THE SEWAGE INFLOWING TO THE SELECTED WASTEWATER TREATMENT PLANTS OF SANOK DISTRICT." Acta Scientiarum Polonorum Formatio Circumiectus 1, no. : 77-90.

Journal article
Published: 01 March 2016 in Journal of Water and Land Development
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The paper presents an analysis of hydraulic load in a wastewater treatment plant (WTP) in Jasło. The study was based on the records of daily sewage volume entering the treatment plant within a multi-year period of 2010–2014. The analysis took into account the average daily amount of incoming sewage, the maximum daily peaking factor for the incoming sewage, changes in the sewage volume depending on specific month and day of a week, and class intervals with the greatest frequency of occurrence. The analysis revealed that the average daily volume of the sewage entering the WTP in Jasło in the investigated multi-year period was 13 045 m3·d−1. The amount of incoming sewage was variable, as evidenced by the maximum peaking factors of daily sewage inflow that ranged from 1.07 to 2.78, depending on a specific month. The sewage admission was the largest in March, May and June and on Saturdays. Sewage volume interval most often occurring at the WTP in Jasło was the one between 8 000 and 10 000 m3·d−1. The study results indicated that the facility was hydraulically underloaded.

ACS Style

Dariusz Młyński; Krzysztof Chmielowski; Anna Młyńska. Analysis of hydraulic load of a wastewater treatment plant in Jasło. Journal of Water and Land Development 2016, 28, 61 -67.

AMA Style

Dariusz Młyński, Krzysztof Chmielowski, Anna Młyńska. Analysis of hydraulic load of a wastewater treatment plant in Jasło. Journal of Water and Land Development. 2016; 28 (1):61-67.

Chicago/Turabian Style

Dariusz Młyński; Krzysztof Chmielowski; Anna Młyńska. 2016. "Analysis of hydraulic load of a wastewater treatment plant in Jasło." Journal of Water and Land Development 28, no. 1: 61-67.

Journal article
Published: 01 January 2016 in Inżynieria Ekologiczna
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ACS Style

Dariusz Młyński; Krzysztof Chmielowski; Anna Młyńska. THE ASSESMENT OF THE EFFICENCY AND STABILITY OF WORK SEWAGE TREATMENT PLANT IN ZABAJKA. Inżynieria Ekologiczna 2016, 123 -130.

AMA Style

Dariusz Młyński, Krzysztof Chmielowski, Anna Młyńska. THE ASSESMENT OF THE EFFICENCY AND STABILITY OF WORK SEWAGE TREATMENT PLANT IN ZABAJKA. Inżynieria Ekologiczna. 2016; (47):123-130.

Chicago/Turabian Style

Dariusz Młyński; Krzysztof Chmielowski; Anna Młyńska. 2016. "THE ASSESMENT OF THE EFFICENCY AND STABILITY OF WORK SEWAGE TREATMENT PLANT IN ZABAJKA." Inżynieria Ekologiczna , no. 47: 123-130.

Journal article
Published: 01 January 2015 in Inżynieria Ekologiczna
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ACS Style

Krzysztof Chmielowski; Anna Młyńska; Dariusz Młyński. OPERATIONAL EFFICIENCY OF WASTEWATER TREATMENT PLANT IN KOLACZYCE. Inżynieria Ekologiczna 2015, 44 -50.

AMA Style

Krzysztof Chmielowski, Anna Młyńska, Dariusz Młyński. OPERATIONAL EFFICIENCY OF WASTEWATER TREATMENT PLANT IN KOLACZYCE. Inżynieria Ekologiczna. 2015; (45):44-50.

Chicago/Turabian Style

Krzysztof Chmielowski; Anna Młyńska; Dariusz Młyński. 2015. "OPERATIONAL EFFICIENCY OF WASTEWATER TREATMENT PLANT IN KOLACZYCE." Inżynieria Ekologiczna , no. 45: 44-50.