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Article

The Influence of Rainwater and Snowmelt (Inflow and Infiltration) on the Performance of Wastewater Treatment in a Plant Using Membrane Bioreactors (MBR)

1
Department of Sanitary Engineering and Water Management, Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Kraków, 24/28 Mickiewicza Str., 30-059 Kraków, Poland
2
Department of Environmental Technologies, Faculty of Environmental Engineering and Energy, Cracow University of Technology, 24 Warszawska Str., 31-155 Kraków, Poland
3
Miejski Zakład Wodociągów i Kanalizacji w Nowym Targu, Ul. Długa 21, 34-400 Nowy Targ, Poland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2025, 15(19), 10608; https://doi.org/10.3390/app151910608
Submission received: 25 August 2025 / Revised: 17 September 2025 / Accepted: 29 September 2025 / Published: 30 September 2025
(This article belongs to the Special Issue Water Pollution and Wastewater Treatment Chemistry)

Abstract

This article presents an analysis of wastewater inflow to a treatment plant and the impact of incidental (stormwater) inflow on the variability of its volume and quality. The study was conducted over a four-year period and showed that the average daily inflow of wastewater was 1133.2 m3 per day, which accounted for 56.7% of the plant’s design capacity. The variability of wastewater inflow was found to be significant, with stormwater having a considerable effect on increasing the volume of wastewater, especially during days with intense rainfall. Depending on precipitation levels, incidental water contributed between 12.2% and 46.2% of the total wastewater inflow. The analysis of the influent wastewater quality indicated a high variability in the concentrations of key pollution indicators. Despite this, the treatment processes in the membrane bioreactors (MBR) proved effective, consistently maintaining pollutant concentrations in the effluent below permissible limits. The conclusions highlight the necessity of considering stormwater in the design and operation of wastewater treatment plants to ensure their effective performance.
Keywords: membrane bioreactors (MBR); incidental water (stormwater); treatment efficiency membrane bioreactors (MBR); incidental water (stormwater); treatment efficiency

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MDPI and ACS Style

Bugajski, P.; Mucha, Z.; Kois, B. The Influence of Rainwater and Snowmelt (Inflow and Infiltration) on the Performance of Wastewater Treatment in a Plant Using Membrane Bioreactors (MBR). Appl. Sci. 2025, 15, 10608. https://doi.org/10.3390/app151910608

AMA Style

Bugajski P, Mucha Z, Kois B. The Influence of Rainwater and Snowmelt (Inflow and Infiltration) on the Performance of Wastewater Treatment in a Plant Using Membrane Bioreactors (MBR). Applied Sciences. 2025; 15(19):10608. https://doi.org/10.3390/app151910608

Chicago/Turabian Style

Bugajski, Piotr, Zbigniew Mucha, and Bartłomiej Kois. 2025. "The Influence of Rainwater and Snowmelt (Inflow and Infiltration) on the Performance of Wastewater Treatment in a Plant Using Membrane Bioreactors (MBR)" Applied Sciences 15, no. 19: 10608. https://doi.org/10.3390/app151910608

APA Style

Bugajski, P., Mucha, Z., & Kois, B. (2025). The Influence of Rainwater and Snowmelt (Inflow and Infiltration) on the Performance of Wastewater Treatment in a Plant Using Membrane Bioreactors (MBR). Applied Sciences, 15(19), 10608. https://doi.org/10.3390/app151910608

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