Abstract
The study determines the impact of precipitation on the amount of wastewater flowing into the treatment plant in Nowy Targ. The research period covered the years 2016 and 2017, in which the amount of precipitation and average daily wastewater inflows (during the so-called dry period, i.e. days without precipitation and in the so-called wet period, i.e. days with precipitation) were analyzed. The research period was divided into 5 characteristic ranges in terms of the amount of precipitation. It was found that on days with different intensity of precipitation, the amount of rainwater (in the total amount of wastewater flowing into the treatment plant) ranges from 14.2% to 32.5%. Taking into account the absolute values, it was found that the average daily amount of wastewater inflow on days with precipitation was from 14361 to 18248 m3∙d-1 compared to wastewater inflow on days without precipitation (12323 m3∙d-1). The obtained test results should be a signal for sewage network operators for the performance of intensive and effective actions aimed at eliminating illegal connections of drain pipe for rainwater and yard drains to sanitary collectors and the replacement combined sewer system to distribution sewer system in the city of Nowy Targ.
Highlights
One of the basic issues of the proper functioning of a sewage treatment plant is the correct exploitation of the sewage network [1,2]
The purpose of the study was to determine the impact of precipitation in the sewage system in Nowy Targ on the amount of wastewater flowing into the treatment plant
The conducted research concerning the impact of precipitation on the amount of wastewater generated in the sewage system in Nowy Targ confirmed that extraneous waters, entering the sewage system during precipitation, constitute a significant share of the total amount of wastewater flowing into the treatment plant
Summary
One of the basic issues of the proper functioning of a sewage treatment plant is the correct exploitation of the sewage network [1,2]. Inflows of other types of wastewater to the sewage system than domestic wastewater negatively affect the mechanical and biological processes occurring in the technological process of the treatment plant [3,4]. One of the common situations is the phenomenon of illegal discharge of rainwater into sanitary sewage systems [5]. The increased amount of wastewater increases the costs of wastewater treatment. For environmental reasons, this affects the inability to supply groundwater with rainwater in the drainage basin – their level decreases [6]. The publication is a contribution to the discussion regarding counteracting the common phenomenon of illegal connection of drain pipe for rainwater to sanitary sewage systems
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