Abstract
The paper presents characteristics of Debina infiltration intake which provides water for Poznan and neighbouring communes. The evaluation of effectiveness of infiltration process has been done based on the quality parameters of river water and infiltration water. The analysed water quality parameters are as follows: temperature, iron, manganese, DOCKMnO4, TOC, turbidity, colour, dissolved oxygen, free carbon dioxide, conductivity, total hardness, carbonate hardness, pH, heavy metals, detergents and microorganisms. The paper also includes an assessment of the impact of flood conditions on the quality of infiltration water and operation of infiltration intake. In this part of the paper the following parameters were taken into account: iron, manganese, DOCKMnO4, TOC, turbidity, colour, dissolved oxygen, free carbon dioxide, conductivity, total hardness, the total number of microorganisms in 36°C (mesophilic), the total number of microorganisms in 22°C (psychrophilic), coli bacteria, Clostridium perfringens, Escherichia coli, Enterococci. Analysis of the effects of flood on infiltration process leads to the following conclusions: the deterioration of infiltration water quality was due to the deterioration of river water quality, substantial shortening of groundwater passage and partial disappearance of the aeration zone. The observed deterioration of infiltration water quality did not affect the treated water quality, produced at water treatment plant.
Highlights
Infiltration intakes have more than hundred years of tradition [1]
In most cases technology is focused on the removal of excessive amounts of iron and manganese from the water and preventive disinfection, the infiltration process can be less effective and there are water treatment plants which use technology typical for surface water treatment, for example coagulation [2]
The DOCKMnO4 of infiltration water decreases more than twice comparing to the DOCKMnO4 of the Warta River water and achieves quality requirements regarding the water intended for consumption, defined at 5 mgO2/dm3
Summary
Infiltration intakes have more than hundred years of tradition [1]. Their implementation were strictly related to decrease of groundwater resources [2]. Considering that most of infiltration intakes were created as a result of the development of groundwater intakes, these adjustments in the treatment technology has eliminated a need to build the new water treatment plants, technologically adapted for surface water treatment. The research presented in this paper is focused on artificial infiltration In this process water from infiltration ponds goes through a four stage purification process. Flowing through the membrane and ground layer at the bottom of the pond, water is purified by mechanical filtration, ion exchange, adsorption and biological processes. In this phase the most of heterogeneous impurities are stopped. Presented analyses refer to changes in water quality occurring in Debina intake in Poznan
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