Graduation thesis covers the theorethical background of drainage and wastewater treatment
with emphasis on stormwater. Study provides analysis of the impact of the upgraded sewage
network and newly erected stormwater overflows and tanks on the effectiveness of the Central
wastewater treatment plant Škofja Loka. Operational monitoring's processed data for both old
and with tertiary treatment upgraded Central wastewater treatment plant Škofja Loka were
used. We have mainly focused on a couple of significant characteristics of wastewater
including BOD5, COD, suspended solids, phosphorus and nitrogen. By comparing the obtained
results of the cleaning efficiency of the old and the new treatment plant, the impact of the
modernization of the sewage network on the quality of discharge of the treated wastewater
during rainfall is evaluated.
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