Technical Journal, Vol. 15 No. 4, 2021.
Professional paper
https://doi.org/10.31803/tg-20210209155414
Preliminary Analysis of Load Input into the Accumulation Varaždin by Rain Overflow
Domagoj Nakić
orcid.org/0000-0003-1747-5451
; University North, Civil Engineering Department, 104. brigade 1, 42000 Varaždin, Croatia
Tanja Trabe Baranašić
; HEP proizvodnja d.o.o., Proizvodno područje HE Sjever, Međimurska 26C, 42000 Varaždin
Dražen Vouk
; University of Zagreb, Faculty of Civil Engineering, Kačićeva 26, 10000 Zagreb, Croatia
Bojan Đurin
orcid.org/0000-0002-2361-8036
; University North, Civil Engineering Department, 104. brigade 1, 42000 Varaždin, Croatia
Abstract
The wastewater treatment plant Varaždin upgrade project envisages the reconstruction of the rain overflow directly upstream of the plant. Physicochemical parameters of water quality (Biological Oxygen Demand, Chemical Oxygen Demand, Total Nitrogen, Total Phosphorus, Suspended Solids) in sewage/drainage system and in the accumulation were analyzed. In accordance with expected values of concentrations in overflow and in the accumulation, an analysis of the water quality in the accumulation after mixing was performed with certain assumptions. The results show that the ecological condition of the accumulation generally remains unchanged, classified as good condition, except for Chemical oxygen demand which is a critical parameter. Paper refers to the frequency and duration of possible exceedances of the Chemical oxygen demand limits and gives critical analysis of the realistically expected impacts. A proposal for conducting more detailed analysis with a larger database and by modelling pollution discharge by a complex three-dimensional model is given.
Keywords
accumulation Varaždin; agglomeration Varaždin; rain overflow; regulation on water quality standard; wastewater treatment plant
Hrčak ID:
265011
URI
Publication date:
1.11.2021.
Visits: 594 *