Uvedkommende vand i Grindsted: Undersøgelse af uvedkommende vands betydning for separate kloaksystemer
Oversat titel
Extraneous water in Grindsted: Examination of the significance of extraneous water for separate sewer systems
Forfatter
Semester
7. semester
Uddannelse
Udgivelsesår
2019
Afleveret
2019-01-17
Antal sider
101
Abstract
Det følgende diplomafgangsprojekt omhandler uvedkommende vand i kloaksystemer. Projektet er to-delt og består af et litteraturstudie og et databehandlingafsnit. Derudover indeholder projektet et bilags-afsnit. I litteraturstudiet er det fundet, at uvedkommende vand er et væsentligt problem i flere forsyninger rundt om i Danmark. Af de undersøgte forsyninger udgør uvedkommende vand fra 24\% op til 65\% af årsmængden på rensningsanlæggene. Hovedårsagen til uvedkommende vand er indsivning, men også fejlkoblinger i separate kloaksystemer kan give anledning til en væsentlig andel af det uvedkommende vand. Forsyningerne erfarer, at 2\% til 10\% af alle separatkloakerede ejendomme er behæftet med fejl. Igennem databehandlingsafsnittet er det fundet, at uvedkommende vand i Grindsted, Aalborg Kommune, udgør mellem 46\% og 64\% af de totale pumpede mængder for årene 2015-2018. I forbindelse med dimensionering af det nye spildevandssystem til byen er det fundet, at fejlkoblinger kan få stor betydning for spildevandssystemets kapacitet. Samtidig viser undersøgelsen, at selv små fejlkoblingsandele kan forbedre systemets selvrensningsevne betydeligt. Derfor er det vurderet, at fejlkoblingsandelene bør holdes på et minimum, men at lidt uvedkommende vand i systemet kan forbedre visse driftbetingelser.
The following diploma exit project deals with extraneous water in sewer systems. The project is two-part and consists of a literature study and a data processing section. In addition, the project contains an annex section. In the literature study, it has been found that extraneous water is a major problem in several supplies around Denmark. Of the supplies examined, extraneous water accounts for 24% up to 65% of the annual. The main reason for extraneous water is seepage, but also mismatches in separate sewer systems can give rise to a significant proportion of the unauthorized water. The supplies find that 2% to 10% of all separate sewered properties are mismatched. Through the data processing section, it has been found that extraneous water in Grindsted, Aalborg Municipality, constitutes for between 46% and 64% of the total pumped volumes for the years 2015-2018. In connection with the dimensioning of the new wastewater system to the city, it has been found that mismatches can have great significance for the capacity of the wastewater system. At the same time, the study shows that even small proportion of mismatches can improve the system's self-cleaning ability. Therefore, it is considered that the amount of mismatches should be kept to a minimum, but little amounts of extraneous water in the system can improve certain operating conditions.
Emneord