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• W201613619 abstract "High nitrogen concentrations in process water from tunnel constructions have become an issue due to residues from explosive, transported to recipients in the construction area. Biological treatment in terms of nitrification and denitrification are necessary to remove the nitrogen compounds in the process water. Skanska Sweden AB is currently constructing a tunnel in Tanumshede called the Gerum tunnel, for which the biological treatment of the process water has not worked during the project why this study was initiated. The aim of this master thesis was to assess which factors and parameters affect the biological treatment of process water in tunnel construction with regard to nitrification and denitrification. Lab tests on process water from the tunnel project were performed to achieve a complete nitrification and denitrification. Three nitrification tests and one denitrification test were performed in the lab where the first nitrification test used process water from two separate days and sludge that was collected from a wastewater treatment plant. The nitrification process was incomplete since nitrate did not increase even though there was a slight decrease in ammonium and a slight increase in nitrite. The second test comprised of the same water and sludge materials as Test 1 with the exception of adding sodium dihydrogen phosphate, thereby increasing the phosphate concentrations which were thought to limit the reactions. This test also failed to show any nitrifying activity. The alkalinity measured in the process water was very low and for the third test, alkalinity and phosphate were therefore increased. This test gave the best results of the nitrification tests and resulted in ammonium being converted to nitrite, however the process failed to transform nitrite to nitrate. The results from the denitrification test did show a denitrifying activity when nitrate was transformed to nitrite at the same time as total nitrogen (TN) decreased which indicates that nitrogen gas has been formed, though the test should have been carried out for a longer period of time. Further lab analysis on process water in tunnels with high nitrogen content is crucial which should focus on metal concentration and the proportions of sludge and process water since those parameters were not thoroughly analyzed in this study." @default.
• W201613619 created "2016-06-24" @default.
• W201613619 creator A5076001561 @default.
• W201613619 date "2014-01-01" @default.
• W201613619 modified "2023-09-24" @default.
• W201613619 title "Nitrogen removal in process water from the Gerum tunnel" @default.
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