title: Comparative studies on the differently operated trains of the North-Budapest Wastewater Treatment Plant.
abstract: In order to reduce the pollution load of the Danube, the North-Budapest Wastewater Treatment Plant has been upgraded to enhanced nitrogen removal by establishing a new activated sludge treatment line and modifying the existing unit for nitrification and denitrification. As both the influent flow rate and the influent chemical oxygen demand (COD), biological oxygen demand (BOD(5)) and total suspended solids (TSS) concentration levels remained far below the design values, setting one fourth of the reactor volume out of operation in the Old Line, and operating the nitrification reactor of the New Line with part-time aeration proved to be possible. Analytical data as well as simulation studies supported the advantage of the intermittent-aeration process in efficient N-removal. However, the lengths of the aerated periods have to be increased with decreasing temperature, and thereby effluent total nitrogen (TN) concentration can increase due to decreasing denitrification efficiency. Potential occurrence of low-dissolved oxygen (DO) bulking should be hindered through applying an efficient anoxic selector system.
authors.affiliation: Budapest University of Technology and Economics, Department of Applied Biotechnology and Food Science, Budapest, Hungary. ajobbagy@mail.bme.hu
authors.forename: A
authors.initials: A
authors.lastname: Jobbágy
authors.forename: Gy
authors.initials: G
authors.lastname: Palkó
authors.forename: T
authors.initials: T
authors.lastname: Weinpel
authors.forename: M
authors.initials: M
authors.lastname: Makó
mesh_terms: D057919:Biological Oxygen Demand Analysis; D006814:Hungary; D009584:Nitrogen / Q000737:chemistry*; D045483:Rivers; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014877:Water Pollution, Chemical / Q000517:prevention & control*
chemical_list: D012722:Sewage; D009584:Nitrogen