49 29. évfolyam (2019) 2. szám 49–57. • DOI: 10.32562/mkk.2019.2. MŰSZAKI KÖZLÖNY KATO NAI Karches Tamás 1 – Salamon Endre 2 – Berek Tamás 3 Estimation of Attached Growth Process Aeration Requirement in Wastewater Treatment 4 Kötött biomasszát alkalmazó szennyvíztisztítási eljárások levegőigényének számítása Attached growth process in wastewater treatment is widely used in order to achieve the suffcient biodegradation of organic matter and nutrient removal. Since the bioflm is attached to a carrier in this process, the substrate and oxygen shall be transported to the biomass surface and reach the deeper layer of the bioflm via diffusion. The driving force of the process is the dissolved oxygen (DO) concentration difference, therefore at least 4–5 mg/L DO is required in this system, which is relatively high compared to activated sludge, where the DO is 1.8–2.5 mg/L. In the attached growth systems, where the suspended matter concentration is low, the relative oxygen diffusion rate (α) is about 0.7–0.8, which is an elevated value compared to the activated sludge system, where alpha is 0.4–0.5. The aim of this paper is to estimate the aeration requirement of the wastewater system applying bioflm; the above mentioned two properties are to be taken into account and the results will be compared to the conventional activated sludge system aeration need. Keywords: activated sludge, aeration, attached growth, bioflm, wastewater treatment 1 National University of Public Service, Associate Professor, e-mail: Karches.Tamas@uni-nke.hu, ORCID: 0000- 0003-2347-3559 2 National University of Public Service, Assistant Lecturer, e-mail: Salamon.Endre@uni-nke.hu, ORCID: 0000- 0002-3856-1941 3 National University of Public Service, Associate Professor, e-mail: Berek.Tamas@uni-nke.hu, ORCID: 0000-0001- 8358-6139 4 This work has been undertaken as a part of a project founded by EFOP-3.6.1-16-2016-00025 aiming the devel- opment of water management in higher education in the frame of intelligent specialization. 4.