Biological performance and sludge filterability of anaerobic membrane bioreactors under nitrogen limited and supplied conditions.

Autor: Dereli RK; Istanbul Technical University, Civil Engineering Faculty, Environmental Engineering Department, Maslak, 34469, Istanbul, Turkey; Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Watermanagement, Sanitary Engineering Section, Stevinweg 1, 2628, CN Delft, The Netherlands. Electronic address: derelir@itu.edu.tr., Wang X; Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia, Departamento de Química, Lisbon, Portugal., van der Zee FP; Veolia Water Technologies, Biothane Systems International, Tanthofdreef 21, 2600, GB Delft, The Netherlands., van Lier JB; Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Watermanagement, Sanitary Engineering Section, Stevinweg 1, 2628, CN Delft, The Netherlands.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2018 Jun 15; Vol. 137, pp. 164-172. Date of Electronic Publication: 2018 Mar 07.
DOI: 10.1016/j.watres.2018.03.015
Abstrakt: The impact of nitrogen on biological performance and sludge filterability of anaerobic membrane bioreactors was investigated in two lab-scale cross-flow anaerobic membrane bioreactors that were fed with cheese whey at two different COD:TKN ratios (50 and 190). Nitrogen deprivation adversely affected the biological treatment performance and reactor stability, as indicated by volatile fatty acids accumulation. On the other hand, nitrogen (urea) supplementation resulted in a reduced sludge median particle size and decreased sludge filterability. Standard filterability parameters such as capillary suction time and specific resistance to filtration tended to rapidly increase in the nitrogen supplemented reactor. The critical fluxes in the nitrogen limited and supplemented reactors were 20 and 9 L m -2 h -1 , respectively. The rapid deterioration of sludge filterability under nitrogen supplemented conditions was attributed to abundant growth of dispersed biomass. Thus, the COD:TKN ratio of wastewater affected both bioconversion and filterability performance in the anaerobic membrane bioreactors.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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