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

WATER RESEARCH

卷:137

Article

Dereli, Recep Kaan^1,2  Wang, Xiaofei³  van der Zee, Frank P.⁴  van Lier, Jules B.² 

[1] Istanbul Tech Univ, Civil Engn Fac, Environm Engn Dept, TR-34469 Istanbul, Turkey

[2] Delft Univ Technol, Fac Civil Engn & Geosci, Dept Watermanagement, Sanit Engn Sect, Stevinweg 1, NL-2628 CN Delft, Netherlands

[3] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Quim, Lisbon, Portugal

[4] Biothane Syst Int, Italia Water Technol, Tanthofdreef 21, NL-2600 GB Delft, Netherlands

关键词: Anaerobic membrane bioreactor;    Cheese whey;    COD:TKN ratio;    Filterability;    Nitrogen;   

DOI  :  10.1016/j.watres.2018.03.015

来源: Elsevier

【 摘 要 】

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. (C) 2018 Elsevier Ltd. All rights reserved.

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