Premium
Simultaneous Nitrification and Denitrification of Municipal Wastewater in Aerobic Membrane Bioreactors
Author(s) -
Baek Seung H.,
Pagilla Krishna R.
Publication year - 2008
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143007x220725
Subject(s) - kjeldahl method , chemistry , wastewater , chemical oxygen demand , hydraulic retention time , membrane bioreactor , nitrification , denitrification , nitrogen , bioreactor , pulp and paper industry , environmental chemistry , environmental engineering , environmental science , organic chemistry , engineering
Simultaneous nitrification–denitrification (SND) of municipal wastewater was investigated in a laboratory‐scale membrane bioreactor (MBR) operated at two different hydraulic retention times (HRTs), 0.5 and 1 day, dissolved oxygen 3.0 to 0.5 mg/L, and solids retention time (SRT) between 28 and 120 days. The organic loading rate (OLR) (0.11 to 0.64 kg chemical oxygen demand [COD]/m 3 /d) and influent soluble COD (SCOD)/total Kjeldahl nitrogen (TKN) ratio (5 to 19) were varied by the addition of glucose. The ammonia‐nitrogen and TKN removals were over 97%, and total nitrogen removal was approximately 89% in the MBR. The maximum specific nitrification rates (98 mg N/d/g VSS) and specific denitrification rates (81 mg N/d/g VSS) occurred at an SCOD/TKN ratio of 9.1. The optimum conditions for maximum total nitrogen removal by SND in a single reactor MBR have been found to be low dissolved oxygen (<0.6 mg/L) and high OLR (approximately 0.64 kg COD/m 3 /d) at an HRT of 0.5 day and SRT of approximately 85 days.