Indexed by:期刊论文

Date of Publication:2009-04-01

Journal:ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY

Included Journals:SCIE、EI、Scopus

Volume:28

Issue:1

Page Number:155-161

ISSN No.:1944-7442

Key Words:simultaneous nitrification and denitrification; biological assimilation; membrane biorector; wastewater treatment

Abstract:The performance of an anoxic/oxic membrane bioreactor system for the simultaneous removal of nitrogen and chemical oxygen demand (COD) was investigated. This process removed up to 87% of total nitrogen (TN) and 94% of COD, with the influent concentrations of 200 mg NH(4)(+)-N/L and 4000 mg COD/L and a recycle ratio (R) of 200%. Biological assimilation and simultaneous nitrification and denitrification (SND) were considered on nitrogen removal process. The TN removal efficiency was above 87.5%, while the nitrogen being removed through SND was above 75.5% and nitrogen assimilated into the biomass was below 24.5%, with influent concentration below 200 mg NH(4)(+)-N/L, TN removal efficiency decreased significantly to 37.5%, of which 49.5% was provided by microorganism growth. Batch experiments provided evidence for the phenomena of SND. Furthermore, the SND removal efficneicy increased gradually from 26.8 to 90.0%. (C) 2008 American Institute of Chemical Engineers Environ Prog, 28: 155-161, 2009