Simultaneous Removal of Organic and Nitrogen in a Post-Denitrification Membrane Bioreactor (MBR) System and its Influential Factors

Author(s): Feiyun Sun, Pu Li, Lichun Chen

Journal Name: Current Environmental Engineering
Continued as Current Environmental Management

Volume 2 , Issue 1 , 2015

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A post-denitrification membrane bioreactor (MBR) system was developed to simultaneously remove organics and nitrogen from domestic wastewater. From a long-term experimental investigation, more than 96% organics could be degraded biologically and the effluent Chemical Oxygen Demand (COD) was below 10.5 mg/L. With a Hydraulic Retention Time (HRT) of 13.6 h and a total recirculation ratio of 8×Q, the MBR system could obtain a stably high Total Nitrogen (TN) removal efficiency of up to 92.4%, resulted in an effluent TN content of as low as 2.80 mg/L. Effects of operating parameters, including HRT, Sludge Retention Time (SRT), recirculation ratio and influent C/N, onto the system treatment performance were evaluated. It was revealed that HRT and recirculation ratio had significant impacts onto TN removal efficiency, reflected by that a reduced HRT to 9 h and a lower recirculation of 6×Q induced to 78.2% TN removal and an effluent TN of about 14 mg/L. A proper SRT and C/N ranged from 12 to 40 days, and from 8:1 to 13.5:1, respectively, have insignificant impacts onto the organic degradation and ammonia-N removal. Nevertheless, TN removal was highly inhibited by low SRT and C/N ratios. MBR combination with post-denitrification helps to enhance the organic and nitrogen removal compared with conventional activated sludge process, as it ensured a high biomass level in the treatment system.

Keywords: Biological nitrogen removal, membrane bioreactor (MBR), nitrogen gas, organic degradation, post-denitrification, wastewater treatment.

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Article Details

Year: 2015
Page: [4 - 10]
Pages: 7
DOI: 10.2174/221271780201150831142944

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PDF: 34