High Nitrate Removal in a Packed Bed Bioreactor Using Microbial Cellulose
Research Journal of Environmental Sciences 2 (6): 424-432,2008
ISSN 1819-3412
2008 Academic Journals Inc.
High Nitrate Removal in a Packed Bed Bioreactor Using Microbial Cellulose
Abbas Rezaee, Hatam Godini, N ayara Naimi, Hossein Masombeigi,
Ahmadreza Yazdanbakhsh, Gholamreza Mosavi and Anoshiravan Kazemnejad
Abstract:
An up-flow packed bed reactor has been operated to investigate the technical feasibility of iological nitrate removal applied to the synthetic solution. This study was evaluated Microbial Cellulose (MC) as a biopolymer carrier in a laboratory bioreactor. The effects of nitrate content and flow rate on the nitrate removal performance of a MC packed bed bioreactor have been investigated. Ethanol was used as a carbon source for biological denitrification. It was fmmd that up to 500 mg L -l nitrate concentration the present system is able to produce an effluent with nitrate content below 10 ppm at 3 h hydraulic retention time. The highest observed denitrification rate was 4.57 kg N03- N/(m3 day) at a nitrate load of 5.64 kg N03-N/(m3 day). The removal efficiencies higher than 90% were obtained for loads up to 4.2 kg N03-N/(m3 day). A mass relation between COD consllllled and N03-N removed by 2.82 was observed. This continuous flow pilot bioreactor proved an efficient denitrification system with a relatively low retention time.
Key words: Nitrate, denitrification, microbial cellulose, packed bed, bioreactor
http://www.sbmu.ac.ir/Articles/Documents/BehdashtSchool/
Dr.yazdanbakhsh/peper-nitrat.pdf
