Journal
BIORESOURCE TECHNOLOGY
Volume 116, Issue -, Pages 266-270Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.02.050
Keywords
Heterotrophic nitrification; Aerobic denitrification; Rhodococuus sp.
Funding
- National Science and Technology Support Plan [2009BADC2B04, 2006BAD17B09, 2006BAD10B09]
- National 973 Plan from MOST, China [2012CB417100]
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Rhodococcus sp. CPZ24 was isolated from swine wastewater and identified. Batch (0.25 L flask) experiments of nitrogen removal under aerobic growth conditions showed complete removal of 50 mg L-1 ammonium nitrogen within 20 h, while nitrate nitrogen removal reached 67%. A bioreactor (50 L) was used to further assess the heterotrophic nitrification and aerobic denitrification abilities of Rhodococcus sp. CPZ24. The results showed that 85% of the ammonium nitrogen (100 mg L-1) was transformed to nitrification products (NO3--N and NO2--N) (13%), intracellular nitrogen (24%), and gaseous denitrification products (48%) within 25 h. The ammonium nitrogen removal rate was 3.4 mg L-1 h(-1). The results indicate that the strain CPZ24 carries out simultaneous nitrification and denitrification, demonstrating a potential use of the strain for wastewater treatment. (C) 2012 Elsevier Ltd. All rights reserved.
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