期刊
WATER RESEARCH
卷 46, 期 16, 页码 4941-4948出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2012.05.050
关键词
Denitrification; Nitrate; Immobilization; Activation energy; Hyphomicrobium
This study evaluated the nitrogen removal performance of polyethylene glycol (PEG) gel carriers containing entrapped heterotrophic denitrifying bacteria. A laboratory-scale denitrification reactor was operated for treatment of synthetic nitrate wastewater. The nitrogen removal activity gradually increased in continuous feed experiments, reaching 4.4 kg N m(-1) d(-1) on day 16 (30 degrees C). A maximum nitrogen removal rate of 5.1 kg N m(-3) d(-1) was observed. A high nitrogen removal efficiency of 92% on average was observed at a high loading rate. In batch experiments, the denitrifying gel carriers were characterized by temperature. Nitrate and total nitrogen removal activities both increased with increasing temperature, reaching a maximum at 37 and 43 degrees C, respectively. Apparent activation energies for nitrate and nitrite reduction were 52.1 and 71.9 kJ mol(-1), respectively. Clone library analysis performed on the basis of the 16S rRNA gene revealed that Hyphomicrobium was mainly involved in denitrification in the methanol-fed denitrification reactors. (C) 2012 Elsevier Ltd. All rights reserved.
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