Nitrogen dynamics and microbial community compositions in six vertical flow wetland colums

Sun, Guangzhi, Zhu, Yafei, and Saeed, Tanveer (2012) Nitrogen dynamics and microbial community compositions in six vertical flow wetland colums. In: Proceedings of the 6th International Conference on Environmental Science and Technology (2) pp. 254-260. From: ICEST2012: 6th International Conference on Environmental Science and Technology, 25-29 June 2012, Houston, TX, USA.

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Two synthetic wastewaters, with mean NH4 concentrations of 471±19 and 475±17 mg/L, were treated in six planted columns. Under steady hydraulic and pollutant loading, average NH4 removal rate in each column was in the range of 21-47 g/m2d, while average TN removal rate was 0-27 g/m2d. In general, higher redox potential values benefitted ammonia removal but limited TN removal. The supply of organic carbon, by adding glucose into the synthetic wastewater, slightly reduced the rate of ammonia removal, but significantly enhanced TN removal. The seeding of microorganisms using diluted activated sludge, and submerging the columns with treated effluent for three days per week, intensified microbial activities; oxygen consumption reached 53-363 gO2/m2d due to microbial degradations of organics and nitrogen. Fluorescence in situ hybridization analysis of bacterial biomass revealed the population densities of nitrifying bacteria, and specific denitrifying bacteria (Azoarcus-Thauera-cluster, genus Hyphomicrobium, genus Paracoccus, and family Saprospiraceae). Denitrifier Azoarcus-Thauera-cluster was found to be the dominant bacterial group (58% of all cells) when organic carbon is available. Without the supply of organic carbon, ammonium oxidising bacteria (AOB) dominate microbial populations in the planted columns.

Item ID: 30458
Item Type: Conference Item (Presentation)
ISBN: 978-1-62748-656-9
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This paper has also been published as an article in the Chemical Engineering Journal. Please see the Related URL link.

Sun, Guangzhi, Zhu, Yafei, Saeed, Tanveer, Zhang, Guangxin, and Lu, Xianguo (2012) Nitrogen removal and microbial community profiles in six wetland columns receiving high ammonia load. Chemical Engineering Journal, 203. pp. 326-332.

Date Deposited: 30 Jul 2014 23:22
FoR Codes: 09 ENGINEERING > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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