Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4389274 | Ecological Engineering | 2015 | 9 Pages |
Abstract
To determine nitrogen removal methods and the factors that limit denitrifying reactions during the sewage purification processes in deep subsurface wastewater infiltration systems, an organic glass column with a radius of 0.30 m and a height of 2.00 m was loaded with layers of soil from the Shunyi district of Beijing. Good performance was achieved under a hydraulic loading of 8 cm/d. In addition, TP was nearly removed, and the effluent NH4+-N, TN, and COD concentrations were 0.14, 11.2, and 16.0 mg Lâ1, respectively. Correspondingly, the removal efficiencies of NH4+-N, TN, COD and TP were 99.77, 83.68, 95.86 and 99.98%, respectively. According to the nitrogen variations with depth, 30.55% of the nitrogen missed at depths of up to 1.30 m. A mass-balance and phylogenetic analysis indicated that completely autotrophic nitrogen-removal over nitrite (CANON) occurred. Furthermore, 47.54% of the NH4+-N participated in CANON, and the remaining NH4+-N played a role in nitrification. At depths of more than 1.30 m, nitrogen was mainly removed by denitrification. In the process of denitrification, the change in the COD and the three-dimensional fluorescence spectra indicated that refractory organics could be used as a carbon source for denitrification.
Keywords
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Authors
Lie-Yu Zhang, Yu-Bing Ye, Li-Jun Wang, Bei-Dou Xi, Hong-Qiang Wang, Ye Li,