Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
679426 | Bioresource Technology | 2015 | 9 Pages |
Abstract
Rice straw was used as a carbon source in a denitrifying bioreactor, for the removal of nutrients from agricultural drainage. Nutrient removal efficiency was evaluated by: (a) nutrient loading rates (low, medium, and high); (b) hydraulic retention time, and (c) comparison with another carbon source (woodchip). The results show that concentrations of nitrate nitrogen (NO3â-N), ammonia nitrogen (NH4+-N), total nitrogen (TN), and orthophosphate phosphorus (PO43â-P) in the rice-straw bioreactor effluents were reduced by 53%, 25%, 40%, and 35%, respectively, compared with influents at the medium nutrient loading rate (NO3â-N: 10-15 mg N Lâ1, NH4+-N: 10-15 mg N Lâ1, PO43â-P: 1.0-1.5 mg P Lâ1) and long hydraulic retention time (HRT, 24 h), with a corresponding denitrification rate (DR) of 0.40 mg N Lâ1 hâ1. Moreover, the rice-straw bioreactor showed significantly higher (p < 0.05) nutrient removal efficiency than the woodchip bioreactor at the medium nutrient loading rate and 24 h HRT.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Xinqiang Liang, Limin Lin, Yushi Ye, Jiatao Gu, Zhibo Wang, Lixian Xu, Yi Jin, Qiukai Ru, Guangming Tian,