Volume 8 Issue 5
Sep.  2018
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Article Navigation >  Journal of Environmental Engineering Technology  > 2018  >  8(5): 481-487
WU Xin, HE Shuzhuang, LU Yifeng, LU Shaoyong, ZHANG Junpeng, HU Tao, ZHANG Senlin, CHEN Fangxin. Effects of inflow modes on sewage nitrogen removal by ecological gravel beds[J]. Journal of Environmental Engineering Technology, 2018, 8(5): 481-487. doi: 10.3969/j.issn.1674-991X.2018.05.063
Citation: WU Xin, HE Shuzhuang, LU Yifeng, LU Shaoyong, ZHANG Junpeng, HU Tao, ZHANG Senlin, CHEN Fangxin. Effects of inflow modes on sewage nitrogen removal by ecological gravel beds[J]. Journal of Environmental Engineering Technology, 2018, 8(5): 481-487. doi: 10.3969/j.issn.1674-991X.2018.05.063
shu

Effects of inflow modes on sewage nitrogen removal by ecological gravel beds

doi: 10.3969/j.issn.1674-991X.2018.05.063

  • 1.School of Ecology and Environment Science, Yunnan University, Kunming 650091, China
    2 National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research

  • Academy of Environmental Sciences, Beijing 100012, China
    3.Liupanshui Municipal Agriculture Committee, Liupanshui 553000, China

  • Received Date: 2018-05-30
  • Publish Date: 2018-09-20
    Abstract
  • In order to improve the nitrogen removal rate of residential sewage by ecological gravel beds, four kinds of constructed ecological gravel bed were designed, including Schoenoplectus tabernaemontani bed, Phragmites australis bed, Typha orientalis bed and blank bed without vegetation. The effects of two inflow modes, i.e. continuous inflow and intermittent inflow, on the removal of TN, NH4+-N, and NO3--N were studied. The hydraulic load (HL) was 7.5 cm∕d and the hydraulic retention time (HRT) was 1.8 d under the continuous inflow, while the HL was 7.5 cm∕d and the HRT was 5.4 d under the intermittent inflow. The results show that there exists great difference of the nitrogen removal efficiency between two inflow modes for different ecological gravel beds. The removal rates of TN and ammonia nitrogen under continuous inflow were in the order of Typha orientalis bed> Schoenoplectus tabernaemontani bed > blank bed > Phragmites australis bed, with the highest removal rates by Typha orientalis bed, which removal rate of TN and ammonia nitrogen were 77.68% and 81.33%, respectively; the removal rates of nitrate nitrogen were in the order of blank bed>Phragmites australis bed>Tyha orientalis bed>Schoenoplectus tabernaemontani bed, with thee highest removal rates by blank bed, which removal rate of nitrate nitrogen was 65.29%. The removal rates of TN and ammonia nitrogen under intermittent inflow were in the order of Schoenoplectus tabernaemontani bed > Phragmites australis bed > Typha orientalis bed> blank bed, and the effect of Schoenoplectus tabernaemontani bed was the best, which removal rate of TN and ammonia nitrogen were 89.54% and 91.79%, respectively; the removal rates of nitrate nitrogen were in the order of Schoenoplectus tabernaemontani bed>Typha orientalis bed>blank bed>Phragmites australis bed, the Schoenoplectus tabernaemontanid bed was the best with a removal rate of 46.43%. The removal efficiency of ammonia nitrogen and TN were better improved by intermittent inflow in plant systems. The removal rate of TN and ammonia nitrogen increased by 19.63% and 14.76% in Phragmites australis bed, and the removal rate of TN and ammonia nitrogen increased by 19.14% and 18.60% in Schoenoplectus tabernaemontani bed, respectively.

     

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