Volume 8 Issue 1
Jan.  2015
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Article Navigation >  Water Science and Engineering  > 2015  >  8(1): 49-54
Ying-hua LI, Hai-bo LI, Xin-yang XU, Xuan GONG, Yong-chun ZHOU. 2015: Application of subsurface wastewater infiltration system to on-site treatment of domestic sewage under high hydraulic loading rate. Water Science and Engineering, 8(1): 49-54. doi: 10.1016/j.wse.2015.01.008
Citation: Ying-hua LI, Hai-bo LI, Xin-yang XU, Xuan GONG, Yong-chun ZHOU. 2015: Application of subsurface wastewater infiltration system to on-site treatment of domestic sewage under high hydraulic loading rate. Water Science and Engineering, 8(1): 49-54. doi: 10.1016/j.wse.2015.01.008
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Application of subsurface wastewater infiltration system to on-site treatment of domestic sewage under high hydraulic loading rate

doi: 10.1016/j.wse.2015.01.008

  • School of Resources and Civil Engineering, Northeastern University, Shenyang 110004, P. R. China

Funds:  this work was supported by the National Natural Science Foundation of China (Grant No. 51108275), the Program for Liaoning Excellent Talents in Universities (LNET) (Grant No. LJQ2012101), the Program for New Century Excellent Talents in Universities (Grant No. NCET-11-1012), the Science and Technology Program of Liaoning Province (Grants No. 2011229002 and 2013229012), and the Basic Science Research Fund in Northeastern University (Grants No. N130501001 and N140105003).
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  • Corresponding author: Hai-bo LI
  • Received Date: 2014-02-17
  • Rev Recd Date: 2015-01-05
    Abstract
  • In order to enhance the hydraulic loading rate (HLR) of a subsurface wastewater infiltration system (SWIS) used in treating domestic sewage, the intermittent operation mode was employed in the SWIS. The results show that the intermittent operation mode contributes to the improvement of the HLR and the pollutant removal rate. When the wetting-drying ratio (RWD) was 1.0, the pollutant removal rate increased by (13.6 ± 0.3)% for NH3-N, (20.7 ± 1.1)% for TN, (18.6 ± 0.4)% for TP, (12.2 ± 0.5)% for BOD, (10.1 ± 0.3)% for COD, and (36.2 ± 1.2)% for SS, compared with pollutant removal rates under the continuous operation mode. The pollutant removal rate declined with the increase of the HLR. The effluent quality met The Reuse of Urban Recycling Water - Water Quality Standard for Scenic Environment Use (GB/T 18921-2002) even when the HLR was as high as 10 cm/d. Hydraulic conductivity, oxygen reduction potential (ORP), the quantity of nitrifying bacteria, and the pollutant removal rate of NH3-N increased with the decrease of the RWD. For the pollutant removal rates of TP, BOD, and COD, there were no significant difference (p < 0.05) under different RWDs. The suggested RWD was 1.0. Relative contribution of the pretreatment and SWIS to the pollutant removal was examined, and more than 80% removal of NH3-N, TN, TP, COD, and BOD occurred in the SWIS.

     

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