ZHANGRu-bin,LIUQing-quan,XUQiang-qiang,et al.Effect of Carbon and Oxygen Regulated Bioretention Cell on Removal of Nitrogen Pollutants in Surface Runoff[J].China Water & Wastewater,2023,39(21):117-122.
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Effect of Carbon and Oxygen Regulated Bioretention Cell on Removal of Nitrogen Pollutants in Surface Runoff

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第21期 Page: 117-122 Column: Date of publication: 2023-11-01
Author(s):
ZHANG　Ru-bin1; 2; 3;  LIU　Qing-quan1; 2;  XU　Qiang-qiang1; 2; 3;  WANG　Le-yang1; 2; 3
（1. Jiangsu Long-leaping Engineering Design Co. Ltd.， Nanjing 210014， China； 2. Jiangsu Rain? water Recycling Engineering Technology Research Center， Nanjing 210014， China； 3. Nanjing Ecological River Engineering Technology Research Center， Nanjing 210014， China）
Keywords:
bioretention cell;  carbon and oxygen regulation;  surface runoff;  nitrogen removal
Abstract:
By comparing with the non-regulated bioretention cell, four kinds of modified bioloretention cells including carbon source addition, aeration-carbon source addition, submerged zone-carbon source addition, and aeration-submerged zone-carbon source addition were constructed to explore their nitrogen removal performance under different hydraulic retention times (HRT), so as to solve the problem of bioretention cells’ poor and unstable removal efficiency of nitrogen pollutants from surface runoff. The single aeration or the setting of submerged zone only ensured a stable anaerobic or aerobic environment, while the simultaneous aeration and submerged zone stably regulated the aerobic and anaerobic environment of the upper and lower layers of the bioretention cell. The DO of the upper and lower layers of the bioretention cell with aeration, carbon source addition and submerged zone were 6.52-7.58 mg/L and 0.51-2.67 mg/L, respectively. The increase of HRT significantly improved the removal efficiencies of COD and NH3-N in each bioretention cell. However, the removal efficiencies of NO3--N and TN in the aeration-carbon source addition group and the aeration-submerged zone-carbon source addition group firstly increased and then decreased, and the long-term aeration led to the decrease of nitrogen removal efficiency. Compared with the non-regulated bioretention cell, the efficiencies of the four regulated bioretention cells for COD, NH3-N, NO3--N and TN removal were all improved. In particular, the TN removal rate of the aeration-submerged zone-carbon source addition group reached the highest of 86.85% under the condition of HRT of 4 h. Therefore, the modification of bioretention cells through carbon and oxygen regulation can significantly promote the reduction of nitrogen pollutants in surface runoff.
Last Update: 2023-11-01