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.
碳氧调控生物滞留池对径流中氮污染物的去除效果
- Title:
- Effect of Carbon and Oxygen Regulated Bioretention Cell on Removal of Nitrogen Pollutants in Surface Runoff
- 摘要:
- 针对生物滞留池对地表径流中氮污染物去除效率差、不稳定的问题，以无调控生物滞留池为对照，构建碳源投加、曝气-碳源投加、淹没区-碳源投加以及曝气-淹没区-碳源投加4种改良生物滞留池，探讨其在不同水力停留时间（HRT）下的脱氮效果。结果表明，单一曝气或者设置淹没区仅能保证稳定的厌氧或好氧环境，而同时曝气和设置淹没区可以稳定调控生物滞留池上层好氧和下层厌氧环境，曝气-淹没区-碳源投加组装置的上层和下层DO浓度分别为6.52~7.58、0.51~2.67 mg/L；增大HRT能够显著提高各生物滞留池对COD和NH3-N的去除效果，而曝气-碳源投加组和曝气-淹没区-碳源投加组装置对NO3--N和TN的去除效果先升高后降低，长时间曝气会导致脱氮效果下降；相较于无调控生物滞留池，4种调控生物滞留池对COD、NH3-N、NO3--N和TN的去除效果均有不同程度提升，尤其在HRT为4 h的条件下，曝气-淹没区-碳源投加组的脱氮效果最高，达到了86.85%。因此，通过碳氧调控改良生物滞留池对地表径流中氮污染物的削减有显著促进作用。
- 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.
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