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    Differences in Ammonia Self-Purification between Simulated and Actual Rivers under Different Flow Velocities

    Source: Journal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 008::page 04025042-1
    Author:
    Zhaoxu Peng
    ,
    Xuegang Mu
    ,
    Tingmei Li
    ,
    Yu He
    ,
    Ziyao Hao
    ,
    Luji Yu
    ,
    Xiaoyan Lv
    DOI: 10.1061/JOEEDU.EEENG-8087
    Publisher: American Society of Civil Engineers
    Abstract: This study investigated the degradation of NH4+-N in river channels under varying flow velocities, using both a simulated river channel (SRC) and a practical river channel (PRC) to treat discharge from an urban wastewater treatment plant (WWTP). The results showed that NH4+-N degradation follows first-order kinetics, with the degradation coefficient (KNH4+-N) increasing as flow velocity increases. By analyzing the microbial and physicochemical pathways of ammonia nitrogen degradation, the contribution differences between the two can be effectively highlighted. In the SRC, at an NH4+-N concentration of 2.41±0.48  mg·L−1, KNH4+-N rose from 0.10  day−1 (0.01  m·s−1) to 0.26  day−1 (0.02  m·s−1). In the PRC, at an NH4+-N concentration of 1.86±0.18  mg·L−1, KNH4+-N increased from 0.19  day−1 (0.10  m·s−1) to 0.28  day−1 (0.18  m·s−1). Ammonia-oxidizing bacteria (AOB), such as Nitrosomonas, were detected with counts increasing at higher flow velocities, while other AOB and nitrite-oxidizing bacteria (NOB) were not detected. This study confirmed that the degradation of NH4+-N in rivers is determined by the influence of flow velocity on the balance of ammonia particles and free ammonia in water, which significantly affects the removal of NH4+-N. The maximum removal efficiency in the study was 35.36%. In conclusion, the findings of this study highlight the significant role of flow velocity in enhancing NH4+-N degradation in river channels, with higher velocities promoting both faster degradation rates and greater ammonia-oxidizing bacteria abundance, ultimately improving the efficiency of NH4+-N removal from urban wastewater discharges.
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      Differences in Ammonia Self-Purification between Simulated and Actual Rivers under Different Flow Velocities

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    contributor authorZhaoxu Peng
    contributor authorXuegang Mu
    contributor authorTingmei Li
    contributor authorYu He
    contributor authorZiyao Hao
    contributor authorLuji Yu
    contributor authorXiaoyan Lv
    date accessioned2025-08-17T23:01:58Z
    date available2025-08-17T23:01:58Z
    date copyright8/1/2025 12:00:00 AM
    date issued2025
    identifier otherJOEEDU.EEENG-8087.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307806
    description abstractThis study investigated the degradation of NH4+-N in river channels under varying flow velocities, using both a simulated river channel (SRC) and a practical river channel (PRC) to treat discharge from an urban wastewater treatment plant (WWTP). The results showed that NH4+-N degradation follows first-order kinetics, with the degradation coefficient (KNH4+-N) increasing as flow velocity increases. By analyzing the microbial and physicochemical pathways of ammonia nitrogen degradation, the contribution differences between the two can be effectively highlighted. In the SRC, at an NH4+-N concentration of 2.41±0.48  mg·L−1, KNH4+-N rose from 0.10  day−1 (0.01  m·s−1) to 0.26  day−1 (0.02  m·s−1). In the PRC, at an NH4+-N concentration of 1.86±0.18  mg·L−1, KNH4+-N increased from 0.19  day−1 (0.10  m·s−1) to 0.28  day−1 (0.18  m·s−1). Ammonia-oxidizing bacteria (AOB), such as Nitrosomonas, were detected with counts increasing at higher flow velocities, while other AOB and nitrite-oxidizing bacteria (NOB) were not detected. This study confirmed that the degradation of NH4+-N in rivers is determined by the influence of flow velocity on the balance of ammonia particles and free ammonia in water, which significantly affects the removal of NH4+-N. The maximum removal efficiency in the study was 35.36%. In conclusion, the findings of this study highlight the significant role of flow velocity in enhancing NH4+-N degradation in river channels, with higher velocities promoting both faster degradation rates and greater ammonia-oxidizing bacteria abundance, ultimately improving the efficiency of NH4+-N removal from urban wastewater discharges.
    publisherAmerican Society of Civil Engineers
    titleDifferences in Ammonia Self-Purification between Simulated and Actual Rivers under Different Flow Velocities
    typeJournal Article
    journal volume151
    journal issue8
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/JOEEDU.EEENG-8087
    journal fristpage04025042-1
    journal lastpage04025042-9
    page9
    treeJournal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 008
    contenttypeFulltext
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