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COD/N对潜流人工湿地脱氮效能及N2O排放的影响

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刘庚, 李胜男, 黄磊, 张绍博, 李鑫, 陈玉成, 高旭. COD/N对潜流人工湿地脱氮效能及N2O排放的影响[J]. 环境工程学报, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
引用本文: 刘庚, 李胜男, 黄磊, 张绍博, 李鑫, 陈玉成, 高旭. COD/N对潜流人工湿地脱氮效能及N2O排放的影响[J]. 环境工程学报, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
shu
LIU Geng, LI Shengnan, HUANG Lei, ZHANG Shaobo, LI Xin, CHEN Yucheng, GAO Xu. Impacts of COD/N ratios on nitrogen removal efficiencies and nitrous oxide emissions in subsurface flow constructed wetlands[J]. Chinese Journal of Environmental Engineering, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
Citation: LIU Geng, LI Shengnan, HUANG Lei, ZHANG Shaobo, LI Xin, CHEN Yucheng, GAO Xu. Impacts of COD/N ratios on nitrogen removal efficiencies and nitrous oxide emissions in subsurface flow constructed wetlands[J]. Chinese Journal of Environmental Engineering, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
shu

COD/N对潜流人工湿地脱氮效能及N2O排放的影响

  • 1.

    西南大学资源环境学院, 重庆 400716

  • 2.

    重庆市农业资源与环境重点实验室, 重庆 400716

  • 3.

    重庆市水务集团股份有限公司, 重庆 400013

  • 基金项目:

    国家自然科学基金资助项目（51408493）

  • 中图分类号: X703.1

Impacts of COD/N ratios on nitrogen removal efficiencies and nitrous oxide emissions in subsurface flow constructed wetlands

  • 1.

    College of Resources and Environment, Southwest University, Chongqing 400716, China

  • 2.

    Chongqing Key Lab of Agricultural Resources & Environment, Chongqing 400716, China

  • 3.

    Chongqing Water Group Co. Ltd., Chongqing 400013, China

  • Fund Project:

  • 摘要: 人工湿地因其低能耗、易管理的优点被广泛应用于水处理和生态修复，尤其在发展中国家有其适用性。为探讨COD/N对潜流人工湿地脱氮效能及氧化亚氮（N2O）的排放影响，分别构建5组微型人工湿地CW1~CK，进水化学需氧量/总氮（COD/N）分别为20：1、10：1、7：1、4：1和0：1。结果表明，湿地出水DO浓度均低于0.5 mg·L-1，不同的COD/N下无显著差异，但pH表现为随COD/N的升高而降低。进水COD/N为10、7和4的湿地中COD去除率在80%以上，而进水COD/N=20的湿地中COD去除率不足70%。5组COD/N湿地中氨氮（NH4+-N）的平均去除率依次为（61±16.6）%、（23±14.1）%、（30±12.5）%、（28±14.5）%和（74±7.0）%，在碳源充足或无碳源的条件下有利于NH4+-N的去除。除COD/N=0外，其余湿地中出水未检测到硝态氮（NO3--N）。湿地中总氮（TN）的去除变化与NH4+-N相似。5组湿地系统中，N2O的平均释放通量和累积排放量，分别在0.83~11.84 mg·（m2·h）-1和30.65~490.80 mg·m-2之间。COD/N=4的人工湿地系统中，N2O的平均释放通量和累计排放量显著高于其他处理（p2O形态去除的氮占系统去除TN的百分比为4.87%。COD/N对潜流人工湿地的脱氮和N2O减量具有调控作用。
    Abstract: Constructed wetlands (CWs) have high potential for wastewater treatment and ecological remediation in developing countries because they are easily manageable and require low energy. In order to investigate the impacts of different influent COD/N ratios on nitrogen removal efficiencies and nitrous oxide (N2O) emissions in CWs, five different constructed microcosm wetlands (named CW1 to CK) were started up with the influent COD/N ratios of 20:1, 10:1, 7:1, 4:1, and 0:1, respectively. The results showed that the effluent dissolved oxygen (DO) was -1, with no significant differences between all CWs. However, the pH decreased with increasing COD/N ratio. When the influent COD/N ratios were 10:1, 7:1, or 4:1, the chemical oxygen demand (COD) removal rates were all above 80%. However, the COD removal rate was less than 70% in CW1, with the influent COD/N 20:1. The average ammonium (NH4+-N) removal rates in the five CWs were (61±16.6)%, (23±14.1)%, (30±12.5)%, (28±14.5)%, and (74±7.0)%. The NH4+-N removal could be enhanced with enough, or without carbon resources. The effluent nitrate (NO3--N) was hard to detect in CWs, except in CK, with the influent COD/N ratio=0:1. The changes of total nitrogen (TN) were similar to NH4+-N in all CWs. In the five CWs, the average flux and cumulative emissions of N2O were 0.83 to 11.84 mg·(m2·h)-1 and 30.65 to 490.80 mg·m-2. The value in CW4 was significantly higher than other treatments (p2O accounted for 4.87% of the removed TN in CW4. The influent COD/N ratios are important in regulating nitrogen removal and N2O emission in subsurface-flow constructed wetlands.
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  • 收稿日期:  2015-09-22
  • 刊出日期:  2016-12-08
刘庚, 李胜男, 黄磊, 张绍博, 李鑫, 陈玉成, 高旭. COD/N对潜流人工湿地脱氮效能及N2O排放的影响[J]. 环境工程学报, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
引用本文: 刘庚, 李胜男, 黄磊, 张绍博, 李鑫, 陈玉成, 高旭. COD/N对潜流人工湿地脱氮效能及N2O排放的影响[J]. 环境工程学报, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
shu
LIU Geng, LI Shengnan, HUANG Lei, ZHANG Shaobo, LI Xin, CHEN Yucheng, GAO Xu. Impacts of COD/N ratios on nitrogen removal efficiencies and nitrous oxide emissions in subsurface flow constructed wetlands[J]. Chinese Journal of Environmental Engineering, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
Citation: LIU Geng, LI Shengnan, HUANG Lei, ZHANG Shaobo, LI Xin, CHEN Yucheng, GAO Xu. Impacts of COD/N ratios on nitrogen removal efficiencies and nitrous oxide emissions in subsurface flow constructed wetlands[J]. Chinese Journal of Environmental Engineering, 2016, 10(12): 6907-6913. doi: 10.12030/j.cjee.201507170
shu

COD/N对潜流人工湿地脱氮效能及N2O排放的影响

  • 1.  西南大学资源环境学院, 重庆 400716
  • 2.  重庆市农业资源与环境重点实验室, 重庆 400716
  • 3.  重庆市水务集团股份有限公司, 重庆 400013
  • 收稿日期:  2015-09-22
基金项目:

国家自然科学基金资助项目（51408493）

摘要: 人工湿地因其低能耗、易管理的优点被广泛应用于水处理和生态修复，尤其在发展中国家有其适用性。为探讨COD/N对潜流人工湿地脱氮效能及氧化亚氮（N2O）的排放影响，分别构建5组微型人工湿地CW1~CK，进水化学需氧量/总氮（COD/N）分别为20：1、10：1、7：1、4：1和0：1。结果表明，湿地出水DO浓度均低于0.5 mg·L-1，不同的COD/N下无显著差异，但pH表现为随COD/N的升高而降低。进水COD/N为10、7和4的湿地中COD去除率在80%以上，而进水COD/N=20的湿地中COD去除率不足70%。5组COD/N湿地中氨氮（NH4+-N）的平均去除率依次为（61±16.6）%、（23±14.1）%、（30±12.5）%、（28±14.5）%和（74±7.0）%，在碳源充足或无碳源的条件下有利于NH4+-N的去除。除COD/N=0外，其余湿地中出水未检测到硝态氮（NO3--N）。湿地中总氮（TN）的去除变化与NH4+-N相似。5组湿地系统中，N2O的平均释放通量和累积排放量，分别在0.83~11.84 mg·（m2·h）-1和30.65~490.80 mg·m-2之间。COD/N=4的人工湿地系统中，N2O的平均释放通量和累计排放量显著高于其他处理（p2O形态去除的氮占系统去除TN的百分比为4.87%。COD/N对潜流人工湿地的脱氮和N2O减量具有调控作用。

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