• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nitrogen >Intra- and Inter-Annual Variability in the Dissolved Inorganic Nitrogen in an Urbanized River before and after Wastewater Treatment Plant Upgrades: Case Study in the Grand River (Southwestern Ontario)
【24h】

Intra- and Inter-Annual Variability in the Dissolved Inorganic Nitrogen in an Urbanized River before and after Wastewater Treatment Plant Upgrades: Case Study in the Grand River (Southwestern Ontario)

机译：在污水处理厂升级之前和之后城市化河流中溶解无机氮的溶解无机氮中的血液间变异性：在大河（安大略省西南部）案例研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

External nitrogen (N) inputs originating from human activities act as essential nutrients accumulation in aquatic ecosystems or it is exported elsewhere, where the assimilation capacity is surpassed. This research presents a multi-annual case study of the dissolved inorganic nitrogen (DIN) in an urban river in Ontario (Canada), assessed changes in N downstream of the largest wastewater treatment plant (WTP) in the watershed. Changes in the DIN effluent discharge, in-river concentrations and loads were observed comparing the intra- and inter-annual variability (2010–2013) before, during and after WTP upgrades. These upgrades reduced the ammonium concentration in the river from 0.44 to 0.11 mg N-NH4+/L (year average), but the N load in the effluent increased. In the river, nitrate and ammonium concentrations responded to seasonal variability, being higher during the low temperature (10 °C) and high flow seasons (spring and spring melt). Among years, changes in the DIN concentration are likely controlled by the effluent to river dilution ratio, which variability resides on the differences in river discharge between years. This suggest that the increasing trend in the DIN concentration and loads are the result of agricultural and urban additions, together with reduced N assimilation, in addition to N loads responding to variable river discharge. Finally, we propose monitoring both concentrations and loads, as they provide answers to different questions for regulatory agencies and water managers, allowing tailored strategies for different purposes, objectives and users.
机译：源自人类活动的外部氮气（N）投入作为水生生态系统中的基本营养素积累，或者在其他地方出口，同化能力超越。本研究提出了对安大略省（加拿大）的城市河流中溶解无机氮（DIN）的多年案例研究，评估了流域中最大的废水处理厂（WTP）下游的N.观察到DIN流出物放电，河流浓度和载荷的变化，比较了在WTP升级之前，期间和之后的年度年间变异性和年间变异性（2010-2013）。这些升级将河流中的铵浓度从0.44减少到0.11mg N-NH4 + / L（平均值），但流出物中的N负载增加。在河流中，硝酸盐和铵浓度应对季节性变异性，在低温（＆ 10°C）和高流量季节（弹簧和弹簧熔体）中更高。多年来，DIN浓度的变化可能受到河流稀释比率的流出物的控制，可变异性在于河流在几年之间的差异。这表明DIN浓度和负荷的日益趋势是农业和城市增加的结果，除了N负载对可变河流放电的N负载之外，还与N同化减少。最后，我们建议监测浓度和负荷，因为它们为监管机构和水管理人员提供了不同问题的答案，允许针对不同目的，目标和用户定制的策略。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号