Effects of pH, Temperature, Dissolved Oxygen, and Flow Rate on Phosphorus Release Processes at the Sediment and Water Interface in Storm Sewer.
Effects of pH, Temperature, Dissolved Oxygen, and Flow Rate on Phosphorus Release Processes at the Sediment and Water Interface in Storm Sewer.
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DOI：
10.1155/2013/104316
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发表时间：
2013
影响因子：
2.6
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Li H;Liu L;Li M;Zhang X
研究了pH、温度、溶解氧（DO）和流量对雨水管沉积物-水界面磷（P）释放过程的影响。2011年8月3日，在北京市西城区礼士北路的一个住宅雨水管道中进行了采样。在pH值为8 ~ 10范围内，随着pH值的增加，磷的释放速率增加。高温有利于磷的释放，溶解氧浓度降低，上覆水中总磷浓度升高。在0.7 m s-1 ~ 1.1 m s-1的流速范围内，随着流速的增加，上覆水中TP的浓度逐渐增加，然后趋于稳定。在本研究考察的所有因素中，流量是影响磷释放的主要因素。在高强度、短历时的降雨过程中，磷的累积释放量随管道径流过程的进行而增加。可采取有效的管理措施和低影响开发等措施，通过减缓流速来控制城市沉积物中磷的释放。
The effects of pH, temperature, dissolved oxygen (DO), and flow rate on the phosphorus (P) release processes at the sediment and water interface in rainwater pipes were investigated. The sampling was conducted in a residential storm sewer of North Li Shi Road in Xi Cheng District of Beijing on August 3, 2011. The release rate of P increased with the increase of pH from 8 to 10. High temperature is favorable for the release of P. The concentration of total phosphorus (TP) in the overlying water increased as the concentration of DO decreased. With the increase of flow rate from 0.7 m s−1 to 1.1 m s−1, the concentration of TP in the overlying water increased and then tends to be stable. Among all the factors examined in the present study, the flow rate is the primary influence factor on P release. The cumulative amount of P release increased with the process of pipeline runoff in the rainfall events with high intensities and shorter durations. Feasible measures such as best management practices and low-impact development can be conducted to control the P release on urban sediments by slowing down the flow rate.
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