不同补水方式下翠湖沉积物氮磷释放特性研究  

Characteristics of Nitrogen and Phosphorus Release from Urban Water Sediment of Cuihu Lake Regarding Different Water Replenishment Approaches

作　　者：郭红兵[1] 陈荣[1] 王晓昌[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《环境科学与技术》2016年第2期18-23,30,共7页Environmental Science & Technology

基　　金：水污染控制与治理科技重大专项子课题(2012ZX07313001-002);陕西省青年科技新星项目(2013KJXX-55);西安市科技计划项目(CX12160)

摘　　要：城市水体不同于流域水体,其补水来源与城市发展和水资源供给量密切相关,补水水源在一段时间内发生变化是城市水体的典型特点。为了更好地揭示富营养化城市水体沉积物在不同补水方式(自来水、再生水和湖水)下內源营养物的释放特性,通过实验模拟了静态和动态(水体扰动)条件下的底泥释放过程。结果表明:(1)自来水补给下的上覆水TN、TP浓度表现为初期快速上升,后期保持相对平稳的趋势;再生水与湖水补给的上覆水初期TN、TP浓度短时间内快速下降到一定程度后处于动态平衡。(2)动态条件下底泥的TN、TP释放量均高于静态条件,水力扰动有助于底泥內源营养物释放。(3)采用物料平衡方法对底泥中营养物的释放总量进行计算,结果显示,以自来水为补水的动态反应器中TN和TP的释放量最大,TN在以再生水为补水的静态反应器中释放量最小,TP在以再生水为补水的动态反应器中释放量最小。研究成果对城市水体富营养化控制和补水水源的优化配置具有指导意义。The urban water bodies are greatly different from the large waters. The source of urban water replenishment is closely associated with the urban development and the supply of water sources, thus the typical characteristic of urban water bodies is described as the variation of water replenishing sources over a period of time. In order to better reveal the behaviour of nutrients accumulation and release in the sediment of an eutrophic urban water body regarding different water replenishing sources such as tap water, reclaimed water and surface water, the sediment release process was simulated under static and dynamic conditions（hydraulic disturbance）. Results showed that the concentration of TN and TP in the overlying water replenished by the tap water is performed in rapid rise in the innitial period, and later remain in relatively stable tendency.While the concentration of TN and TP in the overlying water replenished by the reclaimed water and the surface water rapidly drop to a certain level in a short period of time and then remain in dynamic balance. As hydraulic disturbance could contribute to the release of endogenous nutrient in the sediment, the release quantity of TN and TP under the condition of dynamic experiment was higher than the amount obtained from static condition. Based on the material balance method, the total release amount of nutrients in the sediment were calculated. The results showed that the release amount of TN and TP in the dynamic reactor which was replenished by the tap water reached the maximum, while the release amount of TN in the static reactor and TP in the dynamic reactor were the minimum regarding reclaimed water replenishment. The results of this research can provide an significant guidance for controlling the eutrophication of urban water bodies and thus assist in optimal allocation of water replenishing sources.

关 键 词：城市水体 底泥释放 营养物(N、P) 不同补水方式 动态实验 

分 类 号：X52[环境科学与工程—环境工程]