典型城市河道自净能力研究与模拟
发布时间：2019-05-12 06:36
【摘要】：随着城市化的快速发展,城市内河受到严重破坏,污染严重,自净能力低下,水环境治理迫在眉睫,要实现水环境生态修复就要恢复和增强水体的自净能力。但是城市内河污染物来源复杂而分散,自净能力(容量)的界定较为困难。要实现城市内河自净能力的合理开发利用,实现水体生态修复,就要利用人工措施或水利工程来提升水体的自净容量。在国内外实施的众多城市河道治理工程中,治理的效果往往不可预料。这就需要水环境模型来对治理效果进行模拟,以此对后续的治理工作进行指导和方案优化,并对工程效果进行后评估,从而达到推广工程技术经验的目的。本文以苏州官渎花园内河为研究对象,通过室内和室外模拟实验,测定相应的自净参数,研究了人工水力循环、人工强化复氧和渗滤净化装置等不同工程措施下水体自净能力的变化情况。然后根据实际情况建立了水质模型,以实验所得的自净参数为依据,对水体中的NH3-N、CODcr、TP的变化情况进行模拟,并与实测值进行验证,以此对工程措施实施后的效果进行预测,结果表明:通过人工水力循环、人工强化复氧和渗滤净化装置等工程措施,能增强水体的自净能力。建立的水质模型基本上能很好地反映出研究区域内水质变化情况,模拟结果的确定性系数较好,均在0.7以上。由模拟预测结果可知,工程措施可以改善官渎内河水质情况,对污染负荷如NH3-N、CODcr、TP等都有一定程度的削减,与后续跟踪监测一致。在旱季,人工水力循环的削减量:CODcr为6.8%,NH3-N为9.8%,TP为10.1%;人工强化复氧的削减量:CODcr为4.2%,NH3-N为6.3%,TP为17.8%;渗滤净化装置的削减量:CODcr为12.3%,NH3-N为18.9%,TP为9.5%;综合整治工程削减量最高:CODcr为15.7%,NH3-N为29.8%,TP为21.3%。在雨季,削减量基本上都较旱季有所提升,其中人工水力循环的削减量:CODcr为31.5%,NH3-N为22.1%,TP为17.3%;人工强化复氧:CODcr、NH3-N和TP的削减量分别为23.5%、16.7%和18.9%;渗滤净化装置:CODcr、NH3-N及TP的削减量分别为41.3%,43.5%和10.2%;综合整治工程:CODcr、NH3-N及TP的削减量分别为11.2%,52.4%和14.7%。CODcr的削减量最高值(41.3%)出现在雨季的渗滤净化装置下,NH3-N的削减量最大值(52.4%)则出现在雨季的综合整治工程下;TP的削减量最大值(21.3%)则是在旱季的综合整治工程条件下。综上所述,工程措施实施后可以提升内河水体自净能力,能在一定程度上削减污染负荷(NH3-N、CODcr、TP)。其中,内河综合整治工程在旱季就可以完成所有污染物的有效削减。为实现综合生态修复工程的长效维持,后期应定期对水质进行跟踪监测。
[Abstract]:With the rapid development of urbanization, the urban inland waterway has been seriously damaged, the pollution is serious, the self-purification ability is low, and the water environment treatment is imminent. In order to realize the ecological restoration of the water environment, it is necessary to restore and enhance the self-purification ability of the water body. However, the sources of urban inland river pollutants are complex and scattered, so it is difficult to define the self-purification capacity (capacity). In order to realize the rational development and utilization of urban inland river self-purification ability and realize the ecological restoration of water body, artificial measures or water conservancy projects should be used to improve the self-purification capacity of water body. In many urban river regulation projects carried out at home and abroad, the effect of regulation is often unpredictable. This requires the water environment model to simulate the treatment effect, so as to guide and optimize the subsequent treatment work, and carry on the post-evaluation to the engineering effect, so as to achieve the purpose of popularizing the engineering technical experience. In this paper, the inland river of Guandu Garden in Suzhou is taken as the research object, and the corresponding self-purification parameters are measured through indoor and outdoor simulation experiments, and the artificial hydraulic cycle is studied. Changes of self-purification ability of water body under different engineering measures, such as artificial reoxidation and percolation purification device. Then the water quality model is established according to the actual situation. Based on the self-purification parameters obtained from the experiment, the change of NH3-N,CODcr,TP in water body is simulated and verified with the measured value. The results show that the self-purification ability of water body can be enhanced by artificial hydraulic circulation, artificial strengthening reoxidation and filtration purification device and other engineering measures. The established water quality model can basically reflect the change of water quality in the study area, and the deterministic coefficient of the simulation results is better, all of which are above 0.7. From the simulation and prediction results, it can be seen that the engineering measures can improve the water quality of Guandu inland river, and reduce the pollution load such as NH3-N,CODcr,TP to a certain extent, which is consistent with the follow-up monitoring. In dry season, the reduction of artificial hydraulic cycle was 6.8% for CODcr, 9.8% for NH 3 N, 10.1% for TP, 4.2% for CODcr, 6.3% for NH 3 N and 17.8% for TP, respectively. The reduction of CODcr, NH _ 3 / N and TP was 12.3%, 18.9% and 9.5%, respectively, and the highest reduction in comprehensive treatment works was 15.7% for CODcr, 29.8% for NH _ 3 / N and 21.3% for TP. In the rainy season, the reduction is basically higher than that in the dry season, in which the reduction of artificial hydraulic cycle is 31.5% in CODcr, 22.1% in NH _ 3 鈮，
本文编号：2475182
[Abstract]:With the rapid development of urbanization, the urban inland waterway has been seriously damaged, the pollution is serious, the self-purification ability is low, and the water environment treatment is imminent. In order to realize the ecological restoration of the water environment, it is necessary to restore and enhance the self-purification ability of the water body. However, the sources of urban inland river pollutants are complex and scattered, so it is difficult to define the self-purification capacity (capacity). In order to realize the rational development and utilization of urban inland river self-purification ability and realize the ecological restoration of water body, artificial measures or water conservancy projects should be used to improve the self-purification capacity of water body. In many urban river regulation projects carried out at home and abroad, the effect of regulation is often unpredictable. This requires the water environment model to simulate the treatment effect, so as to guide and optimize the subsequent treatment work, and carry on the post-evaluation to the engineering effect, so as to achieve the purpose of popularizing the engineering technical experience. In this paper, the inland river of Guandu Garden in Suzhou is taken as the research object, and the corresponding self-purification parameters are measured through indoor and outdoor simulation experiments, and the artificial hydraulic cycle is studied. Changes of self-purification ability of water body under different engineering measures, such as artificial reoxidation and percolation purification device. Then the water quality model is established according to the actual situation. Based on the self-purification parameters obtained from the experiment, the change of NH3-N,CODcr,TP in water body is simulated and verified with the measured value. The results show that the self-purification ability of water body can be enhanced by artificial hydraulic circulation, artificial strengthening reoxidation and filtration purification device and other engineering measures. The established water quality model can basically reflect the change of water quality in the study area, and the deterministic coefficient of the simulation results is better, all of which are above 0.7. From the simulation and prediction results, it can be seen that the engineering measures can improve the water quality of Guandu inland river, and reduce the pollution load such as NH3-N,CODcr,TP to a certain extent, which is consistent with the follow-up monitoring. In dry season, the reduction of artificial hydraulic cycle was 6.8% for CODcr, 9.8% for NH 3 N, 10.1% for TP, 4.2% for CODcr, 6.3% for NH 3 N and 17.8% for TP, respectively. The reduction of CODcr, NH _ 3 / N and TP was 12.3%, 18.9% and 9.5%, respectively, and the highest reduction in comprehensive treatment works was 15.7% for CODcr, 29.8% for NH _ 3 / N and 21.3% for TP. In the rainy season, the reduction is basically higher than that in the dry season, in which the reduction of artificial hydraulic cycle is 31.5% in CODcr, 22.1% in NH _ 3 鈮，
本文编号：2475182
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