典型城市河道自凈能力研究與模擬
發(fā)布時間：2019-05-12 06:36
【摘要】：隨著城市化的快速發(fā)展,城市內(nèi)河受到嚴(yán)重破壞,污染嚴(yán)重,自凈能力低下,水環(huán)境治理迫在眉睫,要實現(xiàn)水環(huán)境生態(tài)修復(fù)就要恢復(fù)和增強(qiáng)水體的自凈能力。但是城市內(nèi)河污染物來源復(fù)雜而分散,自凈能力(容量)的界定較為困難。要實現(xiàn)城市內(nèi)河自凈能力的合理開發(fā)利用,實現(xiàn)水體生態(tài)修復(fù),就要利用人工措施或水利工程來提升水體的自凈容量。在國內(nèi)外實施的眾多城市河道治理工程中,治理的效果往往不可預(yù)料。這就需要水環(huán)境模型來對治理效果進(jìn)行模擬,以此對后續(xù)的治理工作進(jìn)行指導(dǎo)和方案優(yōu)化,并對工程效果進(jìn)行后評估,從而達(dá)到推廣工程技術(shù)經(jīng)驗的目的。本文以蘇州官瀆花園內(nèi)河為研究對象,通過室內(nèi)和室外模擬實驗,測定相應(yīng)的自凈參數(shù),研究了人工水力循環(huán)、人工強(qiáng)化復(fù)氧和滲濾凈化裝置等不同工程措施下水體自凈能力的變化情況。然后根據(jù)實際情況建立了水質(zhì)模型,以實驗所得的自凈參數(shù)為依據(jù),對水體中的NH3-N、CODcr、TP的變化情況進(jìn)行模擬,并與實測值進(jìn)行驗證,以此對工程措施實施后的效果進(jìn)行預(yù)測,結(jié)果表明:通過人工水力循環(huán)、人工強(qiáng)化復(fù)氧和滲濾凈化裝置等工程措施,能增強(qiáng)水體的自凈能力。建立的水質(zhì)模型基本上能很好地反映出研究區(qū)域內(nèi)水質(zhì)變化情況,模擬結(jié)果的確定性系數(shù)較好,均在0.7以上。由模擬預(yù)測結(jié)果可知,工程措施可以改善官瀆內(nèi)河水質(zhì)情況,對污染負(fù)荷如NH3-N、CODcr、TP等都有一定程度的削減,與后續(xù)跟蹤監(jiān)測一致。在旱季,人工水力循環(huán)的削減量:CODcr為6.8%,NH3-N為9.8%,TP為10.1%;人工強(qiáng)化復(fù)氧的削減量:CODcr為4.2%,NH3-N為6.3%,TP為17.8%;滲濾凈化裝置的削減量:CODcr為12.3%,NH3-N為18.9%,TP為9.5%;綜合整治工程削減量最高:CODcr為15.7%,NH3-N為29.8%,TP為21.3%。在雨季,削減量基本上都較旱季有所提升,其中人工水力循環(huán)的削減量:CODcr為31.5%,NH3-N為22.1%,TP為17.3%;人工強(qiáng)化復(fù)氧:CODcr、NH3-N和TP的削減量分別為23.5%、16.7%和18.9%;滲濾凈化裝置:CODcr、NH3-N及TP的削減量分別為41.3%,43.5%和10.2%;綜合整治工程:CODcr、NH3-N及TP的削減量分別為11.2%,52.4%和14.7%。CODcr的削減量最高值(41.3%)出現(xiàn)在雨季的滲濾凈化裝置下,NH3-N的削減量最大值(52.4%)則出現(xiàn)在雨季的綜合整治工程下;TP的削減量最大值(21.3%)則是在旱季的綜合整治工程條件下。綜上所述,工程措施實施后可以提升內(nèi)河水體自凈能力,能在一定程度上削減污染負(fù)荷(NH3-N、CODcr、TP)。其中,內(nèi)河綜合整治工程在旱季就可以完成所有污染物的有效削減。為實現(xiàn)綜合生態(tài)修復(fù)工程的長效維持,后期應(yīng)定期對水質(zhì)進(jìn)行跟蹤監(jiān)測。
[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，
本文編號：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，
本文編號：2475182
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