水厂排泥水处理过程中会产生较大量的污泥脱水液。为避免南水北调引江水资源的浪费,同时积极推进水厂的“零排放”建设目标,面向以引江水为水源的超滤处理工艺,评价了将污泥脱水液回流至原水池进行稀释回用的可行性。考察了不同污泥脱水...水厂排泥水处理过程中会产生较大量的污泥脱水液。为避免南水北调引江水资源的浪费,同时积极推进水厂的“零排放”建设目标,面向以引江水为水源的超滤处理工艺,评价了将污泥脱水液回流至原水池进行稀释回用的可行性。考察了不同污泥脱水液/引江原水混合比例下超滤系统的运行特性,发现当污泥脱水液适当稀释后,其对超滤净水效果和膜污染的影响急剧降低,当稀释比例达到1∶800时,出水水质与跨膜压增长曲线已接近引江原水直接超滤的情况。试验中引江原水的跨膜压增长速率为19.7 k Pa/d,而污泥脱水液原液则达到25.8 k Pa/d。当两者以1∶800比例稀释后,跨膜压增长速率下降为21.3 k Pa/d,接近于引江原水。膜表面微观表征结果显示随着稀释比例的提高,滤饼层厚度、溶解性有机物、特征官能团红外峰强、污染元素相对质量分数均显著降低,逐渐下降到与原水直接超滤相近的水平。引江原水组的超滤膜滤饼层厚度为1.77μm,而污泥脱水液原液组的滤饼层厚度为4.00μm,污染程度较重。两者按1∶800比例稀释后的滤饼层厚度降低至1.82μm,污染程度显著降低。研究结果可为南水北调受水城市超滤水厂的“零排放”建设提供参考。但值得注意的是,污泥脱水液的合理处置与利用问题目前仍处于起步和探索阶段,未来仍需从水质生物安全性和化学安全性的角度加以系统评估。同时可考虑氧化、吸附、微滤分离等预处理手段,以提高污泥脱水液回用过程的安全性。展开更多
引江济汉工程渠首为典型“盲肠河段”,口门环流导致泥沙落淤,抬高引水口底板高程,影响渠道引水条件,因此需定期进行渠道进口清淤维护。为研究工程运行后渠首渠道输水输沙规律,采用河演分析及建立平面二维水沙数学模型方法研究表明:工程...引江济汉工程渠首为典型“盲肠河段”,口门环流导致泥沙落淤,抬高引水口底板高程,影响渠道引水条件,因此需定期进行渠道进口清淤维护。为研究工程运行后渠首渠道输水输沙规律,采用河演分析及建立平面二维水沙数学模型方法研究表明:工程自运行以来,口门存在逆时针回流,渠首呈累积性淤积态势,渠首未来10年泥沙淤积量约43.89万m³,研究结果可为工程管理单位进行工程运行、维护和改造提供技术支撑。The headwork of the Yangtze River to Han River Project is a typical “cecal reach”, and a circulating flow at the channel mouth causes sediment deposition and elevates the inlet, affecting the inlet flow condition. Therefore, regular dredging is necessary for the safety of the headwork. A two-dimensional flow sediment transport bed morphology mathematical model and the analysis method of fluvial process are adopted to analyze the law of water-sediment transport. Analysis shows that the headwork kept silting along with a counterclockwise backflow at the entrance. There will be 438,900 cubic meters sediment siltation in the next 10 years. The research can provide technical support for engineering operation, maintenance, and renovation for the project management.展开更多
三峡工程蓄水以来,沙市河段水沙过程发生明显变化,沿程水位特别是枯水位呈累积性下降趋势,引江济汉工程取水口位于沙市河段,沙市枯水位下降影响渠道引水条件,导致工程枯季取水需求难以保障。通过水文泥沙分析方法,分析了沙市站近50年水...三峡工程蓄水以来,沙市河段水沙过程发生明显变化,沿程水位特别是枯水位呈累积性下降趋势,引江济汉工程取水口位于沙市河段,沙市枯水位下降影响渠道引水条件,导致工程枯季取水需求难以保障。通过水文泥沙分析方法,分析了沙市站近50年水沙系列变化、同流量级下枯水位下降趋势,结合引江济汉工程自运行以来的引水调度情况,分析了沙市站枯水位下降对工程引水的影响及对策,可为工程运行管理单位进行工程运行、维护和改造提供技术支撑。Since the impoundment of the Three Gorges Reservoir (TGR), the water and sediment conditions of Shashi Reach have changed significantly, and the water levels, especially the low water levels have decreased obviously. The intake of the Yangtze River to Han River Project is located in the Shashi Reach, and the Shashi low water levels affect the project channel inlet flow condition, which makes the water intake demand barely guaranteed during the dry season. Hydrological analysis methods are adopted to analyze the changing rule of water and sediment processes and the decline trend of low water level in the Shashi Reach in the past 50 years. The influence and strategies of Shashi low water level decreasing on the Yangtze River to Han River Project are studied according to the channel diversion volume of the project, which can provide technical support for engineering operation, maintenance, and renovation for the project management.展开更多
文摘水厂排泥水处理过程中会产生较大量的污泥脱水液。为避免南水北调引江水资源的浪费,同时积极推进水厂的“零排放”建设目标,面向以引江水为水源的超滤处理工艺,评价了将污泥脱水液回流至原水池进行稀释回用的可行性。考察了不同污泥脱水液/引江原水混合比例下超滤系统的运行特性,发现当污泥脱水液适当稀释后,其对超滤净水效果和膜污染的影响急剧降低,当稀释比例达到1∶800时,出水水质与跨膜压增长曲线已接近引江原水直接超滤的情况。试验中引江原水的跨膜压增长速率为19.7 k Pa/d,而污泥脱水液原液则达到25.8 k Pa/d。当两者以1∶800比例稀释后,跨膜压增长速率下降为21.3 k Pa/d,接近于引江原水。膜表面微观表征结果显示随着稀释比例的提高,滤饼层厚度、溶解性有机物、特征官能团红外峰强、污染元素相对质量分数均显著降低,逐渐下降到与原水直接超滤相近的水平。引江原水组的超滤膜滤饼层厚度为1.77μm,而污泥脱水液原液组的滤饼层厚度为4.00μm,污染程度较重。两者按1∶800比例稀释后的滤饼层厚度降低至1.82μm,污染程度显著降低。研究结果可为南水北调受水城市超滤水厂的“零排放”建设提供参考。但值得注意的是,污泥脱水液的合理处置与利用问题目前仍处于起步和探索阶段,未来仍需从水质生物安全性和化学安全性的角度加以系统评估。同时可考虑氧化、吸附、微滤分离等预处理手段,以提高污泥脱水液回用过程的安全性。
文摘引江济汉工程渠首为典型“盲肠河段”,口门环流导致泥沙落淤,抬高引水口底板高程,影响渠道引水条件,因此需定期进行渠道进口清淤维护。为研究工程运行后渠首渠道输水输沙规律,采用河演分析及建立平面二维水沙数学模型方法研究表明:工程自运行以来,口门存在逆时针回流,渠首呈累积性淤积态势,渠首未来10年泥沙淤积量约43.89万m³,研究结果可为工程管理单位进行工程运行、维护和改造提供技术支撑。The headwork of the Yangtze River to Han River Project is a typical “cecal reach”, and a circulating flow at the channel mouth causes sediment deposition and elevates the inlet, affecting the inlet flow condition. Therefore, regular dredging is necessary for the safety of the headwork. A two-dimensional flow sediment transport bed morphology mathematical model and the analysis method of fluvial process are adopted to analyze the law of water-sediment transport. Analysis shows that the headwork kept silting along with a counterclockwise backflow at the entrance. There will be 438,900 cubic meters sediment siltation in the next 10 years. The research can provide technical support for engineering operation, maintenance, and renovation for the project management.
文摘三峡工程蓄水以来,沙市河段水沙过程发生明显变化,沿程水位特别是枯水位呈累积性下降趋势,引江济汉工程取水口位于沙市河段,沙市枯水位下降影响渠道引水条件,导致工程枯季取水需求难以保障。通过水文泥沙分析方法,分析了沙市站近50年水沙系列变化、同流量级下枯水位下降趋势,结合引江济汉工程自运行以来的引水调度情况,分析了沙市站枯水位下降对工程引水的影响及对策,可为工程运行管理单位进行工程运行、维护和改造提供技术支撑。Since the impoundment of the Three Gorges Reservoir (TGR), the water and sediment conditions of Shashi Reach have changed significantly, and the water levels, especially the low water levels have decreased obviously. The intake of the Yangtze River to Han River Project is located in the Shashi Reach, and the Shashi low water levels affect the project channel inlet flow condition, which makes the water intake demand barely guaranteed during the dry season. Hydrological analysis methods are adopted to analyze the changing rule of water and sediment processes and the decline trend of low water level in the Shashi Reach in the past 50 years. The influence and strategies of Shashi low water level decreasing on the Yangtze River to Han River Project are studied according to the channel diversion volume of the project, which can provide technical support for engineering operation, maintenance, and renovation for the project management.
