This project belongs to the application research of high-efficiency water purification, low-energy operation and land-saving technologies in the field of urban water supply, including the optimization of traditional high-efficiency water purification processes and the research and development and demonstration application of key technologies such as multi-unit high-efficiency and low-consumption combinations. The main content of this project is aimed at the traditional high-efficiency precipitation and filtration processes in my country's water purification process, which have low uniformity of centralized and distributed water, low stability of sludge discharge, poor backwashing effect, as well as long connection process and energy consumption of multi-unit process combinations. Three major common problems, including high water consumption and large land occupation, are focused on double-layer advection sedimentation, double-layer filter material filtration and multi-process unit combination in traditional high-efficiency precipitation and filtration processes, and optimized through numerical simulation, Scientific and technological means such as pilot test verification and technical and economic analysis have carried out uniform collection and distribution of water between layers of double-layer advection sedimentation tanks and low-disturbance reduction sludge discharge, double-layer filter material backwashing of non-mixed layers and drainage dead zones, and multi-process units. Several special studies such as efficient combination of space and ultra-high-wall concrete construction have innovated traditional high-efficiency water purification and multi-process unit combination technologies, achieved the goals of reliability, stability, efficiency and low consumption, and carried out demonstration applications. The following key technologies and innovative achievements have been formed and achieved: (1) Double advection precipitation technology coupled with uniform water collection and distribution, low disturbance and low sludge discharge. In view of the technical problems such as the difficulty of uniformly collecting and distributing water in double-layered advection sedimentation tanks with high space utilization and small area occupation, the difficulty of sludge discharge easily interfering with the stability of effluent water quality, and the large amount of sludge discharged by the advection sedimentation tanks, the CFD simulation study with the main objects of floc concentration characteristics and particle size distribution determined the main characteristics of the double-layered sedimentation tank type, such as the optimal width-depth ratio, double-layered ratio, and efficient water collection and distribution technology, and proposed a low-disturbance reduction technology for sludge discharge to achieve significant improvement in the effluent water quality of the sedimentation tank. Both sludge reductions should be no less than 20%. (2) No flushing and drainage dead zone, no mixed layer and double filter material filtration technology. Focusing on the technical problems of the new double-layer filter (inverted plate filter) with strong interception capacity, low flushing water consumption, and low filter material loss during flushing, such as mixed layers of filter materials and dead zones of backwashing water drainage, pilot studies such as flushing methods, filter material expansion, and filter material interception and penetration have been carried out, revealing the changing laws of filter layer operation and flushing, and developing a patented technology to eliminate the dead zones of backwashing water drainage, which has completely solved the negative impact of the double-layer filter material filter on the reduction of interception efficiency after flushing. The filtration cycle has been more than doubled, and backwashing dead zones and mixed layers have been comprehensively eliminated. (3) Long-process multi-unit high-efficiency and low-consumption combined water purification process technology. Based on the large demand for land, energy consumption, and water consumption caused by the increase of units and processes during the upgrading of water plants 'processes, the organic combination of multi-unit spaces and processes, thin-walled ultra-high concrete construction and ultra-long concrete crack control technology are key breakthroughs. We have developed multi-form and multi-space combination process technologies including sedimentation filtration, advanced treatment and sludge treatment. The construction land index is 50% lower than the national standard, and the process head loss is reduced by 23%. Operating water consumption is reduced by more than 20% based on the same type of process. At the same time, engineering material costs, land acquisition fees, foundation treatment fees and construction period have all been significantly reduced. The results of this project have had an important impact on the construction and operation of water supply projects. Authorized 26 invention patents, published 31 papers in domestic core journals, and included 3 papers in SCI (cited 17 times). Among them, the special process research won the first prize for scientific and technological progress by the Ningxia Water Resources Department. The project results have been successfully applied to representative areas in my country. Large-scale water supply projects such as Ningxia Ningdong Chemical Base Phase II, Lhasa Najin Water Plant, Shanghai Fengxian No. 3 Water Plant, Qingdao Baisha River Water Plant, Hangzhou Xiaoshan No. 3 Water Plant, etc. The projects that have been put into operation save more than 373 acres of land area, save 2.3 million yuan in operating power consumption every year, and save 1.1 million cubic meters of water consumption every year. The economic benefits of the project exceed 2.5 billion yuan, and the social benefits are very significant.