Introduction of vacuum drainage
The vacuum drainage system is formed by vacuum pump in the closed drainage pipe network. Through the vacuum diaphragm valve in each collection lifter, the pressure difference generated by vacuum negative pressure is used to realize the sewage flow to the sewage tank, and finally to the municipal sewage pipe network or sewage treatment equipment, which belongs to the pressure flow drainage system.
Comparison between vacuum drainage and gravity flow drainage
Comparison program | Traditional gravity sewage system | Vacuum blowdown system |
Design | Limited by hydraulic gradient, it is difficult to lift sewage, or it is necessary to lift pumps and structures Inconvenient design in the same floor drainage design | Vacuum suction, not affected by gravity, can lift sewage at will Drainage pipeline can be arranged as required, flexible and changeable |
Pipe diameter | Large diameter, high cost and large-scale excavation Slow flow rate and easy scaling Pipeline laying takes up a large space and cannot bypass obstacles at will Deep excavation of pipe trench, long construction period, great difficulty and high cost | The vacuum pipe diameter is small, usually 50-200mm, which can be made of PVC or PE with low cost Fast flow rate, self flushing ability, not easy to scale The pipeline can be laid flexibly, the direction is not limited by the terrain, and the obstacles can be easily bypassed Shallow buried depth, small construction earthwork, simple and economic construction |
Install and repair | Complicated installation, large quantities of work and imperceptible leakage | The installation is relatively small and the maintenance is simpler. The pipeline is in a vacuum state and there is no leakage of transmission medium |
Odor problem | The pipe network system is semi open, with poor sealing performance, odor escaping, breeding mosquitoes and flies | The pipe network is negative pressure and completely closed, and the odor will not escape |
Reconstruction of existing buildings | Difficult construction, high investment and long construction period | Easy to expand, easy to construct and short construction period |
Application of vacuum drainage system
Compared with the traditional gravity drainage system, the vacuum drainage system not only can effectively save water and protect the water environment, but also has the advantages of the pipe network not limited by the terrain, convenient installation, not easy to block, relatively small pipe diameter, good economic performance and so on.
Application of indoor vacuum drainage
Fixed space: underground commercial space, subway, environmental toilet, shopping mall / office building, commercial reconstruction, old urban reconstruction.
Mobile space: train, high-speed rail, ship, offshore oil drilling platform, container barracks, etc.
Outdoor vacuum drainage application
Water source protection area, rural sewage collection, villa sewage collection, industrial zone sewage collection, river sewage treatment, etc.
