Research On Energy Conservation Design Of Vacuum Sanitation System

Traditional water-flushing based sanitation systems use about8-12L of water each time of using. The problem is not only too much water it wastes, but also the environment is severely polluted by such a system. Meanwhile, useful materials in the human excreta such as N, P, K are hard to recycle. The vacuum sanitation system which is widely used on the airplanes and high speed railways has many advantages. It uses as less as0.6～1.2L of water each time of use. And it works in a closed environment so that excreta can be disposed bio-safely. The vacuum is generated in the excreta tank by the vacuum pump. The relative air pressure between the pipe and the toilet forces the excreta into the excreta tank. The primary energy consumption of the vacuum sanitation system is the produce of vacuum. So reduce the use of vacuum could directly reduce the energy consumption.However, a significant portion of the energy consumed by the present vacuum sanitation systems is wasted due to improper settings of the same propulsive force for different amount of excreta. In respect that designers of current systems did not consider the difference in energy supply to collect different amount of excreta. To improve the energy efficiency, this research proposes an energy conservation designed in vacuum sanitation systems based on the amount of excreta.In this new design, the sewerage force is adjusted due to the amount of excreta. Theoretical research and experimental study are carried out on the composition of energy-saving vacuum sanitation systems. The measurement of excreta amount and the adjustment of sewerage force are studied. Finally, the electrical control sub-system of this energy-saving vacuum sanitation system is designed by using the embedded system.