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Study on Design Theory of Vacuum Drainage in the Drainage System

Author: ChenLiQin
Tutor: ZhangQin
School: Chongqing University
Course: Municipal Engineering
Keywords: Vacuum drainage system Composition requirements Applications Economic Analysis System design parameters
CLC: TU823
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
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Abstract

Vacuum drainage system is a new kind drainage system. Compared to conventional gravity drainage system, it has advantage of environmental protection, water conservation, etc. It frees from the limitations of gravity drainage system for slope and made pipeline more flexibly during the pipeline construction. Vacuum drainage system has been widely used in some Western developed countries, but can’t be replicated in the country due to economic, technical and other reasons.The vacuum drainage system is the use of air pressure difference to transport sewage. Firstly, the composition of the requirements of the system studied, for example, the location of pump station, request of pumps, vacuum tanks and sewage pumps, and the like in pump station, laying methods tube network, vacuum well and their accessories collection requirements to be met. Vacuum drainage system as a new kind drainage system, compared with the traditional gravity drainage method has many advantages, has wide range of applications. This paper also studied the main drainage systems of vacuum applications. The economic benefit of the vacuum drainage system is a prerequisite for application of the system. The article uses cost-benefit analysis to analyze one vacuum community ecological sanitation project in a city in northern China, and compares vacuum drainage system and on the same scale with the traditional gravity drainage system. The economic net present value of the vacuum drainage system more than conventional gravity drainage system, when the social discount rate is 8%, Therefore, from an economic point of analysis, the vacuum drainage system in our country is feasible.Design calculation of pipe network of a vacuum drainage system is a key part.The article in-depth study flow, pressure loss, gas-liquid ratio, flow rate and maximum transmission pipeline from the sewage pipe network, such as design parameters. For general residential area can be designed calculation method of sewage discharge, but for sanitary ware used for the high frequency in public places, it is better to calculate flow using the frequency of sanitary ware. The losses of vacuum drainage system include enhance static pressure loss and friction loss. Gas liquid ratio of vacuum drainage system is estimated by occupant density along the length of the main pipe. Calculated by the Bernoulli equation the maximum flow of sewage should be 4.5 ~ 5.5m / s, the average flow rate of water 1.3 ~ 2.4m / s. Used promoted step by step in the vacuum pipe system step by step, the sewage transmission distance up to about as far as 3000m. Then, the article studies the calculation of selection for vacuum pump, vacuum tank, sewage pumps and other equipment in pump station. Rotary vane vacuum pump with energy-efficient, the characteristics of extreme high vacuum, and circulating water temperature is too high will not result in cavity and reduce efficiency, so recommended.Finally, according to computational theory of vacuum drainage system which is related above, the article examples design and calculation of the vacuum drainage system for one conference center

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