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Water hammer is one of the important factors which influence safety operation of long distance pressurized water transmission pipeline projects. The air valve set has fast air inflow velocity and slow exhaust velocity, which can effectively suppression water hammer of pressurized water delivery pipeline. This paper sets up the math model of hydraulic transients analysis on different install types...
Based on the physical and mechanical properties , experimental studies on rheological properties of micro-fine cement slurry are carried out. The influence law of water cement ratio and water reducing agent on the viscosity of micro-fine cement slurry are got. The time variation characteristic of viscosity and the influence of water reducing agent on it are also worked out in this paper.
Discharge matching of high lift conveyance cascade pumping station has great influence on safe and economic operation of the project. The main influencing factors of cascade pumping station discharge matching are water quality, performance changing of pumps during their operation, pump characteristic differences and system characteristic curve, etc. The discharge matching methods of cascade water...
The influences of pre-treatment temperature and time on bio-hydrogen production technology by anaerobic fermentation were studied in this paper, in order to provide basic data for quickening bio-hydrogen production technology. The results show that the best conditions are the temperature being 80°C, the time being 10min and the PH value being 5.5, and the highest hydrogen production rate is 1.36mol/mol-glucose...
Since humic acid from water causes considerable serious health-risk factors, powerful methods for the removal of those have received increasing attention over the past decade. In this paper, the available technologies for removal of humic acid from water are briefly reviewed, and the recent advancements are summarized. Fundamentals and main applications of typical methods such as filtration, flocculation...
Swimming bed combined with aerobic granular sludge as a novel technology for domestic sewage treatment was developed in this study, which was on the basis of the biofilm process and activated sludge process. The on-way variation of COD and NH4+-N was studied at different hydraulic retention time (HRT). The results show that the concentrations of COD and NH4+-N go down during the treatment flow, and...
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