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Cyclic Activated Sludge Process (CASS) as an area of provincial , easy expansion , etc., has been widely used in industrial and domestic sewage treatment works . Since the design is not quite reasonable operating parameters selected , combined in different countries in different regions and even domestic wastewater parameters larger difference causes the runtime power consumption and other operating costs can not be too high or sewage discharge standards . In this paper, numerical simulation approach can be more accurately determine the optimal wastewater treatment plant run programs to achieve effluent discharge standards. West of Chengdu Hi-tech sewage treatment plant as the research object , using BioWin3.0 sewage treatment sewage treatment plant simulation software for the modeling and numerical simulation of its operation research . One day in the plant 's actual inflow data, for example , the initial analog display , CASS except TP pool water quality , are consistent with the actual water . Through the model parameter sensitivity analysis showed that the model that affect water quality model parameters were 12 . Adjust the model kinetic parameters PAOs maximum specific growth rate (u maxPAO ), P limit the maximum specific growth rate (u maxP-limited ), half saturation rate constant ( K s, PAO ), phosphorus half saturation limit rate constant (K s, p-limited ) and 0.25 , respectively 1,0.5,0.2 , stoichiometry parameter PHA yield (Y P / PHA, seq ) of 0.95 , the model can simulate the actual sewage treatment plant operation . In actual operation , to find a suitable process operating parameters, in the sewage discharge standards under the premise of making the lowest energy consumption and other operating costs to run the sewage plant optimization inevitable choice . The effects of different conditions influencing factors CASS tank effluent and process optimization operational measures for different water temperature, reflux ratio , ratio and drainage conditions, numerical simulation cycle study found a cycle time of 4h ( water, aeration 1.5h, precipitation 1.5h, decanter 1h), sludge retention time (SRT) 14d, was refluxed for less than 20 % and the minimum ratio of 65% drainage , at room temperature to achieve optimum water and the lowest energy consumption. The operating conditions of the subsequent treatment can effectively reduce the difficulty and the added amount of chemical reduction . Also gives low-temperature conditions to ensure water runs compliance strategy .
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