基于响应曲面法优化污泥PAC调理的搅拌参数

摘要

Using PAC as conditioner, capillary suction time ( CST) value and sludge volume index ( SVI) as response value to represent sludge dewatering performance and sedimentation performance.Using response surface method to evaluate the influence of stirring parameters for the performance of sludge dewatering and sedimentation, to research the stirring parame-ters and the interaction between parameters under PAC conditioning, to optimize the stirring parameters and establish the mathematical model between CST ( SVI) and the stirring param-eters and make energy evaluations of the mixing parameters.Stirring parameters including:the first stirring intensity(time),the second stirring intensity( time).The results indicated that the first stirring parameters and the interaction of the mixing parameters play important roles in excess sludge conditioning, but there were significant differences in stirring parame-ters.Satisfactory prediction model were derived by response surface methodology, the experi-mental value agree with the predicted value with 1.91%deviation.The best stirring parame-ters of using PAC as a conditioner in excess sludge:200 r/min, 40 s, 60 r/min, 9min.Fur-thermore, making economic evaluations of the mixing parameters, the energy consuming was low when choosing the best stirring parameters.%使用聚合氯化铝(PAC)作为调理剂,以污泥毛细吸水时间(CST)和污泥容积指数(SVI)分别表征污泥调理后的脱水性能和沉降性能,运用响应曲面法考察剩余污泥PAC调理过程中动力学搅拌参数对污泥脱水性能和沉降性能影响规律,分析各搅拌参数及其交互作用对污泥化学调理效能的影响,优化污泥PAC调理的动力学搅拌参数建立CST、SVI关于动力学搅拌参数的数学模型,并对搅拌参数进行耗能评价.本研究中的动力学搅拌参数包括:第一级搅拌强度(时间),第二级搅拌强度(时间).研究结果表明,第一级搅拌参数对污泥脱水性能和沉降性能影响较强;搅拌参数交互作用对污泥的脱水性能和沉降性能存在显著影响,但对于污泥脱水性能和沉降性能各自起主要交互作用的搅拌参数存在显著区别;数学模型回归性较好,与预测值相比最大偏差为1.91%,剩余污泥PAC调理的最佳动力学搅拌参数:200 r/min,40 s,60 r/min,9 min;对各组搅拌参数进行经济性评价,选择最佳搅拌参数进行污泥调理时耗能较低.