响应面法及粒度分析法优化城市再生水回用于电厂的预处理

Response Surface Method and Particle Size Analysis Method for Optimizing Pretreatment of Urban Reclaimed Water Reuse in Power Plants

针对浙能阿克苏热电有限公司的生产用水预处理效果不显著问题,选取混凝剂加药量、澄清时间和搅拌速度作为影响因子,使用响应面设计软件Design Expert10.0进行拟合,得到最佳实验条件为混凝剂加药量230 mg/L、澄清时间53 min、搅拌速度95 r/min,此时最高浊度去除率为95.60%,水中浊度小于0.5 NTU;同时通过粒度分布法研究不同影响因子对颗粒沉降速率的影响,得出增大混凝剂加药量、延长澄清时间、设置搅拌时间为30 s可以显著增大水中颗粒的中值粒径,进而提高沉降速度,同时得出搅拌速度对颗粒中值粒径的影响不明显。电厂可以通过综合评定来进一步确定混凝过程参数的设定值,以提高生产用水混凝澄清处理的效率。

In response to the issue of insignificant pre-treatment effect of production water at Zheneng Aksu Thermal-Power Co.,Ltd.,select the dosage of coagulant,clarification time,and stirring speed as influencing factors.Response surface design software Design Expertl0.0 is used for fitting,and the optimal experimental conditions are obtained as follows:dosage of coagulant is 230 mg/L,clarification time is 53 minutes,stirring speed is 95 r/min.At this time,the highest turbidity removal rate is 95.60%,and the turbidity in water is less than 0.5 NTU.At the same time,the particle size distribution method is used to study the influence of different influence factors on the particle sedimentation rate,and it is concluded that increasing the coagulant dosage,increasing the clarification time,and setting the stirring time at 30 s can significantly increase the median particle size of particles in water,thus increasing the sedimentation rate.Meanwhile,it is also concluded that the mixing speed has no obvious effect on the median particle size.The power plant can further determine the setting value of coagulation process parameters through comprehensive assessment to improve the efficiency of coagulation and clarification treatment for production water.