强化混凝去除尖针杆藻的优化

Optimization Analysis on the Removal of Synedra Acus by Enhanced Coagulation

针对水源水藻类(优势藻为硅藻中的针杆藻)爆发问题,通过对比PAFS、PAC、PFC 3种混凝剂的除藻除浊效果,选取PAFS为最佳混凝剂;通过添加预氧化剂和助凝剂强化混凝除藻效果,结果表明使用助凝剂PDMDAAC对PAFS的助凝效果最好,其余药剂结合PAFS的除藻效果为PPC>ClO2>PAM>H2O2>HCA-1。用Box-Behnken Design(BBD)实验原理设计实验,研究pH值、搅拌速度、搅拌时间3因素对PAFS+PDMDAAC除藻效果的影响及最优除藻条件。结果表明:3因素对除藻的影响显著,且其显著程度为pH值>搅拌速度>搅拌时间,而3因素的交互影响对除藻的影响不太显著;强化混凝的最优条件为pH值为7.5、搅拌速度为75r/min、搅拌时间为15min,其除藻率为98.75%。

According to the algae outbreak （the dominant species was synedra acus belonging to Diatoms） in source water, the effects of PAFS, PAC, and PFC coagulants on algae removal and turbidity removal were compared. PAFS was chosen as the optimal coagulant. In addition, different pro-oxidations and coagulant aids were added to enhance flocculation removal effects of algae. The experimental results show that PDMDAAC combined with PAFC shows the best effect, and the order of other promoting coagulation effect was PPC ~ C102 ~ PAM ~ H202 ~ HCA-1. Based on the box-Behnken Design （BBD） experiment design principle, the effects of pH, stirring rate and stirring time on algae removal using PAFS＋ PDMDAAC were investigated. The results show that the three factors play significant effect on the removal of synedra acus, and the influence degree is pH^stirring rate,stirring time, while the interactive influence of the three factors is not significant. Moreover, the optimum condition of enhanced coagulation is obtained, in which pH is of 7.5, stirring rate is 75r/rain and stirring time is 15 rain, and the alga removal effect is 98.75 %.