摘要：

采用高铁酸盐对湖泊、水库水进行预氧化、絮凝除藻, 对其除藻的影响因素及其与预氯化除藻效果进行了对比。结果表明, 采用高铁酸盐预氧化, 投加0.14mg/L就能明显提高聚合铝对含藻类水混凝的除藻率。1.4mg/L高铁酸盐预氧化与20mg/L聚合铝联用的除藻率是单纯投加40mg/L聚合铝的3倍;水样pH对含藻类水处理的影响, 除藻率pH5.0＞ pH7.5＞pH10;延长高铁酸盐预氧化时间, 除藻率稍有增加, 但超过10min, 对除藻率影响不大;腐殖酸的存在会明显阻碍聚合铝的除藻效果, 而高铁酸盐可消除腐殖酸对聚合铝混凝的阻碍作用;高铁酸盐预氧化、絮凝的除藻效果比预氯化明显, 是一种可取代预氯化除藻的新药剂。

关键词: 高铁酸盐预氧化, 预氯化, 除藻

Abstract:

In order to observe the effect of the removing of algae, the effecting factors of algae removal in lakes and reservoirs by preoxidation with ferrate are studied and compared with prechlorination. When removing algae with ferrate, the ferrate concentration being 0.14 mg/L can improve the PAC efficiency of the removing of algae evidently. The efficiency of removing algae adding 1.4 mg/L ferrate with 20 mg/L PAC is three times than that of adding PAC 40 mg/L only. When treated with water containing algae, the efficiency of removing algae is pH 5.0, higher than pH 7.5 and higher than pH 10.0. Prolonging the time of preoxidation with ferrate, the efficiency of removing algae is improved a little, but if longer than 10 min, the efficiency of the removing of algae is almost not improved. The humic acid can hamper the effect of removing algae with PAC, but ferrate can eliminate the effect of humic acid. The effect of algae removal with ferrate is much better than that with prechlorination, so ferrate can be used to substitute for chlorine in the removing of algae.

Key words: pre-oxidation with ferrate, pre-chlorination, algae removal

中图分类号: 

• TQ138.1+1