二氧化氯杀灭小球藻

实验研究了二氧化氯投加量、小球藻的初始浓度、pH、有机物和氨氮含量对ClO2杀灭来自于水库水的小球藻的影响,考察了ClO2氧化与混凝工艺结合时去除小球藻的效果并对工艺条件进行优化。结果表明,ClO2在投加量1.1 mg/L下,接触10 min,小球藻的杀灭率为71.93%。小球藻的杀灭率随着ClO2投加量的增大和藻初始浓度的升高而提高,随水中有机物含量的增加而显著降低,氨氮含量对小球藻杀灭的效果影响很小。在酸性条件和碱性条件下,小球藻的杀灭率均随pH升高而急剧下降,而在中性至弱碱性区间内,藻的杀灭率随pH升高而缓慢下降。对于某以小球藻为优势藻的供水水库源水,ClO2氧化与混凝工艺结合,藻的去除率高达98.47%。除藻的最佳工艺条件为：二氧化氯投加量为0.5 mg/L,聚合氯化铝为5 mg/L,二氧化氯与混凝剂同时投加。

Killing Chlorella with chlorine dioxide

The experiments of the effect of the ClO2 dosage,initial algal concentration,pH,organic matter and ammonia nitrogen concentration on killing Chlorella in water from reservoir with chlorine dioxide were carried out.The Chlorella removal effect by combining chlorine dioxide oxidation with coagulation was investigated,and the process conditions were optimized.The results showed that the efficiency of killing Chlorella was 71.93% after 10 minutes when chlorine dioxide dosage was 1.1 mg/L.The efficiency of killing Chlorella rose with the increase of chlorine dioxide dosage and initial algal concentration,but decreased remarkably with the increase of organic matter concentration.Ammonia nitrogen had little effect on killing Chlorella.In acidity and basicity conditions,the efficiency of killing Chlorella sharp declined with the increase of pH,but descended slowly from neutral to weak base.For the raw water from reservoir which Chlorella was the advantage alga,the removal efficiency of algae was 98.47% when chlorine dioxide oxidation was combined with coagulation.The best process conditions were that the dosages of ClO2 and aluminium polychlorid were 0.5 mg/L and 5 mg/L,respectively,adding ClO2 and PAC simultaneously.