二氧化氯预氧化除铁过程中亚氯酸根作用的实验研究  

Experimental Study on Effect of Chlorite on Chlorine Dioxide Pre-oxidation of Iron Removal

作　　者：许友芹[1] 李金成[1] 李芳芳[1] 韩在峰[1] 

机构地区：[1]青岛理工大学环境与市政工程学院,山东青岛266033

出　　处：《净水技术》2007年第2期28-31,共4页Water Purification Technology

摘　　要：将ClO_2-ClO_2^-作为整个控制体系,通过模拟试验,研究二氧化氯预氧化除铁过程中亚氯酸根浓度变化及其发挥氧化性能除铁的影响因素。结果表明:pH值是二氧化氯投加量和亚氯酸根发挥氧化效能的重要影响因素,pH值越低亚氯酸根的氧化效能越低,生成亚氯酸根越多。当pH值较高时,二氧化氯只需按照理论投加量(即[ClO_2]/[Fe^(2+)]= 0.242),亚氯酸根便能充分发挥其氧化效能,亚氯酸根不会形成累积。实验表明:铁的初始浓度为2～9mg/L,5.8≤pH≤6.6时,0.242≤[ClO_2]/[Fe^(2+)]≤0.387时,能有效地将水中的铁离子降到0.3mg/L以下。ClO2-ClO2^- was taken as a whole control system during chlorine dioxide pre-oxidation of iron removal. A bench-scale study was conducted to investigate the variety concentration of the chlorite and affecting factors of oxidation. The results showed that the pH value was an important affecting factor to the dosage of chlorine dioxide and chlorite＇s oxidation. The lower the pH value, the lower the chlorite＇s oxidation efficiency was, which produced more chorite. When the pH value of the raw water was higher, the dosage of chlorine dioxide just followed theoretical amount （[ClO2]/[ Fe^2＋]= 0.242） and chlorite could develop its oxidation completely, so there was no chlorite accumulation. Under the condition of [Fe^2＋]=2-9mg/L, 5.8≤pH ≤6.6, 0.242 ≤ [ClO2]/[ Fe^2＋] ≤ 0.387, chlorine dioxide could decrease the concentration of Fe^2＋ in initial water to 0.3mg/L.

关 键 词：二氧化氯 亚氯酸根 预氧化 除铁 

分 类 号：TU991.2[建筑科学—市政工程]