城市景观水体中腐殖酸的臭氧氧化去除

以南京师范大学德风园池底泥中提取的腐殖酸(HA)为研究对象,采用臭氧氧化技术对其进行去除,对初始pH值、混合气体流量、腐殖酸(HA)初始浓度以及水中常见离子等因素对去除效果的影响进行了研究。实验结果表明:腐殖酸(HA)的去除率随初始pH值的升高而提高,随混合气体流量减少而提高;当腐殖酸(HA)初始浓度为5 mg/L时,反应过程中溶液的UV254升高,紫外扫描结果发现,溶液在200~220 nm内出现杂乱的吸收峰,表明有新物质生成;水中常见的无机阴离子(CO32-、HCO3-)和二价金属离子(Ca2+、Cu2+)的存在会降低臭氧对腐殖酸(HA)的去除率。

Removal of Humic Acid in Urban Landscape Water by Ozone

Humic acid（HA）,extracted from sediments of Defeng Pool in Nanjing Normal University,was removed by an ozone treatment technique.The effect of initial pH value,mixed gas-flow rate,initial concentration of humic acid（HA） and common ions in water on the removal rate of humic acid was investigated.The experimental results showed that the removal rate of humic acid improved with increasing pH and decreasing mixed gas-flow rate;when the initial concentration of humic acid was 5 mg/L,the value of UV254was increased during the reaction,the ultraviolet spectra analysis showed that the reaction solution had unorganized absorption peaks in the wavelength of 200-220 nm and new substance was proved to be generated;the existence of the common inorganic anions（CO2-3,HCO-3） and divalent metallic ions（Ca2＋,Cu2＋） in water decreased the removal rate of humic acids.