臭氧-接种生物滤池组合工艺去除饮用水中典型致嗅物质

• 作 者: 袁蓉芳 周北海 施春红 顾军农 李玉仙
• 机 构: 北京科技大学,金属矿山高效开采与安全教育部重点实验室,北京科技大学土木与环境工程学院环境工程系,北京市自来水集团水质监测中心,
• 出 处: 环境科学研究
• 发表日期: 2013年07期
• 关键词: 生物滤池 臭氧化 饮用水处理 EBCT 组合工艺 臭氧投加量 土臭素 嗅味 处理效果 试验用水

通过在生物滤池表面接种MIB(2-甲基异茨醇)及geosmin(土臭素)降解菌,增强生物滤池的作用,并探讨臭氧-生物滤池组合工艺对MIB和geosmin的处理效果.结果表明:单独接种生物滤池可使ρ(MIB)和ρ(geosmin)从初始的500 ngL分别降至125和112 ngL,MIB和geosmin的去除效果先随EBCT(空床停留时间)的延长而显著增加,但当EBCT大于20 min后无明显变化;随着滤料深度的增加,滤池生物量逐渐降低,对污染物的去除率增加缓慢.在接种生物滤池前增加臭氧单元,当EBCT为20min、臭氧投加量为2 mgL时,臭氧-接种生物滤池组合工艺可去除84%的MIB和94%的geosmin,其中接种生物滤池单元中生物量随滤池深度的增加呈先增后减的趋势,滤料深度为100～200 mm时,单位高度滤料的去除率最高.采用臭氧-接种生物滤池组合工艺可有效去除水中的MIB和geosmin.

The effect of biofilter was enhanced by inoculating MIB (2-methylisobutyl alcohol) and geosmin (geosmin) -degrading bacteria on the surface of biofilter, and the treatment effect of MIB and geosmin by ozone-biofilter combination process was discussed. The results showed that MIB and geosmin could be reduced from initial 500 ngL to 125 and 112 ngL, respectively. The removal efficiencies of MIB and geosmin were first determined with EBCT (empty bed residence time ), But not significantly changed when the EBCT was greater than 20 min. With the increase of filter depth, the biomass of the filter gradually decreased and the removal rate of pollutants increased slowly. Before the inoculation of biofilter, ozone was increased Unit, when the EBCT is 20min and the dosage of ozone is 2mgL, the combined process of ozone-inoculation biofilter can remove 84% MIB and 94% geosmin, The increase of depth firstly increased and then decreased, and the highest removal rate of filter material per unit depth was obtained when the filter depth was 100 ~ 200 mm. The combination of ozone and inoculation biofilter could effectively remove MIB and geosmin in water.