六价铬离子对生物慢滤技术处理微污染原水的影响  

Effect of Hexavalent Chromium Ions on Biological Slow Filtration Technology for Treating Micro-polluted Raw Water

作　　者：张国珍[1,2] 赵凯 武福平 周添红[1,2] 杨光 ZHANG Guo‑zhen;ZHAO Kai;WU Fu‑ping;ZHOU Tian‑hong;YANG Guang(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]甘肃省黄河水环境重点实验室,甘肃兰州730070

出　　处：《中国给水排水》2023年第13期60-65,共6页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51768031);国家重点研发计划项目(2019YFD1100103);甘肃省非常规水资源化利用技术重点实验室资助项目(UWKL-1903)。

摘　　要：采用填充不同滤料(活性炭、沸石和石英砂)的生物慢滤柱处理微污染原水,考察六价铬离子(初始浓度为0.15 mg/L)的存在对污染物去除效果的影响。结果表明,六价铬离子对生物慢滤柱中的微生物具有毒害作用,导致3种生物慢滤柱对COD_(Mn)和氨氮的去除率以及沸石和石英砂滤柱对六价铬离子的去除率均呈先下降后上升的趋势;由于活性炭拥有巨大的比表面积,因此活性炭滤柱对六价铬离子的去除率始终能稳定在较高水平;不同生物慢滤柱对COD_(Mn)、氨氮和六价铬离子的去除率表现为:活性炭滤柱>沸石滤柱>石英砂滤柱,这是由于3种滤料的比表面积及其所含的可促进微生物生长的微量元素不同所致;在活性炭滤柱中,污染物浓度沿程下降,前20 cm内的污染物去除率变化最大且出水污染物浓度均可达到《生活饮用水卫生标准》(GB 5749—2006)。The biological slow filtration column filled with different filter media(activated carbon,zeolite and quartz sand)was used to treat micro‑polluted raw water,and the influence of hexvalent chromium ion with initial concentration of 0.15 mg/L on the pollutants removal efficiency was investigated.Hexavalent chromium ion was toxic to microorganisms in the biological slow filtration column,which led to the trend of first decreasing and then increasing in the removal rates of COD_(Mn) and ammonia nitrogen by the three kinds of biological slow filtration column and the removal rate of hexavalent chromium ion by zeolite and quartz sand filter columns.Due to the huge specific surface area of activated carbon,the removal rate of hexavalent chromium ion by the activated carbon filtration column always stabilized at a high level.The removal rates of COD_(Mn),ammonia nitrogen and hexvalent chromium ion by different biological slow filtration columns in descending order were as follows:activated carbon filter column,zeolite filter column and quartz sand filter column,which was due to the differences in specific surface area of the three filter materials and the trace elements contained that could promote microorganisms growth.In the activated carbon filtration column,the pollutants concentration decreased along the layer,the pollutants removal rate within the first 20 cm changed the most,and the pollutants concentration in effluent met the Standards for Drinking Water Quality(GB 5749-2006).

关 键 词：生物慢滤 微污染原水 六价铬离子 

分 类 号：TU991[建筑科学—市政工程]