摘要
针对高铁、高锰地下水中含有氨氮的问题,进行了生物除铁除锰过程中溶解氧需求及消耗规律的研究。结果表明:弱跌水曝气难以适应含氮地下水的净化对溶解氧的需求,在原水氨氮为1.2 mg/L、铁为15 mg/L、锰为1.5 mg/L左右的条件下,控制溶解氧>7.5 mg/L时,生物滤层才能培养成熟,出水锰离子浓度才能达标;过滤过程中溶解氧主要消耗在上部的45 cm滤层之内,用于铁的去除以及氨氮的硝化,下部除锰生物滤层能否得到充足的溶解氧是决定除锰成败的关键。
The demand and consumption of dissolved oxygen in the biological filtration for the re- moval of high concentration Fe and Mn from the groundwater containing ammonia nitrogen were studied. The results show that weak cascade aeration cannot provide adequate dissolved oxygen for the purification of the groundwater containing ammonia nitrogen. The dissolved oxygen should be maintained above 7.5 mg/L to culture the biofilter layer for manganese removal when ammonia nitrogen, Fe and Mn in the raw groundwater are 1.2 mg/L, 15 mg/L and 1.5 mg/L respectively. The dissolved oxygen is mostly con- sumed at the upper 45 cm of the filter for Fe removal and ammonia nitrogen nitrification. The residual dissolved oxygen concentration in the lower of the biofiher determines the result of the biological removal of manganese.
出处
《中国给水排水》
CAS
CSCD
北大核心
2009年第21期37-40,共4页
China Water & Wastewater
基金
国家自然科学基金资助项目(50578001)
关键词
地下水
生物除锰
溶解氧
氨氮
groundwater
biological manganese removal
dissolved oxygen
ammonia nitrogen
