地下水环境中铁对三氮的迁移转化规律研究  

Study on the Influence of Iron Ions on Transfer and Transformation of Tri-N in Groundwater

作　　者：赵伟[1] 韩书宝[1] 

机构地区：[1]石家庄市环境监测中心,石家庄050022

出　　处：《价值工程》2017年第12期195-197,共3页Value Engineering

摘　　要：为研究铁离子对氮素迁移转化规律的影响,开展室内土柱模拟实验。结果表明:Fe^(2+)通入前,硝态氮和亚硝态氮穿透时间基本一致,趋于平衡,而NH_4^+因含水层介质的吸附作用,其穿透时间较长。FeSO_4溶液通入后,硝酸盐和亚硝酸盐出现明显的下降,Fe^(2+)的存在导致硝态氮的浓度降低而氨氮的浓度升高,Fe^(2+)还原硝酸盐间生成NH_4^+;随着Fe^(2+)持续通入后,生成的Fe^(3+)转化Fe(OH)_3沉淀物,吸附NH_4^+,导致氨氮的浓度降低。因此,铁离子的存在对地下水环境中三氮的转化具有极大的影响,故在地下水高浓度铁的地下水环境下,不可忽视铁离子的存在对三氮的影响。In order to study the effect of iron ions on nitrogen transport and transformation,the indoor soil column simulation experiment was carried out.The results showed that before Fe^2＋ was introduced,the permeation time of nitrate nitrogen and nitrite nitrogen was basically the same,and the permeation time of NH4＋was higher due to the adsorption of aquifer media.After the FeSO4 solution was introduced,the nitrate and nitrite were decreased obviously.The presence of Fe^2＋ resulted in the decrease of the concentration of nitrate nitrogen and the increase of ammonia nitrogen.NH4^＋was generated during Fe^2＋ reducing the nitrates.After continuous introduction of Fe^2＋ ,the Fe^3＋ converted to Fe（OH）3 precipitate,and adsorbed NH4＋,resulting in a decrease in ammonia concentration.Therefore,the presence of iron ions has a great influence on the transformation of tri-nitrogen in the groundwater environment.Therefore,the influence of iron ions on the tri-nitrogen concentration can not be neglected in the groundwater environment with high concentration of iron.

关 键 词：地下水 硝酸盐 氨氮 亚硝酸盐 土柱 

分 类 号：TU991.112[建筑科学—市政工程]