再生水干湿交替回灌过程氮素动态变化特征研究  

Study on the dynamic change of nitrogen in the process of alternate irrigation process

作　　者：赵彩凤 杨建 ZHAO Cai - feng YANG Jian(Xi＇ an Research Institute, China Coal Technology and Engineering Group Corp, Xi＇ an 710054, China)

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710054

出　　处：《地下水》2017年第5期15-17,42,共4页Ground water

基　　金：国家自然科学基金(41302214);国家重点研发计划(2016YFC0501104);中煤科工集团西安研究院有限公司创新基金面上项目(2015XAYMS18)

摘　　要：再生水地下回灌过程中,研究了前处理和含水层中氮污染物在干湿交替回灌过程中的变化特征。结果表明:回灌期间,在臭氧氧化作用下会发生硝化反应,使NH4-N平均浓度降低0.196 mg/L,NO_3-N平均浓度上升为2.26 mg/L。再生水进入含水层后,水中游离氧仍然较高(6.89 mg/L),注入井附近会继续发生硝化反应,使5#井中NH4-N下降至<0.07 mg/L;NO_3-N浓度在3#井到5#井之间符合线性方程y=-0.172 8 x+31.245;NO_2-N在3#井、4#井和5#井中平均浓度分别为2.02 mg/L、2.023 mg/L和2.427 mg/L。非回灌期地下水中反硝化反应使NO_3-N降低了12.241 mg/L,NO_2-N均上升了0.918 mg/L。另外,TN的变化规律与NO_3-N类似,非回灌期5#井中TN的去除率达56.6%。During the underground recharge of reclaimed water, the change characteristics of nitrogen pollutants in the pretreatment and aquifer during the alternate dry and wet recharge process were studied. The results show that nitrification occurs under ozonation, and the average concentration of NH4 -N is decreased by 0. 196 mg/L, and the average concentration of NO3 - N is increased by 2.26 mg/L during the recharge period. After the recycled water enters the aquifer, the free oxygen in the water is still higher （6.89 nag/L） , and the nitrification reaction will continue to occur near the injection well, reducing the NH4 - N to 〈 0.07 mg/L in the 5# well. The linear equation y = - 0. 172 8 x ＋ 31. 245 is in line with the concentration of NO3 - N in 3 # and 5 # well; the average concentration of NO2 - N in 3# well, 4# well and 5# well is 2.02 mg/L, 2. 023 nag/L and 2. 427 mg/L, respectively. Denitrification in non recharge groundwater reduced NO3 - N by 12. 241 nag/L, and NO2 - N increased by 0. 918 mg/L. In addition, the change rule of TN is similar to that of NO3 - N, and the removal rate of TN is 56, 6% in non recharging 5# well.

关 键 词：再生水 地下回灌 “三氮” 迁移转化 

分 类 号：P641.25[天文地球—地质矿产勘探]