中文摘要：

以明化镇组热储层细砂为含水层孔隙介质，模拟地热水温度环境开展室内土柱模拟试验，研究不同温度条件下地热水亚稍态氮的转化规律，该研究为降低地热水中N02-含量、地热水污染治理、修复及其可持续利用提供基础性科学依据.结果表明，细砂热储层中N02-—N向N03-—N, NH4＋—N方向转化明显，是稍化作用和反稍化作用的共同作用，转化强度受温度影响较大，且40℃时N03-积累的可能性比50℃时大.N03-—N含量随时间变化趋势为，40℃时先迅速增高后逐渐降低，50℃时呈逐渐增高趋势.NH4＋—N含量随时间变化趋势明显，40,50℃时均呈增高趋势，50℃较40℃增高快.TN含量随反应时间的增加呈降低趋势.两个温度下N02-—N转化过程的pH值稳定在7.74~8.30，呈弱碱性，与反稍化作用强度有关;对应的DO值变化范围为2.88~3.78 mg· L-1，均随反应时间而有减小的趋势.

英文摘要：

To study on the transformation of nitrite in a geothermal reservoir, the soil column experiments at different temperatures were carried out in the fine sand derived from a geothermal reservoir which was com- posed of Minghuazhen formation. The research can offer scientific evidence for reducing the content of NO2- , pollution management, repairing and providing sustainable utilization of the geothermal water. The results showed that the studied NO2--N in the simulated fine sand column was transfered to NO3---N and NH4＋--N at the same time and the temperature had an important effect on its conversion. The extent of accumulation of NO2 at 40 ℃ is more than that at 50 ℃. The content of NO3--N increased rapidly and then gradually re- duced at 40 ℃ while it increased gradually at 50 ℃. The content of NH4＋-N increased gradually at 40 ℃ and 50 ℃. On the contrary, the content of TN decreased gradually with time. The pH value fluctuated in the range of 7.74 - 8.30 which was related to denitrification. The DO （dissolved oxygen） value decreased with time and changed in the range of 2.88 - 3.78 mg. L-1