氨氮在松散孔隙型热储层中的吸附影响因素研究  

Study on the influential factors of NH_4^+-N adsorption in the loose-pore geothermal reservoir matrix

作　　者：赵丽[1] 阿丽莉[1] 刘梦杰[1] 张艳欣[1] 王心义[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454100

出　　处：《安全与环境学报》2012年第4期95-98,共4页Journal of Safety and Environment

基　　金：国家自然科学基金项目(40972164)

摘　　要：以郑州市松散孔隙型热储层的细砂为研究对象,研究了岩样质量、pH值、温度、初始质量浓度等对氨氮吸附特性的影响。结果表明,研究区热储层的细砂对氨氮的吸附是一个放热的物理吸附过程,其中快速吸附占了很大比例并且能在短时间内达到吸附平衡,这与起主要吸附作用的黏粒含量较少有关。如果吸附剂已经能够提供足够的吸附位,那么土量增加反而会减少其吸附量。pH值越大,温度越低,岩样对氨氮的吸附能力越强;在一定范围内吸附量与氨氮溶液的初始质量浓度有关,初始质量浓度越高,吸附量越大。The present paper takes it as its target to study the influential factors of NH4^＋ - N adsorption by the loose-pore geothermal reservoir matrix in Zhengzhou, Henan. Our study of the NH4^＋ - N adsorption/disorption behaviors are mainly focused on the soil, river sediments, sepiolite, montmorillonite and the activated carbon compounds in some geothermal reservoirs. For our research purpose, we have done some batch studies to make clear the influential factors in the soil mass, pH value and temperature on the ammonia adsorption by the loose-pore geothermal reservoir in Zhengzhou. The above said experiments were conducted in a temperature-controlled shaker with the fixed agitation speed of 150 r/min for all the batch experiments, in which the.temperatures were kept in a variation from 20 ℃ to 60℃, whereas the concentrations of ammonium adopted in this paper were allowed to vary from 5 mg/L to 500 mg/L. At the same time, the pH was regulated to the desired value by using 0.1 moL/L HC1 or NaOH solutions. The results of our experiments indicate that all the above mentioned parameters tend to have significant effects on the adsorption of NH4^＋ ion by the soil from the loose-pore geothermal reservoir. Since the adsorption of NH4^＋ ion is by nature a physical adsorption process due to the heat-exchange, it can be done to reach its equilibrium state in a short period of time due to the low percentage of the clay particles. On the condition that, as long as the adsorptive capacity of ammonia keeps decreasing with the increase of soil mass, the adsorption matrix would be able to provide necessary ammonia to quite enough surface sites. However, if the adsorptive ability of ammonia increases with the increase of pH value, the temperature is likely to drop down but the initial mass concentration of ammonia tends to increase. In this case, the adsorption data tends to become nicely fit for the Langmuir and Freundlich adsorption isotherm, as is indicated by the regression coefficient for such systems.

关 键 词：地球化学 吸附 氨氮 PH值 热储层 细砂 

分 类 号：X131.2[环境科学与工程—环境科学]