利用PHREEQC模拟CO2对盐湖卤水中U的影响

Effect of the Uranium in the Brine During the CO2 Leakage: A Theoritical Simulation from PHREEQC

中文关键词:  CO₂地质封存  U  影响  模拟  尕斯库勒盐湖

英文关键词::Carbon dioxide geological storage  Uranium  Influence  Simulation  Gas Hure salt lake

中文摘要:

      选择U含量高的尕斯库勒盐湖卤水样为初始条件,利用PHREEQC软件模拟CO₂侵入卤水后对卤水中U的影响。结果表明,CO₂侵入卤水后,卤水中U的形态发生明显变化,新增了碳酸盐型的络合物,占总U(6)的12%；U的价态在CO₂侵入卤水前后无明显变化,以U(+6价)为主,占总U含量的99%以上；卤水的pH值减小,导致卤水中U可能发生沉淀作用而浓度减小,CO₂侵入前后分别为7.24E-07 mol·L-1和5.03E-07mol·L-1。研究对深入评估盐水层CO₂地质封存的环境风险提供理论依据。

英文摘要:

      :This paper choose Gas Hure salt lake brine samples for experimental initial conditions which have high concentration of uranium.PHREEQC software was used to simulate the influences uranium in the brine after CO₂ leakage from deep saline aquifer.It is indicated that after the CO₂ leakage into the shallow brine aquifer,chemical species of uranium were changed,especially the carbonate complex was increased which increased about 12%,but the valence of uranium is main U(+6) which is more than 99% have no changed.The concentration of uranium was decreased because of the value of the pH decreased.After the CO₂intrusion,the concentration of the uranium in the brine was reduced due to the precipitation of uranium and the concentration of U(6) is changed from 7.24 E-07 mol·L-1 to 5.03E-07 mol·L-1.This study provides the basis theory both on environment risk of CO₂ geological storage in the deep saline aquifer.