Abstract:According to the theory of the advection-dispersion effect of groundwater, the coupled model of groundwater seepage and contaminant transport was established using GMS software. By numerical simulation method, the transport characteristics of the groundwater contaminant were analyzed. Under the two cases of sorption and dissolve or not, the contaminant laws were analyzed in the process of migration. The results showed that the groundwater and soil had natural ability of purifying contaminant, but it was not obvious. Zero-valence iron was choose as the PRB wall medium, the effects of decreasing nitrate concentration were simulated with GMS software by Fe0-PRB in rehabilitating groundwater contaminant. The pollution plume decreased significantly and pollution concentration reduced effectively. When the PRB thickness was 4meters, contaminant passed through the PRB wall after 550days. To the No.1, 2, 3observation well, the pollution concentration were 1.712, 0.011, 0.018mg/L respectively after PRB processed 10years. And there was a significant pollution plume tail under the PRB. When the thickness of PRB was added to 6meters, contaminant passed through the PRB wall after 850 days. The concentration of observation well was 0.52, 0.004, 0.005mg/L respectively after PRB processed 10 years, in the No.1, 2, 3. The pollution concentration have been reduced 9.6%, 63.6% and 72.2% respectively comparing with 4meters PRB. The pollution plume tail still existed but it was not significant. To the numerical simulation method, it was an important tool of evaluating the effect of PRB in rehabilitating groundwater pollution and defining the PRB parameters.
邓红卫, 贺威, 胡建华, 周科平. Fe0-PRB修复地下水硝酸盐污染数值模拟[J]. 中国环境科学, 2015, 35(8): 2375-2381.
DENG Hong-Wei, HE Wei, HU Jian-Hua, ZHOU Ke-Ping. Numerical simulation of Fe0-PRB in rehabilitating groundwater contaminated by nitrate. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(8): 2375-2381.