Migration process simulation of ammonia nitrogen in contaminated site
(2.Institute of Karst Geology, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory, Ministry of Land and Resources and Guangxi Zhuang Autonomous Region, Guilin, China 541004)
【Abstract】In order to identify and predict the impact on soil and groundwater quantitatively due to ammonia nitrogen wastewater discharge, the soil water migration and solute transport model was built by using HYDRUS-1D software to simulate the process of migration and attenuation of ammonia nitrogen in the unsaturated-saturated zone of wastewater discharge area in this paper. The results showed that the adsorption-desorption phenomenon existed in the process of ammonia nitrogen wastewater vertical infiltration. Besides, the concentration of ammonia nitrogen showed a gradual wave-like decline vertically with attenuation of ammonia nitrogen. The wastewater discharge had a significant impact on the soil and groundwater of the site. The concentration of ammonia nitrogen in the groundwater table was raised to 867 mg/L, which was 8 178 times higher than the local groundwater background value (0.106 mg/L) and 4 334 times than III grade groundwater quality standard (GB/T 14848–93) (0.2 mg/L). The groundwater function was damaged. However, due to the timely cut off the pollution source and the termination of the discharge behavior, concentration of ammonia in the soil was close to 0 after 330 days suspension period and groundwater ammonia concentration was less than 2 mg/L.
【Keywords】 ammonia nitrogen; contaminated sites; migration and attenuation ; parameter inversion; HYDRUS-1D; unsaturated-saturated zone;
(Translated by CHEN ZZ)
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