The invention relates to a method for polluted
groundwater remediation by using in-situ construction of a nanometer
ferrous sulfide reaction zone. The method is characterized in that one or more of
injection well pairs are formed in the vicinity of a
pollution source in the flowing direction of underground water, one or more observation wells are arranged at the downstream of the injection wells,a
sodium sulfide solution, and a
mixed solution of
ferrous sulfate and
sodium hydrosulfite are correspondingly injected into the
injection well pairs in an intermittent manner, and after injection, pouring is stopped when it is monitored that the content of
ferrous iron changes into the expected content through the observation wells. The two kinds of injectant solutions have certain mobility in the underground, a
redox reaction can be generated underground, and the
iron ore environment with nanometer ferrous
sulfide as a main product is formed. The nanometer ferrous sulfide is spontaneously formed underground, has good mobility, and cannot cause medium blockage to influence the
permeability coefficient,
sodium hydrosulfite can be used for effectively ensuring the underground anaerobic reduction condition so that a bivalent iron
reaction zone can stably exist, the
reaction zone can be used for rapidly and efficiently removing pollutants, secondary
pollution is avoided, the cost is low,operation and maintenance are convenient, and therefore, the method is suitable for remediation of various types of polluted sites.