Method for removing BTEX out of underwater through novel sodium percarbonate oxidizing agent

The invention relates to a method for removing BTEX out of petroleum hydrocarbon polluted underwater through a novel sodium percarbonate oxidizing agent. The method refers to removing BTEX pollutants out of underwater by virtue of the oxidization effect of a novel environment-friendly oxidizing agent, namely sodium percarbonate (Na2CO3.1.5H2O2, SPC). In the treatment process, in the presence of sodium percarbonate, ferrous ions are added to activate the oxidizing agent and a chelate is added at the same time to enhance the activating effect, thereby accelerating the chemical oxidization process of BTEX. The method has the advantages that sodium percarbonate has the characteristics of good water solubility, strong oxidizing capability, high stability, long-lasting oxidizing effect and the like; the use of the ferrous chelate can ensure the stable existence of the dissolved-state ferrous ions stably in the system and can effectively activate sodium percarbonate, thereby improving the timeliness of the oxidization effect and the removal rate of BTEX; sodium carbonate which is a reduzate of sodium percarbonate is a basic material which can provide a basic environment so as to adjust the acid-base property of the reaction environment. By the method, the petroleum hydrocarbon polluted underwater can be efficiently treated in an environmentally friendly way without causing secondary environmental pollution.