The present disclosure provides a processing method for wastewater containing tetramethylammonium chloride including the following steps. A microbial composition is provided, wherein the microbial composition includes a microorganism of the genus Ochrobactrum sp., a microorganism of the genus Achromobacter sp. and a microorganism of the genus Mycobacterium sp. A mixing step is performed, wherein the microbial composition is added into a wastewater containing tetramethylammonium chloride and mixed evenly so as to obtain a mixture. A reaction step is performed, wherein the mixture is reacted for a reaction time so as to degrade a tetramethylammonium chloride of the wastewater containing tetramethylammonium chloride. Therefore, the processing method for wastewater containing tetramethylammonium chloride of the present disclosure can degrade the tetramethylammonium chloride of the wastewater containing tetramethylammonium chloride, so that the processing method for wastewater containing tetramethylammonium chloride of the present disclosure has application potential in the relevant market. |