METHOD FOR TREATING WASTEWATER CONTAINING HEAVY METALS AND HIGHLY CONCENTRATED TOTAL NITROGEN GENERATED DURING THE PRODUCTION OF A POSITIVE ELECTRODE ACTIVE MATERIAL PRECURSOR FOR A SECONDARY BATTERY

摘要

The present invention relates to a method for treating wastewater containing heavy metals and highly concentrated total nitrogen (T-N) generated during the production of a positive electrode active material precursor for a secondary battery. More particularly, the present invention relates to a method for treating wastewater containing heavy metals and highly concentrated total nitrogen (T-N) generated during the production of a positive electrode active material precursor for a secondary battery, comprising: a first step of flocculating the heavy metals in the wastewater in a flocculator; a second step of filtering, using a filtering device, the heavy metals flocculated in the first step; a third step of enabling the highly concentrated total nitrogen (T-N) in the wastewater filtered in the second step to react with a pH modifier to obtain inorganic salts; and a fourth step of separating and concentrating the trace amount of heavy metals which remain in the wastewater after the third step, as well as the inorganic salt components, using an evaporative concentrating device.