Environment-friendly discharging method for ammonia nitrogen wastewater produced in regeneration and cyclic utilization process of etching solution

The invention discloses an environment-friendly discharging method for ammonia nitrogen wastewater produced in the regeneration and cyclic utilization process of an etching solution. The method is characterized by comprising the following steps: S1, collection of the ammonia-nitrogen wastewater, and impurity removal; step S2, wastewater treatment; step S3, settling and filtering; and step S4, nanofiltration membrane treatment. The environment-friendly discharging method for the ammonia nitrogen wastewater produced in the regeneration and cyclic utilization process of the etching solution can be used for safely, efficiently and quickly treating the ammonia-nitrogen wastewater produced in the regeneration and cyclic utilization process of the etching solution, has small influence on the environment, is short in treatment period, low in equipment investment and relatively low in operation cost, does not cause air pollution, and is suitable for large-scale industrial application. 本发明公开了一种蚀刻液再生循环利用过程中氨氮废水的环保排放方法，其