Treatment method for etching waste water containing fluorine and ammonium

The invention discloses a treatment method for etching waste water containing fluorine and ammonium. The method comprises the following steps that (1) ammonium bicarbonate is added into the waste water, after a reaction is finished, solid-liquid separation is conducted, and tail gas is absorbed by water; (2) after the solid-liquid separation, a filtrate and the water absorbing the tail gas in thestep (1) are concentrated through a reverse osmosis system, and fresh water and concentrated water are prepared; (3) after the solid-liquid separation, a solid obtained in the step (1) is washed withthe fresh water in the step (2) and dried, white carbon black is obtained, and washing water is circulated to reverse osmosis treatment; (4) the white carbon black in the step (3) is added into the concentrated water in the step (2), then boric acid is added, the mixture is stirred and mixed uniformly, and a temperature preservation reaction, filtering and drying are conducted; (5) after drying, asolid obtained in the step