The invention discloses a treatment method of high-salt high-
ammonia-
nitrogen waste water. The treatment method comprises steps of membrane absorption,
nanofiltration,
forward osmosis, and cooling
crystallization. According to the treatment method, a
sulfuric acid solution is taken as an absorption liquid,
ammonia nitrogen in waste water is changed into
ammonium sulfate via membrane absorption; obtained
ammonium sulfate solution is concentrated further via
nanofiltration; the concentrated
ammonium sulfate solution is taken as a driving liquid of
forward osmosis, a high-salt waste water obtained after
ammonia nitrogen removing via membrane absorption is taken as a feed liquid of
forward osmosis, and forward
osmosis concentration is carried out; the
ammonium sulfate solution is diluted, and a part of the diluted
ammonium sulfate solution is recycled to a
nanofiltration unit for concentration of a second time; after a plurality of forward
osmosis concentration, concentrated water of a forward
osmosis unit is subjected to cooling
crystallization; and an obtained supernate is recycled for circulating concentration, and obtained
crystal is dried and is subjected to concentrated disposal. The treatment method is used for treatment of high-salt high-ammonia-nitrogen waste water, almost no concentrated water is discharged, problems of high-salt high-ammonia-nitrogen waste
water treatment are solved effectively,
water recovery rate is high, quality of obtained water is high, and
recovery of water resource of high-salt high-ammonia-nitrogen waste water is realized as far as possible.