The invention relates to a
system for preparing
potassium sulfate from high-salt-content industrial
wastewater and belongs to the field of
water treatment. The high-salt-content industrial
wastewater is pretreated through a regulating
pool, a pipeline mixer, a high-density precipitate
pool, a V-type filter
pool,
ion exchange resin and an
ultrafiltration membrane
system and then concentrated through a first section
reverse osmosis membrane
system and a second section
reverse osmosis membrane system and then enters a
nanofiltration membrane system for salt separation,
nanofiltration produced water and thick water enter a plate-
pipe type high-pressure
flat sheet membrane system II and a plate-
pipe type high-pressure
flat sheet membrane system I respectively to be concentrated again, the concentrated thick water enters a freezing
crystallization system for
crystallization, crystals enter a
potassium sulfate preparing system to be converted, freezing
mother liquor and the concentrated
nanofiltration produced water enter an advanced oxidizing system for oxidation and then enter an evaporative
crystallization system for crystallization, and produced
sodium sulfate crystal salt enters a
potassium sulfate preparing system for conversion. The system has the advantages that the scale of the nanofiltration system is reduced, and
investment cost is reduced; salt separation is thorough, and operation cost is low; the purity of the crystallization salt is high;
mirabilite and
sodium sulfateare converted into
potassium sulfate, and the economic value is improved.