Method and system for recycling and treating dyeing wastewater

A method for recycling and treating dyeing wastewater, comprising the steps of:

• step (A):
• drawing dyeing wastewater into a pre-treatment tank;
• step (B):
• introducing an adsorbent into the pre-treatment tank, such that the adsorbent mixes quickly with the dyeing wastewater to assist in decolorization and filtration of the dyeing wastewater, wherein the pre-treatment tank has therein a first filtration device, the first filtration device comprising at least a hydrophilic porous membrane;
• step (C):
• passing the wastewater having undergone the assisted decolorization through the first filtration device for filtration treatment, so as to reduce chromaticity and suspended solid content of the wastewater;
• step (D):
• delivering a liquid resulting from the filtration treatment of the first filtration device to an RO filtration unit, followed by performing an RO membrane-based filtration process on the liquid and delivering clean water having permeated through an RO membrane of the RO filtration unit to a recycling tank for reuse;
• step (E):
• delivering concentrated wastewater discharged from the RO filtration unit to a second filtration device, the second filtration device comprising at least a hydrophobic porous membrane;
• step (F):
• performing a micro-bubbling and mixing process on the concentrated wastewater in the second filtration device, such that the concentrated wastewater and a gas mix evenly to form a creamy-white nebulized working liquid;
• and
• step (G):
• applying a suction-oriented negative pressure to a water yielding side of each said hydrophobic membrane, such that a steam in the working liquid, which is of high gas content, can readily pass through the at least a hydrophobic membrane, thereby removing residual chromaticity and suspended particles from the working liquid and producing an effluent that meets effluent standards.