Patent ID: 8480905

Claim:
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.