초록 ▼

A method and system for recycling and treating dyeing wastewater are provided. To begin with, the dyeing wastewater is added with an adsorbent for assisted decolorization and filtration. Then, the wastewater is filtered with a first filtration device having hydrophilic membranes. The liquid having p

A method and system for recycling and treating dyeing wastewater are provided. To begin with, the dyeing wastewater is added with an adsorbent for assisted decolorization and filtration. Then, the wastewater is filtered with a first filtration device having hydrophilic membranes. The liquid having passed through the hydrophilic membranes undergoes an RO membrane-base filtration process to produce recycled water and concentrated wastewater. The concentrated wastewater is delivered into a second filtration device having hydrophobic membranes, before a micro-bubbling process is performed on the concentrated wastewater in the second filtration device to turn the concentrated wastewater into a creamy-white nebulized working liquid of high gas content. The steam in the working liquid can readily pass through the hydrophobic membranes to produce an effluent that meets effluent standards.

대표청구항 ▼

1. 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 decolorizatio

1. 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; andstep (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. 2. The method of claim 1, wherein, in step (B), the adsorbent introduced into the pre-treatment tank is one of diatomite, activated carbon, and zeolite powder. 3. The method of claim 1, further comprising, before step (E), the step of adding a decolorant to the concentrated wastewater having undergone the RO membrane-based filtration process. 4. The method of claim 1, further comprising, after step (G), the step of performing a dehydration process on high-concentration sludge having produced the effluent. 5. The method of claim 1, wherein, in step (F), the gas pumped into the concentrated wastewater for performing the micro-bubbling and mixing process is heated at a high temperature beforehand, such that the working liquid has a specific temperature. 6. The method of claim 5, wherein the temperature at which the working liquid is heated ranges between 30° C. and 60° C. 7. The method of claim 5, further comprising, in step (G), the step of performing a condensation process on steam molecules having passed through the at least a hydrophobic membrane, so as for the steam to condense into the effluent. 8. A system for recycling and treating dyeing wastewater, comprising: a pre-treatment tank for containing a predetermined volume of dyeing wastewater;a first filtration device disposed in the pre-treatment tank, the first filtration device comprising a horizontally positioned central pipe and a plurality of hydrophilic porous membranes mounted around the central pipe in a watertight manner, the hydrophilic membranes being in communication with the central pipe, such that a liquid having permeated through the hydrophilic membranes can flow into the central pipe;an RO filtration unit connected to an effluent end of the central pipe of the first filtration device;a recycling tank disposed beside the RO filtration unit and configured to collect and recycle for reuse a clean liquid having passed through the RO filtration unit;a second filtration device connected to a concentrated wastewater discharging pipeline of the RO filtration unit, the second filtration device comprising a casing for receiving concentrated wastewater, a water yielding pipe centrally and vertically disposed in the casing, and a plurality of hydrophobic porous membranes which are equally spaced from each other and horizontally arranged;a micro-bubbling device disposed beside the second filtration device, the micro-bubbling device comprising a gas supply corresponding in position to the casing so as to pump a pressurized gas into the concentrated wastewater in the casing and thereby turn the concentrated wastewater into a creamy-white nebulized working liquid; anda recycling tank connected to an effluent outlet of the water yielding pipe of the second filtration device. 9. The system of claim 8, further comprising a pre-heating device from which the working liquid acquires a specific temperature. 10. The system of claim 8, further comprising a negative pressure element configured to communicate with the water yielding pipe of the second filtration device and generate vacuum suction toward a water yielding side of each said hydrophobic membrane.