Method for treating highly concentrated resin-desorption liquid generated from wastewater deep purification

摘要

A method for treating highly concentrated resin-desorption liquid generated from wastewater deep purification, including channeling the highly concentrated desorption liquid generated from anion exchange resin treatment through a nanofiltration membrane, the liquid being separated into nanofiltration permeate that can be reused as the desorption agent and highly concentrated nanofiltration retentate; adding a coagulating agent to the highly concentrated nanofiltration retentate to generate coagulation-precipitation; subjecting the supernatant formed after the coagulation-precipitation process to Fenton oxidation or ozone oxidation; after the reaction, adding to the liquid an alkali solution for further coagulation-precipitation; then channeling the liquid so treated back to the biochemical system of biochemical effluent treatment for further biodegradation is provided. The recycled treatment of the highly concentrated desorption liquid consequently reduces the treatment cost and prevents secondary pollution by realizing innocuous treatment and reclamation of resin-desorption liquid as well as reduction of its total volume.

主权项

1. A method for treating a highly concentrated resin-desorption liquid generated from a wastewater deep purification biochemical system, comprising:
a) channeling the highly concentrated resin-desorption liquid generated from an anion exchange resin treatment of wastewater through a nanofiltration membrane and separating the highly concentrated resin-desorption liquid into a highly concentrated nanofiltration retentate and a nanofiltration permeate, wherein the nanofiltration permeate is reused as an desorption agent after oxidation; b) inducing a first coagulation-precipitation process by adding a coagulating agent to the highly concentrated nanofiltration retentate obtained in step a); c) subjecting a supernatant formed after the first coagulation-precipitation process to 1-5 hours of Fenton oxidation or ozone oxidation to obtain a solution; d) inducing a second coagulation-precipitation process by adding an alkali solution to the solution obtained in step c) for adjusting its pH value at 8.5-10.5; e) channeling a liquid obtained after the second coagulation-precipitation process of step d) to an activated sludge for further biodegradation; and f) channeling a liquid resulting from further biodegradation of the liquid obtained after the second coagulation-precipitation process of step d) with the activated sludge back to the wastewater deep purification biochemical system for further use in biodegradation, wherein the wastewater deep purification biochemical system uses an anion exchange resin.