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Study On The Dispose Of Magnetic Anion-exchange Resin Regeneration Effluent

Posted on:2015-12-16Degree:MasterType:Thesis
Country:ChinaCandidate:Z X XuFull Text:PDF
GTID:2271330482484818Subject:Environmental engineering
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In recent years, the use of anion-exchange resin to purify water is on the rise, anion-exchange resin is becoming a promising technique in water treatment. However, the technology will produce little resin regeneration effluent(RRE) in the purifying process. The dispose of resin regeneration effluent is hard and expensive, and it has become a limit to the popularization of the technology. The study indicates that the contaminants in the resin regeneration effluent will entangle and agglomerate because of the high concentration. The contaminants sitck together and become bigger contaminants. They distribute mainly in about 100nm and become colloids.When the concentration of resin regeneration effluent is low (CODcr<4000 mg/L), nano-filtration will be suitable for the dispose. The volume of resin regeneration effluent will to 40% and the concentration will increase about 100% by NF. The permeate is about 60%. CODcr of the permeate ranks from 120 to 140 mg/L and NaC1 of the permeate is almost equal to the resin regeneration effluent. So the permeate is suitable to recycle to produce the regenerant. By NF and recycle of the RRE, the emission volume of RRE reduces and the utilization efficiency increases. The research indicates, pretreatment of RRE is necessary before NF and precision filter can meet the requirement. The operation condition has a greate effect on the result of NF. The higher temperature, the lagrer membrane flux. The higher pressure, the lagrer membrane flux. The higher concentration, the smaller membrane flux. Two months pilot scale test shows NF of RRE performs stably and the reuse of NaCl from one ton RRE values 15.3 yuan.When the concentration of resin regeneration effluent is high (CODcr>4000 mg/L), coagulation will be suitable for the dispose. By coagulation, the contaminants lfocculate and sink to become sludge. The coagulation sludge can be disposed with secondary sedimentation sludge together. The supernatant is clear and abundant of NaCl. The regenerant made from supernatant performs quite well. Through 4 recycle of coagulation-reuse process, the volume of RRE can be reduced 65%. The research indicates, PFC is a appropriate coagulant and the suitable dosage is 5.0 g/L and CODcr removal rate is 58% at this point. The appropriate pH ranks from 6.0 to 10.0. The addition of coagulant aids(PAM) can accelerate the settlement velocity and the suitable dosage of PAM is 6.0-8.0 mg/L.As the volume of RRE is about 0.2% of the feedwater after reduction and recycle, advanced oxidation following with biochemical treatment can offer a proper way for final disposal. After Fenton oxidation of RRE from coagulation, the construction of contaminants will be broke down and biodegradability of RRE increases. Mixed with feedwater, RRE from Fenton oxidation has little effect on the biochemical system. The research indicates, the RRE from coagulation needs no adjustment because its pH ranks from2.5 to 3.5. The more H2O2, the better oxidation performance. The appropriate dosage of H2O2 is 80-160 mmol/L. The percentage of RRE from Fenton added to feedwater less to 2% can be adopted.
Keywords/Search Tags:Magnetic anion-exchanged resin, Resin regeneration effluent, Recycle, Nano-filtration(N-F), Coagulation, Fenton
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