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Preparation of Poly (Aryl Ether) Containing Heterocycle Moeity Composite Membrane and Its Application in the Water Treatment

Author: SunYang
Tutor: ZuoXiGao
School: Dalian University of Technology
Course: Polymer materials
Keywords: phthalazinone Pretreatment Nanofiltration membrane Water treatment Membranes’ cleaning
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 67
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Abstract


Contradiction between the water scarcity and the industrial water consumption overabundance is more and more severe.The membrane separation method of treating industrial wastewater is more and more application.Among them,ultrafiltration and nanofiltration membranes with dense separation layers play an important role in wastewater treatment.Development of thermal stable membranes is meaningful since it can further broaden membrane application fields,improve separation efficiency and spare energy.A Flocculation-Ultrafiltration-Nanofiltration process is reviewed to treat organic wastewater with high concentration of acid and salt.It gets a ideal result and shows that the grouping craft has abroad prospects and value in application.A UF membrane of poly（phthalazinone ether sulfone）（PPES） integrating poly-Aluminum chloride（PAC） as flocculants was chosen to pretreat organic waste water with high concentration of acid and salt instead of the traditional pretreatment.The dosage of flocculants were studied.The experiments on the removal of organic sub -stance and SS using ultrafiltration process were carried out.The results indicated that the best dosage of PAC was 100mg·L-1with 30%of the removal efficiency of COD and up to 90%of the removal efficiency of SS.The removal efficiency of SS can approach to 100%in ultrafiltration process. A part of organic substance would be removed in ultrafiltration process.The casting formula is PPES15.0wt%、NMP 69.0 wt%、HAc16.0wt%,in which flux of treating wastewater gets to 15 L·m-2·h-1,rejection rate gets to 38%.Based on the pretreatment,the nanofiltration experiments for the treatment of the organic wastewater were carried out.Nanofiltration membrane were prepared by interfacial polymerizing 1,3,5-benzenetricarbonyl chloride（TMC）with piperazine（PIP） on the surfaces of PPESK support membranes.The best concentration of piperazine is about 1.20wt%, concentration of TMC is about 0.12 wt%.The operating conditions（such as pressure, temperature and time） were studied in nanofiltration process.The results indicated that the optimal operation pressure is 1.20 MPa.The permeation flux at 80℃is as 3 times as at 20℃, and the rejection rate keeps constant.The permeation flux declined smoothly in original 15h. PPESK membrane shows well anti- polluted.The product water quality suffices the request of the follow-up aerobic biological reactor. According to the characteristic of the operation and the membrane fouling,using different cleaning methods（cold water,hot water,acid lye and alkali lye to back washing）revive used membrane modules.The back-washing time was studied,and also comparing the effect of the different cleaning.The best back-washing method was confirmed. The results indicated that the effect of chemical cleaning is better than cold/hot water back washing.The best washing method is using Na2EDTA cleaning 45minutes for ultrafiltration membrane and using the 1.0wt%HC1 and 1.0wt%NaOH alternating cleaning 30minutes for nanofiltration membrane.Comparing with simple washing method,alternating cleaning method gets the better effect.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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