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Study on A/O-MBR Treating PTA Polyester Chemical Fiber Wastewater

Author: ZhaoChuanQi
Tutor: LiuLiFen
School: Dalian University of Technology
Course: Membrane Science and Technology
Keywords: A / O- MBR Simulation of chemical fiber wastewater Anti-pollution Composite film
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 234
Quote: 2
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Abstract


Membrane bioreactor technology (MBR process ) is a modern membrane separation technology and biotechnology organic combination of a new type of biological wastewater treatment technology, is present in high concentration organic wastewater treatment , water reuse treatment in areas such as the most promising biological wastewater processing techniques . But these defects in the low flux of the membrane , the high cost and membrane fouling is a bottleneck restricting the MBR engineering applications . Subject to the the Liaohe water special Liaoyang Chemical Fiber demonstration projects relying on the background , the experimental study of the A / O - MBR Process Simulation polyester chemical fiber wastewater , the study includes three parts : ( 1 ) the use of sol - gel method TiO2/PVA / polyester fabric composite membrane , and the commercialization of PVDF membrane contrast , the study found similar cloth composite membrane with PVDF membrane for removal of pollutants , water quality and stability , but the cloth composite membrane water flux increased by 50-90 % than the PVDF membrane ; cloth composite membrane at 3 months of the experiment , only a cleaning , the cleaning cycle is 4 times that of the PVDF . The cake layer formed on the surface of the composite membrane did not completely cover the membrane surface , while exposing a portion of the film surface , to ensure stable cloth composite membrane permeability . The EPS analysis found that in the low-flux phase , the protein concentration of the cloth composite film and the surface of the PVDF membrane is not much difference . However, in high-throughput stage , for reasons filamentous bulking , EPS , especially LB - EPS very significant increase . The polysaccharide concentration in the surface of the composite membrane is 128.56 mg ยท g-1 VSS, the polysaccharide concentration is far below the surface of the membrane of PVDF ( the 522 mg/g-1 VSS ) . ( 2 ) A / O - MBR system nitrification and denitrification effect significantly , the water is kept below 10 mg / L total nitrogen removal rate reached 80% ; reflux position to adjust the A pool , the system can be divided into anaerobic - anoxic zone - aerobic MBR district , after nearly 40 days of acclimation , the effluent nitrate nitrogen concentration down to 1.012 mg / L , the removal rate of close to 90 % TP removal rate from 10% to 40% off the A / O - MBR system nitrogen and phosphorus removal has been strengthened . (3) to the MBR pool dosing tri-iron tetroxide / diatomite composite particles , improve the characteristics of the sludge mixture to control membrane fouling was found that the particle concentration dosing to 0.1 / L , the dosage the MBR pool film surface EPS concentration as the reference more than 66% of the pool of MBR , sludge floc size is the reference MBR 1.75 times the final membrane flux reference pool MBR membrane flux 2.2 times .

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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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