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Study on the Membrane Fouling of Liquidized Bed Membrane Bioreactor Controlled by Online Ultrasonic

Author: GongCunPeng
Tutor: LiMin
School: Beijing Forestry University
Course: Environmental Science
Keywords: Fluidized bed membrane bioreactor Online ultrasound Membrane fouling Nature of the sludge mixture
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 1
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Abstract


With the rapid development of the socio-economic, industrial and urban water demand is increasing rapidly, sewage has become one of the important water resources. Membrane bioreactor as a new sewage recycling technology that enables dynamic circulation of the water resources in the region, to protect the security and stability of the reclaimed water quality. Membrane bioreactor technology and fluidized bed process, a combination of fluidized bed membrane bioreactor can better play the advantages of both, to further improve the efficiency of the removal of pollutants, but the membrane fouling is still affecting the membrane bio one of the key issues of the reactor run stability and economic. In this paper, at home and abroad ultrasonic cleaning of membrane pollution research based on fluidized bed membrane bioreactor membrane fouling, online ultrasound control membrane fouling. Successfully build fluidized bed membrane bioreactor based on ultrasound experiments ultrasound can select the parameters, and to carry out the ordinary fluidized bed membrane bioreactor and ultrasound fluidized bed membrane bioreactor process of self sewage long-term experiments were used frequency in the low-frequency, power 200W, frequency in the low-frequency power of 300W and frequency of IF, a 300W ultrasonic conditions to study the effect of online ultrasound on membrane fouling control, effects of ultrasound convection fluidized bed membrane bioreactor water effects and nature of the mixture. The study results show that: online ultrasound will reduce the mixture of sludge concentration in the low-frequency power 300W ultrasonic sludge concentration is the most obvious; low-frequency ultrasound causes the relative increase in extracellular polysaccharide in the outer polymer, resulting in mixture viscosity increased, but the increase of viscosity and does not cause deterioration of the filtering properties of the mixture; online ultrasound can reduce the concentration of a mixture of the fluidized bed membrane bioreactor soluble microbial products, and to avoid the membrane module for dissolving membrane caused increased pollution of the rejection of the product of the microorganism; the low-frequency ultrasound will cause the decrease of the average particle diameter of the mixture, but only a 300W will cause significant reduction of the mixture of the average particle diameter; concentration of sludge caused by the ultrasonic decrease mixture viscosity increased and the supernatant SMP concentration reduction is the the mixture other changes in properties caused by fundamental reason. Line ultrasonic acoustic fluidized bed MBR membrane fouling has a significant control effect; the online ultrasound can improve the fluidized bed MBR membrane flux system after 31 days of running in the low-frequency, power 300W ultrasound, ultrasonic flow low-bed MBR membrane flux attenuation than conventional fluidized bed MBR 9%; online ultrasound can significantly reduce membrane filtration resistance after a cycle of running in the low-frequency power of 200W ultrasound, ultrasound fluidized bed MBR membrane filtration total resistance is 23.6% lower than the ordinary fluidized bed MBR.

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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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