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

Study on Operating Characteristics of Flat-Sheet Membrane Bioreactor under Different Water Quality and Membrane Materials

Author LiuJiangFeng
Tutor WuZhiChao
School Tongji University
Course Environmental Engineering
Keywords Flat Membrane - bioreactor Membrane material High-throughput Membrane filtration performance Slightly polluted source water Powdered Activated Carbon A high concentration lees wastewater Carbohydrate Extracellular polymeric Membrane fouling
CLC X703
Type Master's thesis
Year 2007
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Film - bioreactor is a new type of sewage treatment and reuse technology combined membrane separation and Biotechnology, have received widespread attention in recent years in basic research and practical engineering applications. By the group on the work arrangements in order to promote the flat membrane - bioreactor in municipal wastewater treatment engineering applications, on the basis of the results of the research group preliminary studies, carried out for different membrane pore size and different non-woven high-throughput flat sheet membrane material research and high-throughput Flat Membrane - bioreactor for domestic wastewater treatment, flat sheet membrane for different processing objects - bioreactor treatment of slightly polluted source water and high concentrations of lees Wastewater main content and the results are as follows: 1) conduct a pilot study of the high-throughput flat membrane material. Experimental results show that: the different membrane pore size and non-woven flat membrane by the high throughput 30L / m 2 ยท h run when there is a big difference in the membrane filtration performance 6 < / sup> film (domestic non-woven), imitation 6 # (1) film 2 # latest film (imported non-woven) its operating characteristics and suitability in MBR project with the promotion of the film. Domestic MF membrane in the film forming process, the accuracy of control of the pore size is not a good grasp may cause a great difference in the same nonwoven fabric film its filtering performance. Investigated based on high-throughput Flat Membrane - bioreactor for domestic wastewater treatment pilot study, the experimental results show that: the system the COD Cr , the NH 4 -N removal and effluent COD Cr 50mg / L the COD Cr removal rate in the 85% to 99% between. Due to the high concentration of the sludge, under the control of the appropriate DO system to achieve the effect of simultaneous nitrification and denitrification, a certain degree of removal of total N removal rate of between 20% to 70%, the average removal was 38.7%. 2) Flat Membrane - bioreactor purify slightly polluted source water. The experimental results show that: the hydraulic retention time (HRT) of 1.5h, the system of water bodies pollutants of COD of Cr , the of COD Mn TOC and NH , -N removal. Effluent COD Cr lower than 15mg / L, the average removal rate was 78.7%; the effluent NH 4 -N lower than 0.5 mg / L, The average removal rate of 90.2%; the UV 254 removal rate is lower, the average removal rate of 34.6%. 3) examine the flat membrane - bioreactor purifying micro-polluted source water system sludge mixture extracellular polymeric substances (EPS) relationship between concentration and membrane fouling. The results show that: the The EPS concentration membrane fouling no linear relationship, the choice of running flux is a major cause of the three conditions of this study, the degree of membrane fouling different. 4) the effects of powdered activated carbon dosing flat membrane. Bioreactor process to remove the effect of slightly polluted source water. The results show that: due to the strong adsorption capacity of the activated carbon, activated carbon dosing system in water COD Mn , TOC and UV 254 removal efficiency greatly improved removal rates were increased by 10.3%, 6.8% and 26.2%, respectively, while 4 -N removal effect of COD Cr and NH little. 5) Aerobic Plate Membrane - bioreactor preliminary study of the high concentration lees wastewater. The experimental results show that: the system for different the of COD Cr high concentration of water concentration lees wastewater removal. HRT of 24.4h, influent COD Cr 4000mg / L, 2000mg / L, 1000mg / L case, the effluent COD Cr ranged from 30mg / L ~ 180mg / L; ranged between 10mg / L ~ 100mg / L; between 40mg / L ~ 100mg / L between. The average effluent respectively to 70.9mg / L, 43.5 mg / L 57.1 mg / L. The average removal rates were 98.2%, 98%, 94.1%, respectively. The HRT 12.2h, influent the of COD Cr 2000mg / L, 1000mg / L case, the the effluent the of COD Cr , respectively, between 30 mg / L ~~ 250mg / L between; between 5mg / L ~ 80mg / L. The average effluent were 117mg / L, 35mg / L. The average removal rates were 96.8% and 94.2%, respectively. 6) Aerobic Plate Membrane - bioreactor treatment of high concentration lees wastewater sludge mixture very different nature and general aerobic MBR treatment of domestic sewage mixture of nature, the nature of the membrane surface contaminants. Processing the lees wastewater of high concentration, the mixture and the sugar content of the membrane surface is higher compared to the treatment of domestic sewage. Viscosity In this study, aerobic flat membrane - processing high concentration lees wastewater system membrane fouling major factors influencing bioreactor.

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