The Study of Simulated Food Processing wastewater treatment Using A Membrane Bioreactor: The effect of BOD and COD Concentrations

• Main Authors: Shih-Min Liang, 梁世旻
• Other Authors: Chih-Jen Lu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/ekkwpv

碩士 === 國立中興大學 === 環境工程學系所 === 101 === This study used Membrane Bioreactor (MBR) to treat the simulated food processing wastewater. The influent and effluent of MBR tank were collected for BOD, COD, and SS analysis. This study used submerged MBR (SMBR) system equipped with PVDF membrane at pore size of 0.03 μm. The glutamic acid and sucrose were used as influent substrate to simulate the soluble organic pollutants in the food processing wastewater. The MBR system was operated at HRT of 48-hours, that was higher then the HRT of a traditional activated sludge system. The effluent of MBR tank was sampled for BOD, COD, and SS analysis. Samples were also directly collected from the MBR aeration tank to be treated in a simulated secondary sedimentation tank. After the sedimentation of 4 hours, the supernatant was used for BOD, COD, and SS analysis. These concentrations were compared to that of MBR effluent. The activated sludge taken from Taichung Futian wastewater treatment plant was used as the seeded microorganisms for this MBR system. The simulated food processing wastewater containing glutamic acid and sucrose at COD of 2000 mg/L was continuously fed into the MBR system at HRT of 48-hours. Sample were periodically collected for pH, DO, ORP, temp and EC analysis. The results showed that pH was in the range of 7.0 ~ 7.9. ORP and DO were always higher than 62 mV and 1 mg/L, respectively. The MLSS in the MBR tank was in the range of 2790~3220 mg/L. The average BOD and COD removal efficiencies were more then 99 %. For the simulated secondary sedimentation tank, the average BOD and COD removal efficiencies were 97 % and 96 %, respectively. However, the clarified SS concentration was 32 mg/L, It was much higher than that in the MBR effluent (N.D. ~ 4 mg-SS/L). Thus, it was found that the MBR system demonstrated better BOD, COD, and SS removals for food processing wastewater treatment in comparison with the traditional activated sludge system.