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Study on Dye Wastewater Treatment with the New Membrane Bioreactor

Author: LiuJianBo
Tutor: LiJinCheng
School: Qingdao Technological University
Course: Environmental Engineering
Keywords: Printing and dyeing wastewater MBR PAC membrane flux
CLC: X703.1
Type: Master's thesis
Year: 2010
Downloads: 77
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Abstract


Printing and dyeing wastewater possesses large changes in water quality, components of complex, high-chroma and high concentrations of organic matter. It is difficulty to be treated in industrial wastewater. New type of membrane bioreactor treated printing and dyeing wastewater by the anaerobic treatment of anaerobic pool, integrated processing of aerobic activated sludge and PAC, and the filtration of hollow fiber membrane. Finally, analyzed and studied the results of experiment.When the content of dye concentration, other nutrients and trace elements was in the same conditions, before and after dosing PAC, removal effect of COD was good in anaerobic supernatant,aerobic supernatant and out flow of water. Increasing the powdered activated carbon only slightly increased the decarburization capacity, and was not obvious on the role of COD removal.Through the degradation of anaerobic-aerobic-membrane filtration, the concentration of COD reduced significant- ly. After running stable, the removal rate of COD about anaerobic treatment was 50% -54%, the removal rate of COD about aerobic treatment was 39% -41%, the removal rate of COD about membrane filtration was less than 3%. The larger contributions to the COD removal were the anaerobic treatment and aerobic treatment.When the content of dye concentration, other nutrients and trace elements was in the same conditions, After dosing PAC to the MBR, the chromaticity of the anaerobic supernatant did not reduce significantly, but the chromaticity of the aerobic supernatant and water reduced significantly.Through the degradation of anaerobic- aerobic-membrane filtration, the chromaticity reduced significantly. After running stable,the removal rate of the chromaticity about anaerobic treatment was 56% -64%, the removal rate of the chromaticity about aerobic treatment was 29% -32%, the removal rate of the chromaticity about membrane filtration was less than 5%.The larger contributions to the removal of the chromaticity were anaerobic microbial treatment of the anaerobic tank and the integrated treatment of activated sludge with PAC in the aerobic reactor.The removal effect of the turbidity about hollow fiber membrane was very good. Before and after dosing PAC, the water turbidity had not significant change. The retention rate of SS about hollow fiber membrane was close to 100%. There was a small amount of black flocculent sludge in the upper part and most of dark granular sludge in the anaerobic tank. Before dosing PAC, aerobic activated sludge scattered loose, and floc shape was smaller. After dosing PAC, the particle state of aerobic activated sludge had changed. Observed that activated carbon particles as the core of black sludge. The larger Zoogloea tightly linked into an entirety and each composed of dispersed granular structure.Pumping and discontinuity time set to 15min +6 min, and aeration set to 46L/min. Improved the liquid flow rate in a turbulent state through the aeration, to a better mix of high concentration of membrane surface and mainstream concentration. The early stages of the trial operation, the operational negative pressure controlled as -0.013MPa, after running stable, the operational negative pressure added to -0.025 MPa. During the experiment, membrane flux reduced significantly with the extension of the system run-time in the beginning, hereafter membrane flux became stable. The stable membrane flux became larger after dosing PAC than no dosing. Followed by water erosion、alkaline wash、pickling and NaClO aqueous solution cleaning to membrane, membrane flux showed varying degrees of restoration and restored to 85% -95% of clean water flux of the new film finally.

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