| This paper was studied on simulated wastewater by using submerged hollow fiber hanging curtain membrane bioreactor. Various influencing factors were reviewed by a series of operational condition and parameters and analyzing status according to hanging curtain membrane module running in the simulated wastewater. Optimized design to operational condition and parameters was put forward emphatically. The results under different operating conditions showed that the effluent qualities and effect of treatments of the MBR were the best while the ratio of A/W at 25:1,the amount of aeration was 3.0m3/h,the MLSS was at 4~5g/L,HRT was at 6~10h, the temperature of mixed solution in the aeration was 30癈,the range of dissolved oxygen concentration was 2.0~3.5mg/L, pH was 6.5~8.0,the even small air bubble was came from agglomeration pipe. And the average effluent removal efficiency of CODcr and BOD5 were respectively 98% and 99%, the concentration of effluent BOD5 was evenly less than 10mg/L, the average turbidity of effluent was 0.297NTU,proved that without man-made letting sludge was accomplished on feasibility and high effective retaining feature of hanging curtain was represented.The space between clapboards that placed the sides of membrane module and paralleled has great effect on the removal effect of the whole system based on experiments, it was found that the process of fultative aerobic-aerobic- fultative aerobic was happened and has some features of A/O. The removal effect was good while the space between clapboards was 0.10m,especially it improved the removal effect of nitrogen and phosphate, the removal efficiency of NH3-N increased from 89% to 92%, the removal efficiency of total phosphate raised from the maximum of 81% to the average of 83%, thus it can been seen that MBR took on the character of nitrogen compounds and phosphate removal, provided reference for MBR to realize phosphate removal at a longer sludge retention time and optimization method and engineering parameters for MBR to obtain actual propagations and application.The attenuation of membrane flux was also studied in this dissertation. The data showed that membrane flux after using decreased the third that of initial and explained membrane was polluted very severely. Changing orientation was in favor of alleviating the attenuation of membrane flux and membrane flux of unit of membrane area of membrane module advanced4.5L/(m2 h) averagely. Scan electron microscope was employed to observe and analyze theinner of hollow fiber membrane and made know that the pollution of membrane was changed constantly, that of practical pollution state had the relation with the temporal operation condition and the character of mixed solution, the axial feature of hollow fiber membrane thread, the length and diameter of hollow fiber membrane thread, this aspect was under study.This paper also had a pilot study on wastewater of immersed thread that rooted in dealing with additive in the process of PVDF filature adopting MBR. At first the wastewater was carried through applying to anaerobic biological treatment and obtained excellent removal effect, the concentration of CODcr decreased from 31160mg/L tol082mg/L. After arriving at the aim of some certain degrading degree, then came into MBR system, aerobic biological treatment was done, the average removal efficiency of CODcr and BOD5 were respectively 93% and 99.3%, the average effluent concentration value was CODcr 89mg/L, and the turbidity was averagely less than 1 .ONTU.The primary experiment proved that wastewater from filature hard to degrade could be applied to MBR tried by secondary anaerobic biological treatment, this feasible method could be reference technics and use for factual treatment of wastewater from filature. |
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