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1,3 - propanediol fermentation broth filtration sterilization process of membrane fouling and regeneration


Flux relations can be seen from Figure 2,[link widoczny dla zalogowanych], in the constant surface velocity and operating temperature conditions, pressure 0.1 ~ 0.21MPa little effect on the membrane flux. And when the surface velocity is low, little quantitative high pressure through the membrane. This is mainly because the fermentation broth of bacteria and residual sugar and other substances in the membrane surface layer has a compressibility of the gel, the gel was formed at high pressure dense layer of the gel layer of the larger filtration resistance and increase membrane contamination. It was found that high pressure operation and then converted to low-voltage operation,[link widoczny dla zalogowanych], the membrane flux is no longer recover,[link widoczny dla zalogowanych], and the first low-voltage operation for high voltage operation further, better reproducibility of the experiment, which strongly suggests a significant increase in high-pressure operation membrane fouling. Also, in theory, for the control of gel layer resistance during microfiltration, gel layer on the flux density is greater than the pressure to increase the driving force of the impact of increasing the membrane flux. �� L6 �� Henan Chemical HENANCHEMICALINDUSTRY2009 Vol 26 Day �� \ roundworm a gift Note: 4h added deionized water when the metal film in Figure 3, the flux curve under different pressures can be seen from Figure 3, in the case of fixed surface velocity, metal film under the conditions of pressure 0.28MPa, the initial membrane flux is not high, but the flux can be maintained at a high level for a long time, and additional deionized water to restore the flux to maintain a longer period of time, and the relatively high total amount of filtrate. Pressure of 0.36MPa in the metal film under the conditions of higher initial flux, but not long maintained, the flux decreased quickly, and in additional deionized water, the membrane flux less recovery , and the very short time had asked to drop to the point where the regeneration of the membrane, the overall filtration efficiency decreased. 3, membrane cleaning and regeneration seen from the above situation, the membrane is the major source of pollution and bacterial cell autolysis matter, Ca, Mg and other ions, so when the flux dropped to a certain value, it should be cleaned on the membrane and regeneration. Choose an appropriate cleaning method, the regeneration of the membrane is critical. 3.1 The different cleaning methods on the membrane regeneration discussed the method of cleaning contaminated, has used the 2% NaOH, 2% NaOH +1% HNO3, 1% NaOH +0.05% EDTA,[link widoczny dla zalogowanych], 1% NaOH +0. 05% EDTA +0.5% HNO3 four cleaning methods such as membrane regeneration were compared, the results shown in Figure 4. 1.2% NaOH2.2% NaOH +1% HNO3'3 .1% NaOH +0.05% EDTA4.1% NaOH +0.05% EDTA +0.5% HNO3 Figure 4 metal films under different conditions cleaning and regeneration of Figure 4 shows the results of Scenario 2 is best, then the gap between the two with Option 2 is not significant. HNO in industrial applications because the human body has some potential danger, so we selected Option 3 as the normal cleaning methods. Pollution is very serious in the selection of Option 4 after the regeneration program. 3.2 The effect of temperature on the membrane regeneration This paper examines the impact of temperature on the cleaning results, as shown in Figure 5, using a 1% NaOH and 0.05% EDTA mixture used as a cleaning agent, is conducive to reduce the temperature membrane regeneration time, and the membrane flux recovery are better. But when the temperature is higher than 60 ��, the regeneration time is almost equal to the amount of flux recovery is also very basic. �� g �� \ delete time / h Figure 5 at different temperatures when the membrane flux with time cleaning the curve 4 Conclusion The test showed that the temperature of the high concentration of the concentrated solution viscosity of greater impact, raising the temperature can reduce the concentrated solution viscosity, effectively slowing the rate of membrane fouling,[link widoczny dla zalogowanych], experiments show that the optimum temperature is 60 ��, and then raise the temperature had little effect on the membrane filtration, and the cause of energy waste. Pressure on membrane fouling have a considerable impact, the initial pressure can improve the initial membrane flux, but flux decreased rapidly with time, indicating more membrane fouling. Improve the membrane surface film flow while reducing pressure will help reduce membrane fouling. The best solution is to pre-membrane filtration with high flow low pressure, when the flux increased after declining in the appropriate membrane pressure, help to improve the handling capacity and efficiency of the membrane. Membrane cleaning of contaminated areas should be treated in two, Et regular membrane cleaning with 1% NaOH and 0.05% EDTA mixed solution of cleaning film 30min, then rinse with deionized water. Such as the use of routine methods can not achieve good results after another on the basis of daily cleaning with cleaning solution, 0.5% HNO 5min, the membrane flux can be quickly restored.
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