Comparison of Cross-Flow Filtration Media

Release time:

2022-06-23

When filtering tap water, using microporous media can achieve a very high flow rate. However, when filtering suspensions, the microporous media quickly becomes clogged, and the flow rate drops below that of the membrane.

Comparison of filtering media

When filtering tap water, using microporous media can achieve a very high flow rate. However, when filtering suspensions, the microporous media quickly becomes clogged, and the flow rate drops from a higher value to below that of the membrane. For example, when filtering a suspension containing 0.9% kaolin, with a pressure of 0.4MPa and a temperature of 25℃, the flow rate was 10625px/s, and the following test results were obtained:

(1) When using microporous media AN450, after filtering for 30 minutes, the flow rate dropped from the initial value of 1400px/h to 1125px/h;

(2) When using microporous media AN1200, after filtering for 60 minutes, the flow rate dropped from the initial value of 1400px/h to 850px/h. Additionally, when backwashing the microporous media at regular intervals, a very high and stable flow rate was achieved.


 

Concentration

Cross-flow filtration is very suitable for medium concentration suspensions, where the flow rate decreases moderately with increasing concentration.

Geometric conditions of the channel

The geometric conditions of the channel in the plate and frame filter chamber are listed in the table (filter chamber table), and their impact on cross-flow filtration can be seen in Table 1, where filter chambers with smaller channel dimensions have significantly higher flow rates; filter chamber No. 3 is an example.

                      

Table 1 Flow rates of different channels

Filter chamber number

Permeation flow rate/cm • h-1

Tap water

Milk

Kaolin suspension

2

23.3

5.3

 

3

28.037.535.0

11.212.912.9

33.6

4

18.04.0

3.223.0

15.0

 

Continuous concentration of kaolin suspension using microporous media

The microporous media used in the experiment were AN200 (0.2μm) and N450 (0.45μm), respectively installed in filter chamber No. 4 as shown in the table (filter chamber table). The pump continuously circulated a suspension containing 1% kaolin in the filter chamber, achieving thickening by continuously discharging the filtrate and returning the concentrate to the feed tank.

 

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Cross-flow filtration filtrate flow rate and purity

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Using dynamic membrane cross-flow filtration for oil emulsions

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