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1. #PENJELASAN TENTANG ALAT ROTARY VACUM FILTER SERIES#
2. #PENJELASAN TENTANG ALAT ROTARY VACUM FILTER FREE#

10.13) which mechanically advances towards the drum at a controlled slow rate. The cake which builds up on the drum during operation is cut away by the knife blade (Fig. Lem is overcome by precoating the drum with a layer of filter-aid 2 to 10 cm thick. Because the knife is close to the drum, there may be gradual wearing of the filter cloth on the drum. The filter cake which builds up on the drum is removed by an accurately positioned knife blade. Yeast cells can be collected on a filter drum with a knife blade for scraper discharge (Fig.

#PENJELASAN TENTANG ALAT ROTARY VACUM FILTER FREE#

The cake is lifted free from the upper part of the drum when the vacuum pressure is released and carried to the small rollers where it falls free. Cake discharge on a drum using a scraper (Talcott et al., 1980).Īre threaded over the drum and round two rollers.

A, B and C represent dividing members in the annular ring (Miller et al., 1973).įig. Sections 14, 15 and 16 are ready to start a new cycle. Sections 1 to 4 are filtering sections 5 to 12 are dewatering and section 13 is discharging the cake with the string discharge. Diagram of string-discharge filter operation. (iii) Scraper discharge with precoating of the drum.įungal mycelia produce a fibrous filter cake which can easily be separated from the drum by string discharge (Fig. This ensures that there will be clearances of 0.025 mm to 0.25 mm when the rings (22 mm external diameter, 16 mm internal diameter and 0.8 mm thick) are normally made from stainless steel and precision stamped so that there are a number of shoulders on one side. Rings for metafilter (Coulson and Richardson, 1991). A number of rotary vacuum drum filters are manufactured, which differ in the mechanism of cake discharge from the drum:įig. In contrast, pressure filters can be operated at many atmospheres pressure. It should be noted that the driving force for filtration (pressure differential across the filter) is limited to one atmosphere (100 kN m 2) and in practice it is significantly less than this. This washing is carefully controlled so that dilution of the filtrate is minimal. A number of spray jets may be carefully positioned so that water can be applied to rinse the cake. However, just before discharge of the filter cake, air pressure may be applied internally to help ease the filter cake off the drum.

#PENJELASAN TENTANG ALAT ROTARY VACUM FILTER SERIES#

The interior of the drum is divided into a series of compartments, to which the vacuum pressure is normally applied for most of each revolution as the drum slowly revolves (~ 1 rpm). The slurry is fed on to the outside of the revolving drum and vacuum pressure is applied internally so that the filtrate is drawn through the filter, into the drum and finally to a collecting vessel. The filter consists of a rotating, hollow, segmented drum covered with a fabric or metal filter which is partially immersed in a trough containing the broth to be filtered (Fig. Large rotary vacuum filters are commonly used by industries which produce large volumes of liquid which need continuous processing.