![]() The filter drum is a maze of pipe work running from a metal screen and wooden skeleton and connecting to a rotating valve port at each end of the drum. ![]() The cloth will (with proper care) last several hundred to several thousand hours, depending on the cloth selected, the conditioning chemical, backwash frequency, and cleaning (i.e., acid bath) frequency. The installation of a blanket requires several days. In the belt filter, the cloth is stretched over the drum and through the pulley system. On the drum filter, the cloth is stretched and secured to the surface of the drum. 17.6.7.1.1 Filter Mediaĭrum and belt vacuum filters use natural or synthetic fiber materials. This bar primarily aids in maintaining belt dimensional stability. This type of filter normally has a small-diameter curved bar between the point where the belt leaves the drum and the discharge roll. The media are then returned to the drum and to the vat for another cycle. The media on a belt filter leave the drum surface at the end of the drying zone and pass over a small-diameter discharge roll to aid cake discharge. The coil filter has been used successfully for all types of sludges however, sludges with extremely fine particles or ones that are resistant to flocculation dewater poorly with this system. The coils are then washed and reapplied to the drum. After a dewatering cycle, the two layers of springs leave the drum bed and are separated from each other so the cake is lifted off the lower layer and discharged from the upper layer. The coil type of vacuum filter uses two layers of stainless steel coils arranged in corduroy fashion around the drum. As the drum rotates, each section is thus connected to the appropriate service. ![]() This plate rotates in contact with a fixed valve plate with similar parts, which are connected to a vacuum supply, a compressed air supply, and an atmosphere vent. The drum is divided lengthwise into a number of sections that are connected through internal piping to ports in the valve body (plant) at the hub. The rotary drum filter consists of a cylindrical drum rotating partially submerged in a vat or pan of conditioned sludge. The three principal types of rotary vacuum filters are rotary drum, coil, and belt. ![]()
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