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Pneumatically driven doors seal the ends of the chamber to sandwich media over a screen within the housing. Unique inflatable side seals prevent filtration by pass along media sides. Contaminated fluid is pumped into the filter chamber and forced through the media. Clean filtrate is discharged from the bottom section under pressure.
When solids accumulate on the filter media, chamber pressure rises to meet a pre-set limit; the pump then stops and an automatic air blow-down is actuated. This dries the solids and the doors open to introduce fresh media at one end, while discharging the spent media and solids out the other end. Solids are scraped and dropped into a receptacle and the used media is re-wound for easy disposal or re-use.
Performance:
- Sludge removal to less than 50 PPM to maintain phosphate bath at required particle concentration.
- Efficient filtration with automatic self-indexing operation
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- Requires minimal operator intervention
- Special media available
Benefits:
- Strong enough to handle the stress of being re-used and re-wound
- Resistant to the acid cleaning solutions
- The slick surface promotes easy release of the filter sludge cake into the hopper
- The sheer nature and plastic core allow for minimal storage space and cut down on “telescoping” when winding or rewinding
- Plastic core allows for easy media roll change out
Case Study
Filter press from ALSI is also used to remove the phosphate sludge; the main parts are filter plates and cloths.
The filter plates are constructed of a high-density polypropylene, which is extremely resistant to deterioration. Because of this construction, the plates need replacement only if they are damaged by mishandling or abuse.
Cleaning of the cloths, even with the supplied spatula, will cause them to become worn, the filter cloths will become contaminated by small quantity of solids, which penetrate into the cloth fiber. This happens with each cycle, blinding the cloth, which will reduce the efficiency of the presse. The resulting pressure drop occurring across the cloth creates insufficient pressure to compact the sludge. The resulting cake will be soft and non-compacted. When this condition is present, the cloths must be replaced or cleaned.
The applications used in:
- Alkaline/caustic cleaner baths
- Clarifier overflows
- Coolant filtration (oil, water soluble emulsions, and synthetics)
- Diatomaceous earth dewatering
- Filter press replacement
- Metal-working fluids and coolants
- Phosphate stage filtration
- Plating baths
- Replacement of diatomaceous earth filters
- Wastewater treatment systems
Case Study
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