Galigani Filtri
Filter presses and sludge pumps
Galigani Filtri of Tuscany has operated since 1958 and has over 3000 installations on five continents, including over 1000 in electroplating, anodizing and vibratory finishing. It makes filter presses and the pump units that feed them: from presses with manual discharge to fully automatic, PLC-controlled ones that work with other equipment in the process and can be supervised remotely. The company has its own laboratory, where it tests filtration parameters on the customer's samples and selects the right press size.
A filter press separates solids mechanically, so the liquid does not change its chemical composition. It works in cycles: capacity depends on the filtration area, while the amount of retained sludge depends on the chamber volume. In a plating shop wastewater treatment plant it is the best way of dewatering sludge: the press stands on a raised platform and drops a cake with a dry solids content of at least 30% straight into a container or onto a lorry, instead of tanker removal of sludge with 5 to 6% dry solids.
Filter presses
| QUICK DRY | Semi-automatic: the automation runs all filtration phases, the operator discharges the sludge. Welded carbon steel frame, central sludge feed, filtrate discharge via an open channel or closed manifold. Polypropylene plates, cloths selected to suit the process. Sizes 320 to 1000 in the HD version with a motorized hydraulic unit and automatic clamping pressure make-up, and for simpler applications in the HMD version with a manual unit and screw lock. |
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| SIMULTANEOUS | Fully automatic, PLC-controlled, for short and medium cycles. All plates open at the same time (long-stroke cylinder), so cake discharge is quick. The lowest-cost option among automatic presses; available with PP or membrane plates. |
| MATCHLESS | Fully automatic, for medium and long cycles and large quantities of solids. Cakes drop one after another, plate by plate, and a programmable shaking system on each plate helps release them. Filtrate discharge via a stainless steel channel, with optional membrane plates for better dewatering. |
All presses have a fully enclosed filter pack and moving parts, accessible only through electrically interlocked sliding doors. Options: raised-leg frame, all-stainless-steel construction for acidic environments, rotating stainless steel tray, pharmaceutical versions. The GCS (Galigani Check System) detects irregularities, and the GRS (Galigani Remote System) lets Galigani service connect to the machine remotely.
Press feed pumps
| Diaphragm and piston pumps | Pneumatic diaphragm and piston pumps for lower capacities and hydraulic piston pumps (oil unit on the pump) for higher ones. High-strength cast iron body, stainless steel piston with ceramic spray coating, ball valves, control cabinet. Continuous feeding of sludge at the maximum current pressure gives better cake dewatering; the pumps can also be fitted to older presses. |
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| Piston-diaphragm pumps | For abrasive sludges: crank in an oil bath, bronze piston, acid-resistant diaphragm and stainless steel compensation tank. The oil separates the moving parts from the pumped liquid, which extends service life. |
