Szybka odpowiedź: A small filter press for a small plant typically uses 320–800 mm plates, 5–40 chambers and 1–20 m² of filter area, dewatering roughly 0.5–5 m³ of thickened slurry per day in manual or semi-automatic operation. Choose it by daily dry solids and cake moisture target, not by slurry flow, and confirm plate size with a filtration test on your own sample.
Najważniejsze dane w skrócie
- Plate sizes: 320, 400, 500, 630, 800 mm
- Filter area: about 1 m² (320 mm, 10 chambers) to 20 m² (800 mm, 30 chambers)
- Cake per cycle: 0.05–0.8 m³ depending on plate size and chamber count
- Typical cycles: 1–4 per day manual, up to 8 with a plate shifter
- Feed pressure: 0.6–0.8 MPa with an AODD pump; up to 1.6 MPa with a screw or piston pump
- Footprint: from about 1.5 × 0.8 m (400 mm press) to 4 × 1.2 m (800 mm press)
Who needs a small filter press
Small filter presses are bought by plants that produce a few hundred kilograms to a few tonnes of dry solids a day: metal-finishing and electroplating shops, small chemical and pharmaceutical batches, stone and ceramic workshops, food and beverage producers, laboratories scaling up, and compact wastewater treatment units at factories, farms and workshops. The common need is the same — turn a wet sludge or slurry into a dry, handleable cake without the cost or space of an industrial press.
Sizing a small press: dry solids first
Size on dry solids per day, then convert to cake volume. A 630 mm plate with a 30 mm chamber holds roughly 0.015–0.02 m³ of cake per chamber; 20 chambers give 0.3–0.4 m³ per cycle. At 65% cake moisture and a cake density of about 1.2 t/m³, one cycle removes roughly 130–170 kg of dry solids. If the plant produces 500 kg of dry solids a day, that press needs three to four cycles — comfortable for a manual unit. Run the same arithmetic for 400 mm and 800 mm plates and you have the size range; a filtration test on your slurry then fixes cycle time and moisture. The method is worked through in jak obliczyć wydajność filtra prasowego.
| Rozmiar płyty | Typowe komory | Obszar filtra | Cake per cycle | Typowe użycie |
|---|---|---|---|---|
| 320 mm | 5–15 | 0.5–2 m² | 0.02–0.06 m³ | Lab, pilot, very small batches |
| 400 mm | 10–20 | 1.5–4 m² | 0.05–0.12 m³ | Workshops, small chemical batches |
| 500 mm | 10–25 | 3–7 m² | 0.1–0.25 m³ | Plating shops, small food plants |
| 630 mm | 10–30 | 4–12 m² | 0.15–0.45 m³ | Small wastewater units, stone workshops |
| 800 mm | 15–40 | 8–20 m² | 0.3–0.8 m³ | Upper end of “small”: compact industrial duty |
Chamber, plate-and-frame or membrane?
Most small presses are recessed-chamber designs with polypropylene plates: robust, cheap to re-cloth and easy to run. Plate-and-frame is chosen when the cake must come out intact or cloths change often — common in food and fine chemical work. Membrane plates are rarely justified at this size unless disposal is charged by weight or the cake is dried afterwards; where they are, the press needs a compressed-air squeeze supply.
Manual, semi-automatic or automatic
Manual presses use a hand or electric hydraulic pump to close and a person to shift plates — fine for one or two cycles a day. Semi-automatic adds electric hydraulic closing and pressure hold, which is the sensible default for most small plants. Fully automatic plate shifting and cloth washing only pay back when the press runs many cycles a day or nobody is on hand to open it.
What the rest of the system needs
A small press still needs a conditioned feed: a small mixing or holding tank, polymer or lime dosing for biological and hydroxide sludges, an AODD or screw pompa zasilająca, a cake bin or bag under the press, and a filtrate return line. Cloth is the main consumable — order a spare set with the press and see Jak często wymieniać tkaninę filtra prasowego.
Indicative cost
Small presses sit at the bottom of the price range: market prices for a manual 400–630 mm press typically run from a few thousand US dollars, rising with plate count, membrane plates and automation. These are indicative market ranges, not a quotation; see cena prasy filtracyjnej według rozmiaru płyty for the full range and send your slurry data for a specific offer.
FAQ Kupującego
What counts as a small filter press?
In practice a press with 320–800 mm plates and roughly 1–20 m² of filter area. Below 320 mm it is a laboratory or pilot unit; above 800 mm you are into standard industrial sizes with 1000–1500 mm plates.
How much slurry can a small filter press handle per day?
A rough guide: a 630 mm press with 20 chambers holds about 0.3–0.4 m³ of cake per cycle; at 3–4 manual cycles a day that is 1–1.5 m³ of cake, or roughly 1–3 m³ of thickened slurry. Exact capacity depends on solids content, cake moisture and cycle time — see the capacity calculation guide.
Do I need automation on a small press?
Usually not. Manual or semi-automatic hydraulic closing with manual plate shifting keeps cost down and is fine for one to four cycles a day. Add an automatic shifter only if the press will run many cycles a day with little supervision.
Which feed pump suits a small filter press?
An air-operated double-diaphragm (AODD) pump is the most common choice: it self-regulates as pressure rises, handles solids and needs no control loop. A small screw pump is used where compressed air is not available or the slurry is very thick.
Ten artykuł jest częścią naszego przewodnika po prasy filtracyjne.