{"id":2083,"date":"2025-05-08T06:26:39","date_gmt":"2025-05-08T06:26:39","guid":{"rendered":"https:\/\/lowayequipment.com\/?page_id=2083"},"modified":"2026-09-22T07:59:11","modified_gmt":"2026-09-22T07:59:11","slug":"dewatering-screw-press","status":"publish","type":"page","link":"https:\/\/lowayequipment.com\/pt\/dewatering-screw-press\/","title":{"rendered":"Dewatering Screw Press"},"content":{"rendered":"\t\t
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\n \"Loway\n
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\n Screw press dewatering<\/span>\n

Dewatering Screw Press for Municipal, Industrial and Oily Sludge<\/h1>\n

Loway builds the multi-disc screw press that thickens and dewaters in one enclosed unit. It runs 24\/7 with no filter cloth to wash, no batch cycle to plan around, and one operator check per shift.<\/p>\n

\n Request a technical proposal<\/a>\n See the 6-stage process<\/a>\n <\/div>\n

Reviewed by the Loway engineering team · Updated September 2026 · 25+ years in solid-liquid separation<\/p>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Where it fits<\/span>\n

What a Screw Press Dewatering Line Solves<\/h2>\n

Four reasons plants choose a multi-disc screw press over a batch filter press or a decanter centrifuge — and what each one changes on site.<\/p>\n

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01<\/div>\n

Continuous, not batch<\/h3>\n

Sludge in, cake out. There is no fill-and-squeeze cycle to schedule, so the press can run unattended overnight and on weekends.<\/p>\n <\/div>\n

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02<\/div>\n

No filter cloth<\/h3>\n

Fixed and moving rings do the filtering. Nothing to blind, wash or replace, and no high-pressure wash water system to maintain.<\/p>\n <\/div>\n

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03<\/div>\n

Low speed, low power<\/h3>\n

The shaft turns at 1–5 rpm. Installed power runs 0.75–7.5 kW by model, well under a centrifuge on the same duty.<\/p>\n <\/div>\n

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04<\/div>\n

Oily sludge included<\/h3>\n

The chamber is enclosed and the gaps self-clean. Oily sludge screw press duty is a routine application, not an exception.<\/p>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Working principle<\/span>\n

How Screw Press Dewatering Works, Zone by Zone<\/h2>\n

Sludge travels through one dewatering screw press drum and leaves as stackable cake. Six zones do the work, in this order.<\/p>\n

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1<\/span>

Feed & conditioning<\/h3>

Sludge enters the flocculation tank, polymer is dosed inline, and flocs form before the drum.<\/p><\/div><\/div>\n

2<\/span>

Thickening<\/h3>

Free water drains through the ring gaps as the pitch spacing begins to close.<\/p><\/div><\/div>\n

3<\/span>

Compression<\/h3>

The tapered shaft and narrowing cage build pressure; moving rings shear the floc and release water.<\/p><\/div><\/div>\n

4<\/span>

High-pressure extrusion<\/h3>

At the discharge end the back-pressure cone sets final cake dryness against the torque limit.<\/p><\/div><\/div>\n

5<\/span>

Cake discharge & filtrate<\/h3>

Cake leaves at 18–28% DS, stackable and non-sticky. Filtrate returns to the head of the plant.<\/p><\/div><\/div>\n

6<\/span>

Automatic cleaning<\/h3>

Programmable nozzles wash the ring gaps on a timer, so hydraulic capacity stays where it started.<\/p><\/div><\/div>\n <\/div>\n

\n \"Cross-section\n

One drum, six zones: conditioning, thickening, compression, extrusion, discharge, cleaning.<\/p>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n The machine<\/span>\n

Inside a Loway Multi-Disc Screw Press<\/h2>\n

Four assemblies decide how a dewatering screw press performs over a 15–20 year service life.<\/p>\n

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\n \"Fixed\n
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Dewatering drum<\/h3>\n

Fixed and moving rings alternate around the shaft. The moving rings oscillate and clean the filter gaps on every rotation, which is why oily sludge runs without blinding.<\/p>\n <\/div>\n <\/article>\n

\n \"Variable\n
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Screw shaft<\/h3>\n

CNC-machined flights with a pitch that narrows toward the outlet. Compression stays even along the drum instead of spiking at one point.<\/p>\n <\/div>\n <\/article>\n

\n \"Back-pressure\n
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Back-pressure cone<\/h3>\n

The cone at the discharge sets final cake dryness. Operators trade a little dryness for torque headroom when the feed thickens.<\/p>\n <\/div>\n <\/article>\n

\n \"PLC\n
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PLC control panel<\/h3>\n

Every automatic screw press leaves with screw speed, polymer dosing and wash cycles on one screen, plus torque and filtrate turbidity feedback. Recipes for several sludge types store separately.<\/p>\n <\/div>\n <\/article>\n <\/div>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Performance<\/span>\n

Figures From Factory Tests and Commissioned Units<\/h2>\n

Ranges below come from Loway factory acceptance tests and commissioned installations. Treat them as a starting point and confirm against your own sludge in a bench or pilot test<\/a>.<\/p>\n

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18–28%<\/div>
Cake solids (DS), by sludge type and polymer dose<\/div><\/div>\n
≥95%<\/div>
Solids capture rate with correct conditioning<\/div><\/div>\n
0.75–7.5 kW<\/div>
Installed power across the model range<\/div><\/div>\n
3–8 kg\/t DS<\/div>
Polymer dose, 40–60% below belt press dosing<\/div><\/div>\n <\/div>\n

Feed concentration, polymer choice and sludge age move these numbers more than the model number does.<\/p>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Model range<\/span>\n

Screw Press Dewatering Machine Range and Capacity<\/h2>\n

Capacity follows feed concentration, not model size alone. Read across the row: the same LWSP-302 that handles 16 t\/h at 5,000 mg\/L handles 2.4 t\/h at 50,000 mg\/L.<\/p>\n

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Model<\/th>DS capacity<\/th>Sludge treatment capacity (t\/h) by feed concentration<\/th><\/tr>\n
5,000 mg\/L<\/th>10,000 mg\/L<\/th>20,000 mg\/L<\/th>30,000 mg\/L<\/th>40,000 mg\/L<\/th>50,000 mg\/L<\/th><\/tr>\n<\/thead>
LWSP-101<\/strong><\/td>4 - 8 kg\/h<\/td>0.8<\/td>0.5<\/td>0.3<\/td>0.25<\/td>0.2<\/td>0.1<\/td><\/tr>\n
LWSP-131<\/strong><\/td>6 - 15 kg\/h<\/td>1.6<\/td>1.2<\/td>0.7<\/td>0.5<\/td>0.3<\/td>0.2<\/td><\/tr>\n
LWSP-132<\/strong><\/td>15 - 25 kg\/h<\/td>3.0<\/td>2.0<\/td>1.4<\/td>1.0<\/td>0.7<\/td>0.5<\/td><\/tr>\n
LWSP-201<\/strong><\/td>15 - 20 kg\/h<\/td>3.0<\/td>1.8<\/td>1.5<\/td>1.0<\/td>0.6<\/td>0.3<\/td><\/tr>\n
LWSP-202<\/strong><\/td>30 - 45 kg\/h<\/td>5.0<\/td>3.0<\/td>2.8<\/td>1.9<\/td>1.2<\/td>0.6<\/td><\/tr>\n
LWSP-203<\/strong><\/td>30 - 60 kg\/h<\/td>9.0<\/td>6.2<\/td>4.0<\/td>2.8<\/td>1.6<\/td>0.8<\/td><\/tr>\n
LWSP-301<\/strong><\/td>50 - 70 kg\/h<\/td>9.0<\/td>6.0<\/td>3.0<\/td>2.5<\/td>1.8<\/td>0.9<\/td><\/tr>\n
LWSP-302<\/strong><\/td>100 - 140 kg\/h<\/td>16.0<\/td>12.0<\/td>6.0<\/td>4.8<\/td>3.5<\/td>2.4<\/td><\/tr>\n
LWSP-303<\/strong><\/td>150 - 210 kg\/h<\/td>25.0<\/td>18.0<\/td>9.0<\/td>7.0<\/td>4.5<\/td>3.5<\/td><\/tr>\n
LWSP-304<\/strong><\/td>200 - 280 kg\/h<\/td>35.0<\/td>24.0<\/td>12.0<\/td>9.5<\/td>6.0<\/td>4.8<\/td><\/tr>\n
LWSP-401<\/strong><\/td>140 - 200 kg\/h<\/td>30.0<\/td>18.0<\/td>10.0<\/td>6.0<\/td>3.5<\/td>3.0<\/td><\/tr>\n
LWSP-402<\/strong><\/td>250 - 350 kg\/h<\/td>60.0<\/td>30.0<\/td>15.0<\/td>10.5<\/td>7.0<\/td>6.0<\/td><\/tr>\n
LWSP-403<\/strong><\/td>320 - 500 kg\/h<\/td>90.0<\/td>45.0<\/td>23.0<\/td>16.0<\/td>11.5<\/td>9.0<\/td><\/tr>\n
LWSP-404<\/strong><\/td>500 - 700 kg\/h<\/td>120.0<\/td>60.0<\/td>32.0<\/td>20.0<\/td>16.0<\/td>12.0<\/td><\/tr>\n<\/tbody><\/table><\/div>\n

Guidance figures for steady feed at the stated concentration. Every dewatering screw press is finally sized from a sludge test — see how we select between technologies<\/a>.<\/p>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Specification<\/span>\n

Operating Window and Built-to-Order Options<\/h2>\n

Every screw press dewatering machine leaves the factory set for a sludge. These are the boundaries we design inside.<\/p>\n

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Operating window<\/h3>\n