Screw Separator 5.5 kW

The 5.5 kW screw separator separates digestate, liquid manure and organic suspensions into solid and liquid fractions. It is used at biogas plants, livestock farms and food processing facilities. Mechanical liquid separation enables the fractions to be stored and processed separately.

Cattle manure throughput is 15–35 m³/h. The separated solids contain 30% dry matter, corresponding to 70% moisture. Actual throughput and dewatering depend on the feed material, its dry matter content and the screen installed. Performance with digestate and other organic suspensions depends on the properties of the material being processed.

Operating principle

Premixed material enters the separator chamber. A rotating screw conveys it along the screen. Liquid passes through the screen slots and is discharged separately, while retained solids move towards the discharge zone. Compaction mechanically presses liquid out of the material. The solid fraction leaves the separator as a separate stream, ready for collection or further conveying.

Screens with slot widths from 0.3 to 1.0 mm adapt separation to the feedstock. Narrower slots retain finer particles, while wider slots change the balance between throughput and solids separation. Preparing a homogeneous suspension before feeding promotes uniform separator operation.

Construction

The housing is made of AISI 304 stainless steel. The working screw has a wear-resistant carbide coating, and the screen is made of stainless steel. The replaceable screen allows servicing and selection of a suitable slot width without replacing the complete unit.

A geared motor drives the screw to convey and compact the material. The support structure positions the separator for unobstructed solids discharge. The electric drive is operated through the control cabinet.

Biogas plant digestate

After anaerobic digestion, the separator removes part of the organic solids from liquid digestate. The solid fraction can be composted, stored or further processed into organic fertilizers. The liquid fraction is collected in tanks for subsequent use or treatment.

Separate handling allows different transport methods: loaders and trailers for solids, pumps and tankers for liquids. This helps organize digestate storage and reduces the liquid transported with the solid material.

Livestock farming and industry

On livestock farms, the separator processes previously homogenized liquid manure. The resulting fractions can be used for further organic fertilizer production. After appropriate treatment, the solid fraction can also serve as a raw material for animal bedding.

In the food industry, the unit separates organic solids from liquids, including vegetable residues and pulp-like materials. In wastewater handling, the separator can provide preliminary mechanical dewatering of suitable organic sludge.

Maintenance

Regular screen cleaning and screw inspection maintain throughput. Monitoring the wear-resistant coating and servicing the drive in good time help maintain separation quality. Stainless steel working parts are easy to clean, and replaceable components allow maintenance without replacing the entire unit.