Can a screw conveyor be installed vertically?

Yes, screw conveyors can be installed in horizontal, inclined, or vertical orientations depending on the facility design and operational requirements.

What lining material should be used for conveying grit?

Hardox 400 is recommended for conveying grit as it offers excellent resistance to abrasive wear, helping to extend the service life of the conveyor.

What diameters and lengths are available for screw conveyors?

Screw conveyors are available in diameters ranging from 220 mm to 500 mm and can be manufactured up to 15 meters in length, with custom sizes available upon request.

SCREW CONVEYOR

Q: What does a screw conveyor do in a wastewater plant?

A screw conveyor is used to transport screenings, grit, and sludge from their point of removal to waste containers or downstream processes in a fully enclosed and odour-controlled manner.

An Efficient Way To Move Screening, Grit And Dewatered Sludge.

At Adroit, we design and manufacture heavy-duty screw conveyors specifically for the water treatment and wastewater treatment sectors. Over the past 35 years, we have built our reputation as a supplier of high-quality screw conveyors for municipal and industrial customers throughout India. Our screw conveyors provide an enclosed, odour-free and efficient means of transporting solids in any direction.

What Is a Screw Conveyor?

A screw conveyor is a device that is used to move semi-solid and solid waste from one location to another using a rotating helical screw blade within a tube. It provides a continuous, consistent & reliable means of moving material from one point to another without spillage and with minimal odour. There are two common types of screw conveyors:

Shafted screw conveyor – designed with a screw blade that is wound around a central shaft; typically used for coarser, drier materials.
Shaftless screw conveyor – features an open spiralled design without a central shaft; can transport sticky, stringy or fibrous materials without clogging.

How It Works

A helical screw blade is rotated within a closed tube or an enclosed trough.
The helical screw blade pushes the material forward along the length of the screw with each rotation.
Drive motors drive the screw at one end, while the other end is either free or supported.
The entire unit is designed to completely contain the material, with no possibility of any spillage or odour escaping from the unit.
Screw conveyors can be designed and constructed to be used either horizontally, angled or vertically.

Application

Screw conveyor is used for conveying sludge or solid matter like screenings and grit. It usually consists of a tube containing rotating spiral blade coiled around a shaft, driven at one end and held at the other or a shaftless screw, driven at one end and free at the other.

Screens transport – transporting coarse and fine screenings from bar screens or step screens into waste containers or compactors
Grit conveyance – transferring grit chamber output for dewatering and disposal
Sludge conveyance – transferring dewatered sludge cake from screw presses or centrifuges to the area where sludge will be handled
Industrial bulk transfer of semi-solid and bulk waste from food, chemical and industrial (effluent) manufacturing facilities

Application Area

Features

All enclosed: containing transport controls, odours and preventing spillage in sensitive areas of the plant
Flexible installation: able to be installed/operated horizontally, inclined, or vertically to meet the process flow layout of any plant
Handling of hard-to-handle materials: can effectively move sticky, wet, and fibrous types of waste without plugging other types of conveyors
Low energy use: an efficient drive system allows businesses to maintain low operating costs
Corrosion resistance: made out of SS304 or SS316 stainless steel, allowing long term usage in wet environments
Abrasion resistance lining: designed with UHMWPE, HDPE, or Hardox 400 lining to allow for the grit and abrasiveness of material to be transported
Low maintenance: simply constructed and durable, with little to no moving parts
Customizable: diameter, length, angle and lining for your application’s specific needs

Dimension and Manufacturing

Parameter	Details
Diameter	220 mm to 500 mm
Length	Up to 15 metres
Screw Material	SS304 / SS316 Stainless Steel
Frame Material	SS304 / SS316 Stainless Steel
Lining Options	UHMWPE / HDPE / Hardox 400
Installation	Horizontal / Inclined / Vertical
Customisation	Available as per project requirements

Screw Conveyor vs Belt Conveyor — Which Is Right for You?

Features	Screw Conveyor	Belt Conveyor
Best for	Short to medium distances, odour control	Long distances, high volumes
Odour control	Enclosed — excellent	Open — limited
Material type	Wet, sticky, fibrous & semi solid	Coarse, dry screenings & bulk solids
Installation angle	Horizontal, inclined, vertical	Horizontal or inclined only
Spillage risk	None — fully enclosed	Low with trough design
Maintenance	Simple	Easy to inspect

Frequently Asked Questions About Screw Conveyor

What does a screw conveyor do in a wastewater plant?

The function of a screw conveyor is to convey screenings, grit and sludge from their removal site for delivery to waste containers and/or downstream locations in a fully enclosed and odour controlled way.

Can it be installed vertically?

Screws can be installed at all orientations; therefore, screw conveyors can be installed horizontally, at an angle or vertically depending on the design of your facility.

What lining material should I choose for grit?

When considering what lining material to use for conveying grit, Hardox 400 is recommended since it provides excellent abrasive wear resistance to extend the service life of the conveyor.

What diameters and lengths are available?

The diameter and length of our screw conveyor can be 220 to 500 mm in diameter and an overall length of up to 15 m, with exceptions available upon request.