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LoI reduced by air separation

impact air systems zcu

What is your product?

The ZigZag Classification Unit (ZCU) materials separator from Impact Air Systems.

How does it work?

Mixed and/or contaminated material is fed into the system via a belt conveyor and then split using the airflow based on density, size and shape into a stream of heavy and light materials.

Valuable material is separated from low-value material, automat­ically reducing the loss on ignition (LoI). Fully adjustable airflows guarantee optimum separation.

Where would it ideally be used?

This unit is ideal for waste proces­sors, skip companies and end users that want to refine their material or trommel fines to reduce LoI and avoid landfill tax charges. The material typically needs to be below 50mm in size, dry and free flowing.

What benefits does it offer?

Apart from outstanding separation results and a wide range of applications, the unit is compact, with a smaller footprint than our ZigZag separation system, so is ideal when space is at a premium.

It is mostly pre-assembled so can be fitted within a couple of days and is retrofitted easily to an existing system. Internal surfaces are fully treated with durable materials such as Hardox or ceramic linings, ensuring a long life even in the most difficult of applications.

Where has it been used?

We have ZCUs in sites across the world processing glass, plastics, plasterboard, skip waste, oily rags, solid recovered fuel and compost applications. Our most recent installation was at a construction and demolition processing plant at 8-10tonnes/hour.

Any future applications?

We are constantly working with waste processors and sorting plant builders to identify the best way to use air to separate material and overcome common problems. Our innovation team is currently look­ing at air-based solutions for the energy-from-waste (EfW) market.


Depends on the size and options chosen. The return on investment can be as low as six months.

Any savings?

With the huge savings due to the reduction in LoI, resulting in lower landfill tax fees, many cus­tomers say the system pays for itself in a matter of months.

What about maintenance?

Minimal maintenance is required but essential to smooth running, and wear parts need to be replaced as appropriate.

Anything else?

Impact Air has recently been inundated with enquiries for dust control and ventilation systems for recycling facilities and, in particu­lar, EfW and power station sorting facilities. We have been providing such systems in a variety of indus­tries for almost 30 years.

There are many ways that air systems can be applied in the recy­cling sector and we are proving that they have huge benefits.

Impact air systems at a glance

Impact Air Systems is based in the Midlands, with 40 staff and a turnover of £7m-£8m. Its technical services division provides service and maintenance of its air systems, along with specialist technical services such as local exhaust ventilation testing.

With its dedicated teams of sales, design, project managers and technical engineers, Impact Air Systems provides a service from enquiry to commissioning.

Following an increase in enquiries from around the world, the company has recently set up a division in San Diego, US, to service North America, Canada and Mexico.


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