Waste Management In Action

Aqseptence Group dewaters waste

Filtration equipment supplier Aqseptence Group explains how its specialised Contra-Shear Milliscreens dewater waste, offering a flexible and efficient separation solution. 

Johnson Screens’ manufacturing model centres around adaptability, with most of its trommel screens designed in accordance with customer specifications. 

Starting with a standard base, the company works with customers to ascertain their application requirements, focusing on screening solutions for liquid/solid separation.

Manufacturing screens at its Brisbane factory since 1991, the company collaborates directly with designers to equip the waste industry with specialised trommels, offering installation, servicing and spare parts. 

Johnson Screens was acquired by Aqseptence Group in 2013, with both companies driven to create a sustainable balance between cost-effectiveness and environmental outcomes through the development of separation technology and water filtration. 

Johnson Screens’ latest development is the Contra-Shear Milliscreen, a trommel designed for dewatering and continuous operation. 

The self-cleaning, internally fed rotary system has the ability to handle fine and coarse material, facilitating solids separation for a range of waste applications, but particularly suited to organic waste. 

Phil Amor, Business Development Manager of Aqseptence Group, says the trommel offers waste producers flexibility, which they can then turn into profits.

The food and beverage industry is one of Johnson Screens core customer bases, with the Contra-Shear Milliscreen being used to separate waste streams and remove water from food waste material.  

This dewatered material can then be utilised by recyclers in direct land application or composting, creating the possibility of a profitable alternative revenue stream. 

The Contra-Shear Milliscreen has a screening capacity from 12 to 3500 cubic metres per hour and rotates on four pivot points.

The main screen drum is constructed with Vee-Wire, a unique Johnson Screens design made by welding patented V-shaped wire onto various sizes and shapes of support rods, with the wire creating slots that enlarge inwardly, allowing proficient separation and a high rate of solids capture. 

A high rate of solids capture is integral to dewatering as it facilitates a faster separation process, providing companies with an efficient waste separation mechanism.  

The Contra-Shear Milliscreen pumps water waste into a weir tank before introducing it into a rotating drum face on an angle of 90 degrees. The screened waste then passes through Vee-Wire slots into another tank where it is pumped for further processing. 

Diverter plates then push captured solids towards the discharge end, which acts as a dewatering zone where solids agglomerate, resulting in a further reduction of liquid content. 

Phil says the force generated during this process is what makes the Contra-Shear Milliscreen so effective. 

“The force created by the pumping process separates solids and water at a faster rate than most trommel screens, making the product both time and cost-efficient.

“The structure of this particular screen drum also means its solid capture rate is more successful than conventional screens,” Phil says. 

He sees the Contra-Shear Milliscreen as an example of Johnson Screens commitment to high quality and adaptable dewatering solutions, highlighting the company’s innovative and durable design.

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