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Screenings and Grit Plant

This Wastewater Treatment Plant treats 57 ML/day of primary sewage from an EP of 210,000. The plant was expanded and commissioned in Dec 2005. The new SPIRAC® systems include three SPIROSEP Grit Vortex chambers, hydro cyclones, a SANDSEP® grit classifier, two twin SPIROWASH® screening washer units, a sluice and conveying system, and two SPIROTAINERs®.

Grit is pumped from the SPIROSEP® Vortex Grit chambers through three hydrocyclones and discharged into a single SANDSEP screening classifier. This feeds a common screenings/grit collection conveyor to fill two SPIROTAINERs®. Screenings from a band screen are transported via launder to twin SPIROWASH® screw-compactors which wash and compact the screenings before elevating the screenings into the collection conveyor. Automatic bifurcated chutes allow bypass to overflow bins if the SPIROTAINER® is full or absent. The system is completely automated, allowing auto bin changeover, duty/standby operation of the SPIROWASH®, and full monitoring and functional control.

This screenings and grit plant upgrade in 2006 included the following SPIRAC equipment:

  • SPIROSEP® Vortex grit systems (3) with Grit pump extraction
  • Launder (sluice) system to transfer screenings and wash water from screens to SPIROWASH units
  • SPIROWASH® Duplex (2) for high-capacity screenings washing and compaction
  • SANDSEP® Grit classifier fed by three hydro cyclones
  • Combined screenings and grit transfer conveyor
  • Diverter chutes on screenings and grit feed to the conveyor for emergency bypass
  • Two SPIROTAINERS® for storage, odour containment and road transport
Screening & Grit plant, Inlet works
Launder transportSPIROTAINER storage and transport container
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      Products

      SPIROWASH® Compact & High-Flow Screenings Washing Systems

      Screening washing, volume and weight reduction

      SPIROLINE® Horizontal/Inclined Shaftless Spiral/Screw Conveyors

      Intended for the transport of difficult, materials – suitable for a wide range of moisture contents and viscosities

      SPIROLIFT® Vertical Shaftless Spiral Conveying Technology

      Significant cost and operational advantage over alternate methods of sludge elevation and transport.

      SPIROSEP® Grit Vortex

      Separate high density grit particles

      SANDSEP®

      Grit Classifier

      SPIROTAINER®

      Auto-filling, containment and road transport

      OUR UPDATES

      Latest News & Articles

      Only 56% of Domestic Wastewater Is Safely Treated Worldwide
      Discover why investment in wastewater infrastructure is critical for protecting public health, preserving water resources and supporting a more sustainable future.
      READ MORE
      New Screen Installation Restores Reliable Screening Performance
      SPIRAC Australia recently completed the replacement of an aging step screen, providing the customer with a modern and reliable STEPGUARDTM screening solution designed to support long-term wastewater treatment operations.
      READ MORE
      SPIRAC Service Teams Deliver Conveyor Upgrades and Asset Life Extensions
      When solids handling equipment begins to show signs of wear, operators are often faced with a difficult decision: repair, replace, or continue operating at increased risk of unplanned downtime.
      READ MORE
      SPIRAC at Water New Zealand Conference & Expo 2026
      SPIRAC will be exhibiting at the Water New Zealand Conference & Expo 2026, taking place from 22-24 September 2026 at Claudelands, Hamilton, New Zealand.
      READ MORE
      SPIRAC is pleased to announce that it will be exhibiting at WEFTEC 2026 at Booth #6753
      SPIRAC is pleased to announce that we will be exhibiting at WEFTEC 2026, the world's largest annual water quality exhibition and conference, taking place in New Orleans, Louisiana, USA. Visit us at Booth #6753 to discover the latest innovations in solids handling, dewatering, screening, grit handling, and shaftless spiral conveying solutions.
      READ MORE
      Shaftless Spiral Slewing Conveyor Maximises Sludge Outloading Flexibility
      SPIRAC has manufactured a 12-metre shaftless spiral slewing conveyor designed to provide a flexible solution for sludge outloading. The design incorporates a single pivot point at the inlet, allowing the entire conveyor to slew across a wide operating arc and discharge sludge over a large area.
      READ MORE
      Our testimonials

      What They Are Saying

      SPIRACs engineers had an uncompromising commitment to develop and manufacture a leading inlet works solution within time and budget, allowing us to develop a sustainable plant for the future
      Mr. Davie
      Mr. DavieGoondiwindi, Aufsichtsrat /Entwicklungsberater
      Great system. We have it onsite at Rubyanna WWTP, recommend them for any plants for the future or even retrofitting! Flawless and easy! Also recommend SPIROTAINER. Less than 5 minutes from entering site with one and leaving with a full one! Great idea guys.
      Sean Watteau
      Sean WatteauDowner,
      Kläranlagen Treatment Plant Manager
      SPIRACs engineers had an uncompromising commitment to develop and manufacture a leading inlet works solution within time and budget, allowing us to develop a sustainable plant for the future
      Jacob Colins
      Jacob ColinsLystek Fairfield - Anlagenbetreiber /Produktkoordinator
      SPIRACs engineers had an uncompromising commitment to develop and manufacture a leading inlet works solution within time and budget, allowing us to develop a sustainable plant for the future
      Jacob Colins
      Jacob ColinsLystek Fairfield - Anlagenbetreiber /Produktkoordinator
      OUR FAQS

      Frequently Asked Questions

      Why Should You Buy From SPIRAC?

      SPIRAC is a trusted global leader in engineered wastewater solutions for materials handling, delivering reliable, purpose-built systems backed by decades of expertise. Customers choose SPIRAC for its ability to design and manufacture high-quality shaftless spiral conveyors, screenings handling systems, and bulk solids handling equipment that perform in the toughest industrial and wastewater environments. With a strong focus on innovation, durability, and low maintenance, SPIRAC solutions are engineered to reduce downtime, improve operational efficiency, and minimise lifecycle costs. Supported by a global footprint and dedicated local service, SPIRAC partners closely with clients to provide customised, end-to-end solutions that consistently deliver long-term value and performance.

      When you choose SPIRAC, you can expect a reliable partner committed to delivering high-performance, engineered solutions tailored to your specific needs. From the initial consultation through design, manufacturing, and installation, SPIRAC works closely with clients to ensure every system is fit-for-purpose and built to last. You can expect robust equipment designed for harsh operating conditions, minimal maintenance requirements, and long service life. SPIRAC also provides strong technical support, responsive service, and ongoing collaboration to optimise system performance, reduce operational costs, and ensure your materials handling processes run smoothly and efficiently.

      SPIRAC can confidently demonstrate a proven track record built on decades of global project delivery and industry expertise.

      With installations in municipal and industrial facilities across Australia, Europe, the Middle East, the UK, and North America, SPIRAC has successfully delivered thousands of materials handling systems operating in demanding environments such as wastewater treatment plants, pulp and paper mills, food processing facilities, and heavy industry. Its shaftless screw conveyor technology is widely recognised as a benchmark in the industry, with many long-term installations still operating efficiently after years of continuous service. In addition, SPIRAC supports its reputation with documented case studies, repeat clients, and ongoing partnerships with leading engineering firms and utilities—demonstrating consistent performance, reliability, and customer satisfaction across a wide range of applications.

      At SPIRAC, we understand that accurate cost visibility is critical to successful project planning. That’s why our team is ready to provide detailed, transparent quotations tailored to your specific requirements. Whether you’re upgrading existing infrastructure or planning a new installation, we work closely with you to scope your needs and deliver a clear, competitive proposal. With our engineering expertise and practical industry knowledge, you can move forward with confidence—knowing your solution is both technically sound and commercially aligned. Reach out today and let us help you plan with certainty.

      only
      56%
      of domestic wastewater is safely treated worldwide, and we aim to help improve this.
      read more →
      we serve clients in
      60+
      countries worldwide