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From Diablo Screening Washer to GRIND-RAX Compactor: an evolution in wastewater screening residue treatment

May 7, 2026

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For years, the equipment known as the Diablo Screening Washer has been an effective solution in wastewater treatment plants for handling residues collected from screening bars. Today, this system evolves under a new name: GRIND-RAX Compactor, while maintaining the same core operating principle and strengthening its positioning as an integrated solution for shredding, washing and compacting waste.


This change does not imply any modification to its performance or main function. Rather, it represents an evolution in the product range and in the way a technology already established in solids treatment is presented.

From Diablo Screening Washer to GRIND-RAX Compactor: an evolution in wastewater screening residue treatment | Kronoa Engineered Solutions

What is GRIND-RAX Compactor and what is it used for?

GRIND-RAX Compactor is a compact unit developed by Kronoa Engineered Solutions for treating solid waste retained on screening bars in wastewater treatment plants.

Its main purpose is to transform a bulky, wet residue with a high organic content into a cleaner, drier and easier-to-handle material. To achieve this, the unit integrates several key functions into a single system:

  • Shredding
  • Washing
  • Solid-liquid separation
  • Compaction and dewatering

 

Thanks to this integrated approach, waste can be treated directly on site, reducing transport costs, odour issues and the need for external disposal.

How GRIND-RAX Compactor works in a wastewater treatment plant

One of the main advantages of GRIND-RAX Compactor is that it does not operate as a standalone unit, but as part of the pre-treatment process. Its operation follows a continuous sequence of stages:

  1. Waste is fed into the hopper.
  2. A first washing stage removes part of the organic matter.
  3. The shredding system reduces the size of the solids.
  4. A second washing stage further cleans the material.
  5. The liquid fraction is separated from the solid fraction.
  6. The residue is compacted and dewatered before discharge

 

This dual washing process allows part of the organic matter to be returned to the treatment process instead of being sent to landfill, improving the overall efficiency of the plant.

Stages Grind-Rax Compactor | Kronoa Engineered Solutions

What problems does it solve on site?

In many wastewater treatment plants, screen residue management creates recurring operational challenges:

  • Excessive waste volume
  • High organic content
  • Odour generation
  • High transport and disposal costs


The GRIND-RAX Compactor addresses these issues directly. On the one hand, it can reduce waste volume by up to 90%, which has a direct impact on logistics and handling costs. On the other, it achieves dewatering levels of 45–55%, producing a drier and more manageable solid.

In addition, by removing a significant proportion of the organic matter, it helps substantially reduce odours and improves the cleanliness of the discharge.

Operational advantages of GRIND-RAX Compactor

Beyond its technical function, the value of GRIND-RAX Compactor lies in its direct impact on day-to-day plant operation.

As a compact system, it can be installed even where space is limited. It also allows continuous processing of generated waste, avoiding accumulation and reducing manual handling.

Another key benefit is that the equipment can be supplied on a rental or trial basis through Protech Rental Service by Protech Continental Group, making it easier to validate performance on site before committing to a full investment.

From Diablo Screening Washer to GRIND-RAX Compactor

The transition from Diablo Screening Washer to GRIND-RAX Compactor reflects an evolution in the way the equipment is named and positioned within wastewater residue treatment.

The former name referred to a machine type widely recognised in the sector, whereas the new brand places greater emphasis on its core function: shredding, washing and compacting waste in an integrated process.

In this sense, GRIND-RAX Compactor communicates more clearly what the equipment does and where it adds value. This is not simply a name change, but a clearer strategic positioning aligned with the current needs of treatment plants and with a more coherent identity within the Kronoa Engineered Solutions range.

From Diablo Screening Washer to GRIND-RAX Compactor | Kronoa Engineered Solutions

GRIND-RAX Compactor, formerly known as Diablo Screening Washer, is a well-established solution for handling screening waste in wastewater treatment plants. Its ability to integrate shredding, washing and compaction into a single unit makes it possible to reduce volume, remove organic matter and improve waste management on site.

In a context where operational efficiency and cost reduction are increasingly important, this type of solution plays a key role in pre-treatment.


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