Wet waste is one of the most challenging categories in commercial and industrial waste management. High moisture content, odor, contamination risk, and the sheer volume generated by food processing, agriculture, and municipal operations all create pressure on businesses to find smarter on-site solutions. The GPC P24 portable wet waste compactor from Gradeall International was built specifically to address these challenges.
In 2018, Gradeall manufactured and delivered a number of GPC P24 units to customers across the UK, each configured to meet the specific operational needs of the site. This article covers what the GPC P24 is, how it performs, the unique configurations delivered that year, and why purpose-built wet waste compaction is a practical investment for high-volume operations.
The GPC P24 is a portable waste compactor designed and manufactured by Gradeall International for processing wet and high-moisture waste streams. Unlike standard compactors built for dry mixed waste, the GPC P24 incorporates corrosion-resistant materials, liquid retention systems, and configurable loading options to handle demanding wet waste environments safely and effectively.
Its large hopper — measuring 2,314 x 1,778 x 1,905mm (W x L x H) — accommodates over 24 cubic yards of waste per load, making it well suited to high-volume operations where waste accumulates quickly.
The GPC P24 is built around a set of core engineering features that distinguish it from general-purpose compactors:
Compaction force: The unit delivers 50 tons of compaction force, achieving volume reductions of over 75%. For operations paying by the load for waste collection or transport, this reduction in volume directly lowers costs.
Automated operation: Programmable PLC-based controls manage compaction pressure, lift height, and eject cycles automatically. This means consistent, high-density output without requiring manual oversight during each cycle.
Corrosion resistance: The hopper is constructed from stainless steel with water-resistant seals throughout. In wet waste environments, where liquid infiltration and chemical exposure are constant, this construction significantly extends operational life compared to standard mild steel units.
Mobility: The GPC P24 is mounted on a hook-lift trailer base, allowing it to be relocated across a site or between sites as operational needs change. This makes it a practical option for businesses managing multiple waste collection points or seasonal volume fluctuations.
Handling wet waste with equipment not designed for it creates serious problems. Standard compactors can corrode rapidly when exposed to high-moisture food or agricultural waste. Sealing failures lead to liquid leakage onto yards and loading areas, creating hygiene and compliance risks. Inadequate compaction force results in poor volume reduction, keeping transport costs high.
The GPC P24 was engineered to solve each of these issues at the design stage rather than patching them after installation. Stainless steel construction and water-resistant lids prevent leakage; 50-ton compaction force delivers reliable volume reduction; and the automated controls reduce the need for constant operator intervention during processing.
Each GPC P24 unit Gradeall delivered in 2018 was tailored to the specific requirements of the customer’s site. The three configurations below illustrate how the base platform can be adapted for different loading methods, site layouts, and operational safety requirements.
Before each build, Gradeall produced detailed site layout renders using advanced design software, allowing customers to visualize exactly how the machine would integrate with their existing infrastructure and, in some cases, how it would look in their corporate color scheme.
The first customer required the ability to manually load the compactor from a raised loading platform. Their previous setup used open skips for food waste collection, which presented hygiene issues and made controlled loading difficult. The GPC P24 was configured to work directly with their elevated loading area.
This configuration included several purpose-built features to match the site requirements:
Hydraulically operated loading lid: The lid was fitted with a magnetic interlock system that prevented the compactor from operating while the lid was open. This safety feature ensures operators cannot accidentally run a compaction cycle during loading.
Second hook-lift point and roller wheels: Because the compactor needed to be positioned close to the raised loading area, the standard hook-lift point was not accessible for parking. A second hook-lift point was added, and roller wheels were fitted to allow the unit to be maneuvered on-site without crane assistance.
Raised loading handrail: A galvanized steel handrail was installed to prevent operators from falling into the compactor during manual loading. The handrail also incorporated a loading shelf and a remote operating panel housed in a lockable, vandal-proof enclosure.
Custom color scheme: At the customer’s request, the machine was painted in their corporate colors — an unusual but practical example of Gradeall’s willingness to accommodate site-specific and brand-specific requirements during the build process.
Before delivery, the machine underwent liquid retention testing, filled to a height of 425mm. No water escaped during testing, confirming that the sealing systems performed as specified before the unit left the Gradeall facility.
The second configuration was designed for a customer whose waste loading process relied on dolav bins moved by a rotating forklift mast. Standard top-loading compactors don’t accommodate this well, so the GPC P24 was adapted with a manually operated, gas-strut-assisted lid that opens fully to 90 degrees. This allows the forklift to position and tip the bins directly into the hopper without obstruction.
Beyond the loading lid, this unit included two additional features specific to wet waste processing:
Drainage ports: Two 2.5-inch drainage ports were installed in the container area of the compactor. Any liquid accumulating inside can be drained directly into wastewater treatment connections. Because the connection is secure, no contaminated water escapes onto the yard, keeping the surrounding area clean and meeting hygiene requirements for food-handling sites.
Lockable control panel cover: A vandal-proof lockable cover was fitted over the control panel to ensure the machine could only be operated by authorized personnel. In environments where multiple teams or contractors access the same loading area, this is a straightforward way to prevent unauthorized or accidental operation.
The third configuration combined the GPC P24 with a static bin lift system, creating a fully integrated waste collection and compaction setup. This type of installation is common where bins are collected from multiple points around a site and tipped directly into the compactor at a central location.
This unit’s configuration addressed both safety and operational flow:
Hydraulically operated feed lid with bin lift integration: The lid was configured to communicate with the bin lift so the lift mechanism knows the lid’s position at all times. The system prevents waste from being tipped into the compactor while the lid is open, and prevents the compactor from running a cycle while the lid is not properly closed.
Remote access panel: After loading a bin into the lift, the operator moves clear of the machine and uses a remote access panel to control the lift and compaction cycles. This removes the operator from the immediate loading zone during operation, addressing a key safety requirement for unsupervised or partially supervised sites.
Twin loading hooks and roller wheels: Like the first configuration, this unit was fitted with twin hook-lift points and roller wheels. The site also included a guide plate on the ground to ensure the compactor came to rest in the correct position to align with the static bin lift on each use.
The liquid retention testing performed on this unit, as with the others, confirmed that the sealing systems prevented any leakage before the machine was approved for delivery.
The GPC P24 is used across a range of sectors where wet or high-moisture waste is generated at scale. Its combination of portability, high compaction force, and corrosion-resistant construction makes it applicable wherever large volumes of organic or liquid-laden waste need to be processed on-site before collection.
Food production facilities generate continuous wet waste streams: off-spec product, packaging contaminated with food residue, wash-down waste, and organic trimmings. The GPC P24’s stainless steel construction and drainage port options handle these streams without the corrosion and contamination issues that affect standard steel units.
Volume reduction of over 75% is particularly significant for food manufacturers paying for waste collection by the load, where reducing the number of collections needed translates directly into lower annual costs.
Agricultural waste — including silage, manure, processing byproducts, and packaging from chemical treatments — is often both bulky and high in moisture. Portable compactors are well suited to agricultural sites where waste is generated at different points across large properties, and the GPC P24’s hook-lift base allows it to be repositioned as operations move through the season.
Local councils, large hospitality venues, and event operators managing food waste and general municipal waste streams benefit from the GPC P24’s automated cycle management and high-capacity hopper. Automated height and pressure adjustment means consistent output without requiring a dedicated operator for each cycle.
High-moisture biosolid waste from healthcare environments requires compactors that can handle the liquid content without contamination risk. The GPC P24’s liquid retention testing protocols and sealed construction make it appropriate for these applications, provided appropriate waste classification and disposal arrangements are in place.
The GPC P24’s commercial case rests on a small number of measurable outcomes that apply across most wet waste operations.
Volume reduction is the most direct benefit: compressing waste by over 75% reduces the physical space waste occupies on-site and cuts the number of collection or disposal trips required. For operations paying per collection or per ton for disposal, this has a direct impact on operating costs.
Automated cycle management reduces the need for continuous operator supervision. Once the PLC-based controls are set for the waste type and compaction requirements, the machine manages its own cycle, freeing operators for other tasks. This is especially relevant for food processing and agricultural sites where labor is focused on production rather than waste handling.
Corrosion resistance extends the operational life of the equipment in environments that would degrade standard steel units within a few years. Stainless steel construction and water-resistant seals are not optional features for wet waste applications; they’re baseline requirements for sustainable performance.
Portability adds operational flexibility. The ability to reposition the compactor using a hook-lift vehicle means a single unit can serve multiple loading points, reducing the capital investment required to cover a large or multi-zone site.
One of the consistent themes across the three 2018 configurations is the degree of customization available within the GPC P24 platform. Safety interlocks, loading lid configurations, drainage systems, handrail and access infrastructure, remote control panels, and even color schemes were all adapted to match specific customer requirements.
Gradeall’s design and manufacturing process supports this level of customization because all engineering, assembly, and testing takes place at the Dungannon, Northern Ireland facility. Before any build, the team produces rendered site layout drawings so customers can verify how the machine will integrate with their existing infrastructure. After assembly, every unit undergoes liquid retention testing to confirm sealing performance before leaving the facility.
This approach differs from sourcing compactors through distributors or resellers, where customization is typically limited to what the manufacturer will accommodate through a third party. Direct manufacturing enables bespoke configurations at the build stage rather than requiring aftermarket modifications.
Not all portable compactors are suited to wet waste. Standard units are generally built for dry mixed waste — cardboard, plastics, general commercial waste — and their construction reflects that. Mild steel bodies, standard sealing, and single-hook lift systems are adequate for dry streams but fail quickly when exposed to the conditions wet waste creates.
The GPC P24 differs in several ways that matter specifically for wet waste applications. Stainless steel construction resists the accelerated corrosion caused by food acids, agricultural chemicals, and biosolid moisture. Liquid retention sealing prevents contaminated leachate from escaping onto the yard. Drainage ports give operators a controlled way to manage accumulated liquid. Automated compaction management handles the variable density of wet waste more effectively than manual cycles.
For operations that process both wet and dry waste streams, the decision between a standard compactor and a wet-waste-specific unit depends on the volume and frequency of wet waste generated. Where wet waste makes up a significant portion of overall volume, the cost of corrosion damage and contamination incidents from an inadequate unit will outweigh any initial cost saving within a relatively short time.
Understanding how the GPC P24 fits into a specific operation often comes down to a few practical questions. The answers below cover the most common queries from facilities evaluating wet waste compaction equipment.
The GPC P24 is designed for food, agricultural, biosolid, and other high-moisture municipal waste, including streams with up to 75% water content. Its stainless steel construction and liquid retention systems make it appropriate for waste types that would damage or contaminate standard compactor units.
Using 50 tons of compaction force, the GPC P24 consistently reduces waste volumes by over 75%. The actual reduction achieved will vary depending on waste type and moisture content, but this figure is representative across typical food and agricultural waste streams.
The GPC P24 uses a PLC-based control system to manage compaction pressure, lift height, and eject cycles. Once configured for the waste type and site requirements, the system runs cycles automatically without continuous manual input. This reduces operator workload and ensures consistent compaction density across loads.
Stainless steel construction significantly reduces corrosion-related maintenance compared to mild steel units. Gradeall provides full maintenance support, including planned servicing, spare parts supply, and technical support for the control systems. Drainage ports and seals should be inspected regularly as part of routine maintenance, particularly in high-throughput applications.
Standard safety features include water-resistant lid seals, emergency stop circuits, and stability systems. Depending on configuration, additional safety features such as magnetic lid interlocks, remote operating panels, and bin lift integration with lid position sensing can be added at the build stage.
Yes. As the three 2018 configurations demonstrate, the GPC P24 can be adapted for manual loading from raised platforms, forklift-based loading via rotating masts, and bin lift integration. Handrails, drainage ports, remote panels, custom color schemes, and additional hook-lift points are all available as part of the standard customization process.
The GPC P24 is mounted on a hook-lift trailer base and is primarily designed for outdoor or covered outdoor installation. Site layout requirements, including access for hook-lift vehicles and proximity to wastewater drainage connections, should be assessed before installation planning begins.
Every GPC P24 unit undergoes liquid retention testing at the Gradeall facility before dispatch. This involves filling the unit to a specified height and confirming that no liquid escapes through the seals or joins. Units that do not pass this test are not approved for delivery.
Gradeall International has been manufacturing waste management and recycling equipment from its facility in Dungannon, Northern Ireland for nearly 40 years. All design, engineering, assembly, and testing takes place in-house, which supports the level of customization that wet waste applications typically require.
For businesses evaluating the GPC P24 or other portable compactor options, the starting point is an assessment of the waste streams involved, the volume generated, the site layout, and any specific loading or safety requirements. Gradeall’s team can provide site layout renders, specification guidance, and details on support arrangements including installation, operator training, and ongoing maintenance.
To discuss GPC P24 specifications or explore which configuration would suit your operation, contact the Gradeall team at +44 (0)28 8774 0484 or [email protected].
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