What Are the Advantages of Automatic Grease Traps？

What Is an Automatic Grease Removal Device? A Grease Guardian Automatic Grease Removal Device also known as an AGRD features advanced mechanical skimming and heating technology to streamline grease removal. The device heats to liquefy the grease, which is then skimmed by an oleophilic wheel that collects the harvested grease in an external container. The system only requires 2-3 pump outs per year and 2 minutes of maintenance daily. With less than 1% impurities, the harvested grease can be stored with spent fryer oil and is suitable for biofuel production.

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In the food service industry, managing fats, oils, and grease (FOG) is essential for maintaining a clean and efficient kitchen. While traditional/passive grease traps have been the go-to solution for years, automatic grease removal devices (AGRDs) are quickly gaining popularity for their superior performance and convenience.

Here are the top five reasons to consider making the switch to Automatic Grease Removal Devices:

1. Reduced Maintenance Costs

With a significantly lower frequency of required pump-outs (typically only two to three times per year) AGRDs reduce maintenance costs by 80% compared to traditional grease traps that often require monthly or bi-monthly service. Fewer pump-outs mean less time spent on maintenance and lower sludge removal/pump out fees, saving your business money in the long run.

2. Highly Efficient Grease Removal

AGRDs are designed to continuously separate grease from wastewater, providing real-time management of FOG. Unlike passive grease traps, which require manual pumping and maintenance, AGRDs operate automatically, ensuring that your system functions optimally without constant supervision.

By removing the grease from wastewater, odours are significantly reduced contributing to a more pleasant kitchen environment. This streamlined process not only enhances operational efficiency but also minimizes the risk of clogs and costly plumbing issues. Ultimately, this efficiency translates into less downtime, smoother kitchen operations, and enhanced overall productivity.

3. Environmental Benefits

Switching to an AGRD contributes to better environmental practices. By preventing grease from entering the sewer system, you help reduce the risk of fatbergs and other plumbing issues that can harm the environment.

Additionally, AGRDs harvest grease, transforming a waste product into a renewable resource. Therefore, in this raw state it can be repurposed into biofuel. The extracted grease can be collected alongside spent fryer oil; and if there is enough of it, it allows the food service establishment to gain a profit, thereby supporting renewable energy initiatives and the circular economy.

4. Enhanced Odour Control

AGRDs effectively skim grease from wastewater, significantly reducing the amount of stagnant fats, oils, and grease (FOG) in the main tank. By minimizing FOG build-up, AGRDs help maintain a cleaner and fresher kitchen environment, which is essential for both staff and customers. This reduction in odours enhances the overall dining experience and can lead to increased customer satisfaction.

5. Regulatory Compliance

Many municipalities have stringent regulations regarding grease management. Grease Guardian Automatic Grease Removal Devices exceed these regulations, helping businesses stay compliant and avoid potential fines. By investing in an AGRD, you demonstrate a commitment to environmental responsibility and adherence to local codes, which can enhance your business’s reputation.

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Grease traps are one of the most popular FOG (fats, oils and grease) management solutions, with passive (manual) and automatic traps being the most popular options for commercial kitchen operators looking to prevent grease related issues.

They both do essentially the same job of separating FOG from wastewater though at a glance, automatic grease traps seem very expensive compared to manual grease traps, there are more factors to consider than just the initial cost of the unit.

This article will compare the two system types, explaining the main differences and the pros and cons of each system so you can make an informed buying decision and select the right system for your requirements.

Firstly, lets cover what each system does so you can understand what to expect from each type of unit.

Passive (manual) grease traps

Traditional passive grease traps simply slow the flow of wastewater to allow it to cool and separate into 3 layers; FOG, solids and clear water. The FOG forms a “grease mat” at the top of the unit and solids either accumulate at the bottom of the unit or collect inside a strainer which is located just after the inlet. The clear water escapes via the outlet.

Automatic grease traps

Automatic systems, also known as AGRU’s (automatic grease removal units), perform many of the same operations as a manual grease trap. Much like a manual system the flow of wastewater is slowed to allow it to cool and separate though automatic systems almost always feature the addition of a removable strainer basket for solids collection. This means the wastewater inside the unit will mainly contain FOG with only small amounts of solid waste escaping the strainer and settling at the bottom of the unit.

The similarities between the automatic and passive models stop once the FOG separates and rises to the top inside the unit. Rather than letting the FOG form a “grease mat”, automatic system re-heat and skim out the FOG automatically on a programmed schedule. The skimmed FOG is then transferred into a collector bin for easy removal and recycling.

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So now you know what each system does, lets delve into some comparison between the 2 systems, which may help with your buying decision. The 4 main area’s covered are:

• Efficiency & Performance
• Sustainability
• Cost

Efficiency

There is a direct correlation between how efficient a grease trap is and the amount of grease inside the system. The more kilograms of grease inside the unit, the less efficient the trap becomes, which impacts overall performance.

For this reason, manual grease traps are less efficient than automatic ones as the grease accumulates inside them until its either pumped out or emptied manually. As automatic traps skim and remove FOG on a scheduled basis, grease doesn’t build-up inside the unit meaning the system will maintain maximum efficiency and perform at a consistent level.

The graphs below give a visual representation of performance vs kilograms of grease based on 25kg traps connected to equipment producing 2.5kg of grease per day:

As you can see the overall performance of the manual trap drops quickly once the amount of grease gets to a certain level, while the automatic trap maintains consistent performance.

Sustainability

Both systems are kind to the environment as they help prevent FOG entering the sewerage system but what happens to the recovered and pumped out waste?

With manual traps, the grease management service company who pump out the trap will dispose of all substances removed from the trap. The grease will often be recycled into biodiesel and any solids will be disposed of in the correct manner, helping to keep our environment clean.

Automatic traps remove grease and deposit it into a container in liquid form. This can then be collected along with other used cooking and waste oil by your relevant service provider. Potentially, if enough is produced, the removed grease from automatic traps can be sold as an additional revenue stream.

So, while both systems are eco-friendly, automatic traps edge ahead due to the potential of adding an extra source of income via selling removed grease.

Cost

Purchase price is usually the deciding factor between choosing a manual or automatic grease trap, however there are other costs which need to be considered when buying any type of grease trap. All the costs to consider are:

• Purchase Costs
• Daily Maintenance Costs
• Running Costs
• Pump Out Costs

The purchase cost of an automatic grease trap can be 5 times more than the purchase cost of its manual equivalent. Manual traps also have no moving parts meaning they need no daily maintenance and require no electricity to run, unlike automatic traps which need around 10 minutes of maintenance a day and require an electricity supply to function.

It looks like manual traps come out on top but the final consideration of pump out costs swing the comparison in the favour of automatic grease traps. Manual traps require pumping out every 2-4 weeks at a cost of between £150 and £200, whereas automatic traps only require pumping out every 3-6 months at the same cost. While you can increase the time between pump outs of manual traps to up to 8 weeks by adding a biological grease treatment fluid into the system or “dosing”, this adds to the purchase / install costs and to running costs. So, over the course of 3 years, automatic traps will be much cheaper overall.

Let’s compare 2 similar automatic and manual Grease Guardian grease traps, the GGX15 (automatic) and GT1 (manual), so you can see which one will cost you less over a 3-year period.

The figures below are based on the following:

• Daily maintenance costs = 10 minutes of labour @ £10 per hour
• Running costs = £0.16 per day
• Pump out costs = £175
• Pump out intervals for GGX15 Automatic Grease Trap = Every 3 months
• Pump out intervals for GT1 Manual Grease Trap = Every 3 weeks
• Costs increase of 2% per annum

Year 1

GGX15 Automatic Grease TrapGT1 Manual Grease TrapTOTAL£4,150.73£3,525Purchase Cost£2,784£550Daily Maintenance Costs£608.33£0Running Costs£58.40£0Pump Out Costs£700£2,975

Year 2

GGX15 Automatic Grease TrapGT1 Manual Grease TrapTOTAL£1,394.07£3,034.50Daily Maintenance Costs£620.50£0Running Costs£59.57£0Pump Out Costs£714£3,034.50

Year 3

GGX15 Automatic Grease TrapGT1 Manual Grease TrapTOTAL£1,421.95£3,095.19Daily Maintenance Costs£632.91£0Running Costs£60.76£0Pump Out Costs£728.28£3,095.19

Cost Over 3 Years

GGX15 Automatic Grease TrapGT1 Manual Grease TrapCost Difference£2,687.94Total Cost Over 3 Years£6,966.75£9,654.69

Evidently, in the first year the GGX15 automatic unit works out more expensive than the manual GT1, mainly due to the high purchase price. However, by the end of year 2, the much higher pump out costs of the manual unit mean the overall cost is higher its automatic counterpart. After 3 years, the cost difference between the 2 units is nearly £3,000 in favour of the automatic GGX15. If you also add potential income from selling recovered oil from the automatic unit, the cost difference increases even more.

Although automatic grease traps require a higher initial investment, the additional features gained by the extra investment offer increased performance, potential for additional revenue and reduced long term costs, making automatic grease removal units the best choice for grease management.

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