What is a grease trap and why is it mandatory in a professional kitchen?

A grease trap is a key piece of equipment for every professional kitchen, protecting the sewer system and at the same time helping to protect the environment. It captures grease and solid waste from the wastewater before it reaches the sewer. The build-up of grease in internal pipework leads to frequent blockages, costly repairs and even work stoppages, which makes the grease trap not just recommended but essential for every kitchen, whether it is a restaurant, a workshop or a catering site.

What is a grease trap?

A grease trap, also known as a grease interceptor, is a tank through which the wastewater from sinks, dishwashers and other kitchen appliances passes. In this tank, thanks to the lower density of grease compared with water, the grease separates and is retained on the surface, while solid particles settle at the bottom. The treated water is discharged through an outlet pipe, while the grease and solid particles remain in the unit and are removed periodically.

Why is it mandatory in a professional kitchen?

Legal requirements

In Bulgaria and the European Union there are regulations that oblige the owners of sites with a high grease content in their wastewater to install grease traps. This applies to restaurants, bakeries, butchers' workshops, canteens, bars and other establishments. Penalties for non-compliance include fines, orders to cease operations and/or the withdrawal of licences.

Protection of pipes and equipment

Grease tends to build up on the inner walls of sewer pipes, where it hardens and causes blockages. This causes breakdowns, work stoppages and the need for emergency repairs. In addition, grease damages the equipment in modern treatment plants and increases the costs of water and sewerage operators.

Protection of the environment

In the case of direct discharge (pouring), grease and oils can reach water bodies and cause serious damage to ecosystems. The grease trap retains these pollutants and prevents them from entering the environment.

Reducing operating costs

Regular use and servicing of the grease trap protects against costly repairs, pipe replacement and fines. In addition, with good management, the collected grease can be reused.

How does a grease trap work?

The working principle is based on the physical properties of grease, which has a lower density and does not mix with water. When wastewater enters the unit, it slows down and a process of natural separation begins:

1. Grease rises and is retained in the upper part.
2. Solid particles settle in the lower zone.
3. Treated water flows out through an outlet pipe.

Over time, the accumulated grease and sludge must be removed by cleaning. Failure to follow these procedures leads to backflow and damage.

Types of grease traps

Under-sink grease traps

These are the most common solutions for small and medium-sized kitchens. They are made of polypropylene or polyethylene (a type of plastic) and are installed under a sink in the kitchen. They must be cleaned manually every day. They offer a low initial investment and flexibility of installation, but require regular human effort.

Automatic grease traps

These units include an automated system for removing the grease, which is collected in a separate container. They are set to operate on a schedule and reduce the need for manual intervention. Although they have a very high price, they provide better hygiene and lower operating costs in the long term.

Grease traps with aeration

Suitable for large sites with intensive loads, for example slaughterhouses, dairies, pastry workshops and the like. They are made of plastic, concrete or composite materials. They are installed buried in the ground and require servicing by licensed companies every 4 to 8 months.

Maintenance and cleaning

How often cleaning is needed depends on the load on the unit, the type of site and the volume of wastewater.

In addition, biological solutions with bacteria and enzymes (applied according to a schedule) can be used, which break down the grease and lengthen the time between cleanings.

Common mistakes in use

1. Neglecting maintenance, which leads to blockages;
2. Installing a unit that is too small, which cannot handle the real flow rate;
3. Throwing solid waste into the sink, which increases clogging;
4. Lack of trained staff, which leads to improper operation.

Conclusion

A grease trap is a mandatory investment for every professional kitchen, not only because of regulatory requirements but also for the sustainable operation of the site. The choice between an under-sink grease trap and an underground grease trap depends on the type and load of the site. Regular maintenance is the key to long-lasting, trouble-free operation of the unit.

ERMAX BG offers professional consultation and installation of grease traps throughout Bulgaria. Contact us for an individual quotation and guarantee the reliability of your kitchen or business today.