Foodservice · Grease Trap · 8 min read

Grease trap foodservice: biological treatment that halves costs

Grease trap emptying costs foodservice operators between €4,000 and €12,000 per year — at legally mandated intervals under EN 1825 that cannot simply be talked away. What can be changed: the frequency. Operators using lipasanF® report intervals between mandatory emptyings up to 30–60% longer.

This article explains how biological grease trap treatment works in foodservice, what EN 1825 says about it — and what operators like Andy's canteen have documented over three years of practical experience.

Harald Mayer

Managing Director, Lipobak GmbH & Co KG · Grease trap expert since 2017

Grease traps in foodservice: the recurring cost problem

A foodservice operation with average kitchen output generates 2–5 kg of fat in wastewater daily. Of this, a well-maintained grease trap to EN 1825 mechanically separates up to 95% into the tank volume — the remainder enters the sewer as emulsified or dissolved fat. The separated fat in the tank liquefies, oxidises over time, forms solid layers and produces H₂S under anaerobic conditions.

The result: emptying intervals of 3–6 weeks are not unusual in high-volume operations (restaurant, staff canteen, industrial kitchen). At emptying costs of €300–900 per service, annual costs reach €4,000–12,000 — plus additional costs for odour complaints, fines for exceeding discharge limits and unplanned emergency emptying over public holidays and closure periods.

Many operators attempt to extend intervals with off-the-shelf degreaser products or "bio-tabs" — usually without measurable success. The reason: generic products contain no specialised microbial culture targeted at the specific substrates in a grease trap — saturated animal fats, frying oil residues, vegetable oils.

Why bleach blocks lipasanF® in commercial kitchens — and what works instead

The most common problem with biological grease trap treatments in foodservice is not the product — it is the cleaning schedule. Chlorine-based surface disinfectants (bleach, chlorine-based kitchen cleaners) are biocidal. That means they kill not only pathogenic organisms on work surfaces but also the microbial culture in the drain and grease trap. Dosing in the evening and cleaning with bleach in the morning neutralises the biological effect daily.

Andy, head chef at a 200-meal-per-day staff canteen, observed this over three years — and then switched: instead of bleach, he uses ammonia solution (NH₃, 9%) for fat surfaces and drains. Ammonia is at least an equivalent degreaser, has no biocidal effect on microbial cultures and costs approximately €6/litre. After the switch, the grease trap fill level fell measurably — the intervals between mandatory emptyings extended from the original 4 weeks to 8–10 weeks.

EN 1825 does not prescribe specific cleaning agents. It requires functional separators and compliance with discharge regulations. Biological treatment does not conflict with this — it supports compliance by permanently reducing fat input to the sewer and reducing the need for emergency emptying (which typically occurs outside agreed intervals).

lipasanF® in foodservice: food-safe, measurable, economical

lipasanF® is food-safe. The product contains exclusively non-pathogenic, approved microbial culture without genetic modification. We provide a full safety data sheet and a certificate of conformity. No food safety authority treats this as a concern — lipasanF® acts in the wastewater system, not in the food production area.

Dosing: every evening after the last rinse cycle and at least 30 minutes after the last chlorine-based cleaner — 1–2 pump doses of 100 ml directly into the drain leading to the grease trap. For larger separators (from 4 m³), we recommend a weekly maximum dose following consultation. Effect begins after 2–4 weeks; full efficiency after 6–8 weeks.

Economic calculation for a mid-sized operation (2 m³ separator, currently 10 emptyings/year at €500): current annual cost €5,000. Reduced to 5 emptyings with lipasanF®: €2,500 emptying costs + approx. €600 lipasanF® = €3,100 total. Annual saving: approx. €1,900 — in year one, and growing when bleach is replaced with ammonia solution.

Practical documentation from foodservice operations:

Staff canteen Andy — emptying interval extended from 4 to 8–10 weeks (3 years of documentation)
LINEG NRW — 40–60% fat reduction in sewer influent from foodservice cluster
Groß-Gerau — instrument-accompanied pilot phase with indirect foodservice dischargers
Amperverband Bavaria — extrapolation: 25 m³ fat biologically degraded in 12 weeks

Key takeaways for foodservice operators

Four points that simplify the decision:

1
Chlorine-based cleaners block lipasanF® — ammonia solution is equivalent for fat surfaces and does not destroy the biological effect.
2
lipasanF® is food-safe — full documentation available on request.
3
Operators report intervals up to 30–60% longer between mandatory emptyings — translating to ~€1,500–2,000 in savings for a mid-sized operation in year one. Results vary depending on fat load and cleaning schedule.
4
EN 1825 mandatory emptying remains legally required — biological treatment does not replace statutory emptyings but measurably reduces their necessary frequency.

Frequently asked questions on biological grease trap treatment in foodservice

Does lipasanF® work with every EN 1825 grease separator?

Yes. lipasanF® is compatible with all standard grease separators to EN 1825 — regardless of manufacturer, year of construction or nominal volume up to 10 m³. For larger systems or coalescence separators, we discuss dosing individually. The initial consultation is free.

Is lipasanF® food-safe and suitable for professional kitchens?

Yes. lipasanF® is food-safe. The product contains exclusively approved microbial culture without pathogenic organisms and without genetic modification. We provide a full safety data sheet and certificate of conformity.

Why have other biological products not worked for us?

Most generic products contain broad-spectrum bacterial blends not targeted at the specific fat substrates in a grease trap — saturated animal fats, frying oil residues, vegetable oils. Additionally, there is often the bleach problem: chlorine-based kitchen cleaners kill the added cultures daily. lipasanF® with an ammonia-based cleaning plan solves both problems.

Do mandated emptying intervals become void with lipasanF®?

No. Mandatory emptyings under EN 1825 and local discharge regulations remain legally required. lipasanF® can slow the rate at which the trap fills — operators report up to 30–60 % longer intervals between necessary emptyings with consistent dosing and no chlorine cleaning product interference. Results vary depending on fat load and dosing point.

How much does lipasanF® cost compared to an emptying?

A grease separator emptying costs €300–900 depending on region. At 8–12 emptyings per year that is quickly €4,000–10,000 p.a. lipasanF® costs a mid-sized operation approximately €50–100/month. If only 4 of the 10 emptyings are avoided, that saves €1,200–3,600 per year — with equal or better compliance.