Disposing of kitchen waste and used cooking oil properly

Segregate at the point of waste

Segregation only works if it happens where the waste is made. Put separate, colour coded bins at each station for wet food waste, for dry recyclables such as cartons and cans and for general rejects. Most city rules now expect wet and dry waste to be handed over separately. Rules vary by city and change, so check what your municipal body expects from a commercial kitchen.

Brewpubs often fall into the category of bulk waste generators. That can mean you are expected to process wet waste on site or pay an authorised agency to collect it. Our guide to composting brewery and kitchen waste on site covers the on site option.

Spent grain is not kitchen waste

Spent grain comes out of the mash tun at around 80% moisture and in volume. A 1,000 litre batch can leave a couple of hundred kilograms of wet grain. It starts to sour within a day in warm weather. Keep it out of the kitchen bins entirely and send it to a farmer or feed buyer the same day. Our guide to brewery waste and spent grain covers the options.

Grease traps protect the drains

Fats, oils and grease from washing up cool in the drain and set hard. Over a few months they narrow the pipe until the kitchen floods on a busy night. A grease trap between the sinks and the main drain catches them first.

Size the trap for the kitchen, then clean it on a schedule. Weekly is common for a busy kitchen, but the right interval is whatever keeps the grease layer from reaching the outlet. Scrape plates into the food waste bin before they reach the sink. Never pour fryer oil or hot fat down a drain. Log every cleaning with the date and who did it.

Keep the bin area from becoming a pest site

The bin store is where kitchen waste waits for collection, often for most of a hot day. Give it a hard floor that slopes to a drain, a tap for washing down and a door or lid that closes. Wash the bins themselves at least weekly. A bin with a crust of old food at the bottom smells and draws flies even when it is empty.

Agree a collection time with your waste agency that suits the kitchen, ideally before the evening rush rather than after it. Wet waste left overnight in summer is a smell problem by morning and an invitation to rats by the next night. If collections are missed, log them and raise it with the agency in writing.

Used cooking oil has rules of its own

Repeatedly heated frying oil breaks down. It darkens, foams, smokes at lower temperatures and builds up polar compounds. FSSAI sets a limit of 25% total polar compounds (TPC) for oil in use. Once oil crosses that, it should not be used for frying food again.

A handheld TPC meter takes a reading from hot oil in seconds. Test the fryer at a set point in each shift and record the reading. That log does two jobs: it tells the kitchen when to change oil and it shows an inspector you are watching it. It also stops the quiet habit of topping up old oil for another week to save money.

Hand oil only to an authorised collector

Used cooking oil has a resale value, which is exactly the problem. Some buyers clean it up and sell it back into the food chain. FSSAI runs the Repurpose Used Cooking Oil (RUCO) initiative to steer used oil towards biodiesel and other non food uses through registered collection agencies.

Store used oil in sealed, labelled containers away from the fryer. Hand it to a registered collector and keep the receipt with the quantity. Check the current FSSAI guidance for any record keeping your size of kitchen needs.

Train the team with a one page waste map

Rules in a folder do not move waste. Draw a one page map of the site with every bin, the grease trap, the oil storage point and the collection area, plus which waste goes where. Stick it up in the kitchen and in the brewhouse. Walk every new hire through it in their first week, the same way you would show them the fire exits.

Give one person on each shift ownership of the waste routine: bins out, oil logged, trap checked. Shared jobs tend to become nobody's job by the third busy weekend.

Put it in the monthly numbers

Waste is a cost line and a quality signal. Track kilograms of food waste a week, litres of oil bought and litres collected. If oil bought rises while covers stay flat, the fryer is being changed too often or something is leaking. If food waste per cover climbs, portions or prep forecasts are off.

Small numbers like these, reviewed every month, are what turn a busy kitchen into a well run one. Building that monthly review is part of what a brewpub owner has to learn alongside the beer.

Common questions

What is the FSSAI limit for used cooking oil?

FSSAI sets a limit of 25% total polar compounds for frying oil. Oil above that should be discarded and handed to an authorised collector.

Can we pour used fryer oil down the drain?

No. It sets hard in pipes and blocks drains. Store it in sealed containers and give it to a registered collection agency.

How often should a kitchen grease trap be cleaned?

Weekly is common for busy kitchens. The right interval is whatever keeps grease from reaching the trap outlet, so check and log it.

Should spent grain go in the kitchen food waste bin?

No. Spent grain is wet, heavy and sours fast. Keep it separate and send it to a farmer or feed buyer the same day.