Proper disposal of used cooking oil from home cooking, such as after making tempura or tonkatsu, is essential for both environmental and sanitary reasons. In this article, we will explain in detail the appropriate methods for disposing of used cooking oil in Japan, providing safe and environmentally friendly procedures.

＊ During hot weather, like in summer, oil-soaked paper or cloth can generate heat and spontaneously combust if left unattended. Therefore, it’s crucial to dispose of them quickly along with burnable garbage.

1. Collection and Recycling of Used Cooking Oil

Some municipalities and supermarkets in Japan offer collection services for used cooking oil, treating it as a recyclable resource. You can simply pour the oil into a collection bottle or a plastic bottle and bring it to a designated collection point for recycling. It’s important to check the collection information in your area in advance and dispose of the oil properly.

2. Using Commercial Solidifying Agents like "Katameru Tempu"

Using a commercially available solidifying agent is the most common and convenient method. After cooking tempura or tonkatsu, you can add "Katameru Tempuru" to the oil, which will solidify it in a short time, making it easy to dispose of.

This method is particularly effective during the summer, as the solidification process is quicker. You can wrap the solidified oil in newspaper or old paper to prevent leakage and odors. Since odors can be stronger in hot weather, wrapping it twice may be effective.

There are also other agents like Abura Katametai, or Katamete Poi.

Once wrapped, place the solidified oil in a designated burnable garbage bag and dispose of it on the appropriate collection day. Be sure to follow the usage instructions and precautions when using oil solidifying agents.

3. Using Paper Cartons

Fill an empty milk carton with newspaper or used paper towels, and then pour the cooled oil into it. To prevent spontaneous combustion, also soak the paper with water. Seal the carton securely with adhesive tape and dispose of it with burnable garbage.

4. Using Plastic Bags

Once the oil has completely cooled, place newspaper or absorbent paper in a plastic or grocery bag, then pour the oil into it. To prevent spontaneous combustion, soak the paper with water. Seal the bag tightly with a rubber band and dispose of it with burnable garbage. Before pouring the oil, check for any holes in the bag, and consider double-bagging it to prevent leaks.

5. Natural Cooling and Solidification in the Refrigerator

If you don't have a solidifying agent, you can cool the oil naturally or solidify it by placing it in the refrigerator. After a few hours in the fridge, the oil will solidify, making it easier to dispose of. Since the cooling process takes time, it’s important to plan accordingly and not attempt to dispose of the oil immediately after cooking.

Additionally, wiping oil from dishes with paper or scraping off grease with a spatula before washing will make cleaning dishes easier.

Do NOT Pour Oil Down the Drain

Never pour used cooking oil down the drain. This can cause blockages in the sewer system, leading to environmental pollution and water contamination. When oil enters the sewer system, it can stick to the pipes, causing blockages. This increases the burden on sewage treatment facilities and can result in costly repairs. Moreover, blockages can lead to water leakage and unpleasant odors in your home.

Conclusion

Used cooking oil from tempura, tonkatsu, and other fried foods should be disposed of properly to avoid risks to the environment and hygiene. It’s recommended to cool and solidify the oil before disposing of it as burnable garbage, or to use recycling or collection services if you have a large amount of oil. Pouring oil down the drain is strictly prohibited, and proper disposal is necessary from an environmental protection standpoint. Use this guide to practice safe and environmentally friendly oil disposal.