Blog

Making the food chain circular together: this is how Lokalist and rotterzwam do it

Rotterzwam and Lokalist join forces for a sustainable food service What do you do with all that coffee grounds left over after brewing a cup of coffee? Most companies simply throw them away, bu...

Six Months With Mushrooms: Neja's internship experience

"During my internship at rotterzwam I learned all about making substrate for mushrooms and the best circumstances in which they grow. I especially liked all the research we did with Lion's Mane, be...

The future of rot and fungus - information session

Discover Rotterzwam's future plans – sign up for the online information sessions! Rotterzwam is organizing four interactive online information sessions on May 20th & 28th and June 10th &...

The impact of rot fungus in 2024

In 2024, we collected slightly less coffee grounds than in previous years. We paid less attention to finding more partners to collect coffee grounds, as we are not yet able to utilize the high-qua...

Scaling up to The Hague

Over the past few years, we've been able to share our knowledge with many entrepreneurs (for a fee). This has also led to the creation of several businesses. However, quite a few have already close...

Sporo - From urban waste stream to mushroom

Making substrate from coffee grounds, among other things, isn't easy. That's the conclusion we can safely draw after the past 12 years. Sterilizing this residual flow is essential, especially if...

the impact of rot fungus in 2023

During 2023 we were able to collect a record amount of coffee grounds. Unfortunately, we can only use a relatively small portion of the coffee grounds from our mushroom cultivation. Some of it i...

Step 4 The first results are positive - Lion's mane on coffee grounds

Coffee grounds naturally contain many spores of microorganisms. As soon as the coffee grounds remain in the machine, a race of organisms begins to colonize this medium. You'll barely see any signs ...

Step 3 Research Circular Mushroom Substrate Facility

We have put our incubation space into use. We converted a 40ft reefer container into an incubation space. We divided this container into three areas. Entrance: small space to change clothes ...

Step 2 Research Circular Mushroom Substrate Facility

We have already conducted initial tests on pasteurizing and sterilizing coffee grounds on a small scale. We're using a steam tank (see photo), a drying oven, and pressure cookers to conduct i...

Step 1 Research into a Circular Mushroom Substrate Facility

Approximately 200,000 tons of coffee grounds are produced annually. About 30% ends up in offices or the hospitality industry. These 60,000 tons are usually disposed of as residual waste and inciner...

The impact of rot fungus in 2022

In 2022, we're seeing a significant increase in the amount of coffee grounds again. Our business clients are increasingly back in the office. Fortunately, we've been able to use more and more cof...

MLN 6th - Fungi symbiosis 2022 event September 17 and 18, 2022 - Belgrade - Ekofungi

In the past 2 years, the world has changed in many ways. More and more people have come to see that we need to change. The mushroom community knew this already for several years. Mushrooms can p...

Pita bread with oyster mushroom shawarma

✔ vegetarian ✔ for 2 persons ✔ easy ✔ 20 minutes When you ask the Rotterzwam team what their favorite mushroom dish is, they'll all say in unison: shawarma! This easy dis...

Don't throw away your coffee grounds!

If you've known us for a while, it probably won't surprise you that you can grow oyster mushrooms on coffee grounds. Since 2013, we've been processing local coffee grounds at our Rotterdam farm. O...