Solutions › Biological pre-treatment (HLF)
Two-stage biogas · SLP high-load digesters
A single-stage biogas plant digests like a pig: maize yes, fibre hardly. Our two-stage system turns it into a cow. Two compact high-load digesters upstream of the main digester let your plant digest grass, straw, manure and other fibrous feedstocks — safely and profitably. Because biology decides whether a biogas plant works. Technology only makes it possible.
Our principle
An anaerobic digestion plant isn’t a chemical plant — it’s a living biological process. Treat it like a steel tank with pipework and you’ll pay for it later: foaming, acid crashes, too little gas. We think biology first and derive the technology from it. That’s exactly what makes your plant stable and profitable.
The principle in one picture
A single-stage biogas plant digests like a pig — maize yes, fibre hardly. With our upstream high-load digesters it gets a “rumen”: then it really digests practically anything.
🐷 + 🌽
Before — the pig
Digests mainly maize. Grass, straw and fibrous residues push it to its limits — with the risk of foaming, acid crashes and fluctuating gas yields.
🐄 + 🌾
After — the cow
Two compact high-load digesters work at very high temperatures at the molecular level. They support the natural microbiology — your plant digests fibrous feedstocks safely and with significantly more gas yield.
Schematic: two high-load digesters → main digester → post-digester/digestate storage → biogas
We don’t interfere with your existing biogas plant. The high-load digesters are simply installed upstream — your plant keeps running as before. Depending on size and capacity, you can then use your post-digester as digestate storage.
What you get
In the self-build model you build the two tanks yourself and save a lot of money. Design, permitting and commissioning come from us — from a single source.
01
We test your actual feedstocks and calculate what is possible with our high-load digesters.
02
We design the two upstream high-load digesters and guide you through the permitting process.
03
You build the tanks yourself and save money. We supply the concept, advise and support you — you supply the construction work.
04
We commission your high-load digesters and stay until everything runs stably at full load.
You build yourself and save — we take care of the biology and a safe start-up.
Why us
With our own high-load digester technology we get 35% more biogas from difficult, fibrous feedstocks than the German KTBL reference values. Over 30 years of experience, plants from 10 kW to 4 MW in 14 countries — and an approach that starts with microbiology, not with steel.
+35 %
more biogas than KTBL values thanks to HLF
30+
years of experience in design, construction & operation
14
countries on 4 continents
10 kW – 4 MW
plant sizes delivered
Planning a new plant?
Then we build the biology in from the start. From calculating your feedstocks through engineering and permitting to stable full load — a biogas plant that makes manure and straw even more profitable.
Honest pre-selection
We say openly what we are the right partner for — and what we are not. That saves you time.
you already have a biogas plant and want to use more “difficult” feedstocks.
your feedstocks are fibrous — grass, straw, straw-based manure and more.
you are willing to build the tanks yourself in the self-build model to save money.
you care about stable biology more than the cheapest standard solution.
your plant runs smoothly on maize and you don’t want to change anything.
you just want it cheap — and efficiency and quality don’t matter in the end.
you only want to hear that everything is possible. We tell you honestly what works and what doesn’t — even when it’s uncomfortable.
Next step
Send us what you want to use — grass, straw, manure, fibrous residues. We’ll come back with a first assessment of what our high-load digesters can get out of it for you.
Or directly: +49 8734 939770 · info@snow-leopard-projects.com
Practical knowledge, funding programmes and news from Snow Leopard Projects — compact by email.
