What is Arciplug®
PLUG FLOW Digestion – and Why It Changes Everything?
Arciplug®’s patented PLUG FLOW (PFR) reactor converts organic waste like agricultural residue, energy grass, industrial waste and municipal waste into clean energy without additional water.
What is PLUG FLOW?
In classical engineering, plug flow describes how fluids move through a pipe: the entire cross-section advances forward at nearly the same velocity, like a solid “plug,” typically driven by pressure, pumps, or gravity. This principle is widely used in chemical engineering and wastewater treatment, ensuring predictable residence time, efficient conversion, and stable process conditions.
When applied to anaerobic digestion, the same principle creates a stable, predictable pathway for organic waste to be converted into biogas and fertilizer. Arciplug®’s patented PLUG FLOW digesters build directly on this foundation — optimized for high-solids feedstocks, multi-feed input, and reliable biogas production.
What is Arciplug® PLUG FLOW Digestion?
Arciplug®’s patented design applies PLUG FLOW principles to full-scale biogas plants. Depending on the feedstock, a feed screw or pump serves as the “mouth” of the system, feeding material into the digester and generating the pressure that pushes the mass forward horizontally like a slow-moving plug. Controlled vertical mixing keeps the biology even and stable, while a small recirculation stream (<2%) supports long-term process stability. The dominant flow remains strictly plug flow – a concept we define as axial plug stability.
In PLUG FLOW anaerobic digestion, organic material flows forward in a steady, unmixed path. This enables natural microbial zoning: hydrolytic bacteria dominate the front, acidogenic and acetogenic microbes follow, and methanogens thrive in the final section – safely shielded from incoming raw feedstock.
This structure mirrors ecological succession in nature and ensures high methane yield, biological stability, and efficient processing of high-solids or multi-feedstock inputs.
Let’s plan the next-generation biogas project together.
High-Efficiency Biogas Plants Powered by PLUG FLOW Technology
Arciplug®’s patented PLUG FLOW digesters convert organic and municipal waste into clean energy — without added water. Scalable, reliable, and proven, they are designed for challenging feedstocks and demanding environments.
Our innovative technology maximizes biogas and biomethane production while keeping CAPEX and OPEX competitive. By enabling high load digestion, multi feedstock flexibility, and stable operation, Arciplug® sets a new benchmark for biogas efficiency.
Whether you are developing a new facility or upgrading an existing one, Arciplug® solutions help you generate more energy, reduce costs, and upcycle organic waste into valuable fertilizer.power production.
Let’s plan the next-generation biogas project together.
Key Benefits of Arciplug®’s Patented PLUG FLOW System
Compact, modular, and scalable – from farm-scale to industrial projects.
- Handles feedstocks with up to 40% solids – no dilution required
- Secures stable and resilient microbial activity
- Maximizes methane yield with faster ramp-up times
- Cuts operating costs (no added water, lower energy use, simplified maintenance)
- Compact, modular, and scalable – from farm-scale to industrial projects
Ready to take the next step?
Share your project basics – location, feedstock and capacity.
Together we’ll find the best solution and prepare a tailored quote.
Feedstock Flexibility – One System, Many Inputs
Arciplug®’s PLUG FLOW system is a true Multi Feed Digester, engineered to process diverse and challenging biomass streams without added water or process instability.
We also operate a dedicated pilot plant where new and complex feedstocks are tested and validated, ensuring reliable performance before full-scale deployment.
All biodegradable feedstocks above 15% total solids (TS/DM) can be fed directly. No dilution, no pre-treatment, no compromise.
The system is purpose-built for the kinds of inputs that conventional digesters struggle with: fibrous, high-solids, and lignin-rich feedstocks that require long retention and biological stability.
Let’s turn waste into resource!
We can handle the widest range of feedstocks:
Fibrous crop residues
Straws, stalks, and lignin-rich agricultural by-products (for example paddy straw, wheat straw, corn stover) that benefit from long retention and controlled microbial staging.
Municipal organic waste
Even with variable composition, organic fractions and percolate streams can be stabilized and digested without pH shocks or overloading.
Energy crops
Fast-growing, high-TS biomass such as Napier grass ensures continuous feedstock availability and consistent output.
Dry industrial organics
Press mud, bagasse, sugar beet pulp, decanter solids. These are ideal for dry digestion with high gas yields.
Manure and slurry-like inputs industrial organics
Moist materials such as cow dung, poultry manure, or camel waste provide natural moisture and microbial buffers for co-digestion.
Marine and seafood residues
Fish waste and similar high-energy substrates can be processed safely when combined with fibrous inputs.
We enable what others avoid. Upcycling the Toughest Waste → Value
High organic loading rate (OLR) – More Gas in Less Space
Arciplug® digesters are High Load Reactors by design. With dry digestion and no dilution, they can reach OLRs up to 11 kg VS/m³, which is about 3 to 5 times higher than conventional CSTRs, while still maintaining biological stability.
This means the same amount of organic waste can be processed in a much smaller reactor, without sacrificing gas output. By maximizing throughput in a compact footprint, Arciplug® enables efficient and space-saving biogas production, even in land-constrained industrial or urban sites.
Why higher OLR matters:
• More organics per m³ → higher methane yield and more energy output
• No back-mixing → longer hydraulic retention time (HRT) and efficient microbial zoning
• Less water → reduced digestate with lower handling and disposal costs
• Smaller footprint → lower CAPEX, faster ROI, and easier scalability
The outcome: even the most challenging feedstocks become reliable sources of clean energy and valuable fertilizer – delivered efficiently, sustainably, and profitably.
More gas. Less space. Faster returns.
Scalable for Any Project
Arciplug®’s PLUG FLOW digesters are flexible and scalable – designed to serve a wide range of project sizes and feedstock types:
- 30+ tons/day → Ideal for agricultural sites and digestate-focused applications
- 50–100+ tons/day → Suitable for MSW-based plants, hybrid operations, and commercial biogas production
- Works in both decentralized village-scale installations and centralized municipal hubs
- Proven across diverse settings: urban, rural, and industrial zones
The modular design enables fast scaling from small to large-scale plants – all with consistent reactor geometry and predictable performance.
Finnish Innovation – Locally Delivered
Build your biogas plant with advanced Finnish engineering combined with local expertise. Partnering with Arciplug® brings patented PLUG FLOW technology together with local manufacturing, assembly, and service support.
Our approach combines world-class engineering with the flexibility of local production. By utilizing standardized components and skilled local workshops, plants can be commissioned quickly and cost-efficiently.
We support our partners at every step — from planning and permits to commissioning, operation, and long-term optimization.
Smart Maintenance – no downtime
Eliminate downtime with Arciplug®’s service-friendly design. All maintenance is performed externally – no shutdowns, no slurry removal. Keep your biogas production running, always.
At the core of our design philosophy are reliability and ease of use. All maintenance can be performed without interrupting plant operations, ensuring continuous biogas production.
Operates without added water
Save precious water resources by eliminating the need for added water – even for municipal solid waste (MSW) or complex straw waste.
Arciplug®’s PLUG FLOW digesters process dry and fibrous materials directly, which means no more slurry preparation or water dilution steps. This simplifies operations, reduces ongoing operational costs, and enables superior biogas production from feedstocks that would otherwise require intensive preprocessing.”
Let’s save fresh drinking water together!
Reference
Proven in the field
Our digesters are turning diverse wastes into clean energy across Asia and Europe. Each project tells its own story.
Let’s combine our expertise to your business
Arciplug® is committed to walk with you throughout every stage: design, construction, operation and maintenance.
Are you ready to start the journey?
We are also constantly seeking collaborations and partnerships.
Are you the partner we have been looking for?
FAQ
Arciplug is a plug flow digester that can be fed daily. This gives a stable, high gas yield.
Dry and semi dry organic materials, municipal solid waste (we separate it mechanically), straw, napier grass, manure. For other feedstocks, please consult Arciplug experts.
Depends on the feedstock, but for example MSW 100 tons per day, napier 60 tons per day.
Depends on the feedstock and usage of the biogas and how much feedstock is needed to pretreat.
The digester needs one person to oversee the plant onsite or remotely if this is facilitated properly. Digester maintenance requires 1 to 2 hours of daily work.
Pre-treatment, biogas upgrading and fertilizer production may need 1 to 5 workers per shift.
Depends on the feedstock and usage of the biogas. Operation costs depend on the plant power usage and electricity price. The digester uses 1-3 % of the energy produced by the biogas plant.
There is no need for shutdowns. All maintenance can be done from outside the reactor.
The plant needs a road connection for operations, stable electricity connection 400V (or generator), mobile internet for remote control and water for normal cleaning.
Depends on the feedstock and how the output is post-treated. For example, MSW requires an area for separation.
Generally Arciplug biogas plants require less space than traditional solutions. The maximum plant dimensions range between 25 and 100 meters. Contact us for more information.
The process generates biogas and digestate which is then further separated into methane and fertilizer. Other end products include carbon dioxide and RDF from MSW. Biogas can be injected to the gas grid, used as fuel for vehicles and in electricity production or used for cooking.
Depends on the feedstock but generally it can be used as either organic fertilizer or as soil improvement material.
Process design, plant design, mechanical design, construction design, supervision, management, automation and operation support.
For pricing and quotes, please contact us at Arciplug. Together we can map your needs and the cost.
You can send your inquiries to this email address info@arciplug.com
Ready to build a high-efficiency biogas plant with Arciplug®’s patented PLUG FLOW technology?
Contact us to request a quote or book a meeting with our team — and let’s turn your organic waste into clean, renewable energy.