Turn raw biogas into valuable renewable natural gas (RNG) or biomethane. Our biogas upgrading equipment gives you a sustainable path to waste‑to‑energy conversion and real carbon reduction. With biomethane now in demand for grid injection, vehicle fuel, and carbon credits, more project developers and investors are seeing the opportunity. If you have access to biogas from landfills, farms, or wastewater treatment, now is the right time to invest in a profitable Biowatt‑biogas upgrading system.

What Is Biogas Upgrading? – How Raw Biogas Becomes RNG

Biogas upgrading is a gas purification and separation process. It removes impurities (H₂S, H₂O, VOCs) and separates CO₂ from methane, turning raw biogas into high‑purity biomethane. Here’s how the material conversion works:

Raw Material: Biogas	Upgrading Process – Two Essential Steps	End Product: Biomethane (RNG)
Biogas is a renewable gas made by anaerobic digestion of organic matter. It’s one of the most widely available low‑carbon energy sources. Main components: Methane (CH₄): 50–70% – the valuable energy fraction Carbon Dioxide (CO₂): 30–50% – needs to be separated Hydrogen Sulfide (H₂S): 100–5,000 ppm – corrosive, must be removed Moisture (H₂O): saturated – will damage equipment if not dried	Step 1: Pre‑treatment (Desulfurization & Dehydration) Removes H₂S to below 50 ppm using either a biological desulfurization system or dry desulfurization towers, then lowers the dew point to ≤4–10°C (cold drying booster system), protecting downstream components. Step 2: CO₂ Separation (Membrane / PSA / Water Scrubbing) Under controlled pressure, CO₂ is separated from CH₄, raising methane concentration to 95–99% while preventing methane loss (anaerobic conditions).	Pipeline‑grade quality – meets natural gas standards (≥96% CH₄, <1% O₂, <3% CO₂) High energy density – ~36 MJ/m³ Carbon‑negative potential – generates carbon credits (RINs, voluntary market)

Biowatt‑Biogas® Biogas Upgrading Technology – Certified & Compliant

Core Technology 1: In‑House Membrane Separation System

Our proprietary membrane technology delivers >99.5% methane recovery while keeping energy use low. The selective membranes efficiently separate CO₂ from CH₄, in either single‑stage or multi‑stage setups.

• Maximize biomethane yield – >99.5% recovery rate
• Lowest power consumption in its class – 0.26–0.29 kWh/Nm³ of biogas
• Modular design – easily scale from 50 Nm³/h to more than 2,000 Nm³/h
• No chemicals needed – simple operation and maintenance

Core Technology 2: Integrated Pre‑treatment & Drying Module

This fully automated desulfurization and dehydration unit (paired with our cold drying booster system) cuts H₂S to <50 ppm and lowers the dew point to ≤4°C, protecting your membrane modules and ensuring long‑term stability.

• Prevents membrane fouling and extends system life
• Reduces downtime – continuous operation up to 8,000+ hours per year
• Ensures environmental compliance with controlled VOC/H₂S removal
• Avoids frequent manual cleaning – lowers labor intensity

Containerized Membrane Separation System – High‑Efficiency Biogas Upgrading

Our containerized membrane separation system uses a 3‑stage membrane arrangement with thousands of hollow‑fiber modules. CO₂ selectively permeates through the membrane while methane is retained, producing pipeline‑grade RNG. The system runs at room temperature – no external heat, no chemicals, no process water, and no wastewater.

• High methane recovery – up to 99.6%
• Low parasitic energy – only 0.26–0.29 kWh/Nm³ of biogas
• Fully automatic start‑up, turndown, and process control with remote monitoring
• Adjustable methane content – meets any gas grid specification
• No chemicals, solvents, or biological risks – safe and eco‑friendly
• No thermal oxidizer or flare – tail gas can be recycled or vented safely

3‑Stage Membrane Technology

The patented 3‑stage design ensures maximum purity and recovery: Stage 1 removes bulk CO₂, Stage 2 polishes the product gas, Stage 3 recovers methane from the permeate stream.

• >99.5% methane purity – ready for grid injection or Bio‑CNG
• >99.5% methane recovery – no valuable gas wasted
• Stable performance even with fluctuating biogas composition (40–70% CH₄)

Plug‑and‑Play Containerized Design

Fully pre‑assembled in ISO containers, the system arrives on‑site ready to connect. No civil works, no complex piping – just hook up the biogas inlet, power, and gas outlet.

• Reduce onsite installation time by 70% vs. stick‑built systems
• Modular scaling from 80 Nm³/h to 12,000 Nm³/h – add containers as your project grows
• Low maintenance – hollow‑fiber membranes last 8–10 years with minimal service

Processing capacity range: 80 – 12,000 Nm³/h (single skid to multi‑container farms)

Featured Projects – Real‑World Performance

Bio‑CNG Plant – Guangxi, China	RNG Project – Shandong, China	PepsiCo® Food Waste Energy – Shanghai, China
Feedstock: Cassava residue + swine manure Capacity: 20,000 Nm³/d End product: Bio‑CNG with >97% CH₄ purity Achievements: Converted agricultural waste into vehicle fuel; meets CNG station standards; reduces fossil gas dependence.	Feedstock: Chicken manure (high‑sulfur) Capacity: 42,000 Nm³/d End product: Grid‑quality RNG Achievements: Processed high‑H₂S biogas without membrane damage; delivered pipeline‑grade gas; industrial‑scale reliability.	Feedstock: Potato waste End use: On‑site energy / RNG Special: Zero‑waste compliance Achievements: Zero‑waste discharge for global brand; turned disposal cost into revenue; aligned with ESG goals.

Available Biogas Sources for Upgrading

Applications of Biomethane (RNG) from Biogas Upgrading

Why upgrading to biomethane beats direct biogas use: Higher revenue (10–30× per energy unit), carbon credits (RINs, LCFS), and interchangeable with natural gas.

Economic Feasibility of Biogas Upgrading Equipment

Compare Biogas Utilization Methods – Why Upgrading to Biomethane Wins

Bottom line: If you have excess biogas or want to maximize revenue and carbon markets, biogas upgrading is the smarter choice. Payback typically 2–5 years.