High-Efficiency Treatment & Separation Units
Pre-engineered containerized skids manufactured under ISO 9001 and CE conformity standards.
Engineering Biomethane Purity: Industrial Standards & Decarbonization
Bridging feedstock heterogeneity with strict grid injection specifications (EN 16723-1) through advanced three-stage membrane separation, regenerative biological desulfurization, and automated pressure-swing thermodynamics.
From Raw Biogas to Pipeline-Grade RNG
Raw biogas harvested from anaerobic digestion typically consists of 50–65% Methane (CH₄), 35–45% Carbon Dioxide (CO₂), along with trace impurities such as Hydrogen Sulfide (H₂S, up to 10,000 ppm), volatile organic siloxanes, moisture (saturated vapor), and particulate matter. To convert this low-calorific fuel into pipeline-quality Renewable Natural Gas (RNG) or vehicle-grade Bio-CNG, an upgrading plant must strip away non-methane compounds to achieve CH₄ concentrations exceeding 97–99% while maintaining methane slip below 0.5%.
As an ISO 9001, ISO 14001, and ISO 45001 certified manufacturer with Class II Contracting Qualifications in Environmental Protection Engineering, we provide complete, pre-assembled, CE-certified biogas upgrading units built with high-selectivity polyimide hollow fiber membranes and intelligent PLC-controlled gas conditioning loops.
CE Certification & Safety Integrity Level (SIL)
Our biogas upgrading facilities conform strictly to the European Union Pressure Equipment Directive (PED 2014/68/EU), ATEX Directive (2014/34/EU) for explosive atmospheres, and Machinery Directive (2006/42/EC). Systems integrate Ex-d explosion-proof electrical controls, multi-point optical methane telemetry, dual venting safety circuits, and SIL-2 certified emergency shutdown architectures.
Standard Compliance Guarantee
Effluent gas streams satisfy the strict chemical and calorific profiles demanded by EN 16723-1 (Natural gas and biomethane for use in transport and biomethane for injection in the natural gas network) and DVGW G 260 / G 262 parameters.
Comparative Analysis of Core Biogas Upgrading Technologies
Selecting the optimal technological route based on flow capacity, OPEX requirements, and grid injection tolerances.
| Evaluation Parameter | 3-Stage Membrane Permeation | Water Scrubbing (PWS) | Chemical Amine Absorption | Pressure Swing Adsorption (PSA) |
|---|---|---|---|---|
| CH₄ Purity | Up to 99.0% | 96.0% – 98.0% | >99.5% | 96.0% – 98.0% |
| Methane Slip | <0.5% (with recycle) | 1.0% – 2.0% | <0.1% | 1.5% – 3.0% |
| Consumables / Chemicals | None (Dry Physical) | Fresh water make-up | Amine solvent regeneration | Adsorbent Zeolite media replacement |
| Power Demand (kWh/Nm³) | 0.20 – 0.28 | 0.25 – 0.35 | 0.12 (High thermal input needed) | 0.25 – 0.32 |
| Turndown Ratio | 30% – 110% (Instantaneous) | 60% – 100% | 40% – 100% | 50% – 100% |
| Skid Footprint | Ultra-compact / Containerized | Large (Tall Absorption Columns) | Medium (Requires Reboilers) | Medium (Pressure Vessels) |
Localized Application Scenarios Across Global Industries
Tailored engineering designs addressing regional feedstocks, climate extremes, and distinct commercial valorization pathways.
Agricultural Digesters & Livestock Waste
Engineered for high-ammonia and varying moisture biogas streams from bovine, swine, and dairy manure. Combines chemical precipitation, biological trickle-bed scrubbers, and modular multi-stage membranes.
- Slurry Pretreatment
- Zero Ammonia Carryover
- On-Farm Modular Skids
Municipal Wastewater & Sewage Sludge
Continuous stabilization of anaerobic sludge digester gas. Incorporates regenerative deep desulfurization and carbon filtration arrays to protect membranes from competitive VOC adsorption and siloxane poisoning.
- Siloxane Removal <0.1mg/Nm³
- Co-Generation Integration
- Urban Odor Elimination
Food & Beverage Organic Effluents
Optimized for processing effluent from high-COD breweries, distilleries, and starch factories. Features rapid load-tracking controls capable of responding to batch discharge fluctuations without loss of methane purity.
- Rapid Load Tracking
- High H₂S Tolerance
- Brewery & Distillery Grade
Municipal Solid Waste (MSW) & Landfill Gas
Specialized LFG extraction and upgrading complexes built with aggressive nitrogen/oxygen stripping systems, cryogenic pre-coolers, and heavy hydrocarbon guard beds to eliminate chlorinated VOC hazards.
- N₂/O₂ Rejection Loops
- Halogenated VOC Guard
- Deep Chilling Dewatering
Decentralized Microgrid & Virtual Pipelines
Plug-and-play containerized biogas upgrading skids coupled with integrated CNG tube-trailer loading stations, delivering merchant biomethane from remote rural digesters without pipeline connections.
- 250 bar CNG Dispensing
- Remote Telemetry SCADA
- Off-Grid Autonomous Logic
Chinese Factory Resilience & Supply Chain Efficiency
How our vertically integrated Shanghai facility eliminates supply chain bottlenecks, lowers capital expenditure, and accelerates site deployment.
Vertical In-House Fabrication
By conducting design, pressure vessel rolling, automatic orbital welding, chemical passivation, and PLC programming under one roof, we eliminate subcontractor delays and maintain rigorous quality verification across all ASME/PED pressure boundaries.
Tier-1 Component Integration
We combine domestic economies of scale with internationally recognized brands: Siemens S7-1500 safety PLCs, Atlas Copco oil-free screw compression stages, Evonik polyimide hollow fiber gas separation membranes, and Endress+Hauser instrumentation.
Full Factory Acceptance Testing (FAT)
Every biogas upgrading skid undergoes multi-stage helium leak detection, electrical insulation verification, hydrostatic pressure validation, and automated control sequence testing at our factory prior to overseas crating and shipping.
Technology Roadmap: The Future of Biogas Upgrading
Anticipating the technological convergences that will define clean energy infrastructure over the next decade.
CCUS & Food-Grade Liquid CO₂ Valorization
Transforming the permeate waste stream into a commercial revenue source. Our advanced cryogenic condensation units liquefy separated CO₂ into 99.9% purity industrial or food-grade liquid carbon dioxide, achieving 100% carbon utilization.
Biological Methanation (Power-to-Gas)
Coupling off-grid green hydrogen production with biogas facilities. Utilizing hydrogenotrophic archaea within pressurized catalytic bioreactors, residual CO₂ is reacted with green H₂ to synthesize additional biomethane (4H₂ + CO₂ → CH₄ + 2H₂O).
AI-Driven Membrane Health Prediction
Integrating pressure transducer edge telemetry with cloud digital twins to monitor real-time membrane selectivity drift, calculate boundary layer concentration polarization, and optimize thermal regeneration cycles autonomously.
Localized Support & Global Compliance Framework
Ensuring operational reliability, environmental safety, and smooth local grid interconnection across international borders.
Turnkey Engineering Dossier & Validation
To accelerate regional environmental impact permitting and utility connection, Tongjie provides complete engineering documentation packages: Process Flow Diagrams (PFD), Piping & Instrumentation Diagrams (P&ID), 3D Navisworks Models, Hazardous Area Classification Dossiers (EN 60079), Electrical Single-Line Diagrams, and CE Declarations of Conformity.
Global Remote Diagnostics & Rapid Field Support
Through our secure encrypted IoT telemetry gateways, our senior gas processing engineers in Shanghai perform continuous system health monitoring, remote software tuning, and immediate fault resolution. Critical consumables, seal kits, and spare membrane modules are stocked for fast dispatch across key overseas hubs.
Containerized Desalination & Purified Water Plants
Modular, factory-tested skids for specialized process water, municipal reuse, and pure water generation.
Frequently Asked Questions
Comprehensive engineering and procurement answers for EPC contractors, biogas project developers, and plant operators.