High-Precision Separation Systems
Precision Gas & Liquid Membrane Processing Modules
Pre-engineered, modularized solutions optimized for methane purity, gas stripping, zero-liquid discharge, and industrial process stability.
≥99.2%
CH4 Biomethane Purity
<0.5%
Methane Slip Loss
38+
Registered Invention Patents
100%
CE & ATEX Compliance Ready
Technical Engineering Standard
Next-Generation Biogas Upgrading Engineering Principles
Raw biogas produced via anaerobic digestion contains 50–65% CH₄, 35–45% CO₂, water vapor, trace siloxanes, and corrosive H₂S. Transforming this complex mixture into pipeline-ready Renewable Natural Gas (RNG) or Bio-CNG requires uncompromising gas scrubbing, multi-stage hollow fiber membrane permeation, and stringent pressure regulation.
Polyimide Membrane Permeation
Utilizing high-selectivity polyimide hollow-fiber membranes with high CO₂/CH₄ selectivity ratios. The 3-stage loop recovers residual methane from permeate streams, reducing overall slip below 0.5% without requiring cryogenic temperatures.
Catalytic Desulfurization & VOC Removal
Integrated chemical scrubbing alongside temperature-swing adsorption (TSA) beds configured to scrub H₂S to <1 ppm and trace siloxanes below detectable limits, protecting membrane longevity and downstream compressors.
Dynamic Thermal & Energy Integration
Equipped with variable frequency screw compression stations and heat exchange recovery circuits that capture compressor waste heat to provide auxiliary heating for adjacent anaerobic digestor stages.
| Upgrading Technology | Methane Purity (%) | Methane Recovery | OPEX / Chemical Load | Grid Injection Feasibility |
|---|---|---|---|---|
| Tongjie 3-Stage Polyimide Membrane | 98.5% – 99.5% | >99.5% | Ultra-Low (No chemicals, electricity only) | Optimal (Pipeline & Virtual Grid CNG) |
| Water Scrubbing (PWS) | 96.0% – 98.0% | 96.0% – 98.0% | High Water Consumption, Microbial Risk | Moderate (Requires extra dewatering) |
| Amine Chemical Absorption | >99.0% | >99.0% | Very High (Thermal heat for solvent boiling) | High (High capital footprint) |
| Standard Pressure Swing Adsorption (PSA) | 96.0% – 98.0% | 95.0% – 97.0% | Moderate (Valve wear & adsorbent replacement) | Moderate (Purge gas management needed) |
Supply Chain Excellence
Why Tier-1 EPCs Source Biogas Systems from Tongjie China
Combining heavy-industry precision fabrication with rapid integration of explosion-proof instrumentation, ASME/PED-rated pressure vessels, and comprehensive Factory Acceptance Testing (FAT).
Full-Chain Domestic Supply Control
From automated pipe spool orbital welding to Class II electrical instrumentation, our Shanghai production facility retains direct control over the balance of plant (BOP), ensuring 30–45% CAPEX savings without compromising component quality.
Rigorous CE & ATEX Compliance Testing
Every biogas upgrading skid manufactured undergoes hydrostatic pressure tests, nitrogen helium leak testing, and electrical ATEX Zone 1/Zone 2 hazardous area verification under strict notified-body audit frameworks.
Plug-and-Play Containerized Skid Architecture
Units are fully prefabricated within standardized 20ft or 40ft thermal-insulated marine containers. This eliminates lengthy on-site assembly, cutting field installation timelines down to just 10–15 operational days.
Macro Solutions
End-to-End Applications Across Worldwide Bioenergy Sectors
Configured for diverse raw biogas feedstocks, from landfill gas to concentrated industrial anaerobic wastewater effluent.
Agricultural Digesters & Livestock Slurry
Treating raw anaerobic gas from dairy manure and crop silage. Systems feature heavy-duty biological H₂S scrubbers capable of processing inlet sulfide concentrations exceeding 5,000 ppm while generating commercial RNG.
Municipal Wastewater Treatment Facilities (WWTP)
Upgrading sewage sludge digestion biogas for local municipal bus fleets or direct city-gas grid injection, transforming carbon compliance burdens into high-value renewable revenue streams.
Distillery, Starch & Food Processing Effluent
High-rate IC / UASB anaerobic reactors produce elevated biogas rates with fluctuating flows. Our multi-train dynamic throttling controls ensure continuous steady-state upgrading regardless of upstream batch cycling.
Technical FAQ
Frequently Asked Questions by International Engineering Buyers
Essential guidance on process verification, international certification, life-cycle economics, and membrane warranties.
How does Tongjie verify CE compliance for European biogas installations?
Our systems conform to the European Machinery Directive (2006/42/EC), Pressure Equipment Directive (PED 2014/68/EU), and ATEX Directive (2014/34/EU). Each pressure vessel, valve block, and control cabinet undergoes audited third-party certification prior to factory release, ensuring seamless integration into European regional grids.
What is the typical operating life expectancy of the gas separation membranes?
Under optimal conditioning with upstream moisture, H₂S, and siloxane removal, our high-selectivity polymer membranes exhibit a typical design lifecycle of 8 to 10 years. Real-time differential pressure telemetry alerts operators when preventative filter replacements or cleaning cycles are required.
Can the biomethane output handle direct compression into CNG or Bio-LNG?
Yes. The upgrading system can directly discharge into a secondary boosting compressor for Bio-CNG storage (200–250 bar) or integrate with sub-cooling liquefaction modules for high-density Bio-LNG production, fully respecting regional CO₂ specifications (≤50 ppm).
What documentation and validation packs accompany overseas deliveries?
Deliveries are backed by full ISO/CE design Dossiers, including P&ID blueprints, Functional Safety (SIL) assessments, Material Traceability Mill Test Reports (MTRs), electrical schematics, and comprehensive Operating & Maintenance (O&M) manuals in English.
Engineered Equipment Portfolio
High-Efficiency Membrane & Brine Recovery Solutions
Explore our industrial range of degasification modules, zero liquid discharge skids, and containerized treatment equipment.
