Integrated Technology Portfolio
High-Efficiency Membrane Concentration & Treatment Systems
Factory-prefabricated membrane skids and custom high-salinity digestate treatment solutions designed for instant off-grid deployment, high recovery, and industrial reliability.
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Global Renewable Gas Dynamics
The Industrial Transition from Raw Biogas Flaring to Pipeline-Quality RNG
The global renewable energy landscape is experiencing an unprecedented structural pivot toward Biomethane (Renewable Natural Gas, RNG). Mandated by aggressive decarbonization directives—such as the European Union's REPowerEU plan targeting 35 billion cubic meters (bcm) of biomethane production by 2030, and North America’s federal Renewable Fuel Standard (RFS) supported by Inflation Reduction Act (IRA) Section 45Z clean fuel production credits—raw biogas derived from anaerobic digestion can no longer be viewed as a simple flare gas or low-efficiency Combined Heat and Power (CHP) fuel.
Raw biogas typically contains 50%–65% methane (CH₄), 35%–48% carbon dioxide (CO₂), alongside aggressive trace impurities including hydrogen sulfide (H₂S: 200–10,000 ppmv), volatile organic silicon compounds (siloxanes: 5–40 mg/Nm³), moisture, and volatile organic compounds (VOCs). Transitioning this volatile mixture to pipeline injection specifications (e.g., DIN EN 16723-1, DVGW G 260, or American AGA Rule 30) requires extracting CO₂ down to <2%, removing sulfur to <1 ppmv, eliminating siloxanes to sub-detection thresholds, and suppressing methane slip to <0.5%.
Biogas Upgrading Technology Performance Comparison
Why multistage hollow-fiber polymer membranes are displacing traditional chemical and mechanical upgrading systems globally:
- Membrane Permeation: Zero chemical consumption, no wastewater discharge, dry process, >99% methane recovery rate, instantaneous ramp-up.
- Water Scrubbing: Severe water contamination risks, microbiological fouling in packing towers, massive parasitic electrical pumping loads.
- Amine Scrubbing: High thermal stripping penalty (0.5–0.8 kWh/Nm³ equivalent heat), hazardous amine degradation waste handling, solvent loss.
- Pressure Swing Adsorption (PSA): Complex multi-valve sequencing, valve seal leakage, higher methane losses (1.5%–3.5%), bulky footprint.
| Evaluation Parameter | Tongjie 3-Stage Membrane System | Water Wash (PWS) | Chemical Amine Wash | Pressure Swing Adsorption (PSA) |
|---|---|---|---|---|
| CH₄ Product Purity | 96.0% – 99.5% (Configurable) | 95.0% – 98.0% | >99.0% | 96.0% – 98.0% |
| Methane Slip (Loss to Off-gas) | < 0.5% (with recycling) | 1.0% – 2.5% | < 0.1% | 1.5% – 3.5% |
| Thermal Heat Consumption | 0.00 kWh/Nm³ (Zero Heat Req.) | None | 0.50 – 0.85 kWh/Nm³ (High) | None |
| Electrical Specific Power | 0.22 – 0.28 kWh/Nm³ | 0.26 – 0.35 kWh/Nm³ | 0.12 – 0.18 kWh/Nm³ | 0.25 – 0.32 kWh/Nm³ |
| Consumables / Chemical Waste | None (Dry Physical Separation) | Biocides, fresh water replenishment | Amine solvent refills & toxic sludges | Desiccant & carbon replacement |
| Footprint & Skid Integration | Compact ISO 40HC Shipping Container | Massive vertical absorption towers | High layout footprint, boiler required | Multiple large vertical pressure beds |
| Load Modulation Flexibility | 15% – 110% Turndown Instantly | 50% – 100% (Poor Turndown) | 40% – 100% | 50% – 100% |
Technical Authority & Reliability
Integrated Membrane Process Engineering & Factory Capabilities
Combining 17+ years of membrane innovation, 38+ national invention patents, and precision manufacturing across high-salinity digestate treatment and multi-gas separation skids.
Proprietary Hollow Fiber Membrane Packaging
Engineered high-selectivity polyimide and copolyimide hollow-fiber polymer membranes optimized for extreme CO₂/CH₄ separation factors (α > 35). High-pressure stainless steel housings capable of continuous operation up to 24 barg with zero interstitial seal degradation.
- 3-Stage cascade design achieving >99.5% methane purity
- Extended membrane element service lifecycle (8–10+ years)
- Precision back-pressure and sweep gas automation
Deep Pre-treatment & Contaminant Guard
Raw biogas destroys gas membranes if conditioning fails. Our factory manufactures integrated deep-dehydration and multi-stage carbon polishing units that strip aggressive moisture, volatile organics, and corrosive hydrogen sulfides before reaching the membrane boundary.
- Refrigeration dew-point control to -40°C pressure dew point
- Dual-bed regenerative activated carbon for total siloxane removal
- Coalescing particulate filtration rated to 0.01 micron
Total Digestate Zero Liquid Discharge (ZLD)
Unlike purely atmospheric gas suppliers, Tongjie leverages 15+ years of proprietary wastewater and DTRO/STRO expertise to solve the secondary environmental hurdle of AD plants: high-COD, high-ammonia anaerobic digestate treatment.
- DTRO disc-tube membrane concentration of digestate liquor
- High-ratio clean water recovery for plant reuse / boiler feed
- Concentrated N-P-K liquid bio-fertilizer valorization loop
Supply Chain & Factory Efficiency
Why International EPCs & Developers Partner with Tongjie ODM
Combining world-class component sourcing, automated orbital fabrication, and rapid modular skid assembly to deliver industrial biomethane hardware at 35%–45% reduced CAPEX.
Tier-1 Global Core Component Architecture
We eliminate supplier lock-in and quality anxiety. All Tongjie ODM biogas upgrading skids incorporate globally recognized brands including Siemens S7-1500 PLC, Burckhardt / Aerzen / BITZER screw compressors, Endress+Hauser & ABB gas analyzers, and Swagelok / Parker instrumentation valves.
Rapid Modular Containerization & FAT
Every unit is assembled in custom-built heavy-gauge ISO shipping containers (20ft, 40ft, or 45ft High Cube) equipped with internal explosion-proof HVAC, gas detection (CH₄, H₂S, O₂), and automatic fire suppression. Full 100% Factory Acceptance Testing (FAT) with pressurized helium/nitrogen loops guarantees immediate start-up on site.
Full International Certification Compliance
Tongjie holds Class II environmental engineering credentials, CE Machinery/Pressure Equipment Directives (PED 2014/68/EU), ATEX Directive 2014/34/EU (Zone 1 and Zone 2 compliance), ASME Boiler and Pressure Vessel Code (BPVC Section VIII Div 1), and IECEx certifications for hazardous industrial installations worldwide.
Deployment Scenarios
Engineered for Demanding Industrial & Agricultural Feedstocks
From complex landfill leachate gas to livestock manure slurries, our flexible pre-treatment and membrane arrays handle aggressive gas dynamics with zero operational degradation.
Agricultural Digesters & Livestock Mega-Farms
Treating raw biogas produced from dairy manure, swine slurry, and agricultural energy crops. High seasonal temperature fluctuations and fluctuating organic loading rates are neutralized using our automated inverter compressors and dynamic membrane stage recirculation.
- Feed Flow: 150 Nm³/h to 3,500 Nm³/h
- H₂S tolerance up to 4,000 ppmv with biological scrubbers
- Direct connection to virtual pipeline (Bio-CNG tube trailers)
Municipal WWTP Sewage Sludge Recovery
Municipal wastewater treatment facilities require maximum reliability and minimal site intervention. Tongjie containerized skids convert anaerobic digester biogas into pipeline-grade gas while simultaneously offering our DTRO technology to manage sludge centrate/filtrate.
- Dual siloxane adsorption beds with automated breakthrough sensors
- Unattended SCADA operation with cellular cloud telemetry
- Compliant with regional natural gas grid injection Wobbe indices
Landfill Gas (LFG) & Organic Waste Facilities
Landfill gas represents the most punishing biogas environment due to excessive nitrogen (N₂), oxygen (O₂), halides, and siloxanes. Our specialized pre-treatment trains and optional nitrogen-rejection polishing stages produce top-tier biomethane with zero membrane fouling.
- Halogenated hydrocarbon scrubbing & deep chilling (-20°C)
- Synergistic pairing with Tongjie Landfill Leachate ZLD plants
- Explosion-proof ATEX Zone 1 full skid package
System Architecture
The 5-Stage Tongjie Biogas Upgrading Engineering Train
A rigorous, closed-loop separation paradigm engineered to minimize parasitic energy use while ensuring 100% compliance with strict gas injection standards.
01
Raw Gas Conditioning
Mechanical cyclone water separation, chiller dehydration to 4°C, and dry iron-sponge or regenerative biological desulfurization reducing H₂S to <50 ppmv.
02
Compression & Oil Cleanse
Oil-injected screw compression to 14–18 barg with variable frequency drive (VFD). Multistage micro-fiber coalescing filters cut oil content below 0.001 ppmw.
03
Deep Purification Guard
Dual-tower regenerative desiccant adsorption drying to -40°C pressure dew point followed by temperature-controlled granular activated carbon beds targeting siloxanes & VOCs.
04
3-Stage Membrane Cascade
Raw gas feeds Stage 1 membranes; permeate (CO₂ rich) feeds Stage 2; retentate yields pure CH₄ (>99%). Stage 3 extracts residual methane from Stage 2 permeate back into compressor suction.
05
Grid Metering or Bio-CNG
Online gas chromatograph (CH₄, CO₂, O₂, H₂S, H₂O) with automatic odorization (THT / mercaptan), fiscal metering, and optional Bio-CNG 250 barg boosting or CO₂ liquefaction.
Optional Pure Food-Grade CO₂ Recovery Module
Convert your waste permeate stream into a high-margin secondary revenue source. Tongjie offers skid-mounted cryogenic liquefaction units producing 99.9% pure liquid CO₂ compliant with EIGA/ISBT food and beverage standards.
Zero Waste / Negative Carbon Footprint
Procurement Guide for EPCs
Total Cost of Ownership (TCO) & Engineering Specifications
When international project developers evaluate biogas upgrading equipment, initial capital expenditure (CAPEX) represents merely 25%–30% of the 10-year lifecycle cost. Operational expenditure (OPEX)—governed by electrical power efficiency, membrane lifespan, methane slip, and chemical consumables—dominates the project’s net present value (NPV).
Tongjie’s factory-direct ODM model eliminates intermediary markups while delivering European-grade component architectures. Our high-pressure 3-stage membrane loops avoid external heat utility requirements entirely, requiring only electrical connection. With an average specific consumption of just 0.22 – 0.28 kWh per Nm³ of raw biogas treated, operational savings routinely recover the hardware capital cost within 24 to 36 months of continuous operation.
Key Technical Specifications for Inquiry Submission
To receive a custom mass-balance projection and P&ID equipment proposal within 48 hours, prepare the following parameters:
- Raw Biogas Flow: Design Nm³/h, minimum and peak flow rates
- Gas Composition: % CH₄, % CO₂, % N₂, % O₂, ppmv H₂S, siloxanes mg/Nm³
- Target Delivery: Grid injection (barg pressure) or Bio-CNG (250 barg)
- Electrical Grid: Voltage, frequency (e.g., 400V/50Hz or 480V/60Hz)
- Site Footprint: Skid mounted indoors or fully weatherproof ISO container
Technical & Commercial FAQ
Frequently Asked Questions by Global Engineering Buyers
Expert engineering insights regarding membrane lifecycles, methane recovery, explosive hazard compliance, and turnkey factory integration.
What is the typical operational lifespan of your biogas upgrading membranes?
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Under standard operating conditions protected by Tongjie’s proprietary dehydration and dual-stage activated carbon guard beds, our hollow fiber polyimide membranes consistently achieve an operating lifecycle of 8 to 10+ years. Membrane replacement is modular and can be performed without plant shutdown by isolating individual membrane pressure vessels.
How do you guarantee methane slip remains below 0.5%?
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We utilize a patented 3-stage cascade membrane array. The permeate gas from Stage 1 (which contains elevated CO₂ alongside residual escaped methane) is routed as the feed stream into Stage 2. The permeate from Stage 2 is then directed to Stage 3 membranes, where residual methane is extracted and looped back to the primary compressor suction line. This closed-loop recirculation guarantees methane recovery >99.5% with methane slip <0.5%.
Can the system handle high hydrogen sulfide (H₂S) feedstocks?
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Yes. Depending on your feed gas analysis, we incorporate customized desulfurization stages. For concentrations up to 500 ppmv, our dual lead-lag iron sponge or metal-oxide media beds are utilized. For high-sulfur agricultural or municipal applications with 1,000–8,000 ppmv H₂S, we pre-integrate a biological desulfurization trickle bed or chemical wet scrubber skid, delivering <5 ppmv to the membrane inlet.
What international safety standards and explosion-proof ratings do you provide?
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All electrical assemblies comply with ATEX Directive 2014/34/EU (Zone 1 / Zone 2 certification) and IECEx standards. Control panels are fabricated to UL 508A / CE industrial machinery specifications. Containerized units feature non-sparking ventilation, integrated CH₄, H₂S, and O₂ gas detectors with automatic SIL-rated emergency shutdown (ESD) valves, and certified flame arrestors.
How does Tongjie solve the anaerobic digestate wastewater problem?
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As an established membrane water treatment manufacturer (holding Class II environmental engineering qualifications), Tongjie delivers an integrated solution: we couple our biogas upgrading skid with a Disc Tube Reverse Osmosis (DTRO) or Osmosis-Assisted Reverse Osmosis (OARO) digestate concentration system. This purifies the liquid digestate into clean reusable process water while concentrating high-value nitrogen-phosphorus-potassium organic fertilizer into a low-volume slurry.
What is your typical production lead time and site commissioning timeline?
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Standard containerized systems (from 250 Nm³/h to 2,000 Nm³/h) require 10 to 14 weeks for precision fabrication and full factory testing (FAT) at our Shanghai facility. Because units arrive fully pre-piped, pre-wired, and pressure-tested inside heavy-duty ISO shipping containers, on-site commissioning and grid synchronization require approximately 10 to 15 days with support from our global engineering dispatch team.
Do you offer private-label (ODM/OEM) branding for EPCs and engineering companies?
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Yes. A significant portion of our factory capacity is dedicated to ODM/OEM contracts for overseas equipment distributors and EPC engineering firms. We provide custom paint schemes, private-label documentation, client-specified PLC interfaces (Siemens, Rockwell/Allen Bradley, Schneider), and localized P&ID drawings matching your exact corporate identity.
How does ambient temperature variation affect system performance?
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Our containerized systems are engineered for harsh global environments ranging from -35°C (Nordic/Canadian winters) up to +50°C (Middle Eastern desert operations). Containers are insulated with rock-wool or polyurethane panels, fitted with explosion-proof HVAC heat-pump temperature regulators, and incorporate internal membrane stage heat recovery to maintain hollow fibers at their optimum operating temperature (35°C–45°C).
Comprehensive Membrane Catalog
High-Pressure Separation, Gas Degassing & Containerized Plants
Explore our extensive line of high-pressure DTRO/STRO membrane systems, deoxygenation equipment, and certified zero liquid discharge hardware.
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View SpecificationsRequest an Engineered Biogas Upgrading Proposal & Mass Balance Projection
Connect directly with our senior process engineers in Shanghai. Send us your raw gas composition, daily volumetric flow, and target outlet requirements—we will provide a comprehensive engineering FEED proposal, P&ID layout, and equipment quote within 48 business hours.