Remove hydrogen sulfide (H₂S) from biogas with Shijiazhuang Enric’s high-capacity systems—designed for landfills, wastewater plants, and agricultural digesters. Achieve ultra-low sulfur levels (<5 ppm) to protect your engines, turbines, and pipelines while meeting strict environmental regulations. As a subsidiary of China International Marine Containers (Group) Co., Ltd., we leverage 50+ years of pressure vessel expertise to deliver ASME, DOT, CE, and ISO 9001-certified equipment with global compliance.
High H₂S concentrations corrode equipment, reduce energy output, and trigger costly downtime. Our modular, scalable systems integrate seamlessly into existing biogas plants, with OEM/ODM customization and 60-day delivery from our 200,000 m² manufacturing base.
Get a Free Technical Consultation →Serving 40+ countries | 24/7 after-sales support | 2-year warranty
Biogas is a valuable renewable energy source, but hydrogen sulfide (H₂S)—a toxic, corrosive byproduct of anaerobic digestion—poses severe operational and financial risks. Here’s how untreated H₂S is draining your bottom line:
H₂S reacts with moisture to form sulfuric acid, accelerating corrosion in engines, boilers, and pipelines. According to the IEA’s Global Hydrogen Review 2025, unmitigated H₂S can reduce equipment lifespan by 40%, leading to:
Global emissions standards are tightening. In the U.S. (EPA 40 CFR Part 60) and EU (Directive 2015/2193), biogas H₂S limits are often <250 ppm for energy use and <5 ppm for grid injection. Non-compliance risks:
H₂S reduces biogas calorific value and clogs catalysts in CHP units. Per the MIT Future of Natural Gas Study, unprocessed biogas can lose 10–15% heating value, translating to:
H₂S is deadly at 100+ ppm (OSHA IDLH). Even low concentrations cause:
Utilities like PG&E (U.S.) and National Grid (UK) require biogas to meet pipeline-quality standards (e.g., H₂S <5 ppm). Without treatment, your biogas cannot be sold to the grid, limiting revenue streams.
H₂S’s "rotten egg" smell is detectable at 0.5–1 ppm. Landfills and farms face lawsuits and operational restrictions from odor nuisance complaints, as seen in California’s SB 1000 (2016) and EU’s Industrial Emissions Directive.
Bottom Line: For every $1 spent on H₂S removal, you save $3–$5 in avoided damages, fines, and inefficiencies (Source: AGF Renewable Natural Gas Supply Assessment 2025).
With 50+ years in gas processing and 20+ years in international markets, Shijiazhuang Enric delivers turnkey H₂S removal solutions tailored to your biogas composition, flow rate, and end-use requirements. Our systems are field-proven in landfills, wastewater treatment plants, and agricultural AD facilities across 40+ countries.
We offer three industry-leading H₂S removal methods, each optimized for specific applications:
| Technology | H₂S Removal Efficiency | Best For | Key Advantages | Operating Cost |
|---|---|---|---|---|
| Dry Media Scrubbing (Iron Sponge) | 90–99% | Low-to-medium H₂S (100–5,000 ppm) | ✅ Simple, low CAPEX ✅ No water or chemicals ✅ Easy disposal |
$0.01–$0.03/m³ |
| Wet Scrubbing (NaOH/Caustic) | 95–99.9% | High H₂S (5,000–20,000+ ppm) | ✅ Handles high concentrations ✅ Produces sulfur byproduct ✅ Continuous operation |
$0.02–$0.05/m³ |
| Biological Desulfurization | 95–99% | Medium H₂S (1,000–10,000 ppm) | ✅ Low operating costs ✅ Environmentally friendly ✅ No hazardous waste |
$0.015–$0.04/m³ |
| Activated Carbon Adsorption | 85–95% | Polishing (final <5 ppm) | ✅ Ultra-low outlet levels ✅ Removes siloxanes too ✅ Compact footprint |
$0.03–$0.06/m³ |
| Parameter | Standard Range | Custom Options |
|---|---|---|
| Flow Rate | 100–10,000 Nm³/h | Up to 50,000 Nm³/h |
| Inlet H₂S | 50–20,000 ppm | Up to 50,000 ppm |
| Outlet H₂S | <5 ppm | <1 ppm (for grid injection) |
| Pressure Drop | <50 mbar | Ultra-low <20 mbar |
| Operating Temperature | 0–50°C | Extended range (-20°C to 80°C) |
| Material | Carbon steel (epoxy-coated) | Stainless steel (304/316L), FRP |
| Automation | PLC control, remote monitoring | SCADA integration, IoT sensors |
| Footprint | Skid-mounted (20–40 ft containers) | Modular, multi-stage systems |
Our 200,000 m² manufacturing base in Shijiazhuang, China
Skid-mounted biogas H₂S removal system in production
We benchmarked our biogas H₂S removal systems against leading competitors in price, service, and quality—here’s why purchasing managers choose Enric:
| Feature | Shijiazhuang Enric | Competitor A (Europe) | Competitor B (U.S.) | Competitor C (India) |
|---|---|---|---|---|
| Price (1,000 Nm³/h system) | $80,000–$120,000 | $150,000–$200,000 | $180,000–$250,000 | $70,000–$90,000 |
| Lead Time | 60 days (30-day expedited) | 120–180 days | 90–150 days | 90–120 days |
| Warranty | 2 years (extendable to 5) | 1 year | 1–2 years | 1 year |
| Certifications | ASME, DOT, CE, ISO 9001, ATEX, CCC | CE, ATEX | ASME, EPA | ISO 9001 |
| Customization | Full OEM/ODM (materials, automation, footprint) | Limited (standard models) | Moderate (engineering fees apply) | Basic |
| After-Sales Support | 24/7 global team + local partners | Business hours (Europe) | Business hours (U.S.) | Limited (email/phone) |
| H₂S Removal Efficiency | 99.9% (all technologies) | 95–99% | 98–99.5% | 90–95% |
| Operating Cost | $0.01–$0.05/m³ | $0.03–$0.08/m³ | $0.04–$0.10/m³ | $0.02–$0.06/m³ |
| Global Compliance | Yes (EPA, EU, India, etc.) | EU-focused | U.S.-focused | India-focused |
| Supply Chain Resilience | Vertical integration (in-house manufacturing) | Outsourced | Outsourced | Outsourced |
Our China-based supply chain and vertical integration allow us to undercut competitors by 30–50% without compromising quality. Here’s how:
Example ROI: A 2,000 Nm³/h landfill gas project in the U.S. saves $200,000/year by choosing Enric over a U.S. supplier, with payback in 18 months.
Client: A major U.S. waste management company (Fortune 500)
Challenge: Landfill gas with 12,000 ppm H₂S was corroding their 3.2 MW CHP engines, causing $150,000/year in maintenance costs.
Solution: Two-stage wet scrubbing system (NaOH + iron sponge polishing) with automated pH control.
Results:
Client: Municipal wastewater facility (10,000 m³/day capacity)
Challenge: Biogas with 3,500 ppm H₂S was failing EU grid injection standards (<5 ppm). Chemical scrubbing costs were €0.07/m³.
Solution: Biological desulfurization system with proprietary microbial consortium.
Results:
Client: 500-head dairy farm with anaerobic digester
Challenge: Biogas with 800 ppm H₂S was damaging their 500 kW generator. Local solutions were unreliable and expensive.
Solution: Iron sponge + activated carbon skid (plug-and-play design).
Results:
Answer: The optimal technology depends on your H₂S concentration, flow rate, and end-use:
Pro Tip: For landfill gas, we recommend a multi-stage system (e.g., wet scrubbing + carbon adsorption) to handle both H₂S and siloxanes.
Answer: System sizing depends on:
Our engineers use proprietary software to model your specific conditions. Request a free sizing analysis →
Answer: Maintenance varies by technology:
| Technology | Maintenance Tasks | Frequency | Cost (Annual) |
|---|---|---|---|
| Iron Sponge | Media replacement | Every 6–12 months | $2,000–$5,000 |
| Wet Scrubbing | Chemical replenishment, pH adjustment | Monthly | $5,000–$15,000 |
| Biological | Nutrient addition, biomass monitoring | Quarterly | $1,000–$3,000 |
| Activated Carbon | Carbon replacement | Every 3–6 months | $3,000–$10,000 |
Enric Advantage: All systems include remote monitoring to predict maintenance needs and reduce downtime by 50%.
Answer: Yes! We offer integrated solutions for multi-contaminant removal:
Example: A landfill gas project in India used our 4-stage system (scrubber + siloxane filter + dryer + polishing carbon) to achieve pipeline-quality gas.
Answer:
(Negotiable for large orders; LC at sight accepted.)
Answer: Yes! We provide:
Cost: $3,000–$10,000 (varies by project size and location). Travel and accommodation are billed separately.
Answer: Our warranty covers:
Warranty Exclusions: Damage from improper operation, natural disasters, or unauthorized modifications.
Claim Process: Submit a report within 48 hours of issue detection. Our team will diagnose and replace defective parts within 14 days.
Answer: We design systems to meet global and local standards, including:
All systems are third-party certified (e.g., TÜV, SGS, Bureau Veritas) and come with compliance documentation for permitting.
Stop letting H₂S corrode your equipment, violate regulations, and waste your biogas potential. Shijiazhuang Enric’s industrial-grade H₂S removal systems deliver:
🔥 Limited-Time Offer: Order by June 30, 2026, and receive:
💡 Risk-Free Guarantee: If our system doesn’t meet your H₂S removal targets, we’ll refund 100% of your payment or replace the system for free.
Project Manager, Clean Energy Solutions (USA)
★★★★★ (5/5)
“We installed Enric’s wet scrubbing system at our landfill in Texas, and it’s been a game-changer. The H₂S levels dropped from 15,000 ppm to below 2 ppm overnight. The system is robust, easy to maintain, and their team provided excellent training. The 2-year warranty gave us confidence, and their 24/7 support has been responsive. Highly recommend for anyone struggling with high H₂S in biogas.”
Posted on: March 15, 2026
Technical Director, GreenGas BV (Netherlands)
★★★★★ (5/5)
“As a European company, we were skeptical about sourcing from China, but Enric’s CE and ATEX certifications put our minds at ease. Their biological desulfurization system was 40% cheaper than local options and just as effective. The remote monitoring has been a lifesaver—we can track performance in real-time. Delivery was on schedule, and the system has exceeded our expectations.”
Posted on: February 28, 2026
Operations Head, BioEnergy India
★★★★☆ (4/5)
“Enric’s iron sponge system was the perfect fit for our agricultural biogas plant. It’s simple, reliable, and requires minimal maintenance. The only reason I’m giving 4 stars is that the lead time was slightly longer than promised (75 days instead of 60), but the quality and price more than made up for it. Their local distributor in Mumbai has been very supportive.”
Posted on: April 2, 2026
Facility Manager, EcoWaste (Mexico)
★★★★★ (5/5)
“We needed a quick solution for our wastewater treatment plant, and Enric delivered in just 45 days. Their activated carbon polishing system brought our H₂S levels down to 1 ppm, meeting the strict standards for our CHP engine. The system was easy to install, and their Spanish-speaking support team was a huge plus. Would definitely work with them again.”
Posted on: March 30, 2026
Environmental Engineer, Sustainable Biogas UK
★★★★★ (5/5)
“Enric’s multi-stage system (wet scrubbing + carbon adsorption) solved our siloxane and H₂S problems in one go. The system is now protecting our CHP engine and allowing us to sell excess biogas to the grid. Their compliance documentation made the permitting process smooth, and their UK distributor provided excellent on-site support. A top-notch solution at a competitive price.”
Posted on: April 10, 2026
Client from Germany discussing technical specifications
Client from USA confirming order details
Client from India requesting after-sales support
Senior Gas Purification Engineer
Shijiazhuang Enric Gas Equipment Co., Ltd.
With 20+ years of experience in gas processing and purification, Li Wei is a leading expert in biogas H₂S removal, CO₂ capture, and gas drying technologies. He holds a Ph.D. in Chemical Engineering from Tsinghua University and has authored 15+ patents in gas treatment innovations.
Li Wei has overseen 200+ biogas projects globally, from landfill gas-to-energy plants in the U.S. to agricultural digesters in Europe and Asia. His expertise spans system design, compliance, and optimization, ensuring Enric’s solutions meet the highest standards of efficiency, reliability, and cost-effectiveness.
Connect with Li Wei:
-Hengkai Natural Gas Liquefaction Project
-Changming Phase II Natural Gas Liquefaction Project
-Hwange Natural Gas Liquefaction Project
-Tianhao Coalbed Methane Liquefaction Project
-Tianyun Coalbed Methane Liquefaction Project
-Shuntai Coalbed Methane Liquefaction Project
-60.000 cubic meters/day
-60.000 cubic meters/day
-60.000 m3/day*2 sets
-200.000 cubic meters/day
Trusted by Global Leaders in Energy & Waste Management
🏆 Our Clients
“Enric’s H₂S removal system resolved our corrosion issues overnight. Their wet scrubber handled our 18,000 ppm H₂S with ease, and the 2-year warranty gave us peace of mind. Delivery was on time, and their team provided exceptional startup support.”
— John Carter, Operations Manager, Waste Management Inc. (USA)
“We tested three suppliers for our German biogas plant. Enric’s biological desulfurization system was the only one that met EU standards at a competitive price. Their CE and ATEX certifications made permitting seamless.”
— Klaus Schmidt, Technical Director, Bioenergie GmbH (Germany)
“In Thailand, we needed a robust, low-maintenance solution for our farm’s biogas. Enric’s iron sponge system was half the cost of European options and just as reliable. Their local distributor provided excellent service.”
— Somchai Wong, Owner, Green Dairy Farm (Thailand)
📜 Certifications & Compliance
ISO 9001
ASME
CE
DOT
ATEX
CCC
*All systems comply with local biogas H₂S removal regulations, including EPA 40 CFR Part 60, EU Directive 2015/2193, and India’s CPCB guidelines.