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One size doesn’t fit all when it comes to EtO abatement
If your facility emits ethylene oxide (EtO), you know the stakes: compliance, community relations, safety, and long-term operational reliability. But with different scrubber technologies available, each with its own strengths, it’s easy to feel stuck.
Do you retrofit your existing unit? Start from scratch? Choose something small and passive? Or go all in with a high-capacity smart scrubber?
This guide helps you cut through the complexity and match the right EtO scrubber to your specific setup.
Compliance is driving change, but not always clarity
Regulators are tightening EtO thresholds, often demanding sub-1 ppm emission levels, as outlined in the new 2024 EPA regulation. But meeting those targets isn’t just about picking the highest-performing technology, it’s about picking what fits your emissions, layout, staffing and budget.
Some systems are overkill. Others fall short. The best fit meets both your technical and practical needs.
First, understand your EtO profile
Before choosing a scrubber, ask:
What’s your average EtO load? (ppm and m³/h)
Is the emission continuous or in peaks?
How much space is available?
Can your team manage chemical handling?
Are you upgrading or starting fresh?
Your answers will guide the tech match.
The three main EtO options
1. Acid-based scrubber
Traditional system using sulfuric acid to absorb EtO
Proven performance but higher operational cost
Requires chemical handling, pH monitoring, waste disposal
Best for: legacy setups where chemical logistics are already in place
2. Smart scrubber (with solid catalyst)
Uses a water loop and solid catalyst to hydrolize EtO
No acid, low maintenance
Excellent for high-load, continuous operations
Can be retrofitted into existing housings
Best for: facilities upgrading from acid scrubbers or scaling operations with minimal intervention
3. bEtOfilter (passive unit)
Designed for low-load, continuous emission points
Water-based and chemical-free
Ideal for aeration rooms or decentralised sources
Best for: sterilisation rooms or warehouse applications needing simple, plug-and-play EtO removal
Choosing by scenario
Facility type | Ideal scrubber type |
|---|---|
Large-volume sterilisation | Smart scrubber |
Aeration room | bEtOfilter |
Legacy chemical setupp | Acid scrubber (or retrofit) |
Budget-sensitive upgrade | Smart retrofit or bEtOfilter |
Operator-light environment | Smart or bEtOfilter |
Real-world insight: Retrofit vs new install
A mid-size sterilisation company was operating an acid scrubber but struggling with weekly maintenance and safety reviews. Additionally, disposing of the acidic ethylene glycol solution was getting expensive. They didn’t want to rebuild from scratch.
By retrofitting with a smart scrubber, keeping the housing, they dropped emissions to <1 ppm, removed all chemical handling, and reduced OPEX significantly.
In contrast, a logistics company needed something for low-load emissions near their EtO storage zone. They installed a bEtOfilter that required minimal power, no chemical handling, and less than one hour of operator training.
For setups that don’t fit the standard mold, Trevi also offers custom-engineered EtO solutions to meet mixed or non-linear emission patterns.
Still unsure? Prioritize what matters
When it comes to EtO scrubber selection, base your choice on these key drivers:
Performance (ppm target)
Maintenance level
Footprint
Chemical handling risk
Installation impact
Each of the three systems solves a different problem. The best decision is the one aligned with your reality, not just the spec sheet.
Want help matching the right scrubber to your emissions profile? Let's talk. I'll walk you through your options based on load, layout and long-term goals.