Complete H₂S Elimination in a Wet Scrubber
A Houston study on a natural-gas stream carrying 2,000 mg/L hydrogen sulfide, scrubbed with JC 9450 ROS chemistry.
JC 9450 completely eliminated 2,000 mg/L of hydrogen sulfide from a Houston natural-gas stream treated in a wet scrubber. Its reactive oxygen species oxidized sulfide to inert sulfate rather than transferring it to a spent-media waste stream, shifting scrubber ORP from about -150 mV to +100 mV at $0.0040 per pound removed.
Last updated 5 August 2026
The Problem
What was the H2S problem?
A Houston natural-gas stream carried 2,000 mg/L of hydrogen sulfide (H₂S) along with 5% CO₂. Any gas above 10 ppmv H₂S is classed as "sour," and at 2,000 mg/L this stream was far into corrosive, hazardous territory — a threat to equipment, safety, and downstream processing.
The reducing chemistry of the stream registered a negative oxidation-reduction potential of roughly −150 mV, the signature of an environment where sulfide dominates.
The Program
How did Jenfitch treat the scrubber?
JC 9450 was applied in the wet-scrubber circuit, where its reactive oxygen species oxidize hydrogen sulfide directly. Rather than transferring the problem to a spent-media waste stream, the reaction converts sulfide to inert sulfate.
- JC 9450 ROS oxidized the H₂S in the scrubber liquor on contact.
- ORP was driven from roughly −150 mV up to +100 mV, crossing from a reducing to an oxidizing regime.
- The only residuals left behind were inert sulfates — no hazardous by-products.
- Treatment cost landed at just $0.0040 per pound of H₂S removed.
The Data
What were the results?
| Metric | Before | After |
|---|---|---|
| H₂S in gas stream | 2,000 mg/L | Completely eliminated |
| ORP | −150 mV | +100 mV |
| Residuals | Sulfide (corrosive) | Inert sulfates only |
| Cost per lb H₂S removed | — | $0.0040 |
Sour gas to clean, at fractions of a cent
The scrubber completely eliminated 2,000 mg/L of H₂S, shifted ORP from −150 to +100 mV, and left only inert sulfate residuals — all for $0.0040 per pound of H₂S removed.
The Chemistry
Why does oxidation beat transfer?
Most conventional approaches to hydrogen sulfide do not destroy it — they move it. Solid scavenger media bind sulfide onto a bed that eventually saturates and has to be pulled, hauled, and disposed of as a hazardous waste. Liquid triazine scavengers bind sulfide into a reaction product that still has to leave the site. In both cases the operator is paying twice: once for the chemistry, and again for the disposal of whatever the chemistry produced.
Mineral oxychloride chemistry works differently. It delivers reactive oxygen species at an oxidation potential of 2.8–2.9 V — well above ozone at 2.07 V and more than double sodium hypochlorite at 0.94 V — and that potential is high enough to oxidize sulfide straight through to sulfate. Sulfate is inert, water-soluble, and already present in most process streams. There is no spent bed and no reaction product to manifest.
That difference is what produced the $0.0040-per-pound figure. The cost is the chemistry alone, because nothing downstream needs handling.
Operating Guidance
Running the scrubber on ORP
The practical control variable in a wet scrubber is not dose in parts per million — it is oxidation-reduction potential. Sulfide loading swings with the incoming gas, so a fixed ppm feed is either wasteful when the stream is lean or short when it is rich. Feeding to an ORP setpoint lets the system self-correct.
For H₂S control in scrubbers the working band is +100 to +300 mV. Below zero, sulfide is still present and the liquor is chemically reducing. Crossing into positive territory is the measurable signal that free sulfide has been consumed. The Houston study landed at +100 mV, the bottom of that band — complete elimination at the lowest chemical demand, which is exactly where an operator wants to sit.
As a starting point for sizing, roughly 1 mg/L of product per 2.0 mg/L of H₂S is the published rule of thumb, with the ORP controller trimming from there. The chemistry stays effective across a pH range of 4 to 9, which covers essentially every scrubber liquor in service. Installation is modest: a metering pump, a storage tank, and an ORP probe and controller.
The same control logic carries over to the rest of the sour-service problem — iron sulfide, downhole biofilm, and produced water all respond to the same ORP-driven feed.
Documentation
Read the full study
Related: Cooling Towers & Scrubbers research · Oil & Gas research
Frequently Asked Questions
About this H₂S scrubber study.
How much H₂S was in the stream?
The Houston natural-gas stream carried 2,000 mg/L of H₂S plus 5% CO₂. Any gas above 10 ppmv H₂S is considered "sour," so this was heavily loaded, and JC 9450 eliminated it completely. At that loading the stream was corrosive and hazardous, a threat to equipment, safety, and downstream processing, and its reducing chemistry registered an oxidation-reduction potential of roughly -150 mV before treatment.
What does the ORP shift mean?
ORP moved from about −150 mV to +100 mV, crossing from a reducing (sulfide-dominated) environment to an oxidizing one, the measurable signature of the sulfide being oxidized away. Oxidation-reduction potential is the millivolt measure of how oxidizing or reducing a solution is, so a negative reading indicates sulfide dominance and a positive reading indicates that the reactive oxygen species chemistry now controls the scrubber liquor.
What residuals are left behind?
Only inert sulfates. The reaction oxidizes hydrogen sulfide rather than transferring it to a hazardous spent-media stream, so there are no corrosive or hazardous by-products to manage. JC 9450 was applied in the wet-scrubber circuit, where its reactive oxygen species attack hydrogen sulfide directly and convert sulfide to sulfate in the scrubber liquor. That leaves the scrubbing solution to be handled without the disposal burden a spent-media system creates.
How cost-effective is it?
Treatment came in at $0.0040 per pound of H₂S removed, making complete scrubbing of a heavily sour stream economical. That figure covers a Houston gas stream carrying 2,000 mg/L of hydrogen sulfide, which was completely eliminated. Because the sulfide is converted to inert sulfates rather than captured on spent media, the cost per pound is not followed by a separate hazardous-waste disposal charge.
