Here's the scenario: You have:
Fortunately, there are several proven techniques for separating H2S from a gas stream. What might be surprising is that the unit cost of H2S removal (i.e. the cost/lb of H2S removed) can vary profoundly between those available technologies. Here's a summary (with notes that affect cost of ownership):
Bottom line? With 2000scfm and 1000ppmv H2S reduced to 25ppmv, the difference in media cost alone is more than $312,000 annually:
Of course, no single technology is best for all applications. And they're not mutually exclusive, either: For example, a dedicated, low-cost means for H2S control may make sense ahead of activated carbon if there are other contaminants (like siloxane) that must be removed as well.
Please contact us, and we'll help with your analysis to determine which approach represents your most cost efficient option.
Tables courtesy of MV Technologies, Inc.on for H2S is available; however annual costs increase dramatically for inlet concentrations greater than 200ppm.
2) Includes costs of nutrients and estimated labor for active system control.
3) MVNet™ systems provide for media changeout without confined space entry.
4) Media sets up "solid" if run to full life, making removal very difficult - often requires hydroblasting.
5) Vacuum truck removal is typical.
6) Active bacteria is sensitive to temperature, nutrients, pH and other environmental conditions. Systems may require up to 10 days to start and stabilize after shutdown for maintenance. Fluctuating H2S concentrations pose operating problems. If H2S "spikes," and the bacterial action may not respond quickly enough to maintain required outlet concentration. If inlet H2S is too low, bacteria population can "starve" and reduce effectiveness. Sulfur bearing effluent must be handled/managed and may pose additional water treatment considerations.
The tables applies mainly to applications that involve up to 300 lbs/day of H2S removed. Other well-known technologies may be appropriate for H2S removal for much larger flow rates. These include: caustic scrubbing; caustic scrubbing with biological conversion of the H2S; and iron based liquid "redox."
George Voss is a Partner with TransEnergy LLC and Founder/President of Sustainability Business Management. George, a sustainability, distributed energy, & environmental expert, an innovative leader and entrepreneur, offering his expertise to help manufacturers, reps and distributors better understand customer benefits associated with their products/services and realize growth objectives.