H2SPlus^TM Systems

Application

MV’s H2SPlus™ Systems are in use treating biogas streams from landfills to anaerobic digesters at farms, wastewater treatment facilities and food & beverage processing operations. MV’s systems treat 30,000 cubic feet of biogas and landfill gas/min., every day and provide low cost solutions to H₂S management in natural gas production and oil refining operations.

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Design

H2SPlus Systems are designed to remove low to moderate concentrations of hydrogen sulfide (H₂S) and mercaptans from gas and air streams. In addition to the removal of sulfur-containing products, the system also will remove certain biodegradable, volatile, and semi-volatile hydrocarbon odors, together with amine odors.

The basic H2SPlus System is a result of over ten years of in-field application and each component is sized to meet site-specific requirements. Systems can be easily configured to adjust to future changes (+/-) in process operating parameters.

Key components of an H2SPlus system are:

• Media Vessel(s) – Fiberglass or stainless steel tanks sized to accommodate flow rate and maximize media life.
• MVNets™ and Fully Removable Lid – Provide dramatically easier removal of spent media when compared to other H₂S removal systems.
• BioActive Media – Proprietary enhancement for removal up to 13lbs of H₂S per cubic foot.
• Recirculation System – sized to maintain optimal moisture content of the media.
• Blower – sized according to system parameters.
• Spray Nozzle – positioned inside top of lid to keep media moist.
• Sump – used to recirculate minimal amount of water required for regeneration and maintains moisture.
• Monitoring and Control System – system monitoring of temperature, sump pump, and blower controls.

Fundamental Design Considerations

There are standard inputs required to properly size an MV H2SPlus™ system:

1. Typical flow rates, both maximum and average
2. Inlet concentration of H₂S in the ‘raw’ gas stream
3. Target (treated) H₂S concentration level at the outlet of the scrubber
4. Pressure (psi) – If the system is operated under pressure/vacuum.
5. The source of the gas / industry
6. The main reason for treating the gas
7. The end-use for the gas
8. Geographic location

The flow rate information determines the size and number of media tanks required. Geographic location determines if the tanks need to be insulated. The concentration determines the media consumption rate and informs other elements on the design of the system. The combination of the flow rate and the concentration yields the weight of H₂S to be removed per unit time. You can estimate your annual H₂S treatment requirements and media consumption cost here.

We also need to know the intended use of the gas after it has been scrubbed. If it is intended for pipeline application or other uses that demand strict controls over concentrations, those will influence the system design as well. Media life between replacement cycles is calculated based on the H₂S concentration, total flow rates, and specific system design.

The final design selection is often a trade-off between system footprint limitations and target media change cycle time.

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Technology

MV’s core technology is its H2SPlus™ Systems – a proven “dry scrubber” (aka., dry chemical (absorbent) scrubber technology combined with a superior system design – informed by over ten years of in-field application to ensure maximum performance, safety and cost-effectiveness.

The H2SPlus™ System approach to dry-scrubbing uses long-proven, low-cost iron oxide coated media (iron sponge) that MV Technologies has enriched with select bacteria and complemented with a system designed to extend media life and dramatically increase ease of system use. Iron sponge has been used to remove H₂S from gas streams for more than 100 years and the media is comprised of wood chips coated with iron hydroxide.

H2SPlus Systems are currently in use throughout the U.S. treating a variety of gas streams to remove H₂S & mercaptans and reduce SO₂.

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How It Works

The H2SPlus System design is relatively simple in design yet elegantly efficient in effect. Landfill gas or biogas is flowed through the vessel inlet valve (top). The H₂S present in the gas flows down through the media bed, neutralized via the reaction with MV’s bio-active media, and the ‘scrubbed / treated’ gas is then released through the outlet valve (bottom). H2SPlus™ Dry Scrubber System Reaction Process. There are two chemical reactions that take place in vessel:

1. In the primary reaction, H₂S in the inlet gas stream reacts with the iron oxide (Fe_xO_y) in the media to form iron-sulfur compounds (Fe_xO_y), free sulfur and water.
2. Oxygen present in the gas stream further reacts with the iron-sulfur compound liberating the sulfur and re-forming the iron oxide, making it available once again for the primary reaction.

These regeneration reactions require oxygen which may naturally be present in the gas stream or (a small amount) can be added by air injection at the scrubber. In the event that outlet gas conditions do not accommodate air addition, the secondary regenerative reactions can be performed “off-line” by taking the vessel out of active service.

Additionally, H2SPlus systems:

• work anaerobically; with a very small amount of Oxygen to facilitate the reaction process.
• do not require high pressure in order to operate like some other systems. This results in lower horsepower/electrical requirement.
• economical sweet spot is between -2 to 8 psi. However, MV Technologies can design systems to operate at any pressure range. We would simple use our biologically-enhance granular media and adjust vessel size/type for psi 15 and above.
• operates with no need for a water treatment system or sewer line access.
• can be installed on either the ‘vacuum’ or ‘pressure’ side.

NOTE: it is advantageous to install H2SPlus on the ‘vacuum side’ when possible since such a design may offer potential total system performance advantages such as protecting more system components from H₂S exposure, reducing total system horsepower consumption and possibly reducing capacity requirement on other system elements.

Predictable & Consistent Performance. Guaranteed.

MV applies the best available technology to clients’ site specific conditions in order to deliver H₂S removal systems at the lowest total cost of ownership with a performance guarantee to meet target outlet concentration.

H2SPlus Systems are Performance-Based.

• Operated at 100% effectiveness immediately upon startup.
• NOT susceptible to fluctuating gas conditions.
• Removes 13 lbs. of H₂S per cubic foot of media.

H2SPlus Systems are guaranteed to meet target outlet concentrations, regardless of seasonal variations / fluctuations of H₂S inlet ppmv. An increase in H₂S concentration only affects the rate at which the media is consumed and not the performance of the system. And, at $1.31 per pound of neutralized H₂S -- our enhanced iron sponge media, coupled with our engineered systems, provides the most economical dry scrubber in-market.

 

Importantly and unlike biological scrubbers, an H2SPlus Systems will absorb large fluctuations of incoming H₂S concentrations, and continue to deliver the designed outlet condition without deviation. Therefore, if your project has a “bright-line limit” on H₂S or SO₂ concentrations, there is no need to worry about whether changes in feedstock, water conditions, or any other incoming variable will put you out of compliance when using the H2SPlus System.

B.A.M.^(TM)

Additionally, it is important to point out that MV modifies commercially available iron sponge and markets it as B.A.M. (bio-active media). MV purchases standard grade iron sponge product from a commodity supplier, and enhances that material with biological agents to produce a more reactive and effective media. The iron hydroxide in the B.A.M., neutralizes the H₂S by converting it into iron sulfide compounds through chemical reaction, and the bacteria serve to “refresh” the available reactant. MV’s addition of biological agents to media result in removal of numerous non-sulfur bearing species such as VOC’s and readily biodegradable organic compounds, and improved re-oxidation of the iron sulfide compounds (troilite and pyrite) to regenerate iron oxides for subsequent reactions. All of this adds up to extended life of the reactive media and lower cost of operation.

Note: MV does not sell B.A.M. for application in other dry scrubber equipment installations. The total performance that we secure from our media is in part driven by the specific engineering elements of the H2SPlus system design and it is the combination of the two that enable MV to offer its MV Performance Guarantee.

The MV Technologies Difference

What sets H2SPlus Systems apart from other systems is the combination of biologically enhanced media with a proven system design, informed by over ten years of in-field application.

H2SPlus Systems offer:

• Flexibility & Scalability
• Consistency of Performance
• Lowest Total Cost of Operation

The key operating advantages of H2SPlus Systems are:

• Extended media life
• Minimal operator attention
• Reduced operating expense
• Dramatically increased ease of system use; and
• Infrequent, predictable, efficient and safe media change outs. Watch media changeout video ^*

At end of life, MV’s media:

• is non-hazardous
• passes the Environmental Protection Agency’s T.C.L.P test and meets O.S.H.A. definitions of a “not readily ignitable solid”
• can be composted, land-applied, or disposed of in landfills.

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