SUL-FREE™: HYDROGEN SULFIDE SCAVENGER

Sul-free™ products are a new group of organo-imino compounds that offer significant advantages for treatment of

Hydrogen Sulfide. Its chemistry specifically targets Hydrogen Sulfide, organo-sulfur compounds, and mercaptans.

This unique new chemistry is synergistic with wastewater systems, bacteria, and enzymes. In field wastewater

applications Sul-free™ WS 1500 quickly and specifically binds up sulfur. This includes stripping sulfur from the

poisoned aerobic bacteria and enzymes that are beneficial and have been deactivated by the sulfur bond. This

reaction has shown the benefit of a natural increase of O2 that in turn optimizes the bio-chemical balance of the

system. Sul-free™ does its job and frees the bacteria to do theirs. Its pleasant, safe aroma eliminates foul odors

while it reacts with the Hydrogen Sulfide and mercaptans. They are removed indefinitely from the solution.

Sul-free™ has no negative impact on downstream operations. The chemistry biodegrades completely in normal

wastewater treatment processes without loading solids into the system. Sul-free™ is a breakthrough in economic

treatment of wastewater. Low chemical addition rates and catalytic regeneration of the Sul-free™ molecules mean

that it can be the lowest costing Sulfide scavenger; cheaper than any treatment on the market. There is no need

for special pumps, tanks, or chemical resistant piping. Sul-free™ is the lowest costing treatment on the market,

however efficiency is its greatest asset. Sul-free™ demonstrates low toxicity. It is not corrosive to concrete, steel

or plastic, and requires no scrubbers. Sul-free™ can be diluted to fogging levels (between 1 and 3000 ppm), safely

removing poisonous and corrosion-causing Hydrogen Sulfide, mercaptans, and foul from various locations. It can

be fogged above tanks, settling ponds, sludge dewatering areas, lift stations, air gaps, manholes, and culverts.

Sul-free™ OS products are the oil soluble scavengers for the petroleum, refining, and natural gas industries. These

scavengers are application driven to remove sulfur odors from sour fuels and lubricating fluids and to reduce

corrosion in transmission lines. High solubility along with high Sulfide bonding capacity per molecule allow

effective removal of Hydrogen Sulfide and mercaptans without introducing water into an oil based system. Oil and

fuel solubility prevents off gassing of sulfur odors, while the ashless molecule burns like diesel fuel. Sul-free™ is

truly a step forward in Hydrogen Sulfide scavenging technology. It is a product that is reaction specific and without

toxic consequences. Truly a product that is useful to many industries, including wastewater treatment and

petrochemical refining, Sul-free™ removes foul smelling sulfurous chemicals from systems and from the

atmosphere.

Until today, Hydrogen Sulfide treatments generated many disadvantages…

-Special scrubbers needed for Chlorine- required by OSHA

-Creation of Sludge

-Creation of Scale

-Generation of Acid in process

-Generation of Nitrates

-Special handling procedures and training required

-Short lifespan of chemical interaction

-Inability to deal with spikes due to temperature or loading factors

-Loss of chemical effectiveness before reaction with sulfides

-Corrosive, oxidizing, and poisonous chemical hazards

-Chemical additives require special equipment (tanks, pumps, and specialized piping)

-Chlorine, Hydrogen Peroxide and Nitrates as oxidizers are bio-interrupters, inhibiting and killing beneficial

bacteria, and interrupting the system function

-Chlorine has a short lifetime in wastewater, consumed by everything in the wastewater

Advantages of using Sul-free™…

+Requires low additional chemical

+Degrades in anaerobic conditions to Methane, CO2, and H2O

+Does not require special handling+Does not have a short lifespan

+Does not generate sludge (not a precipitator)

+Does not cloud water

+Does not generate scale

+Decreases corrosion

+No negative downstream effects

+No specialized scrubbers, tanks, pumps or mixing stations

+Not an acid

+Not an oxidizer

+Not quickly consumed by wastewater+Not volatile, so it stays in aerobic solutions+Not a gas+Not regulated+Lower Cost

Diagram of Sul-free™ Anaerobic Degradation

Diagram of Sul-free™ Molecular Substitution

from Aerobic Oxidation. Bi-product is a cycle of

the Sul-free™ molecule regenerating itself.

Water Soluble Line Data Sheet (Sul-free WS1500, 1530, 1560, 1585)

Oil Soluble Line Data Sheet (Sul-free OS6000, 6100, 6685)

Click to Download a Sul-free™ Powerpoint

Perform your own Jar Test. Click the link and follow the bench test instructions.

Testimonials:

Please be advised that the Sulfree™ product Guard has been supplying RTW is working great. We no longer

smell any of the “rotten egg” smell coming from our wash tanks. Just small additions of the Sulfree™ keep the

tanks from smelling offensive and create a more pleasant work environment. From all the employees at RTW,

please except our thanks in solving this odorous dilemma.

Jim Goehring, Manager

Roll Technology West

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I will definetly will be ordering a barrel of the Sulfree™ 1530 in early spring when the air and liquids start heating

up. The sulfree takes the pungency out of the liqids which is the offensive odor , you can still tell it’s cow manure

but the neighbors are no longer shooting at us. Bear in mind that’s using half a gallon a day with 350 milk cows ,

as you have no charts or directions it’s a by guess or by golly system that is being used for now. I’m hoping to be

able to cut that rate down some. We sell our solids to a soil products company that composts it and mixes it with

barkdust and fertilizers to make soil amendments.

Heike Fry

Sul-free™ vs Nitrates

Sodium Nitrate & Calcium Nitrate negative:

1. Adds Nitrates to Wastewater

2. Nitrates regulated in wastewater—by 2010 wastewater must be below 10 ppm in discharge

3. Nitrates are pervasive and persistent chemicals

4. Nitrates may or may not be used as an oxygen source for bacteria

5. High addition rates—recommended at 10 ppm

6. Expensive compared to Ferric Chloride

7. Not a viable chemical oxidizer

8. Used primarily to lower gaseous Hydrogen Sulfide in lift stations

9. States in literature that it does not chemically remove Hydrogen Sulfide

10. Not an antidote for Hydrogen Sulfide poisoning of bacteria

11. Not normally used in general treatment process

12. Does not claim to remove odors, only to assist biological processes to remove odors

13. Site specific odor reduction

14. Not used alone in treatment processes—basically because of the cost, the treatment rate,

and the nitrate contamination level.

15. Generally unsure of effectiveness overall.

16. Non-regulated

17. Safety compared to others

18. Source of oxygen in anaerobic systems—good in aerobic digestion, bad for anaerobic digestors.

19. Raises pH of wastewater

Comparison to Sul-free™:

1. Contains no Nitrates

2. Biodegrades in anaerobic digestors over time

3. Not an oxidizer, but increases dissolved oxygen levels in aerobic digestors

4. Sul-free™ does not kill bacteria, though it may enhance aerobic bacteria

5. Produces no sludge, and no residue

6. Low addition rates—one customer uses 2 gal Sul-free™ instead of 100+ gallons Bioxide

7. Sul-free™ is cheaper than Bioxide treatment

8. Sul-free™ can be used in lift stations, in ponds, in aerobic and anaerobic digestore, at the headworks,

and in chemical scrubbers.

9. Sul-free™ can also be atomized for treatment of headspace

10. Chemically reacts with Hydrogen Sulfide and Sulfur compounds

11. Can be used as both a treatment for lift stations and for general odor removal

12. Sul-free™ can eliminate other odors such as mercaptans, ammonia, and general stinkiness

13. Sul-free™ is very effective and quick—odor reduction results in 15 minutes or less

14. Non-regulated

15. As safe or safer than nitrates.

16. Low addition rates mean lower costs and lesser environmental issues

17. Raises pH of wastewater

Sul-free™ vs Chlorine

Chlorine and Hypochlorite negative:

1. Dry Chlorine requires special handling equipment

2. Specialized Tanks and Permitting required

3. Specialized scrubbers required by OSHA for every addition point

4. Specialized safety protocols and chemical gear

5. Addition points limited to delivery equipment and danger

6. Cheap chemical, with expensive equipment and great danger

7. Active for minutes to about 4 hours.

8. Chlorine lowers the pH of wastewater.

9. Aerobic Digestors blow Chlorine out of the solution often rendering it ineffective at controlling odors. The only

answer is adding more and more Chlorine—a never ending cycle.

10. Being a gas dissolved in water it has limited ability to fight waterbourne odors

11. Kills friendly bacteria

12. Reacts with everything

13. Adds to the Electric Conductivity of wastewater (EC factor)

14. Non-specific chemical requiring large excesses to treat odors and wastes

15. Hypochorite and Chlorine react producing acid in the oxidation process. Hydrogen

16. Can oxidize organic nitrogen molecules all the way to nitrates

By Comparison to Sul-free™:

1. No special handling equipment—rather, Sul-free™ eliminates the need for it.

2. No special tanks —low addition rates mean that drums replace tanks

3. No special permitting

4. No scrubbing sytems required

5. Safety protocols—only general safety like wearing gloves and goggles

6. Addition points not limited by expensive equipment, can be dispensed anywhere

in the system

7. Cheaper than Bleach—with no danger

8. Active for hours to days

9. Increases pH of wastewater—increasing the solubility of Hydrogen Sulfide while it reacts

10. Effective in aerobic digestors—aerosol of product scrubs the air above the liquid. Heavy vapor covers the

solution of aerobic digestors and ponds

11. Sul-free™ can act on air, water or even solids, removing odors safely

12. Sul-free™ at use concentrations does not kill bacteria

13. Reacts specifically with odor chemicals and sulfur compounds

14. Adds no Electrical Conductivity (EC) to water

15. Chemical specific molecules lead to low addition rates—better for the environment

Sul-free™ vs Ferric Chloride

Ferric Chloride negatives:

1. It is an acid adding to wastewater that holds more Hydrogen Sulfide when it is base.

2. It adds Chloride and Electrical Conductivity to any wastewater that is treated with it, meaning all wastewater

has more salts in it. For municipalities that reuse water or inject it into groundwater, this means more saltiness to

the water.

3. Ferric Chloride adds ten percent or more to the weight of sludges.

4. Large quantities must be added to accomplish the goal of Sulfide reduction.

5. Peroxide must be added as well, doubling the cost, or the wastewater turns to mud for the amount necessary.

6. Ferric ion reduction by Ferrous Sulfide and Sulfur contribute to poorer sludge flocs and therefore more sludge,

less density and more water in the sludge.

7. More difficult to de-water sludges.

8. Adds color to water and sludge.

9. No capacity in case of higher loading factor. Any increase in Sulfide concentration cannot be adjusted by

additions of more Ferric Chloride partly because you are already adding so much.

10. Hazardous Material –corrosive—classified as an acid.

11. Requires large tanks and specialized handling because it requires large volumes.

12. Limited points of addition of product, because of large volumes needed and limited acesses for materials.

13. Sludging of waste lines.

14. Large addition rates—40mg/l compared to 2-3mg/l Sulfree

15. Stains concrete, plastic and metal.

16. Cannot be sprayed or misted.

17. Causes Corrosion of pipes and equipment

By comparison with Sul-free™:

1. On the base side, instead of adding acid—better for Hydrogen Sulfide control.

2. Sul-free produces no Electrical Conductivity (EC) to downstream wastewater.

3. Sul-free contributes no sludge volume.

4. Low addition rates—5 gallons compared to 120 gallons.

5. Sul-free encourages denser flocks.

6. At use levels, adds no color to the wastewater and no turbidity.

7. Extra capacity in case of higher loading capacity. Can even work catalytically in aerobic systems, allowing

removal rates at up to 40 molecules per molecule.

8. No Hazard class. Safe and not regulated.

9. Low addition rates mean small footprint for equipment.

10. Sul-free can be added at any point in the system.

11. Decreases Corrosion.

12. Can be safely sprayed at low concentration to control gaseous emission due to splash transfer and turbulent

flow