ENDUROX
Sulfide Control for Sewerage Collection Systems

Treatment of sulfide within collection systems is a difficult proposition. The organisms responsible for the production of sulfide are ubiquitous. They will grow within a collection system at any point where oxygen is limiting. Anaerobic or anoxic zones within a collection system create the perfect environment for the production of sulfide. Sulfide producing organisms harvest all oxygen molecules from oxygen rich sulfur compounds (e.g. sulfate, sulfite) commonly available within the wastewater for use in their metabolic processes. The resulting sulfide production causes significant odor issues and tremendous damage to infrastructure primarily from corrosion. Corrosion occurs as sulfide is converted to sulfuric acid by another class of organisms that use sulfide as an energy source.

A scientist by the name of R.D. Pomeroy was the first to identify the situation surrounding sulfide production within sewer systems. Pomeroy discovered that sulfide producers would not generate sulfide as long as oxygen and/or nitrate were present. This finding forms the basis for many control methods currently sold into the market for sulfide control.

Oxygen as a means of control is typically expensive and difficult to implement. It also has a significant draw back in that it will not provide for an oxygen rich environment in force mains with long retention times.

Nitrate as a basis of control can be very expensive, particularly in those situations where sulfide has already formed within the wastewater prior to nitrate addition. Under these circumstances, significant quantities of nitrate are necessary to induce organisms to consume sulfide. Nitrate seems to better serve for sulfide control as a deterrent to formation, not for sulfide control after it has already formed. Studies conducted using nitrate in those situations where sulfide was a pre-existing condition prior to the addition of nitrate indicate that costly amounts of the chemical are necessary to control sulfide.

The patent pending Endurox Process was developed to cost effectively destroy sulfide that is present at the delivery point while also providing a long lasting oxygen rich environment for long retention times within force mains and gravity sewer systems. The method also acts to kill those organisms responsible for sulfide production as a third benefit.

Control of sulfides within variable length and multiple line collection systems can be complex. Every system will be different. For this reason, four different blends of Endurox were developed in order to maximize control of sulfide with a primary goal of keeping costs under control. Endurox 10 provides treatment for relatively short runs from a lift station to a control point, while Endurox 11, 25 and 41 provide adequate treatment for variations in time and sulfide strength within collections systems from a few hours of retention time to in excess of 24 hours of retention time.

With proper set-up, the Endurox line of products will solve sulfide control issues effectively and economically. This is truly a break-through technology that can provide the control for sulfide that has been sorely needed within wastewater treatment. Please call Source Technologies at 859-223-1444 should you have any questions or to schedule a trial.

Endurox Material Safety Data Sheet (MSDS)