Rotten-egg odor is a telltale sign of the presence of hydrogen sulfide (H2
S) in your municipal wastewater system. It's also an indicator of damaging corrosion caused by sulfuric acid, an H2
S byproduct. Corroded pipes, manholes, and street collapses can all be caused by high levels of hydrogen sulfide in your wastewater collection system.
The Chemistry of Corrosion
Under acidic or turbulent conditions, hydrogen sulfide is released from wastewater in the form of gas. Some of the gas escapes into the atmosphere, causing the familiar unpleasant odor … and service requests from residents. There is also something just as damaging going on underground.
Thiobacillus bacteria in the wastewater system are oxidizing the hydrogen sulfide gas to form sulfuric acid that will corrode sewer pipes and weaken concrete structures, shortening the life of your wastewater treatment system and potentially setting it up for leaks and dangerous sewer collapses. This damage costs the nation billions of dollars in repairs and emergency services, according to a study by the U.S. EPA.
The good news is that, by updating your hydrogen sulfide treatment regimen, you can address both problems at once. You can eliminate odors and reduce or stop corrosion.
Leading-Edge H2S Treatment Solutions from Evoqua
Evoqua has the products, systems and expertise you need to protect the infrastructure of your wastewater treatment system. We can tailor a program for measuring, treating and remote monitoring your system to make sure you are using the right amount of treatment product - no more, no less - to prevent odors and maximize the life of your collection system.
|Bioxide® Biochemical Solution||When added to wastewater, non-hazardous Bioxide solution from Evoqua works to disrupt the sulfur cycle and prevent the formation of hydrogen sulfide.|
|ODOPHOS® Iron Salt Solution||Evoqua's ferrous sulfate solution product binds the hydrogen sulfide in a precipitation reaction that forms ferrous sulfide, which cannot form hydrogen sulfide gas.|
|Alkagen® Solution||Evoqua's controllable, rapid-dissolve, calcium-hydroxide-based pH shifting solution provides sulfide control within seconds from the application point.|
|VersaDose® Automated Dosing Controller||Evoqua's VersaDose® Automated Dosing Controller continuously delivers chemicals on a dose-to-demand curve that better matches real world conditions for optimal efficiency and effectiveness.|
|Link2Site® Remote Monitoring Solution||Evoqua's secure, Internet-enabled application for remotely monitoring data from hydrogen sulfide treatment levels in the field.|
Evoqua Study: Treat Hydrogen Sulfide to Eliminate Odors and Reduce Corrosion
Evoqua conducted an unprecedented two-year study that demonstrated how hydrogen sulfide treatment prevents corrosion in wastewater collection systems. In the study, two sites in the same collection system were chosen. At one site, hydrogen sulfide was treated as part of an odor control treatment program. At the other site, no treatment was provided. The results showed that the site with no treatment had a net loss in material of 5.4% and a reduction in compressive strength of 13%. The site with hydrogen sulfide treatment showed a net loss in material of 0.2% and no decrease in compressive strength. Treating hydrogen sulfide effectively reduced the formation of sulfuric acid and corrosion in the collection system.
from our technical article "A Novel Test Method for Measurement of MIC in a Wastewater Collection System."