Articles
RSSTargeting Odor And Corrosion With Advanced "Dose-To-Demand" Technology
November 7, 2007
Click Here To Download:•Targeting Odor And Corrosion With Advanced "Dose-To-Demand" Technology
By Julie Ward,
Siemens Water Technologies,
and Hugh Logan,
South Bayside System Authority
Underneath our cities and towns span massive networks of pipes and pumps that transport sewage from our homes and businesses to regional wastewater treatment
facilities. Every day these networks expand as more homes and businesses are built and tied into sewer systems. Today, about 150 gallons of wastewater per household per day flow through sewage piping, all of which has the potential to generate offensive odors.
Untreated sewage generates multiple odor-causing compounds, but the most prevalent and most distinctive compound formed is hydrogen sulfide (H2S). Hydrogen sulfide has a distinctive rotten egg odor that can be detected at concentrations as small as 0.1 ppm (parts per million). The human recognition threshold is 4 ppb (parts per billion) to 5 ppb. H2S is also a health hazard. Concentrations of 100 ppm will numb the sense of smell, concentrations of 500 ppm may lead to pulmonary edema, and concentrations above 1,000 ppm can cause collapse and death in humans. In addition to being a health hazard, H2S is a corrosion hazard. The moist environment of the sewer system allows H2S to be oxidized to sulfuric acid, which can attack concrete, composite, and metallic pipes and structures in the system. Many systems that have gone untreated for long periods of time have undergone such severe corrosion that they experience premature failure.
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Click Here To Download:•Targeting Odor And Corrosion With Advanced "Dose-To-Demand" Technology
SOURCE: Siemens Water Technologies
