Odor Control in Sewage Pipeline

NITRATE FOR ODOR AND CORROSION CONTROL

An information literature to explain the basics of H2S odor and corrosion and how nitrates perform as ‘prevention process”

BASICS

Although various organic and inorganic compounds can cause domestic wastewater

odors, hydrogen sulfide was most often identified as the predominant odor- and corrosion causing compound of concern

Typical Industries where there are Odour and Corrosion problem due to H2S are

• Municipal Waster Water / Sewage Treatment

• Oil Fields, Petrochemicals

• Paper and Pulp

• Public places like Hospitals, Hotels, Government Areas.

Hydrogen sulfide is often released into the gas phase when dissolved sulfide is present.

Sulfide is generated within the slime layer attached to sewer pipe walls because of anaerobic biofilm activity. The bacteria responsible primarily for sulfide formation, SRB “sulfate-reducing bacteria,” use sulfate (SO4-2) as their terminal electron acceptor, reducing it to sulfide (H2S, HS-,and S-2). The sulfide then diffuses through the biofilm to the bulk liquid phase. Once in the liquid stream, H2S can volatilize into the gas phase, where it can become an odor and potential corrosion problem. Figure is a schematic drawing of this process.

SO4 ---------( S Anaerobic Condition

S + 2H --------( H2S Causing Odor

H2S + 2O2 ---------( H2SO4 Causing Acid Corrosion[pic]

What are the Consequences of Not Treating Hydrogen Sulfide

• Worker Health and Safety

• Odor

• Corrosion and Destruction of Infrastructure

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OIL FIELD SCENARIO

Microbes are most abundant life form on this planet, no other life form approaches them in terms of numbers, diversity and habitat. Microbes have long history in Oil Fields. They not only live in extreme conditions, they also produce Hydrogen Sulfide H2S.

Souring,or increase in H2S, resulted from injection of sulfate rich sea water in oil...