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Case Studies for Alkaline Enhanced Odor Control in Municipal Sewage Collection Systems

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Odor control is an integral part of many wastewater collection and treatment systems. A novel method of odor control was implemented to achieve the following results:

1. Accelerate the removal of aqueous sulfide and prevent formation of aqueous sulfide in a gravity collection system.

2. Control odors in an 114,000 m3/day (30 mgd) gravity collection system and in another 130,000 m3/d (35 mgd) gravity collection system.

3. Reduce treatment chemical cost by as much as 12% with better performance in terms of sulfide removal as compared to nitrate independently.

Nitrate salts have been used independently to control odors in the U.S. for over 50 years. Introduction of a source of alkalinity to a wastewater collection system has been used independently to control odors in the U.S. for over 25 years. The new method involves liquid nitrate salts in combination with increased alkalinity to achieve improved economics, efficiency, and performance over either nitrate salts or alkalinity fed alone. In two applications addition of an alkaline material resulted in lower nitrate demand for odor control and sulfide prevention and removal (oxidation), and caused the biochemical reactions for oxidation of sulfide by nitrate to be accelerated.
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Keywords: alkaline; hydrogen sulfide; nitrate; odor; sulfide

Document Type: Research Article

Publication date: 2009-01-01

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