Solving extreme hydrogen sulphide and odour issues in Southern California

Improving the Sustainability of Water Treatment

DOUG KELLEY \ September 6, 2019

El Centro, a city 100 miles east of San Diego, was experiencing significant issues with odor control in its sewer system, despite many different attempts from different chemical dosing suppliers to resolve the issue.

One particular sewer line, designed to serve the projected population growth around a shopping mall which has not yet eventuated, was too big for the relatively small volume sewer flow. Rotten egg gas (H2S) measurements at some man-holes in the system were exceeding 4000ppm, which is both highly dangerous as well as highly corrosive to the system.

The solution was to methodically dose Magnesium Hydroxide, its concentrated, stabilized suspension of magnesium hydroxide. Despite shipping the product to the US, the product remained stable and ready-to-use.

 

The City of El Centro said

“Magnesium Hydroxide technology has been applied successfully in our Sewer Line 3. The dangerous levels of H2S have been greatly reduced and we now have a safer sewer system. The success of this project lies of course in the product, but also equally in the high level of customer service, sincerity and professionalism practiced by all IER personnel”

 

 

After six weeks of dosing, there was a reduction in H2S levels to around 1,500 ppm, and after twelve weeks a significant flushing of fatty acids was noted, representing the break-up of “fat-bergs” in the system. Odor measurements after this event rapidly decreased to below 100ppm average, with instantaneous readings down to 3ppm.

Magnesium Hydroxide for Odor & corrosion control

Unlike other agents, which can be costly, potentially hazardous, and targeted at a single issue, Magnesium Hydroxide offers a safe and cost-effective strategy for managing odor.

Find out more

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Youssef Aaraj is a Process Engineer with experience in energy processes development & integration. Youssef has a PhD from the Ecole des Mines in Paris in Energy Processes Optimisation:
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