Why was the fetid smell generated in León? Specialist explains the cause

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Lion.- The fetid smell that the Leonese registered this Wednesday afternoon is about methane gas originated by a natural phenomenon that will prevail for a few days until the process ends, reported Jose Lopez, environmental consultant from Guanajuato.

In an interview, he explained that the phenomenon was derived from drastic change in weather —We are already leaving summer, we are in the fullness of autumn and we already have winter on our doorstep, José points out—, which caused the explosion of bacteria in the drainage with the change in temperature and its corresponding organic decomposition.

Read the phenomenon: Without breathing: Bad smells flood the streets of León

“The change in temperature enters the drains and there is an organic decomposition that generates putrid odors”, explained the environmental specialist.

The odors that will prevail in the environment are similar to sulfur, and those generated by putrefaction – like a rotten egg. The current fetid environment is also a result of the abundant rainy seasonsays Jose, who registered with the state last season.

“We had streams flowing, dams full and right now, the level of the streams has already dropped a lot; some are already drying up. On the other hand, the dams are also lowering their level because they begin to have vents in order to be able to have them at an acceptable capacity in terms of safety. When we do this, what happens? All the weeds that were generated, everything that is the biofilter – which is made when the water rises based on bacteria – is exposed when the water goes down “, José details.

And so the stench begins

When the biofilter is exposed without a layer of water to protect it, the decomposition process which also generates fetid odors, coupled with the natural wind currents that dissipate them throughout the city.

“Odors are nothing more than methane gas, decomposing organic matter,” says López.

The specialist explains that the areas that register the most bad odors are those near dams, rivers, streams, especially in the north and south of the city, without forgetting the large rainwater collectors, such as those located on the Francisco Villa, Timoteo Lozano and JJ Torres Landa boulevards.

“The main hydraulic part of the city is the one that will be affected the most. We have two areas that are sub-basins: to the north is the Lerma-Chapala basin, which drifts into the sub-basin that comes from the Sierra de Lobos streams and ends in the Presa del Palote basin; and on the south side, we have the Turbio river that rises through Irapuato and Salamanca and that, when passing through León, lowers its level and all the organic matter that begins to decompose is exposed ”.

To mitigate the impact of organic decomposition gases in the environment, which add to the greenhouse effect, the environmental specialist recommends check the vehicles to lower the emission of pollutants. Regarding health, it invites you to take precautionary measures since the season is susceptible to respiratory diseases.

What SAPAL investigated

On the morning of this Thursday, the León Potable Water and Sewerage System (SAPAL) assigned an investigation cell to find the origin of the bad odors in the sewage system. The sanitary network that was reviewed corresponds to that of the colonies: Obregón, San José el Alto, Rinconada del Sur, San Pedro Plus, Jardines de San Sebastián and Fraccionamiento Guadalupe.

After 1 pm, SAPAL informed Correo the diagnosis of the study, in which they point out that no anomalies were found in the infrastructure or in the wastewater in the areas.

“SAPAL reviews the health network with an explosimeter, a tool that measures and detects the presence of dangerous gases. For the tranquility of the people of León, SAPAL will continue with these reviews during the day and has implemented teams to immediately attend to any report that may arise ”, informed Mail.

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