What Causes Odor in Wastewater Treatment Facilities? finding and solving any odor problem can be tricky, but the first step is to identify the source. Unpleasant smells in a wastewater treatment facility can come from raw wastewater being exposed to air at the pump station, the primary clarifier, or any other stage of the treatment process.
Here are the main causes of bad odors and how to address them.
Rising Temperatures
Warm weather conditions can present a challenge for wastewater treatment. As temperatures rise during hotter months, the temperature of the wastewater also increases. This makes aerobic bacteria hyperactive, causing them to digest Biological Oxygen Demand (BOD) and other nutrients at an accelerated rate. The result is low dissolved oxygen levels, which can lead to foul smells.
Anoxic Zones
The term “anoxic” refers to biological denitrification-a process where bacteria use nitrate instead of oxygen as an electron acceptor. If wastewater has high levels of nitrate and nitrite, an efficient treatment process is needed to break down odor-causing compounds. Without this, nutrient pollution can occur when the treated water (effluent) is discharged into the environment.
Anaerobic Decomposition
During anaerobic wastewater treatment, microorganisms break down waste in the absence of oxygen. A natural by-product of this process is hydrogen sulfide (H₂S), a compound that emits a strong, offensive “rotten egg” smell. Because H₂S has low solubility in wastewater, it is easily released into the air.
Treatment deficiencies are the primary cause of these issues, which negatively affect both staff and surrounding communities.
Solutions to Wastewater Odor
Increase Oxygen Supply
Increasing the oxygen supply ensures that aerobic bacteria have what they need to digest BOD without producing unpleasant odors.
Improve Wastewater Circulation
Conventional aeration technologies are not always effective at increasing oxygen supply and ensuring proper circulation. While coarse and fine bubble diffusers can improve dissolved oxygen levels, newer technologies offer superior performance. The Membrane Aerated Biofilm Reactor (MABR), for example, provides a revolutionary improvement in aerobic wastewater treatment by efficiently delivering oxygen and ensuring high-quality effluent.
Effectively treating municipal wastewater with a modern solution like MABR protects the environment from pollution and eliminates odor issues.
MEB provides specialized services to help you design, supply, and maintain the best treatment option for your unique challenges. Contact us today to learn more about our packaged biological wastewater treatment solutions.
