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Itâs springtime in Montana. So far, the annual eau de printemps from Belgradeâs sewage treatment lagoons is not wafting on the breeze.
City officials have their fingers crossed that when the annual aroma does emerge, it wonât last as long as it did last year, thanks to the recent installation of aerators in the sewer systemâs treatment lagoons.
The odiferous phenomenon occurs during the natural turnover process that begins when weather starts to warm. Anaerobic materials at the bottom of the lagoon ponds rise to the top, and associated gases are released into the atmosphere. At the same time, the water at the top of the ponds, which contains aerobic materials and serves as a water cap to the bottom layer, is displaced to the bottom. During about a month-long process for the oxygen-dependent biological treatment processes to recover and equalize, foul odors are released.