In August of this year, the National Public Health Care Laboratory (NVSPL) conducted odor concentration measurements at the Dumpiai regional landfill. In 2021, at the nearest residential environment from the territory of KRATC, there was a fixed dispersion of up to 3 odor units (OUE/m3)while recent measurements showed only up to 0.7 OUE/m3. A person can smell at 1 OUE/m3so it is obvious that the aromas of Dumpia landfill do not even reach the nearest settlements, not to mention the city of Klaipėda, which is several kilometers away.
The intensity of odors decreases
This is already the third measurement of the concentration of odors carried out by NVSPL at Dumpiai landfill. Since 2018, when the first measurements were made, the odor intensity has never exceeded the permissible 8 OUE/m3 and systematically decreases. in 2018 dispersion of up to 5 odor units was recorded at the border of the landfill, in 2020 it decreased to 4 OUE/m3, 2022 indicators are even lower – 2.1 OUE/year3.
According to KRATC representatives, there can be at least several reasons for the decrease in odors. The company’s installed and continuously improved air cleaning and odor neutralization products have an impact. The reclamation of sections 1 and 2 of the landfill is underway – since 2008, the waste deposited on the mountain has been conserved under a thick layer of soil, with the installation of a gas collection system, so this part also no longer emits intense smells. Another reason is that the residents of the region started sorting better, so less and less municipal waste is brought to Dumpius every year. Less waste means less decay and less smell.
Innovation – covered containers
The most intensive spread of odors in the territory of the landfill was and is recorded at the site where waste prepared for removal to the incineration plant is stored in containers for several hours.
Unrecyclable waste, which is full of food residues and other biodegradable materials, is loaded into these containers from the sorting facilities. They attract birds like a magnet and emit fumes of decaying waste into the environment.
“All brought municipal waste is immediately sprayed with a substance that destroys putrefactive bacteria in the reception room as soon as it is unloaded from the truck. When the waste is stored and sorted in closed workshops, the odors are caught by the biofilter and neutralized by probiotics and AirBorn preparations sprayed on the conveyors”, explained Tomas Kuprys, head of the sorting department. However, neutralizing agents do not work as effectively outdoors.
In order to reduce odors in this part of the territory, two solutions were proposed: to build a closed hangar with an autonomous air purification system or to purchase covered containers. The technologically faster and economically more attractive means was chosen – containers with retractable awnings.
The first covered containers are already used for waste storage, whether they will have the desired effect of further reducing the spread of odors will be known during further research. By the way, covered containers have already proven their advantage – the waste in them has become inaccessible to birds.
The reduction of odors from Dumpiai landfill is also likely in the future. It is associated with a food sorting project starting next year.
According to the environmental impact study, once residents start sorting food waste, the spread of odors in Dumpiai landfill will decrease by another 12-14 percent.
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