| Title | Removal of polycyclic aromatic hydrocarbons from leachates after autothermal thermophilic aerobic digestion using effective microorganisms |
|---|---|
| ID_Doc | 64847 |
| Authors | Wojciula, A; Boruszko, D; Malinowski, P |
| Title | Removal of polycyclic aromatic hydrocarbons from leachates after autothermal thermophilic aerobic digestion using effective microorganisms |
| Year | 2023 |
| Published | |
| Abstract | The autothermal thermophilic aerobic digestion (ATAD) method is increasingly used in Poland and around the world because it allows simultaneous stabilization and hygienization of sewage sludge. After stabilization, sludge is dewatered and then transported to biological systems. It has been proven that leachates after ATAD contain toxic polycyclic aromatic hydrocarbons (PAHs). In addition, their contact with other matrix components often results in the formation of toxic derivatives or forms with more rings. This situation results in a potential threat to the environment, as inferior quality wastewater may enter receiving waters. The scope of the study was to carry out treatment of leachate after ATAD using the activated sludge method in a model system, to which effective microorganisms (EM) was also added. The determination of PAHs in activated sludge, raw and treated leachates was carried out. The aim of the study was to determine the biosorption and removal efficiency of the different groups of PAHs. The greatest biosorption, as well as reduction in total PAHs, occurred in the research stages where EM were used. The addition of EM increased biosorption of 5-ring compounds by 61% and provided removal efficiencies of 81%-91% for this group of PAHs. The average removal efficiency of total PAHs from leachates after ATAD throughout the process ranged from 50% to 96%. The best result was obtained in the stage where EM were present for two weeks. |
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