Akademik Veri Yönetim Sistemi
5th International Conference on Recycling and Reuse (R&R2024), İstanbul, Türkiye, 5 - 06 Temmuz 2024, cilt.1, ss.53-57, (Tam Metin Bildiri)
Inadequate infrastructure, principally due to unplanned industrialization and population growth, leads to pollution of water resources. Even if the contamination sources that cause water pollution are prevented over time, the sediment becomes a polluted and contributes to water pollution. Inevitable pollution can guide extreme conditions and reduce biodiversity in a water body. In some cases, reductions may also occur in the depths of water bodies, with streams feeding water sources and pollutants from the surface. In these situations, serious measures should be taken to prevent the loss of water mass. However, if these methods, which are applied to protect the environment and the integrity of the water body, are not appropriately applied, they can cause undesirable effects and cause more challenging problems. Therefore, a dredging project that is not implemented carefully will result in adverse environmental impacts. In this study, the environmental impacts of the dredging works applied to Golden Horn, Istanbul are evaluated to find out the best strategy. The dredging activities are performed both for pollution control and to prevent the Golden Horn from being completely filled. The study includes dredging works conducted between 2016-2020. Life cycle assessment (LCA) methodology is applied to find out the environmental impacts. The management status of the dredged materials, which were applied at the beginning of the dredging works in the Golden Horn, namely the sludge dams established in the quarries, and the dewatering of the dredged materials, which started to be applied later, and their disposal in the sanitary landfill facilities were examined. In addition, the effects of producing bricks with dredged material as an alternative method were investigated. In order to evaluate the environmental impacts of the dredging works, 1 m3 of dredged material is chosen as the functional unit. The system boundaries have been chosen to cover the extraction and transportation of the raw materials to be applied in each process, starting with the removal of the dredged material, its transportation, dewatering, removal and beneficial use. The GaBi software and CML2001 methodology are used to carry out the modelling. The impact categories under investigation are global warming (GWP), abiotic depletion-fossil (ADP fossil), abiotic depletion-elements (ADP elements), acidification (AP), eutrophication (EP), ozone depletion (ODP), human toxicity (HTP), freshwater aquatic eco-toxicity (FAETP) and marine aquatic eco-toxicity (MAETP) potentials. As a result of the life cycle assessment applied, it has been shown that the environmental impact of the disposal method in the sludge dams, which is the first method applied in the Golden Horn, is the most depending on the preparation of the removal area. As a result of the introduction of the landfill method, it has been concluded that although the applied methods require electricity consumption, it is more advantageous than the disposal case in sludge dams. Furthermore, the impacts of brick production with dredged material were compared with traditional clay brick production, and it was concluded that brick production with sediment was an advantageous method.