COMPARISON OF GLOBAL WARMING POTENTIAL-IMPACT ON THE HANDLING OF THE HAZARDOUS-SLUDGE FROM THE CENTRALIZED INDUSTRIAL-WASTEWATER TREATMENT PLANT

Abstract

Aims: This study was aimed to compare the secured landfill method and thermally sludge treatment through gasification, to find out the environmental impacts that will result from both treatments. Methodology and results: The study was carried out using the “gate-to-gate LCA method”. In its implementation, limits and assumptions have been determined as an approach to the actual condition. Some of the data used include the experimental data, theoretical mass balance calculation and secondary data obtained from previous research. The study was carried out utilizing the open-source openLCA software. The four-phase in the LCA include goal and scope definition, inventory analysis, impact assessment, and data interpretation. The simulation shows that the implementation of the thermal gasification process can reduce the emission released to the atmosphere by reducing hazardous sludge volume to be transported directly to the secured landfill. Conclusion, significance and impact study: Referring to the simulation results using openLCA software, with several assumptions and adjustments made, in the scope of the study that has been determined. It can be concluded that the thermal (gasification) treatment of hazardous sludge can be studied further in connection with its implementation at the treatment plant. It is indicated by the acquisition of global warming potential impact category of 673 kg CO2 eq (for direct disposal to secured landfill) reduced around 424 kg CO2 eq (for the implementation of thermal treatment). Or in other words, there is a reduction in the magnitude of the impact to around 37%.