Filtration or sedimentation – An analysis of choice of technology for primary treatment Investigating surface area requirement, energy usage and climate footprint

Abstract

This study aims to investigate and to compare the conventional sedimentation method with a novel technology known as Drum Screening Liquid Filter (DSL) in the primary treatment step. The primary objective is to assess the viability of DSL as an alternative approach by examining factors such as surface area utilization, energy usage, and environmental impact. To determine the surface area requirements, a devised methodology based on the settling velocity of particles has been employed to calculate the dimensions of the sedimentation basins. Additionally, information and design methodologies pertaining to DSL filters have been sourced from HUBER wastewater technology. In order to evaluate the environmental implications, a comprehensive Life Cycle Assessment has been conducted. The findings of this research demonstrate that DSL filters offer favorable performance characteristics, particularly when addressing challenges related to limited surface area availability, energy efficiency, and environmental sustainability. The results confirm that DSL filters occupy a smaller surface area, consume less energy, and generate a reduced amount of CO2 emissions compared to conventional sedimentation methods, thus highlighting their potential as a promising alternative for wastewater treatment plants.