The impact of solids retention time on Greenhouse Gases Emissions from biological wastewater treatment processes

Abstract Biological wastewater treatment is linked to direct and indirect greenhouse gases (GHGs) emissions, thus new approaches on design operation of plants (WWTPs) must be adopted aiming towards GHGs emissions’ mitigation. This study evaluates the impact solids retention time (SRT) (CO 2 N O) emissions activated sludge (AS) processes with nutrients removal operating at 10, 30 180 days SRT. The SRT represents complete AS process (CRAS), which introduces a novel WWTP approach for excess reduction. evaluation performance via ASDM model Bridle methodology showed that total O increased together increasing dissolved oxygen CRAS achieved 97,4% 96,2% reduction compared 10 d respectively, in being respectively higher by 20,0% 12,2%. lower compensate emissions. At high influent loads, balance tilts favour due management quantities, rendering more sustainable choice.