Challenges to Accurate Estimation of Methane Emission from Septic Tanks with Long Emptying Intervals.

ABSTRACT: Septic tanks in low- and middle-income countries are often not emptied for a long time, potentially resulting in poor pollutant removal efficiency and increased greenhouse gas emissions, including methane (CH₄). We examined the impact of long emptying intervals (4.0-23 years) on the biochemical oxygen demand (BOD) removal efficiency of 15 blackwater septic tanks and the CH₄ emission rates of 23 blackwater septic tanks in Hanoi. The average BOD removal efficiency was 37% (-2-65%), and the average CH₄ emission rate was 10.9 (2.2-26.8) g/(cap·d). The emptying intervals were strongly negatively correlated with BOD removal efficiency (R = -0.676, p = 0.006) and positively correlated with CH₄ emission rates (R = 0.614, p = 0

SUBMITTER: Moonkawin J 

PROVIDER: S-EPMC10621000 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature