CHARACTERIZATION OF SUMMER GREENHOUSE GAS EMISSIONS FROM SEPTIC TANKS AND MEASUMENT OF CH<sub>4</sub> EMISSION FACTORS

XIA Qiongqiong; ZHENG Xingcan; GU Miao; LI Mai; SHANG Wei; TIAN Yongying; HUANG Haiwei; ONG Say Leong

doi:10.13205/j.hjgc.202409023

Volume 42 Issue 9

Sep. 2024

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XIA Qiongqiong, ZHENG Xingcan, GU Miao, LI Mai, SHANG Wei, TIAN Yongying, HUANG Haiwei, ONG Say Leong. CHARACTERIZATION OF SUMMER GREENHOUSE GAS EMISSIONS FROM SEPTIC TANKS AND MEASUMENT OF CH4 EMISSION FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(9): 240-246. doi: 10.13205/j.hjgc.202409023

Citation:

XIA Qiongqiong, ZHENG Xingcan, GU Miao, LI Mai, SHANG Wei, TIAN Yongying, HUANG Haiwei, ONG Say Leong. CHARACTERIZATION OF SUMMER GREENHOUSE GAS EMISSIONS FROM SEPTIC TANKS AND MEASUMENT OF CH₄ EMISSION FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(9): 240-246. doi: 10.13205/j.hjgc.202409023

Citation:

XIA Qiongqiong, ZHENG Xingcan, GU Miao, LI Mai, SHANG Wei, TIAN Yongying, HUANG Haiwei, ONG Say Leong. CHARACTERIZATION OF SUMMER GREENHOUSE GAS EMISSIONS FROM SEPTIC TANKS AND MEASUMENT OF CH₄ EMISSION FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(9): 240-246. doi: 10.13205/j.hjgc.202409023

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CHARACTERIZATION OF SUMMER GREENHOUSE GAS EMISSIONS FROM SEPTIC TANKS AND MEASUMENT OF CH₄ EMISSION FACTORS

doi: 10.13205/j.hjgc.202409023

1. North China Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300074, China;
2. Center of Science and Technology & Industrialization Development, Ministry of Housing and Urban-Rural Development, Beijing 100835, China;
3. Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore

Received Date: 2024-08-08
Available Online: 2024-12-02

Abstract

Abstract

Septic tanks are the main source of greenhouse gas emissions from urban fecal and sewage systems, but the emission characteristics of greenhouse gases from septic tanks are still poorly understood, and carbon emission accounting lacks basic parameters. Summer is the prime season for GHG emissions from septic tanks. In this study, the anaerobic degradation process of actual domestic wastewater from septic tanks in summer in a community in North China was simulated through experiments to investigate the GHG emission characteristics and influencing factors, and the CH₄ emission factor of septic tanks in this community was measured. The results showed that the removal rates of COD and VFA in the simulated septic tank were 53.4% to 76.9%, and 13.6% to 24.9%, respectively, when the water temperature was 25 to 28 ℃, and its CH₄ and CO₂ emission intensities were 3.1 to 8.1 mg/L and 10.3 to 16.7 mg/L, respectively. The removal of COD by septic tanks increased with the increase of sediment mass in the septic tanks, the decrease of influent flow and the increase of water temperature, and CH₄ emission intensity showed the same trends. However, the sediment mass and influent flow had less influence on CO₂ emission intensity from the septic tank, but CO₂ emission intensity increased significantly when the water temperature increased. CH₄ emitted from the septic tank mainly existed in the headspace of the reactor. While CO₂ was mainly dissolved in the liquid and discharged with the effluent. The CH₄ production by the septic tanks to remove 1 kg of COD was 0.103 kg and 0.077 kg, respectively under the conditions of 28 ℃ and 25 ℃, and the amount of CH₄ discharged was 0.029 kg and 0.021 kg, respectively, and the average CH₄ production rates were 12.36 g CH₄/(cap·d) and 9.24 g CH₄/(cap·d), respectively.
- septic tanks,
- greenhouse gases,
- sediment,
- emission characterization,
- CH₄ emission factors

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References(27)

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