当前位置: X-MOL 学术Environ. Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Greenhouse Gas Emissions from Blackwater Septic Systems
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2021-01-06 , DOI: 10.1021/acs.est.0c03418
Loi Tan Huynh 1 , Hidenori Harada 2 , Shigeo Fujii 3 , Lien Pham Hong Nguyen 4 , Thu-Huong Thi Hoang 4 , Hai Trung Huynh 4
Affiliation  

Septic systems are potentially a significant source of greenhouse gases (GHGs). The present study investigated GHGs from the blackwater septic systems that are widely used especially in low- and middle-income countries. Ten blackwater septic tanks in Hanoi, Vietnam, were investigated using the floating chamber method. The average methane and carbon dioxide emission rates measured at the first compartment (65% of total capacity) of the septic tanks were 11.92 and 20.24 g/cap/day, respectively, whereas nitrous oxide emission was negligible. Methane emission rate was significantly correlated with septage oxidation–reduction potential (ORP) (R = −0.67, p = 0.034), chemical oxygen demand mass (R = 0.78, p = 0.007), and biochemical oxygen demand mass (R = 0.78, p = 0.008), whereas it was not significantly correlated with water temperature (R = 0.26, p = 0.47) and dissolved oxygen (R = −0.59, p = 0.075) within the limited range: 30.6–31.7 °C and 0.03–0.34 mg-O2/L. The methane emission rates from septic tanks accumulating septage for >5 years were significantly higher than those at 0–5 years (p = 0.016). These results suggest that lower ORP and higher biodegradable carbon mass, in association with longer septage storage periods are key conditions for methane emissions. To the best of our knowledge, this is the first study to characterize GHG emissions from septic systems.

中文翻译:

黑水化粪池系统产生的温室气体排放量

化粪池系统可能是温室气体(GHG)的重要来源。本研究调查了黑水化粪池系统中的温室气体,该系统被广泛使用,特别是在中低收入国家。使用浮箱法对越南河内的十个黑水化粪池进行了调查。在化粪池的第一个隔间测得的平均甲烷和二氧化碳排放量(占总容量的65%)分别为11.92和20.24 g / cap / day,而一氧化二氮的排放可以忽略不计。甲烷排放速率与隔氧化还原电位(ORP)(R = -0.67,p = 0.034),化学需氧量(R = 0.78,p= 0.007)和生化需氧量(R = 0.78,p = 0.008),而与水温(R = 0.26,p = 0.47)和溶解氧(R = -0.59,p = 0.075)无关。在限制范围内:30.6–31.7°C和0.03–0.34 mg-O 2 / L。堆积超过5年的化粪池的甲烷排放率显着高于0-5年的甲烷排放率(p= 0.016)。这些结果表明,较低的ORP和较高的可生物降解碳质量,以及较长的分离存储时间是甲烷排放的关键条件。据我们所知,这是第一个鉴定化粪池系统温室气体排放特征的研究。
更新日期:2021-01-19
down
wechat
bug